1. GeoRaster Developer's Guide
  2. SDO_GEOR_RA Package Reference

12 SDO_GEOR_RA Package Reference

The SDO_GEOR_RA package contains subprograms (functions and procedures) for raster algebra and analytic operations related to GeoRaster. This chapter presents reference information, with one or more examples, for each subprogram.

12.1 SDO_GEOR_RA.classify

Format

SDO_GEOR_RA.classify(
     inGeoRaster   IN SDO_GEORASTER, 
     expression    IN VARCHAR2, 
     rangeArray    IN SDO_NUMBER_ARRAY, 
     valueArray    IN SDO_NUMBER_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.classify(
     inGeoRaster   IN SDO_GEORASTER,
     cropArea      IN SDO_NUMBER_ARRAY, 
     expression    IN VARCHAR2, 
     rangeArray    IN SDO_NUMBER_ARRAY, 
     valueArray    IN SDO_NUMBER_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.classify(
     inGeoRaster   IN SDO_GEORASTER, 
     cropArea      IN SDO_GEOMETRY, 
     expression    IN VARCHAR2, 
     rangeArray    IN SDO_NUMBER_ARRAY, 
     valueArray    IN SDO_NUMBER_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     polygonClip   IN VARCHAR2 DEFAULT 'FALSE', 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.classify(
     georArray     IN SDO_GEORASTER_ARRAY, 
     expression    IN VARCHAR2, 
     rangeArray    IN SDO_NUMBER_ARRAY, 
     valueArray    IN SDO_NUMBER_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.classify(
     georArray     IN SDO_GEORASTER_ARRAY, 
     cropArea      IN SDO_NUMBER_ARRAY, 
     expression    IN VARCHAR2, 
     rangeArray    IN SDO_NUMBER_ARRAY, 
     valueArray    IN SDO_NUMBER_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.classify(
     georArray     IN SDO_GEORASTER_ARRAY, 
     cropArea      IN SDO_GEOMETRY, 
     expression    IN VARCHAR2, 
     rangeArray    IN SDO_NUMBER_ARRAY, 
     valueArray    IN SDO_NUMBER_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     polygonClip   IN VARCHAR2 DEFAULT 'FALSE', 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.classify(
     inGeoRasters  IN SYS_REFCURSOR, 
     expression    IN VARCHAR2, 
     rangeArray    IN SDO_NUMBER_ARRAY, 
     valueArray    IN SDO_NUMBER_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.classify(
     inGeoRasters  IN SYS_REFCURSOR, 
     cropArea      IN SDO_NUMBER_ARRAY, 
     expression    IN VARCHAR2, 
     rangeArray    IN SDO_NUMBER_ARRAY, 
     valueArray    IN SDO_NUMBER_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.classify(
     inGeoRasters  IN SYS_REFCURSOR, 
     cropArea      IN SDO_GEOMETRY, 
     expression    IN VARCHAR2, 
     rangeArray    IN SDO_NUMBER_ARRAY, 
     valueArray    IN SDO_NUMBER_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     polygonClip   IN VARCHAR2 DEFAULT 'FALSE', 
     parallelParam IN VARCHAR2 DEFAULT NULL);

Description

Generates a new GeoRaster object after applying the specified classification operation on the input GeoRaster object or objects.

There are three formats for each of three input GeoRaster object or objects specification options (SDO_GEORASTER, SDO_GEORASTER_ARRAY, SYS_REEFCURSOR). Within each group of three, you can specify no crop area or a crop area of SDO_NUMBER_ARRAY or SDO_GEOMETRY; and for an SDO_GEOMETRY crop area, you can specify a polygon clip option.

Parameters

inGeoRaster

Input GeoRaster object.

georArray

An array of GeoRaster objects. The data type is SDO_GEOR_ARRAY, which is defined as VARRAY(10485760) OF SDO_GEORASTER.

inGeoRasters

Cursor (SYS_REFCURSOR type) for the input GeoRaster objects.

cropArea

Crop area definition. If the data type is SDO_GEOMETRY, the minimum bounding rectangle (MBR) of the geometry object is used as a rectangular crop area to generate the output GeoRaster object. If the parameter polygonClip is TRUE, then only cells within the crop area geometry are processed, and all cells outside the crop area geometry are set to zero (0). If the parameter polygonClip is FALSE, then all cells within the minimum bounding rectangle are processed.

If the data type is SDO_NUMBER_ARRAY, the parameter identifies the upper-left (row, column) and lower-right (row, column) coordinates of a rectangular window, and raster space is assumed.

expression

An arithmetic expression used to classify cell values. See the Usage Notes for more information about specifying this parameter.

rangeArray

A number array that defines ranges for classifying cell values. The array must contain at least one element.

valueArray

A number array that defines the target cell value for each range. The number of elements must be 1 greater than the elements in rangeArray (that is, its length must be rangeArray+1).

storageParam

A string specifying storage parameters, as explained in Storage Parameters.

outGeoRaster

Output GeoRaster object.

nodata

The string TRUE specifies that for any NODATA cells in an input GeoRaster object, the corresponding cells in the output GeoRaster object are to be set to the value specified for the nodataValue parameter. The string FALSE (the default) causes cells with NODATA values to be considered as regular data. NODATA values and value ranges are discussed in NODATA Values and Value Ranges.

nodataValue

The value used to set NODATA cells if the nodata parameter value is the string TRUE.

polygonClip

Ignored if cropArea is null. Otherwise, the string TRUE causes the cropArea geometry to be used to process the data; the string FALSE or a null value causes the minimum bounding rectangle (MBR) of thecropArea geometry to be used to process the data.

parallelParam

Specifies the degree of parallelism for the operation. If specified, must be in the form parallel=n, where n is greater than 1. The database optimizer uses the degree of parallelism specified by this parameter. If not specified, then by default there is no parallel processing. (For more information, see Parallel Processing in GeoRaster.)

Specifying parallelParam means that you cannot roll back the results of this procedure, as explained in the Usage Notes.

Usage Notes

This procedure generates a one-layer GeoRaster object based on the input GeoRaster object or objects and the expression parameter, which is an arithmetic expression string. For each cell in the output GeoRaster object, expression is evaluated against corresponding cell values in the input GeoRaster object, and the following algorithm is used to calculate cell values of the output GeoRaster object: 

if  (value of expression < rangeArray[0])
    cellValue=valueArray[0]
else if (value of expression >= rangeArray[n-1])
    cellValue=valueArray[n]
else if rangeArray[m-1] <= value of expression < rangeArray[m]
     cellValue=valueArray[m]

In the expression calculation:

  • Length of rangeArray is n

  • Length of valueArray is n+1

  • 0 < m < n-1

For more information, see Raster Algebra Language.

If you specify parallelParam, some execution units of the procedure run as autonomous transactions, which means that some changes are committed while the procedure is running and therefore you cannot roll back those changes. If you do not specify this parameter, you can roll back all changes.

Examples

The following example classifies cell values based on the cell values of the first layer.

DECLARE 
  geor       SDO_GEORASTER;
  geor1      SDO_GEORASTER;
  rangeArray SDO_NUMBER_ARRAY;
  valueArray SDO_NUMBER_ARRAY;
BEGIN
  rangeArray:=sdo_number_array(70,80,90,100,110,120,130,140,150,160,170,180);
  valueArray:=sdo_number_array(70,80,90,100,110,120,130,140,150,160,170,180,190);
  select georaster into geor from georaster_table where georid = 1;
  insert into georaster_table values (5, sdo_geor.init('rdt_1', 5)) returning georaster into geor1;
  sdo_geor_ra.classify(geor,'{0}',rangeArray,valueArray,null,geor1);
  update georaster_table set georaster = geor1 where georid = 5;
  commit;
END;
/

Parent topic: SDO_GEOR_RA Package Reference

12.2 SDO_GEOR_RA.diff

Format

SDO_GEOR_RA.diff(
     georaster1    IN SDO_GEORASTER, 
     georaster2    IN SDO_GEORASTER, 
     cropArea      IN SDO_NUMBER_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.diff(
     georaster1    IN SDO_GEORASTER, 
     georaster2    IN SDO_GEORASTER, 
     cropArea      IN SDO_GEOMETRY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     ploygonClip   IN VARCHAR2 DEFAULT 'FALSE',
     parallelParam IN VARCHAR2 DEFAULT NULL);

Description

Generates a new GeoRaster object by performing the diff operation (explained in the Usage Notes).

Parameters

georaster1

First input GeoRaster object.

georaster2

Second input GeoRaster object.

cropArea

Crop area definition. If the data type is SDO_GEOMETRY, the minimum bounding rectangle (MBR) of the geometry object is used as a rectangular crop area to generate the output GeoRaster object. If the parameter polygonClip is TRUE, then only cells within the crop area geometry are processed, and all cells outside the crop area geometry are set to zero (0). See also the Usage Notes for SDO_GEOR.reproject for SDO_SRID requirements.

If the data type is SDO_NUMBER_ARRAY, the parameter identifies the upper-left (row, column) and lower-right (row, column) coordinates of a rectangular window, and raster space is assumed.

storageParam

A string specifying storage parameters, as explained in Storage Parameters.

outGeoRaster

Output GeoRaster object.

nodata

The string TRUE specifies that for any NODATA cells in an input GeoRaster object, the corresponding cells in the output GeoRaster object are to be set to the value specified for the nodataValue parameter. The string FALSE (the default) causes cells with NODATA values to be considered as regular data. NODATA values and value ranges are discussed in NODATA Values and Value Ranges.

nodataValue

The value used to set NODATA cells if the nodata parameter value is the string TRUE.

polygonClip

Ignored if cropArea is null. Otherwise, the string TRUE causes the cropArea value to be used to crop the mosaicked data; the string FALSE or a null value causes the MBR of cropArea to be used to crop the output image.

parallelParam

Specifies the degree of parallelism for the operation. If specified, must be in the form parallel=n, where n is greater than 1. The database optimizer uses the degree of parallelism specified by this parameter. If not specified, then by default there is no parallel processing. (For more information, see Parallel Processing in GeoRaster.)

Specifying parallelParam means that you cannot roll back the results of this procedure, as explained in the Usage Notes.

Usage Notes

This procedure generates a new GeoRaster object by taking two input GeoRaster objects and applying the over operation: specifically, for each cell value in each layer, if the values in the two input objects are different, the value on the first input is output, but if the values in the two input objects are the same, the output is zero.

The two input GeoRaster objects must have same dimension size and same number of bands; otherwise, the ORA-13397 error is generated.

If you specify parallelParam, some execution units of the procedure run as autonomous transactions, which means that some changes are committed while the procedure is running and therefore you cannot roll back those changes. If you do not specify this parameter, you can roll back all changes.

For more information, see Logical Operations.

Examples

The following example performs the diff operation on the two input GeoRaster objects.

declare
  geor       MDSYS.SDO_GEORASTER;
  geor1      MDSYS.SDO_GEORASTER;
  geor2      MDSYS.SDO_GEORASTER;
  geom       mdsys.sdo_geometry;
begin
  select georaster into geor from georaster_table where georid = 100;
  select georaster into geor1 from georaster_table where georid = 101;
  select georaster into geor2 from georaster_table where georid = 102 for update;
  geom:=null;
  mdsys.sdo_geor_ra.diff(geor,geor1,geom,null,geor2);
  update georaster_table set georaster = geor2 where georid = 102;
end;
/

Parent topic: SDO_GEOR_RA Package Reference

12.3 SDO_GEOR_RA.findCells

Format

SDO_GEOR_AGGR.findCells(
     inGeoRaster   IN SDO_GEORASTER, 
     condition     IN VARCHAR2, 
     storageParam  IN VARCHAR2 
     outGeoRaster  OUT SDO_GEORASTER, 
     bgValues      IN SDO_NUMBER_ARRAY DEFAULT NULL, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_AGGR.findCells(
     inGeoRaster   IN SDO_GEORASTER, 
     cropArea      IN SDO_NUMBER_ARRAY, 
     condition     IN VARCHAR2, 
     storageParam  IN VARCHAR2 
     outGeoRaster  OUT SDO_GEORASTER, 
     bgValues      IN SDO_NUMBER_ARRAY DEFAULT NULL, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_AGGR.findCells(
     inGeoRaster   IN SDO_GEORASTER, 
     cropArea      IN SDO_GEOMETRY, 
     condition     IN VARCHAR2, 
     storageParam  IN VARCHAR2 
     outGeoRaster  OUT SDO_GEORASTER, 
     bgValues      IN SDO_NUMBER_ARRAY DEFAULT NULL, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     polygonClip   IN VARCHAR2 DEFAULT 'FALSE', 
     parallelParam IN VARCHAR2 DEFAULT NULL);

Description

Generates a new GeoRaster object based on the input GeoRaster object, but masking all cells that do not satisfy the condition parameter specification.

Parameters

inGeoRaster

Input GeoRaster object.

cropArea

Crop area definition. If the data type is SDO_GEOMETRY, the minimum bounding rectangle (MBR) of the geometry object is used as a rectangular crop area to generate the output GeoRaster object; see also the Usage Notes for SDO_GEOR.reproject for SDO_SRID requirements.. If the parameter polygonClip is TRUE, then only cells within the crop area geometry are processed, and all cells outside the crop area geometry are set to zero (0). If the parameter polygonClip is FALSE, then all cells within the minimum bounding rectangle are processed.

If the data type is SDO_NUMBER_ARRAY, the parameter identifies the upper-left (row, column) and lower-right (row, column) coordinates of a rectangular window, and raster space is assumed.

condition

An expression string used to filter out cells. (See the Usage Notes for more information.).

storageParam

A string specifying storage parameters, as explained in Storage Parameters.

outGeoRaster

Output GeoRaster object.

bgValues

Background values to represent values of cells in the empty raster blocks of the input GeoRaster object. The number of elements in the SDO_NUMBER_ARRAY object must be either one (same filling value used for all bands) or the band dimension size (a different filling value for each band, respectively). For example, SDO_NUMBER_ARRAY(1,5,10) fills the first band with 1, the second band with 5, and the third band with 10. The default bgValues are zero (0).

The filling values must be valid cell values as specified by the target cell depth background values for filling sparse data.

nodata

The string TRUE specifies to keep the original values for any NODATA cells in the GeoRaster object. The string FALSE (the default) causes cells with NODATA values to be considered as regular data. NODATA values and value ranges are discussed in NODATA Values and Value Ranges.

polygonClip

Ignored if cropArea is null. Otherwise, the string TRUE causes the cropArea geometry to be used to process the data; the string FALSE or a null value causes the minimum bounding rectangle (MBR) of thecropArea geometry to be used to process the data.

parallelParam

Specifies the degree of parallelism for the operation. If specified, must be in the form parallel=n, where n is greater than 1. The database optimizer uses the degree of parallelism specified by this parameter. If not specified, then by default there is no parallel processing. (For more information, see Parallel Processing in GeoRaster.)

Specifying parallelParam means that you cannot roll back the results of this procedure, as explained in the Usage Notes.

Usage Notes

This procedure generates a new GeoRaster object based on the input GeoRaster object and the condition parameter, which is booleanExpr, a Boolean expression string. For each cell in the output GeoRaster object, condition is evaluated against corresponding cell values in the input GeoRaster object. If condition is true for a cell, the original cell value is kept in the output GeoRaster object; otherwise, bgValues are filled for the cell in the output GeoRaster object

For more information, see Raster Algebra Language.

If you specify parallelParam, some execution units of the procedure run as autonomous transactions, which means that some changes are committed while the procedure is running and therefore you cannot roll back those changes. If you do not specify this parameter, you can roll back all changes.

Examples

The following example changes cell values to default background values 0, if cell value of the second layer is less than or equal to 200.

DECLARE
  geor  SDO_GEORASTER;
  geor1 SDO_GEORASTER;
BEGIN
  select georaster into geor from georaster_table where georid = 1;
  insert into georaster_table values (5, sdo_geor.init('rdt_1', 5)) returning georaster into geor1;
  sdo_geor_ra.findcells(geor, '{1}>200',null,geor1);
  update georaster_table set georaster = geor1 where georid = 5;
  commit;
END;
/

The following example uses a geometry object (geom) as the input cropArea. 

DECLARE
  geor       SDO_GEORASTER;
  geor0      SDO_GEORASTER;
  geor1      SDO_GEORASTER;
  geom       SDO_GEOMETRY;
BEGIN
  geom:= sdo_geometry(2003,82394, NULL,
                         sdo_elem_info_array(1, 1003, 1),
                         sdo_ordinate_array(21783.775, 1008687.9,
                                           18783.775, 966687.905,
                                           63783.775, 966687.905,
                                           81783.775, 990687.905,
                                           21783.775, 1008687.9));
  select georaster into geor from georaster_table where georid = 100;
  select georaster into geor1 from georaster_table where georid = 101 for update;
  sdo_geor_ra.findcells(geor,geom,'({1}=42)','blocking=true, blocksize=(256,256,3)',geor1,null,'false');
  update georaster_table set georaster = geor1 where georid = 101;
END;
/

Parent topic: SDO_GEOR_RA Package Reference

12.4 SDO_GEOR_RA.isOverlap

Format

SDO_GEOR.isOverlap(
     georaster1 IN SDO_GEORASTER, 
     georaster2 IN SDO_GEORASTER, 
     tolerance  IN NUMBER DEFAULT 0.5 
     ) RETURN VARCHAR2;

or

SDO_GEOR_RA.isOverlap(
     georArray IN SDO_GEORASTER_ARRAY, 
     tolerance IN NUMBER DEFAULT 0.5 
     ) RETURN VARCHAR2;

or

SDO_GEOR_RA.isOverlap(
     geor_cur  IN SYS_REFCURSOR, 
     tolerance IN NUMBER DEFAULT 0.5 
     ) RETURN VARCHAR2;

Description

Returns the string TRUE if two or more GeoRaster objects overlap, or FALSE if two or more GeoRaster objects do not overlap. (See the Usage Notes for the logic used to determine of two GeoRaster objects, whether georeferenced or not, overlap.)

Parameters

georaster1

GeoRaster object.

georaster2

GeoRaster object.

georArray

An array of GeoRaster objects. The data type is SDO_GEOR_ARRAY, which is defined as VARRAY(10485760) OF SDO_GEORASTER.

geor_cur

Cursor (SYS_REFCURSOR type) for the input GeoRaster objects.

tolerance

Tolerance value used to determine if two cells in the cell space overlap in the model space. The value should be between 0 and 1, and the unit is cell. For example, 0.5 (the default) means one-half cell, namely, that two cells overlap if the distance between them in 0.5 cell or less.

Usage Notes

The GeoRaster objects being compared for overlap must be either all georeferenced or all non-georeferenced.

The following logic is applied to determine if two GeoRaster objects overlap:

  1. If the row or column dimension size of two GeoRaster objects is different, then return 'FALSE'. Otherwise, continue to the next step.

  2. Check if both GeoRaster objects are georeferenced.

    1. If one is georeferenced and the other one is not, then return 'FALSE'.

    2. If both are non-georeferenced, and if the ultCoordinate of both GeoRaster objects is the same, then return 'TRUE'; else, return 'FALSE'.

    3. If both are georeferenced, go to the next step.

  3. Check the pType, nVars, order, and nCoefficients values (explained in Functional Fitting Georeferencing Model) of the p, q, r, and s polynomials. If any are different, then return 'FALSE'; else, go to the next step.

  4. Calculate the upper-left, upper-right, lower-left, and lower-right four points from cell space to model space. If the distance of corresponding points of the two GeoRaster objects is within the tolerance value (converted from cell space to model space), then return 'TRUE'; else, return 'FALSE'.

The raster algebra functions of GeoRaster require the raster layers from different GeoRaster objects have the same size and completely overlap each other. Before you apply raster algebra operations over two or more GeoRaster objects or perform other operations, you can use the SDO_GEOR_RA.isOverlap function to determine if the GeoRaster objects are of the same size and cover the same ground area.

Examples

The following examples check if two GeoRaster objects overlap. (They use two different formats of the function.)

DECLARE 
  geor       MDSYS.SDO_GEORASTER;
  geor1      MDSYS.SDO_GEORASTER;
BEGIN
 
  SELECT georaster INTO geor FROM georaster_table WHERE georid = 1;
  SELECT georaster INTO geor1 FROM georaster_table WHERE georid = 30;
  dbms_output.put_line(sdo_geor_ra.isOverlap(geor,geor1,0.5));
END;
/
 
DECLARE 
  mycursor  sys_refcursor;
BEGIN
  OPEN mycursor FOR
    SELECT georaster FROM georaster_table WHERE georid = 1 or georid=30;
  dbms_output.put_line(sdo_geor_ra.isOverlap(mycursor,0.5));
END;
/

Parent topic: SDO_GEOR_RA Package Reference

12.5 SDO_GEOR_RA.over

Format

SDO_GEOR_RA.over(
     georaster1    IN SDO_GEORASTER, 
     georaster2    IN SDO_GEORASTER, 
     cropArea      IN SDO_NUMBER_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.over(
     georaster1    IN SDO_GEORASTER, 
     georaster2    IN SDO_GEORASTER, 
     cropArea      IN SDO_GEOMETRY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     ploygonClip   IN VARCHAR2 DEFAULT 'FALSE',
     parallelParam IN VARCHAR2 DEFAULT NULL);

Description

Generates a new GeoRaster object by performing the over operation (explained in the Usage Notes).

Parameters

georaster1

First input GeoRaster object.

georaster2

Second input GeoRaster object.

cropArea

Crop area definition. If the data type is SDO_GEOMETRY, the minimum bounding rectangle (MBR) of the geometry object is used as a rectangular crop area to generate the output GeoRaster object. If the parameter polygonClip is TRUE, then only cells within the crop area geometry are processed, and all cells outside the crop area geometry are set to zero (0). See also the Usage Notes for SDO_GEOR.reproject for SDO_SRID requirements.

If the data type is SDO_NUMBER_ARRAY, the parameter identifies the upper-left (row, column) and lower-right (row, column) coordinates of a rectangular window, and raster space is assumed.

storageParam

A string specifying storage parameters, as explained in Storage Parameters.

outGeoRaster

Output GeoRaster object.

nodata

The string TRUE specifies that for any NODATA cells in an input GeoRaster object, the corresponding cells in the output GeoRaster object are to be set to the value specified for the nodataValue parameter. The string FALSE (the default) causes cells with NODATA values to be considered as regular data. NODATA values and value ranges are discussed in NODATA Values and Value Ranges.

nodataValue

The value used to set NODATA cells if the nodata parameter value is the string TRUE.

polygonClip

Ignored if cropArea is null. Otherwise, the string TRUE causes the cropArea value to be used to crop the mosaicked data; the string FALSE or a null value causes the MBR of cropArea to be used to crop the output image.

parallelParam

Specifies the degree of parallelism for the operation. If specified, must be in the form parallel=n, where n is greater than 1. The database optimizer uses the degree of parallelism specified by this parameter. If not specified, then by default there is no parallel processing. (For more information, see Parallel Processing in GeoRaster.)

Specifying parallelParam means that you cannot roll back the results of this procedure, as explained in the Usage Notes.

Usage Notes

This procedure generates a new GeoRaster object by taking two input GeoRaster objects and applying the over operation: specifically, each cell in each layer in the output GeoRaster object will contain the value from the corresponding cell in first input GeoRaster object if that value is not zero; otherwise, it will contain the value of the corresponding cell in the second GeoRaster object.

If you specify parallelParam, some execution units of the procedure run as autonomous transactions, which means that some changes are committed while the procedure is running and therefore you cannot roll back those changes. If you do not specify this parameter, you can roll back all changes.

For more information, see Logical Operations.

Examples

The following example performs the over operation on the two input GeoRaster objects.

declare
  geor       MDSYS.SDO_GEORASTER;
  geor1      MDSYS.SDO_GEORASTER;
  geor2      MDSYS.SDO_GEORASTER;
  geom       mdsys.sdo_geometry;
begin
  select georaster into geor from georaster_table where georid = 100;
  select georaster into geor1 from georaster_table where georid = 101;
  select georaster into geor2 from georaster_table where georid = 102 for update;
  geom:=null;
  mdsys.sdo_geor_ra.over(geor,geor1,geom,null,geor2);
  update georaster_table set georaster = geor2 where georid = 102;
end;
/

Parent topic: SDO_GEOR_RA Package Reference

12.6 SDO_GEOR_RA.rasterMathOp

Format

SDO_GEOR_RA.rasterMathOp(
     inGeoRaster   IN SDO_GEORASTER, 
     operation     IN SDO_STRING2_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

SDO_GEOR_RA.rasterMathOp(
     inGeoRaster   IN SDO_GEORASTER, 
     cropArea      IN SDO_NUMBER_ARRAY, 
     operation     IN SDO_STRING2_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

SDO_GEOR_RA.rasterMathOp(
     inGeoRaster   IN SDO_GEORASTER, 
     cropArea      IN SDO_GEOMETRY, 
     operation     IN SDO_STRING2_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     polygonClip   IN VARCHAR2 DEFAULT 'FALSE',
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.rasterMathOp(
     georArray     IN SDO_GEORASTER_ARRAY, 
     operation     IN SDO_STRING2_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

SDO_GEOR_RA.rasterMathOp(
     georArray     IN SDO_GEORASTER_ARRAY, 
     cropArea      IN SDO_NUMBER_ARRAY, 
     operation     IN SDO_STRING2_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

SDO_GEOR_RA.rasterMathOp(
     georArray     IN SDO_GEORASTER_ARRAY, 
     cropArea      IN SDO_GEOMETRY, 
     operation     IN SDO_STRING2_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     polygonClip   IN VARCHAR2 DEFAULT 'FALSE',
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.rasterMathOp(
     inGeoRasters  IN SYS_REFCURSOR, 
     operation     IN SDO_STRING2_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

SDO_GEOR_RA.rasterMathOp(
     inGeoRasters  IN SYS_REFCURSOR, 
     cropArea      IN SDO_NUMBER_ARRAY, 
     operation     IN SDO_STRING2_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

SDO_GEOR_RA.rasterMathOp(
     inGeoRasters  IN SYS_REFCURSOR, 
     cropArea      IN SDO_GEOMETRY, 
     operation     IN SDO_STRING2_ARRAY, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     polygonClip   IN VARCHAR2 DEFAULT 'FALSE',
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.rasterMathOp(
     georaster0    IN SDO_GEORASTER, 
     georaster1    IN SDO_GEORASTER, 
     constant      IN NUMBER, 
     operator      IN PLS_INTEGER, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     bgValues      IN SDO_NUMBER_ARRAY DEFAULT NULL, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

SDO_GEOR_RA.rasterMathOp(
     georaster0    IN SDO_GEORASTER, 
     georaster1    IN SDO_GEORASTER, 
     cropArea      IN SDO_NUMBER_ARRAY, 
     constant      IN NUMBER, 
     operator      IN PLS_INTEGER, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     bgValues      IN SDO_NUMBER_ARRAY DEFAULT NULL, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

SDO_GEOR_RA.rasterMathOp(
     georaster0    IN SDO_GEORASTER, 
     georaster1    IN SDO_GEORASTER, 
     cropArea      IN SDO_GHEOMETRY, 
     constant      IN NUMBER, 
     operator      IN PLS_INTEGER, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     bgValues      IN SDO_NUMBER_ARRAY DEFAULT NULL, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     polygonClip   IN VARCHAR2 DEFAULT 'FALSE',
     parallelParam IN VARCHAR2 DEFAULT NULL);

Description

Performs a raster mathematical operation on one or more GeoRaster objects.

Parameters

inGeoRaster

Input GeoRaster object.

georArray

An array of GeoRaster objects. The data type is SDO_GEOR_ARRAY, which is defined as VARRAY(10485760) OF SDO_GEORASTER.

inGeoRasters

Cursor (SYS_REFCURSOR type) for the input GeoRaster objects.

georaster0

The left operand.

georaster1

The right operand.

cropArea

Crop area definition. If the data type is SDO_GEOMETRY, the minimum bounding rectangle (MBR) of the geometry object is used as a rectangular crop area to generate the output GeoRaster object. If the parameter polygonClip is TRUE, then only cells within the crop area geometry are processed, and all cells outside the crop area geometry are set to zero (0). See also the Usage Notes for SDO_GEOR.reproject for SDO_SRID requirements.

If the data type is SDO_NUMBER_ARRAY, the parameter identifies the upper-left (row, column) and lower-right (row, column) coordinates of a rectangular window, and raster space is assumed.

operation

An array of arithmeticExpr expression strings used to calculate raster cell values in the output GeoRaster object. Each element of the array corresponds to a layer in the output GeoRaster object. The data type is SDO_STRING2_ARRAY, which is defined as VARRAY(2147483647) OF VARCHAR2(4096).

The syntax for the arithmeticExpr expressions is explained in Raster Algebra Language.

constant

Constant value for some operators (see the operator parameter), such as addConst and divConstant.

operator

One of the following math operators, which are defined in the SDO_GEOR_RA package:

OPERATOR_ABSOLUTE      
OPERATOR_ADD               
OPERATOR_ADDCONST  
OPERATOR_DIVIDE           
OPERATOR_DIVIDECONST
OPERATOR_EXP
OPERATOR_INVERT            
OPERATOR_LOG             
OPERATOR_MULTIPLY         
OPERATOR_MULTIPLYCONST 
OPERATOR_SUBTRACT   
OPERATOR_SUBTRACTCONST

For the definitions of these operators, see the Usage Notes.

storageParam

A string specifying storage parameters, as explained in Storage Parameters.

outGeoRaster

Output GeoRaster object.

bgValues

Background values to represent values of cells in the empty raster blocks of the input GeoRaster object. The number of elements in the SDO_NUMBER_ARRAY object must be either one (same filling value used for all bands) or the band dimension size (a different filling value for each band, respectively). For example, SDO_NUMBER_ARRAY(1,5,10) fills the first band with 1, the second band with 5, and the third band with 10. The default bgValues are zero (0).

The filling values must be valid cell values as specified by the target cell depth background values for filling sparse data.

nodata

The string TRUE specifies that for any NODATA cells in an input GeoRaster object, the corresponding cells in the output GeoRaster object are to be set to the value specified for the nodataValue parameter. The string FALSE (the default) causes cells with NODATA values to be considered as regular data. NODATA values and value ranges are discussed in NODATA Values and Value Ranges.

nodataValue

The value used to set NODATA cells if the nodata parameter value is the string TRUE.

polygonClip

Ignored if cropArea is null. Otherwise, the string TRUE causes the cropArea value to be used to crop the mosaicked data; the string FALSE or a null value causes the MBR of cropArea to be used to crop the output image.

parallelParam

Specifies the degree of parallelism for the operation. If specified, must be in the form parallel=n, where n is greater than 1. The database optimizer uses the degree of parallelism specified by this parameter. If not specified, then by default there is no parallel processing. (For more information, see Parallel Processing in GeoRaster.)

Specifying parallelParam means that you cannot roll back the results of this procedure, as explained in the Usage Notes.

Usage Notes

This procedure has 12 formats, which can be considered as 4 groups of 3 formats each:

  • Operation on a single GeoRaster object

  • Operation on an array of GeoRaster objects

  • Operation on GeoRaster objects specified by a cursor (SYS_REFCURSOR type)

  • Operation on all corresponding cells of each layer or one or two GeoRaster objjects

Within each group, the options include specifying a crop eras of type SDO_NUMBER_ARRAY or SDO_GEOMETRY, and for an SDO_GEOMETRY crop area, whether to use the crop area’s geometry object or the MBR of that object.

The first three groups of formats are used to generate a new GeoRaster object from layers of one or more input GeoRaster objects based on the operation parameter. For example, the following example generates a new GeoRaster object that has three layers, and each layer's value is the cell value of the input GeoRaster object minus 10: 

sdo_geor_ra.rasterMathOp(geor,SDO_STRING2_ARRAY('{0,0}-10','{0,1}-10','{0,2}-10'),null,geor1);

The fourth group of formats applies a mathematical operation on all corresponding cells of each layer of input GeoRaster objects, and generates a new GeoRaster object with the same dimension size as the first input GeoRaster object (geoRaster0). The two input GeoRaster objects must have same row/column/band dimension size.

For the fourth group of formats, all pyramids are removed in the resulting GeoRaster object, but masks of the first input GeoRaster object are kept in the resulting GeoRaster object.

For the operator parameter, the operators have the following definitions: 

OPERATOR_ABSOLUTE  : 
 if (src[x][y][b] < 0) {
     dst[x][y][b] = -src[x][y][b];
 } else {
     dst[x][y][b] =  src[x][y][b];
 }

OPERATOR_ADD               
   dst[x][y][b]=src1[x][y][b]+src2[x][y][b]
OPERATOR_ADDCONST  
   dst[x][y][b]=src[x][y][b] +constant   --constant is the third parameter 
 
OPERATOR_DIVIDE           
   dst[x][y][b]=src1[x][y][b]/src2[x][y][b]
 
OPERATOR_DIVIDECONST
   dst[x][y][b]=src[x][y][b]/constant   --constant is the third parameter 
 
OPERATOR_EXP
   dst[x][y][b]=exp(src[x][y][b])
 
OPERATOR_INVERT        :
   Inverts the cell values: dst[x][y][b]=-src[x][y][b] 

OPERATOR_LOG           :  
   dst[x][y][b]=log(src[x][y][b])
 
OPERATOR_MULTIPLY         
   dst[x][y][b]=src1[x][y][b]*src2[x][y][b]
 
OPERATOR_MULTIPLYCONST 
   dst[x][y][b]=src[x][y][b]*constant   --constant is the third parameter 
 
OPERATOR_SUBTRACT   
   dst[x][y][b]=src1[x][y][b]-src2[x][y][b]
 
OPERATOR_SUBTRACTCONST
   dst[x][y][b]=src[x][y][b]-constant   --constant is the third parameter

For more information about the raster algebra language, see Raster Algebra Language.

If you specify parallelParam, some execution units of the procedure run as autonomous transactions, which means that some changes are committed while the procedure is running and therefore you cannot roll back those changes. If you do not specify this parameter, you can roll back all changes.

Examples

The following example adds the constant 10 to all cell values of the input GeoRaster object.

DECLARE 
  geor       SDO_GEORASTER;
  geor1      SDO_GEORASTER;
BEGIN
 
  select georaster into geor from georaster_table where georid = 1;
  insert into georaster_table values (5, sdo_geor.init('rdt_1', 5)) returning georaster into geor1;
  sdo_geor_ra.rasterMathOp(geor,null,10,sdo_geor_ra.OPERATOR_ADDCONST,null,geor1);
  update georaster_table set georaster = geor1 where georid = 5;
  commit;
END;
/

The following example generates a new three-layer GeoRaster object from three layers of the input GeoRaster object, and each cell value in the new GeoRaster object is the value of the corresponding "old" cell divided by 2.

DECLARE 
  geor       SDO_GEORASTER;
  geor1      SDO_GEORASTER;
  geo_array  SDO_GEORASTER_ARRAY;
BEGIN
  select georaster into geor from georaster_table where georid = 2;
  insert into georaster_table values (20, sdo_geor.init('rdt_1', 20)) returning georaster into geor1;
  geo_array:=SDO_GEORASTER_ARRAY(geor);
  sdo_geor_ra.rasterMathOp(geo_array,SDO_STRING2_ARRAY('{0,0}/2','{0,1}/2','{0,2}/2'),null,geor1);
  update georaster_table set georaster = geor1 where georid = 20;
  commit;
END;
/

The following example performs a raster math operation with a geometry object as the crop area.

DECLARE
  geor       SDO_GEORASTER;
  geor1      SDO_GEORASTER;
  geom       SDO_GEOMETRY;
  geo_array  SDO_GEORASTER_ARRAY;
BEGIN
  geom:= sdo_geometry(2003,82394, NULL,
                         sdo_elem_info_array(1, 1003, 1),
                         sdo_ordinate_array(21783.775, 1008687.9,
                                                 18783.775, 966687.905,
                                                 63783.775, 966687.905,
                                                 81783.775, 990687.905,
                                                 21783.775, 1008687.9));
  select georaster into geor from georaster_table where georid = 100;
  select georaster into geor1 from georaster_table where georid = 101 for update;
  geo_array:=SDO_GEORASTER_ARRAY(geor);
  mdsys.sdo_geor_ra.rasterMathOp(geo_array,geom,SDO_STRING2_ARRAY('{0,0}/2','{0,1}/2','{0,2}/2'),null,geor1);
  update georaster_table set georaster = geor1 where georid = 101;
  commit;
END;
/

Parent topic: SDO_GEOR_RA Package Reference

12.7 SDO_GEOR_RA.rasterUpdate

Format

SDO_GEOR_RA.rasterUpdate(
     geoRaster     IN OUT SDO_GEORASTER, 
     pyramidLevel  IN NUMBER, 
     conditions    IN SDO_STRING2_ARRAY, 
     vals          IN SDO_STRING2_ARRAYSET, 
     bgValues      IN SDO_NUMBER_ARRAY DEFAULT NULL, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.rasterUpdate(
     geoRaster     IN OUT SDO_GEORASTER, 
     pyramidLevel  IN NUMBER, 
     targetArea    IN SDO_NUMBER_ARRAY, 
     conditions    IN SDO_STRING2_ARRAY, 
     vals          IN SDO_STRING2_ARRAYSET, 
     bgValues      IN SDO_NUMBER_ARRAY DEFAULT NULL, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.rasterUpdate(
     geoRaster     IN OUT SDO_GEORASTER, 
     pyramidLevel  IN NUMBER, 
     targetArea    IN SDO_GEOMETRY, 
     conditions    IN SDO_STRING2_ARRAY, 
     vals          IN SDO_STRING2_ARRAYSET, 
     bgValues      IN SDO_NUMBER_ARRAY DEFAULT NULL, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     polygonClip   IN VARCHAR2 DEFAULT 'FALSE',
     parallelParam IN VARCHAR2 DEFAULT NULL);

Description

Updates all cells for which the conditions specification is true, using values calculated from the vals specification.

Parameters

geoRaster

GeoRaster object that is used for input and for output (updating based on specified conditions).

pyramidLevel

Pyramid level to be updated. If this parameter is null, all pyramid levels are updated.

targetArea

Target area definition. If the data type is SDO_GEOMETRY, then if the parameter polygonClip is TRUE, only cells within the target area geometry are updated, and all cells outside the target area geometry keep original values; but if the parameter polygonClip is FALSE, all cells in the MBR of the target area geometry are updated.

If the data type is SDO_NUMBER_ARRAY, the parameter identifies the upper-left (row, column) and lower-right (row, column) coordinates of a rectangular window, and raster space is assumed.

conditions

An array of booleanExpr expression strings used to select cells. (See the Usage Notes for more information.) The data type is SDO_STRING2_ARRAY, which is defined as VARRAY(2147483647) OF VARCHAR2(4096).

vals

An array or arrays of arithmeticExpr expressions, with the outer array corresponding to each condition and the inner array corresponding to each layer. The data type is SDO_STRING2_ARRAYSET, which is defined as VARRAY(2147483647) OF SDO_STRING2_ARRAY.

bgValues

Background values to represent values of cells in the empty raster blocks of the input GeoRaster object. The number of elements in the SDO_NUMBER_ARRAY object must be either one (same filling value used for all bands) or the band dimension size (a different filling value for each band, respectively). For example, SDO_NUMBER_ARRAY(1,5,10) fills the first band with 1, the second band with 5, and the third band with 10. The default bgValues are zero (0).

The filling values must be valid cell values as specified by the target cell depth background values for filling sparse data.

nodata

The string TRUE specifies that any NODATA cells in the GeoRaster object are not to be updated. The string FALSE (the default) causes cells with NODATA values to be considered as regular cells and thus eligible for updating. NODATA values and value ranges are discussed in NODATA Values and Value Ranges.

polygonClip

Ignored if targetArea is null. Otherwise, the string TRUE causes the targetArea geometry value to be used to update raster cell values; the string FALSE or a null value causes the MBR of targetArea geometry to be used to update raster cell values.

parallelParam

Specifies the degree of parallelism for the operation. If specified, must be in the form parallel=n, where n is greater than 1. The database optimizer uses the degree of parallelism specified by this parameter. If not specified, then by default there is no parallel processing. (For more information, see Parallel Processing in GeoRaster.)

Specifying parallelParam means that you cannot roll back the results of this procedure, as explained in the Usage Notes.

Usage Notes

Because this procedure overwrites data in the input GeoRaster object, you should make a copy of the original GeoRaster object and use this procedure on the copied object. After you are satisfied with the result of this procedure, you can discard the original GeoRaster object if you wish.

This procedure selects cells from the specified GeoRaster object based on booleanExpr strings specified in the conditions parameter, and updates corresponding cell values by calculating arithmeticExpr expression strings specified in the vals parameter. For example, if: 

conditions = SDO_STRING2_ARRAY('{0}=48','{0}=108')
vals = SDO_STRING2_ARRAYSET(SDO_STRING2_ARRAY('123','54','89'),SDO_STRING2_ARRAY('98','56','123'))

Then:

  • For all cells whose first layer value equals 48, their first, second, and third layer values are set to 123,54,89, respectively.

  • For all cells whose first layer value equals 108, their first, second, and third layer values are set to 98,56,123, respectively.

For more information, see Raster Algebra Language.

If you specify parallelParam, some execution units of the procedure run as autonomous transactions, which means that some changes are committed while the procedure is running and therefore you cannot roll back those changes. If you do not specify this parameter, you can roll back all changes.

Examples

The following example updates all cells for which the conditions specification is true, using values calculated from the vals specification. 

DECLARE 
  geor SDO_GEORASTER;
BEGIN
  select georaster into geor from georaster_table where georid = 1;
  sdo_geor_ra.rasterUpdate(geor,0,SDO_STRING2_ARRAY('(abs({0}-{1})=48)&({2}-{1}=-101)','2*{0}-{1}/3=108'),SDO_STRING2_ARRAYSET(SDO_STRING2_ARRAY('123','54','89'),SDO_STRING2_ARRAY('98','56','123')));
END;
/

Parent topic: SDO_GEOR_RA Package Reference

12.8 SDO_GEOR_RA.stack

Format

SDO_GEOR_RA.stack(
     georArray     IN SDO_GEORASTER_ARRAY, 
     cropArea      IN SDO_NUMBER_ARRAY, 
     layerList     IN SDO_NUMBER_ARRAY, 
     method        IN VARCHARs, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     parallelParam IN VARCHAR2 DEFAULT NULL);

or

SDO_GEOR_RA.stack(
     georArray     IN SDO_GEORASTER_ARRAY, 
     cropArea      IN SDO_GEOMETRY, 
     layerList     IN SDO_NUMBER_ARRAY, 
     method        IN VARCHARs, 
     storageParam  IN VARCHAR2, 
     outGeoRaster  IN OUT SDO_GEORASTER, 
     nodata        IN VARCHAR2 DEFAULT 'FALSE', 
     nodataValue   IN NUMBER DEFAULT 0, 
     polygonClip   IN VARCHAR2 DEFAULT 'FALSE', 
     parallelParam IN VARCHAR2 DEFAULT NULL);

Description

Generates a single-layer GeoRaster object whose cell values are a local statistics value of a list of layers of the input GeoRaster array. The input layers are specified by the layerList parameter, and the statistics method is specified by the method parameter.

Parameters

georArray

An array of GeoRaster objects. The data type is SDO_GEOR_ARRAY, which is defined as VARRAY(10485760) OF SDO_GEORASTER.

cropArea

Crop area definition. If the SDO_GEOMETRY object has a non-null SRID, the source GeoRaster objects must be georeferenced; otherwise, the source GeoRaster objects can be georeferenced or non-georeferenced. If polygonClip is FALSE, the MBR of the cropArea is used to crop the data. If polygonClip is TRUE, the geometry of the cropArea is used to crop the data.

If the data type is SDO_NUMBER_ARRAY, the parameter identifies the upper-left (row, column) and lower-right (row, column) coordinates of a rectangular window, and raster space is assumed.

layerList

A number array to specify which bands of the input GeoRaster objects are used to compute statistics value for output. For example, if georArray specifies three GeoRaster objects geor1,geor2,geor3, which have 2,3,4 bands respectively, a layer list {0,3,7} is used to specify three bands as follows:

  • The first band of the first GeoRaster object geor1

  • The second band of the second GeoRaster object geor2

  • The third band of the third GeoRaster object geor3

method

A string to specify what local statistics value should be returned. It should be one of the following values: max, min, median, mean, std, sum, minority, majority, diversity.

storageParam

A string specifying storage parameters, as explained in Storage Parameters.

outGeoRaster

Output GeoRaster object.

nodata

The string TRUE specifies that for any NODATA cells in an input GeoRaster object, the corresponding cells in the output GeoRaster object are to be set to the value specified for the nodataValue parameter. The string FALSE (the default) causes cells with NODATA values to be considered as regular data. NODATA values and value ranges are discussed in NODATA Values and Value Ranges.

nodataValue

The value used to set NODATA cells if the nodata parameter value is the string TRUE.

parallelParam

Specifies the degree of parallelism for the operation. If specified, must be in the form parallel=n, where n is greater than 1. The database optimizer uses the degree of parallelism specified by this parameter. If not specified, then by default there is no parallel processing. (For more information, see Parallel Processing in GeoRaster.)

Specifying parallelParam means that you cannot roll back the results of this procedure, as explained in the Usage Notes.

Usage Notes

All of the input GeoRaster objects must have same dimension size; otherwise, the ORA-13397 error is generated.

If you specify parallelParam, some execution units of the procedure run as autonomous transactions, which means that some changes are committed while the procedure is running and therefore you cannot roll back those changes. If you do not specify this parameter, you can roll back all changes.

Examples

The following example performs the stack operation on two input GeoRaster objects.

DECLARE
  geor       MDSYS.SDO_GEORASTER;
  geor1      MDSYS.SDO_GEORASTER;
  geor2      MDSYS.SDO_GEORASTER;
  geom       mdsys.sdo_geometry;
BEGIN
  geom:= sdo_geometry(2003,82394, NULL,
               sdo_elem_info_array(1, 1003, 1),
               sdo_ordinate_array(20283.775, 1011087.9,
                                  18783.775, 1008687.9,
                                  21783.775, 1008687.9,
                                  22683.775+0.001, 1009587.9+0.001,
                                  20283.775, 1011087.9));
  select georaster into geor from georaster_table where georid = 100;
  select georaster into geor2 from georaster_table where georid = 102;
  select georaster into geor1 from georaster_table where georid = 101 for update;
  mdsys.sdo_geor_ra.stack(SDO_GEORASTER_ARRAY(geor,geor2),geom,SDO_NUMBER_ARRAY(3,5),'max',null,geor1,'false',0,'TRUE');
  update georaster_table set georaster = geor1 where georid = 101;
END;
/

Parent topic: SDO_GEOR_RA Package Reference