SDO_GEOR_RA.over
Format
SDO_GEOR_RA.over(
geor IN SDO_GEORASTER,
geor1 IN SDO_GEORASTER,
cropArea IN SDO_NUMBER_ARRAY,
storageParam IN VARCHAR2 DEFAULT NULL,
outGeoRaster IN OUT SDO_GEORASTER,
nodata IN VARCHAR2 DEFAULT 'FALSE',
nodataValue IN NUMBER DEFAULT 0,
parallelParam IN VARCHAR2 DEFAULT NULL);SDO_GEOR_RA.over(
geor IN SDO_GEORASTER,
geor1 IN SDO_GEORASTER,
cropArea IN SDO_GEOMETRY,
storageParam IN VARCHAR2 DEFAULT NULL,
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);or
SDO_GEOR_RA.over(
geor IN SDO_GEORASTER,
geor1 IN SDO_GEORASTER,
cropArea IN SDO_GEOMETRY,
storageParam IN VARCHAR2 DEFAULT NULL,
rasterBlob IN OUT BLOB,
outArea OUT SDO_GEOMETRY,
outWindow OUT SDO_NUMBER_ARRAY,
nodata IN VARCHAR2 DEFAULT 'FALSE',
nodataValue IN NUMBER default 0;SDO_GEOR_RA.over(
geor IN SDO_GEORASTER,
geor1 IN SDO_GEORASTER,
cropArea IN SDO_GEOMETRY,
storageParam IN VARCHAR2 DEFAULT NULL,
rasterBlob IN OUT BLOB,
outArea OUT SDO_GEOMETRY,
outWindow OUT SDO_NUMBER_ARRAY,
nodata IN VARCHAR2 DEFAULT 'FALSE',
nodataValue IN NUMBER default 0,
polygonClip IN VARCHAR2 DEFAULT 'FALSE');Description
Generates a new raster, either in a GeoRaster object or in a single BLOB, by performing the over operation (explained in the Usage Notes).
Parameters
geor
First input GeoRaster object.
geor1
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.
rasterBlob
BLOB to hold the output of the processing result. It must exist or have been initialized before the operation.
outArea
An SDO_GEOMETRY object containing the MBR (minimum bounding rectangle) in the model coordinate system of the resulting object.
outWindow
An SDO_NUMBER_ARRAY object identifying the coordinates of the upper-left and lower-right corners of the output window in the cell space.
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 raster, either in a GeoRaster object or in a single BLOB, by taking two input GeoRaster objects and applying the over operation: specifically, each cell in each layer in the output raster 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. The output is in a GeoRaster object.
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;
/The following example performs the over operation on the two input GeoRaster objects. The output is in a BLOB.
DECLARE
geor SDO_GEORASTER;
geor1 SDO_GEORASTER;
out_lob BLOB;
outArea sdo_geometry;
outWindow sdo_number_array;
geom sdo_geometry;
BEGIN
select georaster into geor from georaster_table where georid = 100;
select georaster into geor1 from georaster_table where georid = 101;
dbms_lob.create_temporary(out_lob, TRUE);
geom:=null;
sdo_geor_ra.over(geor,geor1,geom,null,out_lob, outArea, outWindow);
if outWindow is not null then
dbms_output.put_line('output window: (' || outWindow(1) || ',' ||
outWindow(2) || ',' || outWindow(3) || ',' || outWindow(4) || ')');
end if;
dbms_lob.freeTemporary(out_lob);
END;
/