Release 9.0.1
Part Number A88805-01
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| Oracle Spatial User's Guide and Reference Release 9.0.1 Part Number A88805-01 |
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This chapter describes in greater detail the Oracle Spatial coordinate system support, which was introduced in Section 1.5.4. You can store and manipulate SDO_GEOMETRY objects in a variety of coordinate systems.
For reference information about coordinate system transformation functions and procedures, see Chapter 14.
This section explains important terms and concepts related to coordinate system support in Oracle Spatial.
A coordinate system (also called a spatial reference system) is a means of assigning coordinates to a location and establishing relationships between sets of such coordinates. It enables the interpretation of a set of coordinates as a representation of a position in a real world space.
Cartesian coordinates are coordinates that measure the position of a point from a defined origin along axes that are perpendicular in the represented two-dimensional or three-dimensional space.
Geodetic coordinates (sometimes called geographic coordinates) are angular coordinates (longitude and latitude), closely related to spherical polar coordinates, and are defined relative to a particular Earth geodetic datum (described in Section 5.1.6). For more information about geodetic coordinate system support, see Section 5.2.
Projected coordinates are planar Cartesian coordinates that result from performing a mathematical mapping from a point on the Earth's surface to a plane. There are many such mathematical mappings, each used for a particular purpose.
Local coordinates are Cartesian coordinates in a non-Earth (non-georeferenced) coordinate system. Section 5.3 describes local coordinate system support in Spatial.
A geodetic datum is a means of representing the figure of the Earth, usually as an oblate ellipsoid of revolution, that approximates the surface of the Earth locally or globally, and is the reference for the system of geodetic coordinates.
An authalic sphere is a sphere that has the same surface area as a particular oblate ellipsoid of revolution representing the figure of the Earth.
Transformation is the conversion of coordinates from one coordinate system to another coordinate system.
If the coordinate system is georeferenced, transformation can involve datum transformation: the conversion of geodetic coordinates from one geodetic datum to another geodetic datum, usually involving changes in the shape, orientation, and center position of the reference ellipsoid.
With Oracle9i, Spatial provides a rational and complete treatment of geodetic coordinates. Before Oracle 9i, Spatial computations were based solely on flat (Cartesian) coordinates, regardless of the coordinate system specified for the layer of geometries. Consequently, computations for data in geodetic coordinate systems were inaccurate, because they always treated the coordinates as if they were on a flat surface, and they did not consider the curvature of the surface.
With the current release, ellipsoidal surface computations consider the curvatures of arcs in the specified geodetic coordinate system and return correct, accurate results. In other words, with the current release, Spatial queries return the right answers all the time.
A two-dimensional geometry is a surface geometry, but the important question is: What is the surface? A flat surface (plane) is accurately represented by Cartesian coordinates. However, Cartesian coordinates are not adequate for representing the surface of a solid. A commonly used surface for spatial geometry is the surface of the Earth, and the laws of geometry there are different than they are in a plane. For example, on the Earth's surface there are no parallel lines: lines are geodesics, and all geodesics intersect. Thus, closed curved surface problems cannot be done accurately with Cartesian geometry.
With Oracle9i, Spatial provides accurate results regardless of the coordinate system or the size of the area involved, without requiring that the data be projected to a flat surface. The results are accurate regardless of where on the Earth's surface the query is focused, even in "special" areas such as the poles. Thus, you can store coordinates in any datum and projections that you choose, and you can perform accurate queries regardless of the coordinate system.
For applications that deal with the Earth's surface, the data can be represented using a geodetic coordinate system or a projected plane coordinate system. In deciding which approach to take with the data, consider any needs related to accuracy and performance:
For many spatial applications, the area is sufficiently small to allow adequate computations on Cartesian coordinates in a local projection. For example, the New Hampshire State Plane local projection provides adequate accuracy for most spatial applications that use data for that state.
However, Cartesian computations on a plane projection will never give accurate results for a large area such as Canada or Scandinavia. For example, a query asking if Stockholm, Sweden and Helsinki, Finland are within a specified distance may return an incorrect result if the specified distance is close to the actual measured distance. Computations involving large areas -- or requiring very precise accuracy -- must account for the curvature of the Earth's surface.
Spherical computations use more computing resources than Cartesian computations, and take longer to complete. In general, a Spatial operation using geodetic coordinates will take two to three times longer than the same operation using Cartesian coordinates.
The following geometries are not permitted if a geodetic coordinate system is used:
However, you can use the SDO_CS.VIEWPORT_TRANSFORM function to convert optimized longitude/latitude rectangles to valid geodetic polygons for use with the SDO_FILTER operator.
Geodetic coordinate system support is provided only for geometries that consist of points or geodesics (lines on the ellipsoid). If you have geometries containing circles or circular arcs in a projected coordinate system, you can densify them using the SDO_GEOM.SDO_ARC_DENSIFY function (documented in Chapter 12) before transforming them to geodetic coordinates, and then perform Spatial operations on the resulting geometries.
The following size limits apply with geodetic data:
If you need to work with larger elements, first break these elements into multiple smaller elements and work with them. For example, you cannot create an element representing all the ocean surface of the Earth; however, you can create multiple elements, each representing part of the overall ocean surface.
Geodetic layers must be indexed using an R-tree index. (You can create a quadtree index on geodetic data by specifying 'geodetic=FALSE' in the PARAMETERS clause of the CREATE INDEX statement; however, this is not recommended. See the Usage Notes for the CREATE INDEX statement in Chapter 9 for more information.) In addition, for Spatial release 9.0.1 you must delete (DROP INDEX) and re-create all spatial indexes on geodetic data from a previous release.
Tolerance is specified as meters for geodetic layers. Note that if you use tolerance values typical for non-geodetic data, these values are interpreted as meters for geodetic data. For example, if you specify a tolerance value of 0.005 for geodetic data, this is interpreted as precise to 5 millimeters. If this value is more precise than your applications need, performance may be affected because of the internal computational steps taken to implement the specified precision. (For more information about tolerance, see Section 1.5.5.)
See Section 5.7 for additional notes and restrictions relating to geodetic data.
With Oracle9i, Spatial provides a level of support for local coordinate systems. Local coordinate systems are often used in CAD systems, and they can also be used in local surveys where the relationship between the surveyed site and the rest of the world is not important.
Several local coordinate systems are predefined and included with Spatial in the MDSYS.CS_SRS table (described in Section 5.4.1). These supplied local coordinate systems, whose names start with Non-Earth, define non-Earth Cartesian coordinate systems based on different units of measurement (Meter, Millimeter, Inch, and so on). In the current release, you can use these local coordinate systems only to convert coordinates in a local coordinate system from one unit of measurement to another (for example, inches to millimeters) by transforming a geometry or a layer of geometries.
The coordinate systems functions and procedures use information provided in the following tables supplied with Oracle Spatial:
http://www.opengis.org).
You should not modify or delete any Oracle-supplied information in any of the tables that are used for coordinate system support.
You should not add any information to the MDSYS.CS_SRS or MDSYS.SDO_DATUMS table unless you are creating a user-defined coordinate system. (Do not add information to the MDSYS.SDO_ELLIPSOIDS or MDSYS.PROJECTIONS tables.) Section 5.5 describes how to create a user-defined coordinate system.
Note:
The MDSYS.CS_SRS reference table contains over 900 rows, one for each valid coordinate system.
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Note: You should probably not modify, delete, or add any information in the MDSYS.CS_SRS table. If you plan to add any user-defined coordinate systems, be sure to use SRID values of 1000000 (1 million) or higher, and follow the guidelines in Section 5.5. |
The MDSYS.CS_SRS table contains the columns shown in Table 5-1.
| Column Name | Data Type | Description |
|---|---|---|
|
CS_NAME |
VARCHAR2(68) |
A well-known name, often mnemonic, by which a user can refer to the coordinate system. |
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SRID |
INTEGER |
The unique ID number (Spatial Reference ID) for a coordinate system. Currently, SRID values 1-999999 are reserved for use by Oracle Spatial, and values 1000000 (1 million) and higher are available for user-defined coordinate systems. |
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AUTH_SRID |
INTEGER |
An optional ID number that can be used to indicate how the entry was derived; it might be a foreign key into another coordinate table, for example. |
|
AUTH_NAME |
VARCHAR2(256) |
An authority name for the coordinate system. Contains 'Oracle' in the supplied table. Users can specify any value in any rows that they add. |
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WKTEXT |
VARCHAR2(2046) |
The well-known text (WKT) description of the SRS, as defined by the OpenGIS Consortium. For more information, see Section 5.4.1.1. |
|
CS_BOUNDS |
MDSYS.SDO_GEOMETRY |
Optional SDO_GEOMETRY object that is a polygon with WGS-84 longitude and latitude vertices, representing the spheroidal polygon description of the zone of validity for a projected coordinate system. Must be null for a geographic or non-Earth coordinate system. Is null in all supplied rows. |
The WKTEXT column of the MDSYS.CS_SRS table contains the well-known text (WKT) description of the SRS, as defined by the OpenGIS Consortium.
The following is the WKT EBNF syntax. All user-defined coordinate systems must strictly comply with this syntax.
<coordinate system> ::= <horz cs> | <local cs> <horz cs> ::= <geographic cs> | <projected cs> <projected cs> ::= PROJCS [ "<name>", <geographic cs>, <projection>, <parameter>,}* <linear unit> ] <projection> ::= PROJECTION [ "<name>" ] <parameter> ::= PARAMETER [ "name", <number> ] <geographic cs> ::= GEOGCS [ "<name>", <datum>, <prime meridian>, <angular unit> ] <datum> ::= DATUM [ "<name>", <spheroid> {, <shift-x>, <shift-y>, <shift-z> , <rot-x>, <rot-y>, <rot-z>, <scale_adjust>} ] <spheroid> ::= SPHEROID ["<name>", <semi major axis>, <inverse flattening> ] <prime meridian> ::= PRIMEM ["<name>", <longitude> ] <longitude> ::= <number> <semi-major axis> ::= <number> <inverse flattening> ::= <number> <angular unit> ::= <unit> <linear unit> ::= <unit> <unit> ::= UNIT [ "<name>", <conversion factor> ] <local cs> ::= LOCAL_CS [ "<name>", <local datum>, <linear unit>, <axis> {, <axis>}* ] <local datum> ::= LOCAL_DATUM [ "<name>", <datum type> {, <shift-x>, <shift-y>, <shift-z> , <rot-x>, <rot-y>, <rot-z>, <scale_adjust>} ] <datum type> ::= <number> <axis> ::= AXIS [ "<name>", NORTH | SOUTH | EAST | WEST | UP | DOWN | OTHER ]
An example of the WKT for a geodetic (geographic) coordinate system is:
'GEOGCS [ "Longitude / Latitude (Old Hawaiian)", DATUM ["Old Hawaiian", SPHEROID ["Clarke 1866", 6378206.400000, 294.978698]], PRIMEM [ "Greenwich", 0.000000 ], UNIT ["Decimal Degree", 0.01745329251994330]]'
The WKT definition of the coordinate system is hierarchically nested. The Old Hawaiian geographic coordinate system (GEOGCS) is composed of a named datum (DATUM), a prime meridian (PRIMEM), and a unit definition (UNIT). The datum is in turn composed of a named spheroid and its parameters of semimajor axis and inverse flattening.
An example of the WKT for a projected coordinate system (a Wyoming state plane) is:
'PROJCS["Wyoming 4901, Eastern Zone (1983, meters)", GEOGCS [ "GRS 80", DATUM ["GRS 80", SPHEROID ["GRS 80", 6378137.000000, 298.257222]], PRIMEM [ "Greenwich", 0.000000 ], UNIT ["Decimal Degree", 0.01745329251994330]], PROJECTION ["Transverse Mercator"], PARAMETER ["Scale_Factor", 0.999938], PARAMETER ["Central_Meridian", -105.166667], PARAMETER ["Latitude_Of_Origin", 40.500000], PARAMETER ["False_Easting", 200000.000000], UNIT ["Meter", 1.000000000000]]'
The projected coordinate system contains a nested geographic coordinate system as its basis, as well as parameters that control the projection.
Oracle Spatial supports all the common geodetic datums and map projections.
An example of the WKT for a local coordinate system is:
LOCAL_CS [ "Non-Earth (Meter)", LOCAL_DATUM ["Local Datum", 0], UNIT ["Meter", 1.0], AXIS ["X", EAST], AXIS["Y", NORTH]]
Local coordinate systems are described in Section 5.3.
The MDSYS.SDO_ANGLE_UNITS reference table contains one row for each valid UNIT specification in the well-known text (WKT) description in the coordinate system definition. The WKT is described in Section 5.4.1.1.
The MDSYS.SDO_ANGLE_UNITS table contains the columns shown in Table 5-2.
The MDSYS.SDO_DIST_UNITS reference table contains one row for each valid distance unit specification in the well-known text (WKT) description in the coordinate system definition. The WKT is described in Section 5.4.1.1.
The MDSYS.SDO_DIST_UNITS table contains the columns shown in Table 5-3.
The MDSYS.SDO_DATUMS reference table contains one row for each valid DATUM specification in the well-known text (WKT) description in the coordinate system definition. The WKT is described in Section 5.4.1.1.
The MDSYS.SDO_DATUMS table contains the columns shown in Table 5-4.
The MDSYS.SDO_ELLIPSOIDS reference table contains one row for each valid SPHEROID specification in the well-known text (WKT) description in the coordinate system definition. The WKT is described in Section 5.4.1.1.
The MDSYS.SDO_ELLIPSOIDS table contains the columns shown in Table 5-5.
The MDSYS.SDO_PROJECTIONS reference table contains one row for each valid PROJECTION specification in the well-known text (WKT) description in the coordinate system definition. The WKT is described in Section 5.4.1.1.
The MDSYS.SDO_PROJECTIONS table contains the column shown in Table 5-6.
To create a user-defined coordinate system, add a row to the MDSYS.CS_SRS table. See Section 5.4.1 for information about this table, including the requirements for values in each column.
To specify the WKTEXT column in the MDSYS.CS_SRS table, follow the syntax specified in Section 5.4.1.1. See also the examples in that section.
When you specify the WKTEXT column entry, use valid values from several Spatial reference tables:
If you supply a user-defined datum, the datum name must be different from any datum name in the MDSYS.SDO_DATUMS table, and the WKT must specify the datum parameters in the order listed in Section 5.4.1.1. Any parameters not specified in a user-defined datum default to zero.
Use meters as the linear unit and decimal degrees as the angular unit for semi-major axis, prime meridian, and projection parameter specifications.
The name in each PARAMETER specification must be one of the following, depending on the projection that you use:
Some of these parameters are appropriate for several projections. They are not all appropriate for every projection.
The current release of Oracle Spatial includes the following functions and procedures for data transformation using coordinate systems:
Reference information about these functions and procedures is in Chapter 14.
Support for additional functions and procedures is planned for future releases of Oracle Spatial.
The following notes and restrictions apply to coordinate systems support in the current release of Spatial.
If you have geodetic data, see also Section 5.2 for considerations, guidelines, and additional restrictions.
In the current release, the following functions are not supported with geodetic data:
In the current release, the following functions are supported by approximations with geodetic data:
When these functions are used on data with geodetic coordinates, they internally perform the operations in an implicitly generated local-tangent-plane Cartesian coordinate system and then transform the results to the geodetic coordinate system. For SDO_GEOM.SDO_BUFFER, generated arcs are approximated by line segments before the back-transform.
This section presents a simplified example that uses coordinate system transformation functions and procedures. It refers to concepts that are explained in this chapter and uses functions documented in Chapter 14.
Example 5-1 uses mostly the same geometry data (cola markets) as in Section 2.1, except that instead of null SDO_SRID values, the SDO_SRID value 8307 is used. That is, the geometries are defined as using the coordinate system whose SRID is 8307 and whose well-known name is "Longitude / Latitude (WGS 84)". This is probably the most widely used coordinate system, and it is the one used for global positioning system (GPS) devices. The geometries are then transformed using the coordinate system whose SRID is 8199 and whose well-known name is "Longitude / Latitude (Arc 1950)".
Example 5-1 uses the geometries illustrated in Figure 2-1 in Section 2.1, except that cola_d is a rectangle (here, a square) instead of a circle, because arcs are not supported with geodetic coordinate systems.
Example 5-1 does the following:
Example 5-2 includes the output of the SELECT statements in Example 5-1.
-- Create a table for cola (soft drink) markets in a -- given geography (such as city or state). -- Each row will be an area of interest for a specific -- cola (for example, where the cola is most preferred -- by residents, where the manufacturer believes the -- cola has growth potential, etc. CREATE TABLE cola_markets_cs ( mkt_id NUMBER PRIMARY KEY, name VARCHAR2(32), shape MDSYS.SDO_GEOMETRY); -- Note re. areas of interest: cola_a (rectangle) and -- cola_b (4-sided polygon) are side by side (share 1 border). -- cola_c is a small 4-sided polygon that overlaps parts of -- cola_a and cola_b. A rough sketch: -- ---------+- -- | a | b \ -- | +------+ | -- | /___c _| | -- | | | -- ---------+---------| -- The next INSERT statement creates an area of interest for -- Cola A. This area happens to be a rectangle. -- The area could represent any user-defined criterion: for -- example, where Cola A is the preferred drink, where -- Cola A is under competitive pressure, where Cola A -- has strong growth potential, and so on. INSERT INTO cola_markets_cs VALUES( 1, 'cola_a', MDSYS.SDO_GEOMETRY( 2003, -- 2-dimensional polygon 8307, -- SRID for 'Longitude / Latitude (WGS 84)' coordinate system NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1), -- polygon MDSYS.SDO_ORDINATE_ARRAY(1,1, 5,1, 5,7, 1,7, 1,1) -- All vertices must -- be defined for rectangle with geodetic data. ) ); -- The next two INSERT statements create areas of interest for -- Cola B and Cola C. These areas are simple polygons (but not -- rectangles). INSERT INTO cola_markets_cs VALUES( 2, 'cola_b', MDSYS.SDO_GEOMETRY( 2003, -- 2-dimensional polygon 8307, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1), -- one polygon (exterior polygon ring) MDSYS.SDO_ORDINATE_ARRAY(5,1, 8,1, 8,6, 5,7, 5,1) ) ); INSERT INTO cola_markets_cs VALUES( 3, 'cola_c', MDSYS.SDO_GEOMETRY( 2003, -- 2-dimensional polygon 8307, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1), --one polygon (exterior polygon ring) MDSYS.SDO_ORDINATE_ARRAY(3,3, 6,3, 6,5, 4,5, 3,3) ) ); -- Insert a rectangle (here, square) instead of a circle as in the original, -- because arcs are not supported with geodetic coordinate systems. INSERT INTO cola_markets_cs VALUES( 4, 'cola_d', MDSYS.SDO_GEOMETRY( 2003, -- 2-dimensional polygon 8307, -- SRID for 'Longitude / Latitude (WGS 84)' coordinate system NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1), -- polygon MDSYS.SDO_ORDINATE_ARRAY(10,9, 11,9, 11,10, 10,10, 10,9) -- All vertices must -- be defined for rectangle with geodetic data. ) ); --------------------------------------------------------------------------- -- UPDATE METADATA VIEW -- --------------------------------------------------------------------------- -- Update the USER_SDO_GEOM_METADATA view. This is required -- before the Spatial index can be created. Do this only once for each -- layer (i.e., table-column combination; here: cola_markets_cs and shape). INSERT INTO USER_SDO_GEOM_METADATA VALUES ( 'cola_markets_cs', 'shape', MDSYS.SDO_DIM_ARRAY( MDSYS.SDO_DIM_ELEMENT('Longitude', -180, 180, 10), -- 10 meters tolerance MDSYS.SDO_DIM_ELEMENT('Latitude', -90, 90, 10) -- 10 meters tolerance ), 8307 -- SRID for ''Longitude / Latitude (WGS 84)' coordinate system ); ------------------------------------------------------------------- -- CREATE THE SPATIAL INDEX -- ------------------------------------------------------------------- -- Must be R-tree; quadtree not supported for geodetic data. CREATE INDEX cola_spatial_idx_cs ON cola_markets_cs(shape) INDEXTYPE IS MDSYS.SPATIAL_INDEX; ------------------------------------------------------------------- -- TEST COORDINATE SYSTEM TRANSFORMATION -- ------------------------------------------------------------------- -- Return the transformation of cola_c using to_srid 8199 -- ('Longitude / Latitude (Arc 1950)') SELECT c.name, SDO_CS.TRANSFORM(c.shape, m.diminfo, 8199) FROM cola_markets_cs c, user_sdo_geom_metadata m WHERE m.table_name = 'COLA_MARKETS_CS' AND m.column_name = 'SHAPE' AND c.name = 'cola_c'; -- Same as preceding, but using to_srname parameter. SELECT c.name, SDO_CS.TRANSFORM(c.shape, m.diminfo, 'Longitude / Latitude (Arc 1950)') FROM cola_markets_cs c, user_sdo_geom_metadata m WHERE m.table_name = 'COLA_MARKETS_CS' AND m.column_name = 'SHAPE' AND c.name = 'cola_c'; -- Transform the entire SHAPE layer and put results in the table -- named cola_markets_cs_8199, which the procedure will create. EXECUTE SDO_CS.TRANSFORM_LAYER('COLA_MARKETS_CS','SHAPE','COLA_MARKETS_CS_ 8199',8199); -- Select all from the old (existing) table. SELECT * from cola_markets_cs; -- Select all from the new (layer transformed) table. SELECT * from cola_markets_cs_8199; -- Show metadata for the new (layer transformed) table. DESCRIBE cola_markets_cs_8199; -- Viewport_Transform SELECT c.name FROM cola_markets_cs c WHERE SDO_FILTER(c.shape, SDO_CS.VIEWPORT_TRANSFORM( MDSYS.SDO_GEOMETRY( 2003, 0, -- SRID = 0 (special case) NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,3), MDSYS.SDO_ORDINATE_ARRAY(-180,-90,180,90)), 8307), 'querytype=window') = 'TRUE';
Example 5-2 shows the output of the SELECT statements in Example 5-1. Notice the slight differences between the coordinates in the original geometries (SRID 8307) and the transformed coordinates (SRID 8199) -- for example, (1, 1, 5, 1, 5, 7, 1, 7, 1, 1) and (1.00078604, 1.00274579, 5.00069354, 1.00274488, 5.0006986, 7.00323528, 1.00079179, 7.00324162, 1.00078604, 1.00274579) for cola_a.
SQL> -- Return the transformation of cola_c using to_srid 8199 SQL> -- ('Longitude / Latitude (Arc 1950)') SQL> SELECT c.name, SDO_CS.TRANSFORM(c.shape, m.diminfo, 8199) 2 FROM cola_markets_cs c, user_sdo_geom_metadata m 3 WHERE m.table_name = 'COLA_MARKETS_CS' AND m.column_name = 'SHAPE' 4 AND c.name = 'cola_c'; NAME -------------------------------- SDO_CS.TRANSFORM(C.SHAPE,M.DIMINFO,8199)(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z) -------------------------------------------------------------------------------- cola_c SDO_GEOMETRY(2003, 8199, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_ARR AY(3.00074114, 3.00291482, 6.00067068, 3.00291287, 6.0006723, 5.00307625, 4.0007 1961, 5.00307838, 3.00074114, 3.00291482)) SQL> SQL> -- Same as preceding, but using to_srname parameter. SQL> SELECT c.name, SDO_CS.TRANSFORM(c.shape, m.diminfo, 'Longitude / Latitude (Arc 1950)') 2 FROM cola_markets_cs c, user_sdo_geom_metadata m 3 WHERE m.table_name = 'COLA_MARKETS_CS' AND m.column_name = 'SHAPE' 4 AND c.name = 'cola_c'; NAME -------------------------------- SDO_CS.TRANSFORM(C.SHAPE,M.DIMINFO,'LONGITUDE/LATITUDE(ARC1950)')(SDO_GTYPE, SDO -------------------------------------------------------------------------------- cola_c SDO_GEOMETRY(2003, 8199, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_ARR AY(3.00074114, 3.00291482, 6.00067068, 3.00291287, 6.0006723, 5.00307625, 4.0007 1961, 5.00307838, 3.00074114, 3.00291482)) SQL> SQL> -- Transform the entire SHAPE layer and put results in the table SQL> -- named cola_markets_cs_8199, which the procedure will create. SQL> EXECUTE SDO_CS.TRANSFORM_LAYER('COLA_MARKETS_CS','SHAPE','COLA_MARKETS_CS_ 8199',8199); PL/SQL procedure successfully completed. SQL> SQL> -- Select all from the old (existing) table. SQL> SELECT * from cola_markets_cs; MKT_ID NAME ---------- -------------------------------- SHAPE(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z), SDO_ELEM_INFO, SDO_ORDINATES) -------------------------------------------------------------------------------- 1 cola_a SDO_GEOMETRY(2003, 8307, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_ARR AY(1, 1, 5, 1, 5, 7, 1, 7, 1, 1)) 2 cola_b SDO_GEOMETRY(2003, 8307, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_ARR AY(5, 1, 8, 1, 8, 6, 5, 7, 5, 1)) 3 cola_c MKT_ID NAME ---------- -------------------------------- SHAPE(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z), SDO_ELEM_INFO, SDO_ORDINATES) -------------------------------------------------------------------------------- SDO_GEOMETRY(2003, 8307, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_ARR AY(3, 3, 6, 3, 6, 5, 4, 5, 3, 3)) 4 cola_d SDO_GEOMETRY(2003, 8307, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_ARR AY(10, 9, 11, 9, 11, 10, 10, 10, 10, 9)) SQL> SQL> -- Select all from the new (layer transformed) table. SQL> SELECT * from cola_markets_cs_8199; SDO_ROWID ------------------ GEOMETRY(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z), SDO_ELEM_INFO, SDO_ORDINATES) -------------------------------------------------------------------------------- AAABZzAABAAAOa6AAA SDO_GEOMETRY(2003, 8199, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_ARR AY(1.00078604, 1.00274579, 5.00069354, 1.00274488, 5.0006986, 7.00323528, 1.0007 9179, 7.00324162, 1.00078604, 1.00274579)) AAABZzAABAAAOa6AAB SDO_GEOMETRY(2003, 8199, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_ARR AY(5.00069354, 1.00274488, 8.00062191, 1.00274427, 8.00062522, 6.00315345, 5.000 6986, 7.00323528, 5.00069354, 1.00274488)) SDO_ROWID ------------------ GEOMETRY(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z), SDO_ELEM_INFO, SDO_ORDINATES) -------------------------------------------------------------------------------- AAABZzAABAAAOa6AAC SDO_GEOMETRY(2003, 8199, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_ARR AY(3.00074114, 3.00291482, 6.00067068, 3.00291287, 6.0006723, 5.00307625, 4.0007 1961, 5.00307838, 3.00074114, 3.00291482)) AAABZzAABAAAOa6AAD SDO_GEOMETRY(2003, 8199, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_ARR AY(10.0005802, 9.00337775, 11.0005553, 9.00337621, 11.0005569, 10.0034478, 10.00 SDO_ROWID ------------------ GEOMETRY(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z), SDO_ELEM_INFO, SDO_ORDINATES) -------------------------------------------------------------------------------- 05819, 10.0034495, 10.0005802, 9.00337775)) SQL> SQL> -- Show metadata for the new (layer transformed) table. SQL> DESCRIBE cola_markets_cs_8199; Name Null? Type ----------------------------------------- -------- ---------------------------- SDO_ROWID ROWID GEOMETRY MDSYS.SDO_GEOMETRY SQL> SQL> -- Viewport_Transform SQL> SELECT c.name FROM cola_markets_cs c WHERE 2 SDO_FILTER(c.shape, SDO_CS.VIEWPORT_TRANSFORM( 3 MDSYS.SDO_GEOMETRY( 4 2003, 5 0, -- SRID = 0 (special case) 6 NULL, 7 MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,3), 8 MDSYS.SDO_ORDINATE_ARRAY(-180,-90,180,90)), 9 8307), 'querytype=window') = 'TRUE'; NAME -------------------------------- cola_a cola_c cola_b cola_d
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