The SE_CreateSrtext() function

The SE_CreateSrtext() function returns the OGC well-known text representation of a spatial reference system, given the ESRI Projection Engine ID number for a coordinate system.

The ID numbers are in the file pedef.h, in the directory $INFORMIXDIR/extend/spatial.version/include.

Syntax

SE_CreateSrtext (factory_id integer)
SE_CreateSrtext (factory_id integer, type varchar(64) default NULL)

The type parameter indicates the type of spatial reference system when different types of systems have overlapping IDs. The following table lists the values of the type parameter. You can use either the long type value or the corresponding short type value.

Table 1. Object types
Long type value	Short type value	Spatial reference system name
geogcs	gcs	Geographic Coordinate System
projcs	pcs	Projected Coordinate System
coordsys	crs	Either the Geographic Coordinate System or the Project Coordinate System
vertcs	vcs	Vertical Coordinate System
geoxyzcs	xyz	Geographic Coordinate System with XYZ coordinates
hvcoordsys	hvc	Horizontal-vertical Coordinate System
datum	dat	Datum
vdatum	vdt	Vertical datum
hvdatum	hvd	Either datum or vertical datum
geogtran	gtf	Geographic Transform
verttran	vtf	Vertical Transform
linunit	lin	Linear units
angunit	ang	Angular units
unit	uni	Either linear or angular units
areaunit	are	Area units
primem	pri	Prime Meridian
spheriod	sph	Spheroid
method	mth	Method
htmethod	htm	Horizontal method
vtmethod	vtm	Vertical method
projection	prj	Projection method
parameter	par	Parameter

Return type

LVARCHAR

Example

To obtain the spatial reference system text for the 1983 North American Datum:

EXECUTE FUNCTION SE_CreateSrtext(4269);


(expression)  GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SP
              HEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],U
              NIT["Degree",0.0174532925199432955]]

Tip: You can transfer the output of SE_CreateSrtext() directly into the spatial_references table with the following SQL statement:

UPDATE spatial_references 
   SET srtext = SE_CreateSrtext(4269) WHERE srid = 1000;