pe_coordsys_to_prjstring

Converts a coordinate system object to an old-style PRJ file in string format

Usage syntax

void pe_coordsys_to_prjstring (PE_COORDSYS coordsys, (PE_UNIT zunit, const char *string, int *error);

Parameters
coordsys A coordinate system object
zunit A linear unit object
string A pointer to a string that contains an old-style PRJ file in string format
error A pointer to an error code
Description

This function converts a PE coordinate system object to an old-style PRJ file in string format. An old-style PRJ file is used by the coverage, grid, and TIN data formats. The files, named prj.adf, are located in the dataset directory.

Here is a sample PRJ file.

Projection UTM
Units METERS
Datum WGS84
Spheroid WGS84
Zone 11
Parameters

Here is the equivalent PE string representation (reformatted for display) of a PE projected coordinate system object.

PROJCS["WGS_1984_UTM_Zone_11N",
     GEOGCS["GCS_WGS_1984",
     DATUM["D_WGS_1984",
     SPHEROID["WGS_1984",6378137,298.257223563]],
     PRIMEM["Greenwich",0],
     UNIT["Degree",0.017453292519943295]],
PROJECTION["Transverse_Mercator"],
PARAMETER["False_Easting",500000],
PARAMETER["False_Northing",0],
PARAMETER["Central_Meridian",-117],
PARAMETER["Scale_Factor",0.9996],
PARAMETER["Latitude_Of_Origin",0],
UNIT["Meter",1]]

Note: You need to include the pe_coordsys_from_prj.h header file to use this function. This file is included in the ArcSDE SDK.

Returns

On success, an old-style PRJ file; otherwise, one of the following is returned:

   PE_PRJ_CANNOT_OPEN_FILE      The path or file name is incorrect or does not exist.

   PE_PRJ_ILLEGAL_ARGUMENT      The pointer to the path or file name is null or blank.

   PE_TOPRJ_ILLEGAL_PARAMETER   One of the parameters is incorrect or cannot be converted. The equivalent map projection in ArcInfo Workstation may not support the parameter.

   PE_TOPRJ_ILLEGAL_PRIMEM      The prime meridian is not Greenwich and cannot be converted.

   PE_TOPRJ_ILLEGAL_PROJECTION  The map projection cannot be converted. ArcInfo Workstation may not support it.

   PE_PRJ_ILLEGAL_SCALE_FACTOR  The scale factor parameter is not supported by the equivalent map projection in ArcInfo Workstation.

   PE_TOPRJ_ILLEGAL_SPHEROID    The spheroid is incorrect or cannot be converted. The map projection in ArcInfo Workstation may not support a spheroid.

   PE_TOPRJ_ILLEGAL_UNIT        The unit is incorrect or cannot be converted. ArcInfo Workstation may not support it. Usually will occur when the units of the geographic coordinate system are grads.

   PE_PRJ_OUT_OF_MEMORY         The string is not long enough or the system has run out of memory.

Examples

PE_COORDSYS coordsys;
char *prjstring;
int err = 0;
coordsys = pe_factory_projcs(PE_PCS_WGS_1984_UTM_11N);
pe_coordsys_to_prjstring(coordsys,NULL,prjstring,&err);
if (err != 0)
{
   printf("Error code = %d\n",err);
}