pe_hvcoordsys_to_prjstring

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

Usage syntax

void pe_hvcoordsys_to_prjstring (PE_HVCOORDSYS hvcoordsys, const char *string, int *ierror);

Parameters

Description

Converts a PE horizontal-vertical 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 
Zunits      METERS
Datum       WGS84 
Spheroid    WGS84 
Zone        11 
Parameters 

Here is the equivalent PE string representation (reformatted for display) of a PE projected-vertical 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",0.0174532925199433]],
   PROJECTION["Transverse_Mercator"],
   PARAMETER["False_Easting",500000.0],
   PARAMETER["False_Northing",0.0], 
   PARAMETER["Central_Meridian",-117.0],
   PARAMETER["Scale_Factor",0.9996],
   PARAMETER["Latitude_Of_Origin",0.0],
   UNIT["Meter",1]],
   VERTCS["Unknown VCS", 
      VDATUM["Unknown",
      PARAMETER["Vertical_Shift",0.0],
      PARAMETER["Direction",1.0],
      UNIT["Meter",1]]

Note: You need to include the pe_coordsys_from_prj.h header file to use this function.

Returns

On success, an old-style PRJ file.

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_HVCOORDSYS hvcoordsys;
char *prjstring;
int err = 0;
/* Define the hvcoordsys */
pe_hvcoordsys_to_prjstring(hvcoordsys,prjstring,&err);
if (err != 0)
{
   printf("Error code = %d\n",err);
}