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GDAL's coordinate system demo
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#include <ogr_srs_api.h> | |
#include <cpl_conv.h> | |
int main(void) { | |
OGRSpatialReferenceH sr = OSRNewSpatialReference(NULL); | |
OSRImportFromEPSG(sr, 3857); | |
// OSRSetWellKnownGeogCS(sr, "WGS84"); | |
char* ppsz; | |
OSRExportToPrettyWkt(sr, &ppsz, FALSE); | |
printf("3857.wkt: \n%s\n", ppsz); | |
CPLFree(ppsz); | |
printf("3857.au: %s\n", OSRGetAuthorityCode(sr,NULL)); | |
printf("3857.geogcs.au: %s\n", OSRGetAuthorityCode(sr, "GEOGCS")); | |
printf("3857.geogcs|unit.au: %s\n", OSRGetAuthorityCode(sr, "GEOGCS|UNIT")); | |
printf("3857.geogcs|datum.au: %s\n", OSRGetAuthorityCode(sr, "GEOGCS|DATUM")); | |
printf("3857.geogcs|datum|spheroid.au: %s\n", OSRGetAuthorityCode(sr, "GEOGCS|DATUM|SPHEROID")); | |
printf("3857.projcs.au: %s\n", OSRGetAuthorityCode(sr, "PROJCS")); | |
//OGRSpatialReferenceH hLatLong = OSRCloneGeogCS(sr); | |
OGRSpatialReferenceH hLatLong = OSRNewSpatialReference(NULL); | |
OSRSetWellKnownGeogCS(hLatLong, "WGS84"); | |
printf("wgs84.au: %s\n", OSRGetAuthorityCode(hLatLong, NULL)); | |
printf("wgs84.geogcs.au: %s\n", OSRGetAuthorityCode(hLatLong, "GEOGCS")); | |
printf("wgs84.geogcs|unit.au: %s\n", OSRGetAuthorityCode(hLatLong, "GEOGCS|UNIT")); | |
printf("wgs84.geogcs|datum.au: %s\n", OSRGetAuthorityCode(hLatLong, "GEOGCS|DATUM")); | |
printf("wgs84.geogcs|datum|spheroid.au: %s\n", OSRGetAuthorityCode(hLatLong, "GEOGCS|DATUM|SPHEROID")); | |
printf("wgs84.projcs.au: %s\n", OSRGetAuthorityCode(hLatLong, "PROJCS")); | |
OGRCoordinateTransformationH hTransform = OCTNewCoordinateTransformation(sr,hLatLong); | |
double x = 12955467.346012; | |
double y = 4854848.34787838; | |
double z = 0; | |
OCTTransform(hTransform, 1, &x, &y, &z); | |
printf("x: %f, y: %f, z: %f\n", x, y, z); | |
OCTDestroyCoordinateTransformation(hTransform); | |
OSRDestroySpatialReference(sr); | |
OGRSpatialReferenceH hUTM = OSRNewSpatialReference(NULL); | |
OSRSetProjCS(hUTM, "UTM 20 / WGS84"); | |
OSRSetWellKnownGeogCS(hUTM, "WGS84"); | |
OSRSetUTM(hUTM, 20, TRUE); | |
hTransform = OCTNewCoordinateTransformation(hLatLong, hUTM); | |
OCTTransform(hTransform, 1, &x, &y, &z); | |
printf("x: %f, y: %f, z: %f\n", x, y, z); | |
OCTDestroyCoordinateTransformation(hTransform); | |
OSRDestroySpatialReference(hUTM); | |
return 0; | |
} |
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gcc
gdal-config --cflags
osr_test.cgdal-config --libs
-o osr_test