PostGIS  2.5.7dev-r@@SVN_REVISION@@

◆ RASTER_getPixelWidth()

Datum RASTER_getPixelWidth ( PG_FUNCTION_ARGS  )

Definition at line 368 of file rtpg_raster_properties.c.

369 {
370  rt_pgraster *pgraster;
372  double xscale;
373  double yskew;
374  double pwidth;
375 
376  if (PG_ARGISNULL(0)) PG_RETURN_NULL();
377  pgraster = (rt_pgraster *)PG_DETOAST_DATUM_SLICE(PG_GETARG_DATUM(0), 0, sizeof(struct rt_raster_serialized_t));
378 
379  raster = rt_raster_deserialize(pgraster, TRUE);
380  if (!raster) {
381  PG_FREE_IF_COPY(pgraster, 0);
382  elog(ERROR, "RASTER_getPixelWidth: Could not deserialize raster");
383  PG_RETURN_NULL();
384  }
385 
386  xscale = rt_raster_get_x_scale(raster);
387  yskew = rt_raster_get_y_skew(raster);
388  pwidth = sqrt(xscale*xscale + yskew*yskew);
389 
391  PG_FREE_IF_COPY(pgraster, 0);
392 
393  PG_RETURN_FLOAT8(pwidth);
394 }
#define TRUE
Definition: dbfopen.c:169
void rt_raster_destroy(rt_raster raster)
Release memory associated to a raster.
Definition: rt_raster.c:82
double rt_raster_get_x_scale(rt_raster raster)
Get scale X in projection units.
Definition: rt_raster.c:150
double rt_raster_get_y_skew(rt_raster raster)
Get skew about the Y axis.
Definition: rt_raster.c:190
rt_raster rt_raster_deserialize(void *serialized, int header_only)
Return a raster from a serialized form.
Definition: rt_serialize.c:725
raster
Be careful!! Zeros function's input parameter can be a (height x width) array, not (width x height): ...
Definition: rtrowdump.py:121
Struct definitions.
Definition: librtcore.h:2250

References rtrowdump::raster, rt_raster_deserialize(), rt_raster_destroy(), rt_raster_get_x_scale(), rt_raster_get_y_skew(), and TRUE.

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