PostGIS  2.2.7dev-r@@SVN_REVISION@@
Datum RASTER_getPixelHeight ( PG_FUNCTION_ARGS  )

Definition at line 402 of file rtpg_raster_properties.c.

References rtrowdump::raster, rt_raster_deserialize(), rt_raster_destroy(), rt_raster_get_x_skew(), rt_raster_get_y_scale(), and TRUE.

403 {
404  rt_pgraster *pgraster;
406  double yscale;
407  double xskew;
408  double pheight;
409 
410  if (PG_ARGISNULL(0)) PG_RETURN_NULL();
411  pgraster = (rt_pgraster *)PG_DETOAST_DATUM_SLICE(PG_GETARG_DATUM(0), 0, sizeof(struct rt_raster_serialized_t));
412 
413  raster = rt_raster_deserialize(pgraster, TRUE);
414  if (!raster) {
415  PG_FREE_IF_COPY(pgraster, 0);
416  elog(ERROR, "RASTER_getPixelHeight: Could not deserialize raster");
417  PG_RETURN_NULL();
418  }
419 
420  yscale = rt_raster_get_y_scale(raster);
421  xskew = rt_raster_get_x_skew(raster);
422  pheight = sqrt(yscale*yscale + xskew*xskew);
423 
424  rt_raster_destroy(raster);
425  PG_FREE_IF_COPY(pgraster, 0);
426 
427  PG_RETURN_FLOAT8(pheight);
428 }
tuple raster
Be careful!! Zeros function's input parameter can be a (height x width) array, not (width x height): ...
Definition: rtrowdump.py:121
void rt_raster_destroy(rt_raster raster)
Release memory associated to a raster.
Definition: rt_raster.c:82
double rt_raster_get_y_scale(rt_raster raster)
Get scale Y in projection units.
Definition: rt_raster.c:159
double rt_raster_get_x_skew(rt_raster raster)
Get skew about the X axis.
Definition: rt_raster.c:181
Struct definitions.
Definition: librtcore.h:2213
#define TRUE
Definition: dbfopen.c:169
rt_raster rt_raster_deserialize(void *serialized, int header_only)
Return a raster from a serialized form.
Definition: rt_serialize.c:717

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