RASTER_getPixelHeight()

Datum RASTER_getPixelHeight

(

PG_FUNCTION_ARGS

)

Definition at line 402 of file rtpg_raster_properties.c.

References PG_FUNCTION_INFO_V1(), rtrowdump::raster, RASTER_getGeotransform(), rt_raster_deserialize(), rt_raster_destroy(), rt_raster_get_x_skew(), rt_raster_get_y_scale(), and TRUE.

Referenced by RASTER_getPixelWidth().

{
    rt_pgraster *pgraster;
    rt_raster raster;
    double yscale;
    double xskew;
    double pheight;

    if (PG_ARGISNULL(0)) PG_RETURN_NULL();
    pgraster = (rt_pgraster *)PG_DETOAST_DATUM_SLICE(PG_GETARG_DATUM(0), 0, sizeof(struct rt_raster_serialized_t));

    raster = rt_raster_deserialize(pgraster, TRUE);
    if (!raster) {
        PG_FREE_IF_COPY(pgraster, 0);
        elog(ERROR, "RASTER_getPixelHeight: Could not deserialize raster");
        PG_RETURN_NULL();
    }

    yscale = rt_raster_get_y_scale(raster);
    xskew = rt_raster_get_x_skew(raster);
    pheight = sqrt(yscale*yscale + xskew*xskew);

    rt_raster_destroy(raster);
    PG_FREE_IF_COPY(pgraster, 0);

    PG_RETURN_FLOAT8(pheight);
}

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