rt_band_get_pixel_resample()

rt_errorstate rt_band_get_pixel_resample	(	rt_band	band,
		double	xr,
		double	yr,
		rt_resample_type	resample,
		double *	r_value,
		int *	r_nodata
	)

Retrieve a point value from the raster using a world coordinate and selected resampling method.

Parameters

band	: the band to read for values
xr	: x unrounded raster coordinate
yr	: y unrounded raster coordinate
resample	: algorithm for reading raster (nearest or bilinear)
r_value	: return pointer for point value
r_nodata	: return pointer for if this is a nodata

Returns

ES_ERROR on error, otherwise ES_NONE

Retrieve a point value from the raster using a world coordinate and selected resampling method.

Parameters

band	: the band to read for values
xr	: x unrounded raster coordinate
yr	: y unrounded raster coordinate
r_value	: return pointer for point value
r_nodata	: return pointer for if this is a nodata

Returns

ES_ERROR on error, otherwise ES_NONE

Definition at line 1372 of file rt_band.c.

{
        if (resample == RT_BILINEAR) {
                return rt_band_get_pixel_bilinear(
                        band, xr, yr, r_value, r_nodata
                        );
        }
        else if (resample == RT_NEAREST) {
                return rt_band_get_pixel(
                        band, floor(xr), floor(yr),
                        r_value, r_nodata
                        );
        }
        else {
                rtwarn("Invalid resample type requested %d", resample);
                return ES_ERROR;
        }
 
}

References ovdump::band, ES_ERROR, rt_band_get_pixel(), rt_band_get_pixel_bilinear(), RT_BILINEAR, RT_NEAREST, and rtwarn().

Referenced by RASTER_getPixelValueResample(), and rt_raster_copy_to_geometry().

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