test_gdal_warp_preserves_data()

static void test_gdal_warp_preserves_data ( void  )

static

Definition at line 536 of file cu_gdal.c.

                                                {
        const char *filename = POSTGIS_TOP_SRC_DIR "/raster/test/regress/loader/Projected.tif";
 
        GDALDatasetH hDS_in = NULL;
        rt_raster rast_in = NULL;
        rt_raster rast_out = NULL;
        int band_count_in, band_count_out, i;
 
        // double scale_x = 0.0, scale_y = 0.0;
        // double dim_x = 0.0, dim_y = 0.0;
        // int width = 0, height = 0;
        // double grid_xw = 0.0, grid_yw = 0.0;
        // double skew_x = 0.0, skew_y = 0.0;
 
        double max_err = 0.125;
        GDALResampleAlg alg = GRA_NearestNeighbour;
 
        const char *src_srs = "EPSG:4326";
        const char *dst_srs = "EPSG:3857";
 
        /* Handle to TIFF */
        GDALAllRegister();
        hDS_in = GDALOpen(filename, GA_ReadOnly);
        CU_ASSERT(hDS_in != NULL);
 
        /* Read TIFF into memory as rt_raster */
        rast_in = rt_raster_from_gdal_dataset(hDS_in);
        CU_ASSERT(rast_in != NULL);
 
        /* Warp raster using default options */
        rast_out = rt_raster_gdal_warp(rast_in,
            src_srs, dst_srs,
            NULL, NULL, // &scale_x, &scale_y,
            NULL, NULL, // &dim_x, &dim_y,
            NULL, NULL, // &width, &height,
            NULL, NULL, // &grid_xw, &grid_yw,
            NULL, NULL, // &skew_x, &skew_y,
            alg, max_err);
        CU_ASSERT(rast_out != NULL);
 
        band_count_in = rt_raster_get_num_bands(rast_in);
        band_count_out = rt_raster_get_num_bands(rast_out);
        CU_ASSERT_EQUAL(band_count_in, band_count_out);
 
        for (i = 0; i < band_count_in; i++) {
                double tolerance = 0.1;
                rt_bandstats stats_in, stats_out;
                rt_band band_in = rt_raster_get_band(rast_in, i);
                rt_band band_out = rt_raster_get_band(rast_out, i);
 
                CU_ASSERT(band_in != NULL);
                CU_ASSERT(band_out != NULL);
 
                stats_in = rt_band_get_summary_stats(band_in, 1, 1, 0, NULL, NULL, NULL);
                stats_out = rt_band_get_summary_stats(band_out, 1, 1, 0, NULL, NULL, NULL);
 
                CU_ASSERT_DOUBLE_EQUAL(stats_in->min, stats_out->min, fabs(stats_in->min) * tolerance);
                CU_ASSERT_DOUBLE_EQUAL(stats_in->max, stats_out->max, fabs(stats_in->max) * tolerance);
                CU_ASSERT_DOUBLE_EQUAL(stats_in->mean, stats_out->mean, fabs(stats_in->mean) * tolerance);
        }
 
        rt_raster_destroy(rast_in);
        rt_raster_destroy(rast_out);
        GDALClose(hDS_in);
}

References rt_bandstats_t::max, rt_bandstats_t::mean, rt_bandstats_t::min, rt_band_get_summary_stats(), rt_raster_destroy(), rt_raster_from_gdal_dataset(), rt_raster_gdal_warp(), rt_raster_get_band(), and rt_raster_get_num_bands().

Referenced by gdal_suite_setup().

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