wkblify_raster()

raster2pgsql.wkblify_raster	(		options,
			infile,
			i,
			previous_gt = None
	)

Writes given raster dataset using GDAL features into HEX-encoded of
WKB for WKT Raster output.

Definition at line 916 of file raster2pgsql.py.

def wkblify_raster(options, infile, i, previous_gt = None):
    """Writes given raster dataset using GDAL features into HEX-encoded of
    WKB for WKT Raster output."""
    
    assert infile is not None, "Input file is none, expected file name"
    assert options.version == g_rt_version, "Error: invalid WKT Raster protocol version"
    assert options.endian == NDR, "Error: invalid endianness, use little-endian (NDR) only"
    assert options.srid >= -1, "Error: do you really want to specify SRID = %d" % options.srid
 
    # Open source raster file
    ds = gdal.Open(infile, gdalc.GA_ReadOnly);
    if ds is None:
        sys.exit('Error: Cannot open input file: ' + str(infile))
 
    # By default, translate all raster bands
 
    # Calculate range for single-band request
    if options.band is not None and options.band > 0:
        band_range = ( options.band, options.band + 1 )
    else:
        band_range = ( 1, ds.RasterCount + 1 )
 
    # Compare this px size with previous one
    current_gt = get_gdal_geotransform(ds)
    if previous_gt is not None:
        if previous_gt[1] != current_gt[1] or previous_gt[5] != current_gt[5]:
            sys.exit('Error: Cannot load raster with different pixel size in the same raster table')
 
    # Generate requested overview level (base raster if level = 1)
    summary = wkblify_raster_level(options, ds, options.overview_level, band_range, infile, i)
    SUMMARY.append( summary )
    
    # Cleanup
    ds = None
 
    return current_gt