calculate_block_size()

raster2pgsql.calculate_block_size	(		ds,
			band_from,
			band_to
	)

Size of natural block reported by GDAL for bands of given dataset

Definition at line 542 of file raster2pgsql.py.

def calculate_block_size(ds, band_from, band_to):
    """Size of natural block reported by GDAL for bands of given dataset"""
 
    block_dims = None
    for i in range(band_from, band_to):
        band = ds.GetRasterBand(i)
        assert band is not None, "Cannot access raster band %d" % i
        dims = band.GetBlockSize()
 
        # Assume bands with common block size
        if i == band_from:
            block_dims = dims
 
        # Validate dimensions of bands block
        if block_dims != dims:
            logit("MSG: Block sizes don't match: %s != %s\n" % (str(block_dims), str(dims)))
    
    assert block_dims is not None, "Failed to calculate block size"
    return (int(block_dims[0]), int(block_dims[1]))