calculate_overviews()

def raster2pgsql.calculate_overviews	(		ds,
			band_from = None,
			band_to = None
	)

RASTER OPERATIONS.

Definition at line 478 of file raster2pgsql.py.

def calculate_overviews(ds, band_from = None, band_to = None):
    assert ds is not None
 
    if band_from is None:
        band_from = 0
    if band_to is None:
        band_to = ds.RasterCount
 
    assert band_to <= ds.RasterCount,'Failed checking band_to=%d <= RasterCount=%d' % (band_to,ds.RasterCount)
    assert band_from <= band_to
 
    nov = 0
    for i in range(band_from, band_to + 1):
        n = ds.GetRasterBand(i).GetOverviewCount()
        if 0 == nov:
            nov = n
        assert n == nov, 'Number of raster overviews is not the same for all bands'
 
    return nov