calculate_overview_factor()

raster2pgsql.calculate_overview_factor	(		ds,
			overview
	)

Definition at line 499 of file raster2pgsql.py.

def calculate_overview_factor(ds, overview):
    assert ds is not None
 
 
    # Assume all bands have same layout of overviews        
    band = ds.GetRasterBand(1)
    assert band is not None
    assert overview < band.GetOverviewCount()
    
    ov_band = band.GetOverview(overview)
    assert ov_band is not None
    
    ovf = int(0.5 + ds.RasterXSize / float(ov_band.XSize))
    logit('MSG: Overview factor = %d\n' % ovf)
 
    return ovf