calculate_overview_factor()

def raster2pgsql.calculate_overview_factor	(		ds,
			overview
	)

Definition at line 498 of file raster2pgsql.py.

References logit().

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
        
    

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