[Gdal-dev] when are overviews displayed for a 6 inch geotiff that has gdaladdo -r average file.tif 2 4 8 16 32 64 128

[Frank Warmerdam]

John Mitchell wrote:
> Frank,
> 
> Thanks for the information.  I am creating external overviews and would 
> like to use the same algorithm that you described below for internal 
> overviews.  If I would like an overview to display if the overviews 
> resolution is no more than 1.2 times the requested resolution, then how 
> can I convert from resolution to scale so that my minimum scale within 
> mapserver for an overview matches the correct resolution?

John,

I'm sorry, but I've not really mastered how the scale numbers in mapserver
works.

Best regards,
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