multiple rasters && mapview

[Russell Nelson]

Jonathan Coles writes:
 > i'm attaching another version of the diffs which include the changes.

Doesn't work for me.  The map is rendered with the wrong colors and
flipped top for bottom.  I suspect GetImageData is the guilty party.
Here's the dataset (137KB):

http://russnelson.com/potsdam-railroads.tar.gz

On the plus side, it generates wrong results MUCH faster.  :-)

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