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What is the spatial extent domain for the different file formats of 30" GRUMPv1 Urban Extent Grid?

Below are the spatial extent domains for the 30" resolution GRUMPv1 Urban Extents Grid for ASCII, .BIL and GRID:

ASCII:
West longitude -180.000000
East longitude 179.999856
South latitude -56.000000
North latitude 83.999944

GRID:
West longitude -180.000000
East longitude 180.008333
South latitude -57.000000
North latitude 84.000000

BIL:
West longitude -180.000000
East longitude 179.999856
South latitude -56.000000
North latitude 83.999944

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