bounding boxes

[Russell Nelson]

Jonathan Coles writes:
 > do all layers have bounding boxes? i would think so, but i just wanted
 > to check. if so, what are people's thoughts on adding BoundingBox and
 > LatLongBoundingBox into BaseLayer? both functions exist in Layer,
 > RasterLayer, and wmsLayer, and it would be nice to be able to assume
 > that all layers have these functions implemented in some way. 

The Terra layer won't have a small bounding box.  A reasonable
bounding box will be as tall as the United States and 3 degrees wide.
Depending on the definition of BoundingBox, and the way it's used, I
think that the best bounding box the Terra layer could return is None.

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