Add an all_valid() masking function.

mapbox / nodata

Because the pixels you can't see are harder than the ones you can.

MIT License

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Add an all_valid() masking function. #28

Closed sgillies closed 8 years ago

sgillies commented 8 years ago

Partly for testing and partly for the object holding NodataPoolMan. It'll be called to quick mask windows that are far enough (measure to be determined) from the messy nodata edges of imagery.