The unusable data mask file provides information on areas of unusable data within an image (e.g. cloud and non-imaged areas).
The pixel size after orthorectification will be 50 m for RapidEye, Each bit in the 8-bit pixel identifies whether the corresponding part of the product contains useful imagery:

  • Bit 0: Identifies whether the area contains blackfill.
  • Bit 1: Identifies whether the area is cloud covered.
  • Bit 2: Identifies whether the area contains missing (lost during downlink)or suspect (contains down- link errors)

and so all bits have their responsibilities. I want to read the Bit 1 of a pixel in UDM file.

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