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Landsat Missions

Frequently Asked Questions about the Landsat Missions

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Question:
If gap mask files are not provided with the data, can I create my own?

Answer:

Yes. Since pixels with missing data have digital number (DN) values of 0, you can differentiate between valid and missing data pixels using a number of different remote sensing software packages. A gap mask can then be created to show where valid and missing data pixels are located.

The process used to create a gap mask using ENVI is shown below. (Please note that this does not signify an endorsement by USGS EROS, as we cannot endorse any specific remote sensing software. Other remote sensing software packages may also contain similar functionality.)

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