Making Sense of Satellite Data, An Open Source Workflow: Stitching Data with QGIS

Boston in the summer. SkySat data collected on July 30, 2017. Image ©2018 Planet Labs, Inc. CC-by SA 4.0.
SkySat
  1. Each scene (SkySat data is served as individual scenes that together make up a collect) is contrast-stretched separately by QGIS. That means the darkest and lightest pixels in each separate chunk of data are displayed as black and white, instead of the darkest and lightest pixels out of the entire collect. This gives a patchwork appearance.
  2. The bands are in the wrong order. By convention satellite data is ordered from shortest wavelength to longest; but image files are ordered red, green, blue.

Data Visualization, Planet Labs. Ex-NASA. Blue Marble, Earth at Night, color.

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Robert Simmon

Robert Simmon

Data Visualization, Planet Labs. Ex-NASA. Blue Marble, Earth at Night, color.

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