Color Matching Example

ColorMatching | | NDVI

Landsat RGB false color, 15m
Modis RGB true color, 500m

Landsat images, even pan-sharpened images via linear regression, have a color shift. The color shift can be corrected by histogram matching, meaning that a false color image is matched with a true color reference image.

  • to match the histogram of both images a scale and offset factor is needed.
  • the scale and offset factors are determined via linear regression.

Usually the best true color reference is available from the Modis satellite. The Modis satellite has excellent image quality, but very low resolution, so it only serves as a reference for the higher-resolution Landsat imagery.

With that reference the pan-sharpened Landsat imagery is color-corrected as well:

Landsat RGB true color corrected, 15m

ColorMatching | | NDVI