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Crop Agriculture

Image-Based Atmospheric Correction Background & Current Recommended Methods

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BACKGROUND

About Atmospheric Scatter

Chavez (1988) Original Landsat TM Base of Histogram DOS Scatter Reflectance Method

Dark Object Examples

Landsat 8 Lowest Valid Value Attribute Table Method

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CURRENT RECOMMENDED LANDSAT 8 & SENTINEL-2 ATMOSPHERIC SCATTER ESTABLISHMENT METHODS FOR ARCGIS & QGIS USERS

As is explained in the links that follow and in the tutorials, it is recommended that .008 is deducted from the scatter reflectance established by the methods so that it has a reflectance of .008 as opposed to zero (this is only slightly different than the Chavez [1996] .01 deduction method which was applied because of "the fact that very few targets on the Earth's surface are absolute black, so an assumed one-percent minimum reflectance is better than zero percent" [Chavez, 1996]), and also that the red band is used as starting scatter for relative scatter for other bands.

ArcGIS Users for Landsat 8 & Sentinel-2: Frequency 50 Attribute Table Method

Free QGIS Users for Landsat 8: Bin 5 Method

Free QGIS Users for Sentinel-2: QGIS Base of Histogram Scatter Method

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SCATTER CALCULATORS & LOOKUP TABLES

Landsat 8 & Sentinel-2 Relative Scatter Calculator & Lookup Table

Landsat 4, 5, and 7 Relative Scatter Table

 

References

Chavez, P.S., Jr. 1996. Image-based atmospheric corrections–revisited and improved. Photogrammetric Engineering and Remote Sensing 62(9): pp.1025-1036.

Chavez, P.S., Jr. 1988. An improved dark-object subtraction technique for atmospheric scattering correction of multispectral data. Remote Sensing of Environment 24: pp.459-479.