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I am using the ESA open scientific data hub for Sentinel 1 SAR imagery (Interferometric Wide swath SLC VV polarization) and would like to know how to perform vegetation health analysis from this data? What tools are available for this using ESA's SNAP open source software?

  • You probably need to be more specific in how you define vegetation health. With optical data, red and NIR ratios tend to be used as measures of productivity at the leaf level (e.g., NDVI). From SAR you will get different information on larger scale structure as well as moisture. From this you could look at things like height, density of foliage and water content. Lots of literature available on these, not sure on available tools though. – danclewley Aug 19 '16 at 6:35
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No way to calculate NDVI from SAR imagery, like Sentinel-1 images(any polarisations). To calculate NDVI you could get 2 bands (Near Infrared and Red bands) from Sentinel-2 or Landsat-8.

So, about SAR. You just only can get some value about biomass or LAI (Leaf Area Index) and after that you can try to search some formulas to indexing vegetation for specific fields, agricultural, forests or something else.

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