marpet
June 16, 2021, 1:07pm
12
I would stick to 8 and 4. B5 is not in the red spectrum anymore. For NIR you have some freedom. Could be B8 or B9.http://www.met.rdg.ac.uk/~swsgrime/artemis/ch3/ndvi/ndvi.html (pvts.net) gives some insights.
Dear All,
I have been recently experiencing a hard time with NDVI values derived for Sentinel-2 scenes Level 2A (processed with Stand-alone Sen2Cor 2.4.0 with topographic correction).
My concern is that NDVI is a way too high than what I would expect for grassland/pasture land cover classes in winter/early-spring in Europe NW. Some areas are getting NDVI >0.9. The image looks ok, but the range is shifted towards the high end. I have been experiencing it for a several Sentinel-2 tiles acquired …
Also find sen2corr with too high NDVI Values, now that are available in GEE I share a plot in a grape-vineyard in Chile; crop coefficient models tell us that calculated Kcb (crop basal coefficient) should by in 0,7 to 1,2 range so this stills in range after conversion from NDVI… but the change is major (20% to 30% higher). so I was loking for a clue about, any?
[image]
I was guessing 3 theories:
1.- its just right… nothing to do
1.- LUTs that are used in sen2cor algth., for aerosol,atmosph…