7
votes
Accepted
How do optical satellites detect different leaf types?
Short answer
Different plants reflect light at different wavelengths with specific patterns. If you know the reflection pattern of a broad-leaved forest and that of a needle-leaved forest, you can ...
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5
votes
How do optical satellites detect different leaf types?
In general, no, NDVI is not used to derive vegetation type. NDVI is useful for studying phenology, but it won't tell you the type of plant that is being remotely sensed. Good land cover systems use ...
- 12.7k
5
votes
Accepted
MODIS Surface Reflectance Data State QA Aerosol Quantity field meaning is unclear
Most likely, climatology means there was no retrieval at all.
Bayesian retrievals combine information from an a priori with information from measurements. When the retrieval fails for whatever ...
- 11.1k
2
votes
MODIS Surface Reflectance Data State QA Aerosol Quantity field meaning is unclear
Gerrit is correct, the climatological setting indicates that the value is filled in (not an actual retrieval). If you see the MODIS Vegetation Index User’s Guide, it is discussed a few times:
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- 12.7k
1
vote
Accepted
How to get single value of NDVI value from four different directions?
After given some information about the data source I have a simple answer. Since the underscores SW etc. represent the four pixels around the city center and all the pixels cover the same physical ...
- 1,043
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