Vegetation Change Tracker and GEE: What bands are required?
Geographic Information Systems Asked on October 28, 2020
I’m hoping to use the GEE implementation of the Vegetation Change Tracker (VCT) algorithm here: https://developers.google.com/earth-engine/apidocs/ee-algorithms-temporalsegmentation-vct#javascript
I’m struggling to identify the band requirements for the timeSeries argument. The docs indicate the following:
- B3
- B4
- B5
- B7
- thermal
- NDVI
- DNBR
- COMP
Bands 1-6 are straight forward enough but 7 and 8 are confusing. DNBR (7) is differenced Normalized Burn Ratio I think, but I would expect to pass NBR for a time series… What is COMP (8)?
One Answer
Looks like the COMP is the composite z-score AKA Integrated Forest Z-Score (IFZ). Computed as follows (from Huang et al, 2010, RSE):
Where bi is any pixel from a band (b) and bi-hat is
Where NB is number of bands used.
https://groups.google.com/g/google-earth-engine-developers/c/g0mM92B4Y14/m/JVF5ve9_GQAJ
There are still lots of unclear bits in the documentation...The landcover map for example gives no indication of what landcover classes are required.
Correct answer by Lucas on October 28, 2020
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