voltar para o site MapBiomas

Zonal statistics at municipality level


#1

Hello,

I am working with the collection 3.1 zonal statistics dataset at the municipality level, which is provided under Downloads. In a sample of 525 Amazon municipalities, I find the following pattern: For each of these municipalities, for at least one year, say t, the area under “natural forests” (land cover id 2 as per collection 3.1) increases in t+1 and then decreases in t+2. I am confused as to why this is happening. As per my understanding, this should not happen - especially because, as per the methodology documentation, such transitions were corrected for in post-classification. Any explanations for why this is happening would be very useful.

Thank you!


#2

There are several possibilities for that to happen in long time series such this one in Collection 3.1. For example, a fire or degradation event in one year that is recovered; heavy log in one area; regeneration followed by a clear cut of a secondary forest; It has to be analysed case by case.

The temporal filter correct the changes (Natural Forest > XXX > Natural Forest) happen in the same pixel.

all the best.


#3

I see. Thank you for your help.
Just to be sure, something like Natural Forest > XXX > XXX > Natural Forest is allowed?


#4

Yeah. Something like Natural Forest > XXX > XXX > Natural Forest is allowed in Amazon Biome.