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I will be using this stuff for an MSc project where I am looking at changing EVI over a four year timeperiod in 4 sites in the Amazon to look at changing rodent species abundances.

I have got to the point where I am trying to perform the remote sensing part and have been accessing Landsat 8 raw data as it gives me better time resolution than MODIS.

I import my .TIF files into QGIS and run the Semi-Automatic Classification Plug In to get TOA correction (it produces the same values as when I previously did it manually) and corrects my values from 0-1.

The problem I get is when I try to produce the EVI either manually or through the GRASS i.vi process I get values that aren't constrained to the EVI bounds of -1 to 1.

I've looked at a few tutorials online and it seems that I'm following them I was just wondering if anyone may know where I'm going wrong.

The VI scores are shown on the right and as you can see they go from -98 (the border of the satellite image (still need to figure out how to remove this so I can merge two rasters) and 10.5

The VI scores are shown on the right and as you can see they go from -98 (the border of the satellite image (still need to figure out how to remove this so I can merge two rasters) and 10.5

If you need any further information or if this is a duplication of someone elses problem (I have read a lot of similar posts here) please let me know.

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