Why GIMMS NDVI3g NDVI Values are out of Range (Not in between -1 to +1)?

I am trying to measure GPP. I am using GIMMS NDVI3g data.When I was process data with Matlab, The NDVI values is displaying a range much beyond the limits ( above 10000 and below -3000). What...

02 September 2018 1,211 5 View