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I am attempting to understand how NDVI values have changed at my study area over 32 years. More specifically, I need to evaluate how the NDVI value of each pixel has changed over 32 years. For this I need I have 32 Landsat image for which I have calculated NDVI, giving me 32 rasters of NDVI. My problem arises in trying applying the Mann-Kendall test on every pixel of my raster stack in R to produce 2 new rasters, one conveying the tau of each pixel and the other the p-value of each pixel.

I have attempted to convert my raster stack to dataframe and run the mann-kendall but have found no way to write to a new raster. I also tried to utilize the lapply function, but I don't believe that applies to rasters.

Any input into this is much appreciated.

Sohail
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  • Please, show your code about how you've tried to convert the data, and have a look at this: https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example – Ricardo Fernandes Campos Jan 13 '19 at 23:05

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