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I'm trying to mask a raster with a ring polygon using the function raster::mask, but only recognizes the outer edges of the polygon, can anyone help me with this? I only need the pixels within the yellow area, but it returns pixel inside the outer edge of the polygon. 

library(raster)

raster<-raster("my_raster_path")  
buffer<-shapefile("my_shapefile_path") #yellow buffer

output<-mask(raster, buffer)
writeRaster(output, "filename") #output grayscale raster

I only need the pixels within the yellow area

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  • How about you divide the task in two steps? First the outer, then the inner clip?
    – Erik
    Commented May 22, 2019 at 14:33
  • Thanks Erik. How can I clip the inner section?
    – Claudia
    Commented May 22, 2019 at 14:36
  • I guess like the other operation, simply separate your mask into two parts.
    – Erik
    Commented May 22, 2019 at 14:37
  • can you post the code you are using?
    – GCGM
    Commented May 22, 2019 at 15:03
  • 1
    Can't do this without your data or something that shows the same problem.
    – Spacedman
    Commented May 22, 2019 at 17:16

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