Image smoothing

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Asked 5 years ago

Modified 5 years ago

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I have 9 layer stacked DEM raster image in .tif format. I would like to smooth the image using focal() function in raster package in R.

img <- brick("/stack.tif")
img <- focal(img, w=matrix(1,4,4), fun=modal)

Getting this error:

Error in (function (classes, fdef, mtable)  : 
  unable to find an inherited method for function ‘focal’ for signature ‘"RasterBrick"’

asked Nov 15, 2019 at 7:19

Sher

8945 silver badges22 bronze badges

You can't run focal over anything with more than one band. You have 9 bands. Do you want to run that operation on each band separately? Loop over the bands?
– Spacedman
Commented Nov 15, 2019 at 7:58
Do you want to reduce the multiple layers to one getting the mode for each pixel from the "above" or do you want to have a focal image for every single layer?
– loki
Commented Nov 22, 2019 at 7:10

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