I have a land cover raster. I changed all the land cover values to 1 and 0. Now i want to change the raster values based on distance. Based on raster value 1, i want to change raster value of surronding raster until it reaches to 0. for example, if i have a cell value 1, all the sourrounding rasters value to 0.9 and in decreasing order by every cell to 0.8 and so on, if it is not already 0. How do i do that?