Hello everyone,
I am quite new to ArcGIS so this may be simple, but I just cannot find the right answer to this.
I have two rasters (.tif) that I have derived from Sentinel images. One is a raster with land use classification derived from training sample data and Supervised Classification at 10 m resolution. It has 5 classes (buil-up/bare, forests, mining pits, croplands/grasslands, and cloud cover). I have also computed the MNDWI for each raster cell based on green and SWIR bands at 20 m resolution.
I have noticed that in the LU raster, it has wrongly classified water bodies as either cropland or forest. I want to correct this by assigning values in the LU layer that are cropland or forest as water bodies where the MNDWI is higher than 0.4. I have tried overlays, selection by attributes, and the raster calculator in various forms, but I keep getting error messages. The conditionals I use in the raster editor (e.g. something like: water = ("LU.tif" == "cropland") & ("mndwi.tif" >= 0.4) do not compile. I feel like I am missing something very obvious.
I was able to extract the water bodies using watbod = "mndwi.tif" >= 0.4, but now I cannot use it to extract the relevant cells in the cropland/forest LU layer - I can often compile, but then get a layer with results spanning 0 to 0.
Is this because of the differing resolutions? Where am I failing here?
One additional note: I often also encounter the error notice: "The truth value of a raster is ambiguous. Invalid use of raster with Boolean operator or function." In this case, I had tried variations of watbod_new = "LU.tif" == "cropland" & "watbod" == 1, with watbod = 1 being the extracted waterbodies. Adding parentheses resulted in a raster with the value being 0 everywhere.
