arcgis-10.2arcgis-desktopoverlayraster
I have two rasters (one showing land use and the other showing soil texture). I'd like to find the areas where there is a specific land use on a specific soil texture.
Is there a way to overlay two rasters but with a boolean statement or some kind of qualifier?
I have tried zonal statistics but each attribute table for my rasters have multiple columns and I only want to compare values between two of the columns (soil texture in one table and land use type in the other table).
If you have only two parameters and you know the influence of land use is more than the influence of slope and you can justify that in your analysis, then the equation is correct.
However, the only problem is that you cannot sum land use and slope directly even after assigning them weights because they have different units.
To apply weighted overlay analysis you need to standardize both land use and slope into a common scale, which means you should reclassify the pixel values of the two parameters using Reclassify Grid Values tool under SAGA tools in QGIS. There are many literatures about that in the internet you need to read about it. After reclassifying the old pixel values of both slope and land use parameters into new standard values, you can apply the equation in the raster calculator.
You now have a Area-Manning-Weighted mean column.
Best Answer
As Felix is unwilling to answer this I will have a go.
The tool to intersect two (integer) rasters is Combine which will merge the attributes of up to 20 rasters.
It is unclear from the tool help what happens to raster attributes other than value, should they be built, after running this tool but from the graphic it appears only the value will be copied to the new rasters' attribute table. If you have soil type or land use descriptions in the raster you may need to re-establish them using Add Field then join with the land use and soil types and copy the descriptions with calculate field.
It would be best for the output raster to be of the type Esri GRID if there are more than 255 values as the number of unique combinations between the rasters cannot exceed 65535.