I have two raster layers that I would like to add together (
raster1+raster2) but although they have the same resolution(15x15 nautical miles), they are not perfectly overlapping because they have been created using two different grids and cropped at the end using the same polygon. One is the result of a Utilisation Distribution evaluation via the
adehabitatHR package for R and the other is the result of a longer procedure which includes R for data gathering and analysis, ArcMap 10.4 for spline interpolation with barriers and QGIS for further editing/geoprocessing.
I have looked at different proposed solutions via ArcMap (e.g. https://community.esri.com/thread/22270), R (e.g. Sum rasters with different extent in R) but none of them seems to work for me. Two of my rasters can be downloaded from https://www.dropbox.com/sh/aq746s58hbgerru/AADci-IGR1bgqIFWKQkOY7ata?dl=0. I have several rasters, about 120, that cover 10 different areas. And Ideally I would like an automated way to “snap” one to the other by area.
I have actually found a solution very easily by using the basic raster calculator in QGIS. For some reasons the SAGA and GDAL raster calculators were not producing an output while the basic QGIS one works fine. Furthermore I was using an older version of QGIS that I still prefer to the newest 3.x and this prevented me from using the basic raster calculator in a model. So, in other words, I just opened my project in QGIS 3+ and put the raster calculator in a model. This works fine with me.