I downloaded the DEM data from USGS. It comes with several raster files in .img. I know that a mosaic tool can merge them together. I found a lot of tools in the mosaic toolset.
Which one should I use?
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It only takes a minute to sign up.Sign up to join this community
You are on the right track, but you don't want to use the tools in the Mosaic folder. Instead, using ArcToolbox navigate to "Mosaic to New Raster".
Arc Toolbox > Data Management Tools > Raster > Raster Dataset > Mosaic to New Raster
All of the files you are manipulating should have the same cell size because they are all from USGS, but I would double check prior to using the mosaic tool by looking at the properties of each of your layers.