I know the USGS and many others offer free downloadable raster topo maps for almost anywhere. But what if I want vector maps using GPS coords? I'm new to GIS but I would assume there is a de facto ...
This answer recommends topographic maps as downloadable from the USGS. A comment holds that those are definitely the best thing for the US. An except for the San Joaquin river near Mammoth Lakes ...
Does anyone know of a good way to find topographical maps for either download or purchase?