I need elevation data with lat and long for a project worldwide. By intuition I would say that a GeoTiff would be suitable, e.g. the one from https://asterweb.jpl.nasa.gov/gdem.asp.
Are there better ones, or does this one not contain any elevation data? Does anyone know where there are open source Geotiffs that are good? Or are there open source CSV files that contain the required information, or similar?
ps. I only need the surface data from the mainland, not from the oceans.