As I am working behing a strict company proxy, from time to time I face large problems to make SNAP work. For this reason, I have implemented a manual download of S1 orbits, in which the proxy settings are properly considered. In the same line, I would like to download the DEMs manually for processes such as Terrain-Correction. My question is, where can I get these files?. At least the tipical DEMs used for Sentinel-1 - SRTM 3 sec, 1 sec, etc.
There are other use cases that would benefit from a simple process to download data files: people working on ships or remote field sites but also need to do some work with SNAP, and air-gapped systems. Maybe an “offline” mode could replace the download attempt with a recorder to generate a list of URL’s to be downloaded along with their target locations. There may be a way outside SNAP to record the URL’s, but currently SNAP experiences timeout timeout delays and processing failures.
I may be mistaken, but I assume that many auxiliary file downloads are for specific times or areas, so only a few files from a DEM repository with global coverage are actually downloaded. These DEM URL’s are helpful, but a user would need to figure out which files cover their region-of-interest.
dem_autoload looks very useful, but not easily discoverable. It might be good to have a document for “offline use cases” to collect offline upgrading and offline DEM downloads and extra detail (not everyone is familiar with .vrt files).