FME requires SRTM HGT files to have specific filenames in order to read them. Since these files do not contain typical georeferencing information, this information is inferred from the filename.
The format for the filename is “abbcddd.hgt”, where:
- a indicates the northern (“N” or “n”) or the southern (“S” or “s”) hemisphere;
- b is the two-digit latitude in the given hemisphere;
- c indicates the western (“W” or “w”) or the eastern (“E” or “e”) hemisphere;
- d is the three-digit longitude in the given hemisphere.
Examples of correct filenames include N55E002.hgt, s01w135.hgt, n42W62.hgt.
FME considers a single SRTM HGT file to be a dataset.