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I'm starting work on integrating the new SRTM Global 1 arc sec and 3 arc sec data sets. These are available from the USGS EarthData server and requires (free and open) credentials to access. srtm.py will need to be supplied a U/N and P/W to pull those tiles. I am unable to find an authentication-free copy like the SRTM version 2.1 tiles.
The new data sets have the same coverage areas as the previous datasets, but are now 100% void free and have the 1 arc second sampling size over the entire coverage area. The 1 arc second tiles are around Nyquist frequency near the equator, but oversampled at more extreme latitudes (~4x oversampling)
Changes:
Currently, saved tiles in cache and memory do not save the source information (like 1 arc vs 3 arc). If a previously cached tile uses the 3 arc second grid, and the current instance wants 1 arc second grid the behavior is to just load the 3 arc second grid tile. The saved tiles will need to have source information saved with them.
The interface for selecting datasets will need to change. I suggest the srtm1 and srtm3 parameters get deprecated and dataset(string of type) and fallback(boolean) get added for a more extensible and cleaner interface
The dictionary for URLs has lots of duplicated information. I suggest a format change: the tilename could be the key "N00E000" and it would return a tuple or namedTuple of (Region, in1arcSRTMv21, in3arcSRTMv21, inSRTMv3)
A new interface for supplying credentials will have to be added
Travis will need to have secret environment variables set with the UN and PW for CI testing
Anyone that would like to suggest interface changes is welcome to comment.
The text was updated successfully, but these errors were encountered:
I'm starting work on integrating the new SRTM Global 1 arc sec and 3 arc sec data sets. These are available from the USGS EarthData server and requires (free and open) credentials to access. srtm.py will need to be supplied a U/N and P/W to pull those tiles. I am unable to find an authentication-free copy like the SRTM version 2.1 tiles.
The new data sets have the same coverage areas as the previous datasets, but are now 100% void free and have the 1 arc second sampling size over the entire coverage area. The 1 arc second tiles are around Nyquist frequency near the equator, but oversampled at more extreme latitudes (~4x oversampling)
Changes:
Anyone that would like to suggest interface changes is welcome to comment.
The text was updated successfully, but these errors were encountered: