Need to estimate stream length index and am using SRTM Dem. The toolbox SLiX is used. However the model shows error. Can anyone suggest what mistake I am doing? Also if other toolbox are available?
'Error' covers a lot of ground, with thousands of possibilities.
The terms 'DEM', and 'SRTM' are very, but versions of those products is over twenty years now, with multiple versions being released with different processing levels, and all along various NGOs and other Communities of Interest creating their own derivatives, and then redistribution of those through various other portals and products (especially hydrological adjusted DEMs using various algorithms).
And it isn't only the data that is important, the metadata and documentation ( for example The 2020 NASDEM user guide https://lpdaac.usgs.gov/documents/1318/NASADEM_User_Guide_V12.pdf of note is section 5 NASADEM FINISHING) . So if there are 'errors' or 'inconsistencies' it is important to know the exact source.
For resolving those, one simply can't avoid reading, at what ever level of understand the documentation, Ex.for example (Note: NASA SRTM Version 3 is not to be confused with “SRTM Versions 3 and 4” produced by CGIAR as their own follow-on DEMs to the NASA JPL and NIMA/NGA produced SRTM Versions 1 and 2.).
And the most recent SRTM derived 'DEM' isn't just elevation data, it is a collection of datasets - slope, aspect angle, profile curvature and plan curvature products and various supporting information like source, scene count, error, etc. ( Table 2 NASADEM products and their groupings ). Any single one, or combination of these other layers might be useful resolving a situation for a particular use case, depending if I was interested in ridge lines versus flow direction, surface convolution, etc.).
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