Hi, I found following interesting Brasilian program called HydroFlow: http://www.fgel.uerj.br/labgis/hydroflow/en/downloads_ingles.html
This tools calculates the Stream order (e.g. Strahler, Shreve) based on a shapefile input of the river network and a shapefile that defines the border (catchment?). If I am informed correctly such a tool that does not require any form of a DEM (or accumulation map etc.) is not existing for GRASS yet. There are just two questions that appeared to me: 1) Has anyone installed and tried the programm already in Ubuntu/Linux? 2) The tool is licensed as open source. So, could such a algorithm also be implemented as a add-on to GRASS? I am not sure but I can imagine that this might be of interest also to other GRASS users!? /johannes
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