I am a hydrologist and their are 2 important pieces of information I need for modeling. I need to know the longest flow path for each sub catchment in my area of interest and I need to know the elevations of points specific distances along those paths.
As an example, I may have a shapefile with specific boundaries that represent my catchment and an elevation raster. I would like to be able to determine the longest path that water flows in each of these defined areas. Once I have a shape file containing the longest flow paths for each catchment, I would like to find the elevation at 10% and 90% the length of each flow path and the distance between each point.
I have not found either of these functions in anything except the ArcHydro tool bar for ArcGIS. I know that the individual tools for creating these things exist in Qgis ( through SAGA and GRASS ) but I am new to python and not a programer in any respect. I am hoping these tools are in an existing package and I am just too new to qgis/grass/saga to find them. Any help would be greatly appreciated.
edit:When I mentioned that I was new to Qgis, I meant I have only been using it for about 18 months so I have some idea what I am doing.
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As an example, I may have a shapefile with specific boundaries that represent my catchment and an elevation raster. I would like to be able to determine the longest path that water flows in each of these defined areas. Once I have a shape file containing the longest flow paths for each catchment, I would like to find the elevation at 10% and 90% the length of each flow path and the distance between each point.
I have not found either of these functions in anything except the ArcHydro tool bar for ArcGIS. I know that the individual tools for creating these things exist in Qgis ( through SAGA and GRASS ) but I am new to python and not a programer in any respect. I am hoping these tools are in an existing package and I am just too new to qgis/grass/saga to find them. Any help would be greatly appreciated.
edit:When I mentioned that I was new to Qgis, I meant I have only been using it for about 18 months so I have some idea what I am doing.
أكثر...