Timeline for Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Dec 16, 2015 at 12:37 | comment | added | If you do not know- just GIS | Tau dem had multi processor capability as well | |
| Oct 3, 2014 at 13:18 | comment | added | reima | Check out SAGA GIS-softaware too. I'd like to point out that this IS NOT A DEM RELATED issue as the information (that is x,y,z) is always the same in each of the different flow accumulation METHODS (that is D8, Dinfinity, etc .. ). Parrallel processing found in SAGA GIS allows rather fast processing of lidar data, too. I have used these methods to quite large calculations and they worked well. The thing is, that you preprocess your data properly. I.e. burn drainage structures (culverts, bridges) and fill them and THEN make the flow accumulation calculations! | |
| Jan 16, 2013 at 20:00 | comment | added | Jeffrey Evans | I will second this! The D8 flow direction will yield undesirable results on high resolution data where as TauDEM has D-infinity flow direction available. Also, keep in mind the intent of a hydrological flow model. Bigger is not always better (resolution wise). A ultra high-resolution DEM is more your problem than the model. Lidar derived DEM's inherently have real "noise" that was never intended for use in a flow model. I would highly recommend downscaling your DEM. | |
| May 27, 2011 at 16:10 | history | edited | SaulBack | CC BY-SA 3.0 |
added 594 characters in body
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| May 27, 2011 at 14:28 | history | answered | SaulBack | CC BY-SA 3.0 |