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Élévation relative de la surface de l'eau RWSE RSE WSE

PaulHuffman

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Tout le monde semble parler récemment de l'élévation relative de la surface de l'eau, mais je n'arrive pas à trouver les bons termes de recherche pour en savoir plus sur la façon dont cela est fait. Je comprends l'idée de base selon laquelle on soustrait une grille d'élévations du cours d'eau de l'élévation de la surface terrestre sus-jacente et on obtient une grille qui devrait montrer où le cours d'eau pourrait percer pour créer un nouveau chemin de cours d'eau. Mais comment extrapoler correctement l'élévation d'un cours d'eau sous les berges ? L'élévation du cours d'eau est-elle toujours appropriée tout au long d'une ligne perpendiculaire au cours d'eau ? Et que fait-on dans les méandres où les perpendiculaires se croisent ?<\/P>

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Le sujet que je veux rechercher est-il HAWS, pour Height above Water Surface ? <\/P><\/BODY><\/HTML>

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PaulHuffman

I found a link to the Great Basin Landscape Ecology Lab that has a link to Riparian Topology Toolbox which is a link back to the old ESRI ArcScripts web page. But a search of this current Geonet thing doesn't find its way back to the old Arc Scripts and there hasn't been a good replacement yet.

The toolbox was designed to run in Desktop 9.1 to 9.3. So far I haven't been able to get useful results by running this in Desktop 10.2.2

PaulHuffman

The author of the tools, Thomas Dilts, had some good suggestions for me.

I created a new map project with just the pertinent rasters in it. Set the units in the kernel densities to square map units. Clipped the bare earth raster and the stream raster to a small area of interest and sent to the output to a new file geodatabase on the C: drive rather than the SCSI external RAID where the whole rasters were stored. Then ran the 10.1 model, and I got good looking results in 29 minutes. Good looking except I have some -74 results in the output grid.

So I changed too many things at the same time to be able to narrow down the cause of the earlier failures.

GerryGabrisch

Paul,

Here is a link to a number of tool to create relative surface models. There are tools to detrend by transects, Euclian planes, Voronoi polygons...

I would give detrend by transect a try first.

White if you have troubles or questions.

ftp://lnnr.lummi-nsn.gov/GIS_Scripts/DetrendingTools.zip

GerryGabrisch

Oh, and about the elevation under stream bank problem. Unless you know where these areas are and surveyed them and created a new surface model based on these data you are out-of-luck and stuck with the original surface model.

PaulHuffman

Where did you get these?

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