[osterwald]

Was it not supposed to be exportable with the hybrid-option?

As I could read it here (http://hecrasmodel.blogspot.com/2016/10/creating-static-results-maps-shapefiles.html), someone reported the bug to the development team and got this reponse in 2016:

“Thank you for reporting this problem. I have been able to reproduce the issue here with a separate dataset and have submitted the bug to our development team. The bug should be corrected in the next HEC-RAS release.”

But unfortunately it was not be fixed.

I reported it again at the middle of april but no response until now.

[osterwald]

export out the cell center as a point shapefile, assign a WSE to each cell center, then create a wse raster from the points. You can then subtract your terrain from the WSE to get a sloping surface.

To help, set the depths at which it displays from 0.001 (default) to -9999.

Thank you very much. I did it but it doesn’t change the fact that fragmented inundation areas will still exist.

Anyone has any idea about the interpolation algorithmus behind the sloping render method?
Or did anybody has some success in exporting the depth using “hybrid render method”? For me it doesn’t work and just give me the old sloping values. 🙁

[osterwald]

I will have to double check, but I believe it calculates the WSE for each cell and back calculates the depth from that and the terrain.

Yes it is as far as I could figure it out!

But my problem is that i have a 25 m calculation mesh over 5 m terrains so if I use the horizontal render mode it will show many fragmented inundations. The sloping render mode will just overestimated the depth at the borders to higher elements in the terrain. The hybrid mode’s export function does’nt work so I would like to know which algorithmus is behind the sloping mode so I could implement it myself to get the desired output.

[osterwald]

Hi, did anybody get some progress on mapping depth to terrain.
I would love to know which algorithmus is being used for sloping rendering mode (interpolated values)?

[osterwald]

Do you have any progress on this?

[osterwald]

Hi,

do you have any progress on this?
I am trying to create the depth map myself and am wondering the same questions like yours.

Until now I could export the computational points with the depth in hdf5 but the depth is based on the minimum elevation of the cell (cell 25 m based on 5 m terrain) so I assume the better way should be we average the elevations for 1 cell, then use the WSE to substract the averaged heights?

Again, if anybody knows how HEC-RAS interpolates the depths for sloping rendering option I would very thankful to know.

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