Terrain Association

[Bill Buckley]

I am creating a very simple 2D project and continue to get “Cannot recompute 2D property tables – no terrain associated with this geometry”.
The terrain and projection are set and match with imagery
The geometry file was created first in the geometry editor before being created in RAS-MAPPER
The geometry is associated with the terrain.
I’ve tried different terrain data sets and projections with the same results.
I have closed and reopened HEC-RAS. I have closed and reopened by computer. I have tried it on different computers.
I have completely rebuilt the project in a new file.
I’m thinking that there is a setting in my model that is not letting the geometry and terrain associate within the plan.

Any thoughts?

[Luis Partida]

I bet you have a red cell error that is not being shown in RAS Mapper. I still refuse to build out geometries in RAS Mapper as it is still buggy. Open the geometry data editor with RAS Mapper closed, then check the bottom left for a red message saying there is a cell with more than 8 sides and either fix it with a breakline or manual edit.

The other option I would suggest is to rebuild it again in a fresh environment and do not use RAS Mapper for anything

[Eric R]

Bill, Have you tried creating this geometry first in RAS Mapper and then populating it in the geometry editor?

[Bill Buckley]

Thank you Luis and Eric. There was no error message for a cell with more than 8 sides. I’ve tried both suggestions in completely new builds
and still getting the same error message. Very disheartening.

[Eric R]

What is the average cell size of your model?

[Bill Buckley]

10397.64

[Eric R]

Do you mean that each cell in your model has an average dimension of 10397 ft?

• This reply was modified 11 months ago by Eric R.

[Bill Buckley]

Cell sizes are 100′ x 100′ but average out to that amount when considering the cells on the edges

[Bill Buckley]

I’ve tried a smaller cell size 50’x50′ which is 3563 cells and avg 2553 sf, but same error message

[Eric R]

Try a newer or older version of HR.

[Bill Buckley]

Thank you Eric and Luis for your help. I figured it out. I always create a Projection folder, Terrain folder, and Plan folder at the start of a project. So far so good, but when I created my terrain I didn’t use the default directory, but sent it into the Terrain folder I created, so the geometry was looking in the wrong location for the terrain and that is why I kept getting that error message. Hopefully this helps anyone else who made this mistake.
Thanks again.

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