2D area Mann's region

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2D area Mann's region

karlo.miletic
Hello i have a problem with Hec-Ras function named in title. When i create polygon/area i get this msg: Not shure if picture is uploaded. But msg is : Associated layer : not yet associated with this geometry. Therefore i can't eddit area or asign different manings N. Please does anyone know how to fix this problem ?
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Re: 2D area Mann's region

Toby
Have you imported / created a land cover map in ras mapper?  The 2d polygon can only be used with a land cover map that is already imported.  It overwrites the base values.

Check page 3-21 of the HEC RAS 2D users manual.
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Re: 2D area Mann's region

Karlo
Thank you for your answer, so what i need to do is create polygons in another software ? When i hit to create new layer i can only import things.
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Re: 2D area Mann's region

Lonnie A
A "cheat" is to draw a storage area that covers your geometry and then go into mapper, right click on the storage area layer and export to shapefile. Now you have a shapefile that you can import as a landcover.  This will let you use the regions tool.  You can draw multiple SA for differing land classes if you wish.
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