berendsen Posted February 22, 2013 Report Share Posted February 22, 2013 Hello All,I'm trying to automatically assign material types to a mesh according to the local land use pattern. So far I've found two ways:1.) for an existing mesh, manually assign each element one material type2.) assign the polygons, which are used to bound the auto-generation areas, a material type and then generate the mesh1. is, especially on larger meshes, very error-prone and time-consuming. 2. is possible, if one can generate the mesh from polygons - which isn't always possible or feasible.Is there a way to assign material types to an existing mesh using a polygon-shape?Thanks for the help and have a good WE,S. Berendsen Quote Link to comment Share on other sites More sharing options...
Alan K. Zundel Posted February 26, 2013 Report Share Posted February 26, 2013 You can use an "Area property coverage"1- create a new coverage and assign the type to be "Area Property"2- define the material zones as polygons in the coverage3- When you issue the "Map -> 2d Mesh" command specify that you want to use the Area Property as the material source. (I think you can also use this to just assign material types to an existing mesh as well.)There is also a method to use a land use raster, but that has only been developed for the ADCIRC model so far. If you are interested in using a raster approach, we can talk some more. Quote Link to comment Share on other sites More sharing options...
berendsen Posted February 26, 2013 Author Report Share Posted February 26, 2013 Thanks - works like a charm! It might be a good idea to include this work flow somewhere on the wiki or the demos ...I think I'll have to decline wrt land use raster - we only have polygon-shape land use data. Except ... we have false colour airial images for the area. Is it possible to automatically classify land use according to the colour bands in a neighbourhood raster? <- somehow this sound more like a GIS exercise, though. Quote Link to comment Share on other sites More sharing options...
Alan K. Zundel Posted February 26, 2013 Report Share Posted February 26, 2013 We are working on a method to use the colors in an image. It is a very GIS approach, but can still be useful.We will add the area property coverage to the wiki. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.