[GRASS-user] Creation of a DEM

[quinonero juan manuel]

1.- You have to transform the vector information to a rast layer, you can do it using the comand v.to.rast, baut before you have to determine the cell resolution using for example g.region res=meters
   
  2.- If you wsnt to create a good DEM you have to change the units of the rast layer created, Only have to convert this layer from meter to centimeter using r,mapcalc 'cm_layer=rast_meter*100.00'. That's for obtain a good relation betwen horizontal and vertical resolution.
   
  3.- Now you have to use an interpolatión method to create a DEM continous surface. There are several methods, the commonest is r.surf.contour tat use a lineal interpolation. If you use this command you must use the option -f and it'll build faster, dont forget this point!!!!
   
  4.- Finally you have to transform the results to the correct units usin r.mapcalc 'final_DEM=cm_DEM/100.00'
   
   
  If you want to generate a DEM usin another interpolation methods please ask!!
   
  Sorry for my english
   
  Juanma

megha shyam <capt_lms at yahoo.co.in> escribió:
    Please help me in creation of DEM.i have a vector layer contaning contour information.How to create a DEM model  of this.Can you tell me the stpes to be followed
   
  shyam
   
    
---------------------------------
  Here’s a new way to find what you're looking for - Yahoo! Answers _______________________________________________
grassuser mailing list
grassuser at grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser


 		
---------------------------------

LLama Gratis a cualquier PC del Mundo.
Llamadas a fijos y móviles desde 1 céntimo por minuto.
http://es.voice.yahoo.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/grass-user/attachments/20070324/13ceeb78/attachment.html