[Qgis-user] contour line

Giovanni Manghi giovanni.manghi at gmail.com
Sat Oct 25 16:30:24 PDT 2008


On Sat, 2008-10-25 at 20:45 -0200, Alexandre Santos wrote:
> 
> Hello,
>  
> My file is a shapefile with 3 coluns (lat, lon, value precipitation). 
> I would like to plot lines, contours with the GRASS. How to do it. Do
> you have a tutorial showing how to make


I believe you already had the answer

"GRASS can do that from qgis, but first, you need to generate a surface
by interpolation, for example with  with v.surf.rst,
(http://grass.itc.it/gdp/html_grass63/v.surf.rst.html), after which
contour may be obtained from the resulting raster map. You may also have
to use a mask to limit the operation to the area of your data. However,
the qgis module limits the options to set in your operation, so maybe it
is also advisable to run it from within GRASS."

v.surf.rst is also present in the qgis grasstoolbox

take care

-- GM --







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