[Qgis-user] Problem an the ploting contour lines

[Sergio Zárate Pedroche]

>
> Hello,
>
> The my problem is to create a map with contour lines.
>
> My file text is constituting by : latitute (y), longitude (x) and
> precipitation (z).
>
> Want to plot the contour lines of precipitation with the qgis.
>
>  This is possible? How I could do this in qgis?
>
> Thanks!
>
>
> *****************************************


GRASS can do that from qgis, but first, you need to generate a  
surface by interpolation, for example with  with r.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.

Hope it is useful,

Dr. Sergio Zárate Pedroche
José María Arroyo 228
Morelia, 58341, Michoacán
Tel. (443) 352-5307
Cel. (443) 438-6212
szpedroche at yahoo.com.mx



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