[Qgis-user] How to generate (vector)contour lines for point data?

[Micha Silver]

On 10/01/2012 06:50 AM, AJAY KUMAR MULAKALA wrote:
> Dear sir,
>
> Suggest me how to generate contour lines for a point data (particular 
> to generate contour lines about an attribute information of point data)
>

You will need two steps. First use the points to create a raster 
surface. In the Raster menu, choose Analysis->Grid. With this GDAL tool 
you can create a raster using some simple algorithms. THen using this 
new raster as your surface, use the GDAL tool 
Raster->Extraction->Contour to get vector contour lines.

(Note that if you switch to the GRASS plugin, there are more 
interpolation algorithms available, especially "regularized spline"=rst, 
for creating the surface raster)

Regards,
Micha

> Regards,
> AJAY KUMAR
>
>
>
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-- 
Micha Silver
GIS Consultant, Arava Development Co.
http://www.surfaces.co.il