[Qgis-user] Interpolation of contour lines

[Vincent Blanqué]

Hi, thanks for your solutions in fact. I have edited the 10m contour 
lines and I just want to make contour isolines to 5m from the 10m 
shapefile (vectors) without using any intermediar DEM or TIN. Maybe 
Grass has a such function to interpolate vectors not only rasters?

For now, we take the decision to to calculate 5 meter contour lines and 
to merge only the new curves and editing the bad ones in the flat zone.

thx for trying to help me,

Enzopolo


On 13/06/2011 16:18, Saber Razmjooei wrote:
>> Actually not so much "converting" as it would be "adding" based on
>> existing 10m.
> By "converting" I meant "interpolate"...(OP:and I would like to
> interpolate each 5 meters)
>
>> Could choose to merge the '5m buffered lines' afterwards, or not.
>>
>> Of course if there is a DEM with 5m resolution or better,
> You can create contours with 5 m intervals from a 50 m resolution DEM.
>
>
>
>>   it would be
>> more accurate to use the Contour.plugin (need matplotlib installed) or
>> GRASS.
>>
>> Just depends on what data is available and use case.
> Cheers
> Saber
>
>>
>>
>> On Mon, Jun 13, 2011 at 11:50 AM, Saber Razmjooei
>> <razmjooeis at faunalia.co.uk>  wrote:
>>          I guess Mars meant converting a contour lines of 10 metre
>>          intervals to 5
>>          metre.
>>          Best to do it using GRASS (plugin). Here is a nice Wiki page:
>>          http://grass.osgeo.org/wiki/Contour_lines_to_DEM
>>
>>          Once you have it as DEM (i.e. raster) you can use r.contour in
>>          GRASS or
>>          Contour tool under GDAL in QGIS (Raster>  Contour) to convert
>>          it to 5
>>          metre contour vector.
>>
>>          Saber
>>
>>
>>
>>
>>
>>
>>          On Mon, 2011-06-13 at 11:31 -0700, Mars Sjoden wrote:
>>          >  Why not buffer a left or right side of your contour line @
>>          5m?
>>          >
>>          >  I presume your contour lines are vector polylines.
>>          >
>>          >  Unless you mean to interpolate from an existing DEM?
>>          >
>>          >  mars
>>          >
>>          >  2011/6/13 Vincent Blanqué<vblanque at oriondata.cl>
>>          >          Hi,
>>          >
>>          >          I have contour lines each 10 meters and I would like
>>          to
>>          >          interpolate each 5 meters. Is there any Qgis
>>          functionality to
>>          >          generate these? Any plugin? Or is it possible with
>>          ogr2ogr?
>>          >
>>          >          thx,
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>>          >
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>>
>>
>>
>


-- 
Vincent Blanqué
Oriondata Ltda.
http://www.oriondata.cl
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