[GRASS-user] triangulation

GRASS GRASS user
1

vinod wrote:

I am using grass latest version and i want to know

How to triangulate the raster data using grass

so you have a raster grid you'd like to simplify into a TIN?
see Laura's r.refine addon module:
  http://grass.osgeo.org/wiki/TIN
(see also
  http://grass.osgeo.org/wiki/Contour_lines_to_DEM )

so that i can assign attributes for each pixel?

no need for triangles, 'g.region res=' + 'r.to.vect feature=point'

Hamish

2

Hi Hamesh,

I only have raster data and am intrested to make grid which is generally needed and Traingulate for the raster data.

Simply i am making 3d TIN where i do not have ascii values of ´ Z ´ .

Thanks,
nani.

On Wed, Apr 6, 2011 at 9:11 AM, Hamish <hamish_b@yahoo.com> wrote:

vinod wrote:

I am using grass latest version and i want to know

How to triangulate the raster data using grass

so you have a raster grid you’d like to simplify into a TIN?
see Laura’s r.refine addon module:
http://grass.osgeo.org/wiki/TIN
(see also
http://grass.osgeo.org/wiki/Contour_lines_to_DEM )

so that i can assign attributes for each pixel?

no need for triangles, ‘g.region res=’ + ‘r.to.vect feature=point’

Hamish

3

Do you mean you want to interpolate your data?

On Wed, Apr 6, 2011 at 4:30 AM, vinod kumar <nani.kunithi@gmail.com> wrote:

Hi Hamesh,

I only have raster data and am intrested to make grid which is generally
needed and Traingulate for the raster data.

Simply i am making 3d TIN where i do not have ascii values of ´ Z ´ .

Thanks,
nani.

On Wed, Apr 6, 2011 at 9:11 AM, Hamish <hamish_b@yahoo.com> wrote:

vinod wrote:
> I am using grass latest version and i want to know
>
> How to triangulate the raster data using grass

so you have a raster grid you'd like to simplify into a TIN?
see Laura's r.refine addon module:
http://grass.osgeo.org/wiki/TIN
(see also
http://grass.osgeo.org/wiki/Contour_lines_to_DEM )

> so that i can assign attributes for each pixel?

no need for triangles, 'g.region res=' + 'r.to.vect feature=point'

Hamish

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4

Hi Victoria,

I want to give you a clear idea what am doing. So that you will help me in giving a best solution.

Explanation:

  • I am having an orthophoto where am intrested to make 3D layer.
  • I want to make grid and triangulate the data in order to get weightage factor for each pixel for the entire raster data, which helps me to make
    3D layer.
    If you are having any idea on making 3D layer other than this method which i have explained, you are pleased to welcome.

Note: This is an ortho photo which only have x and y values, not a LIDAR data having x,y,z values in order to use the command like Importing x,y,z nodes with v.in.ascii,

Thanks,
nani.

On Thu, Apr 7, 2011 at 10:09 PM, Daniel Victoria <daniel.victoria@gmail.com> wrote:

Do you mean you want to interpolate your data?

On Wed, Apr 6, 2011 at 4:30 AM, vinod kumar <nani.kunithi@gmail.com> wrote:

Hi Hamesh,

I only have raster data and am intrested to make grid which is generally
needed and Traingulate for the raster data.

Simply i am making 3d TIN where i do not have ascii values of ´ Z ´ .

Thanks,
nani.

On Wed, Apr 6, 2011 at 9:11 AM, Hamish <hamish_b@yahoo.com> wrote:

vinod wrote:

I am using grass latest version and i want to know

How to triangulate the raster data using grass

so you have a raster grid you’d like to simplify into a TIN?
see Laura’s r.refine addon module:
http://grass.osgeo.org/wiki/TIN
(see also
http://grass.osgeo.org/wiki/Contour_lines_to_DEM )

so that i can assign attributes for each pixel?

no need for triangles, ‘g.region res=’ + ‘r.to.vect feature=point’

Hamish

grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user