[GRASSLIST:9750] Re: Add 3D Values

[David Bitner]

So actually to just get the profile data the fastest workflow would be:
1. create points along my line at specific distances with v.to.points
2. grab elevation for the points with v.drape (or would something else
be better for point data)
3. dump points and attributes (or at this point just dump distance and
elevation attributes, who cares about the point anymore)
4. process with my favorite graphing application


On 1/6/06, Dylan Beaudette <dylan.beaudette at gmail.com> wrote:
> Great.
>
> There are a couple ways of doing this.
>
> one such method:
> 1. create points along your line segment with v.to.points [1]
> 2. copy elevation attribute from line to points
> 3. dump points and attributes as text
> 4. process with your favorite graphing app
>
> [1] see manual for the details on this command- note that it will create an
> attribute 'along' which is a measure of the distance along the line you are
> interested in.
>
> cheers,
>
> Dylan
>
> On Thursday 05 January 2006 07:02 am, David Bitner wrote:
> > Perfect.
> >
> > Now is there a way that I can create a distance along the line to
> > elevation at that distance profile?  Even just a table of distance to
> > elevation that could be plotted in a graphing package.
> >
> > Thanks,
> > David
> >
> > On 1/4/06, Dylan Beaudette <dylan.beaudette at gmail.com> wrote:
> > > On Wednesday 04 January 2006 02:01 pm, David Bitner wrote:
> > > > Oops, I forgot to change the subject while replying...
> > > >
> > > > > Is there a way to extract elevations (either from contours or a dem)
> > > > > into a 2D line to add a 3rd dimension to the line?  Also, is it
> > > > > possible to create a distance, elevation profile along this line?
> > > > >
> > > > > Right now I have a 2D shapefile of a race course and a DEM (or
> > > > > contours) of the same area.  I would like to create a plot of
> > > > > distance to elevation across the course.
> > > > >
> > > > > I am jumping into Grass for the first time, so help at the most basic
> > > > > level would be great.
> > > > >
> > > > > Thanks,
> > > > > David
> > >
> > > try v.drape in the CVS branch.
> > >
> > > cheers!
> > >
> > > --
> > > Dylan Beaudette
> > > Soils and Biogeochemistry Graduate Group
> > > University of California at Davis
> > > 530.754.7341
>
> --
> Dylan Beaudette
> Soils and Biogeochemistry Graduate Group
> University of California at Davis
> 530.754.7341
>