[GRASSLIST:9751] Re: Add 3D Values

[Dylan Beaudette]

Sounds good to me. 

In fact I have used a similar method before the advent of v.drape, using 
v.to.points and v.sample to get elevation and precip transects along an 
arbitrary line. Plotting was done in gnuplot, exported to PS.

Ex: http://casoilresource.lawr.ucdavis.edu/drupal/node/33

good luck!

Dylan

On Friday 06 January 2006 11:09 am, David Bitner wrote:
> 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

-- 
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341