On 05/08/2010 09:38, Frank Broniewski wrote:
Yesterday I received a note off list which pointed me to an error I
made when calculated the elevation
If you used r.mapcalc, make sure to divide by 10.0 and not 10
in order to get DCELL output, otherwise the result will be integer
with terr
Yesterday I received a note off list which pointed me to an error I made
when calculated the elevation
If you used r.mapcalc, make sure to divide by 10.0 and not 10
in order to get DCELL output, otherwise the result will be integer
with terraces, as in the aspect map, particularly on 5m
Hi,
Hamish:Feb 28, 2010; 03:15am Re: High resolution dem
I am curious to know what the problem with r.surf.contour was. Usually
it does a great job as long as you take a moment to work around the
integer and NULL/0 issues.
Sorry that I quitted this discussion so silently, but I had to drop thi
Thanks for posting the
http://grass.osgeo.org/wiki/Contour_lines_to_DEMlink - it cleared up a
lot of confusion I had about what the different
modules discussed actually do!
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> > Frank Broniewski wrote:
> >> My region is 17.000 x 13.000 cells wide (5m horiz.
> >> resolution). So my
Hamish:
> > that is getting big, but shouldn't be too bad. except
> > perhaps for v.surf.rst (and r.fillnulls which uses it).
> >
> > hmmm... I wonder if it would speed up r.fillnulls & save
On Sun, Feb 28, 2010 at 3:15 AM, Hamish wrote:
...
> Frank Broniewski wrote:
...
>> My region is 17.000 x 13.000 cells wide (5m horiz. resolution). So my
>
> that is getting big, but shouldn't be too bad. except perhaps for
> v.surf.rst (and r.fillnulls which uses it).
>
> hmmm... I wonder if it w
On Sunday 28 February 2010 02:15:45 Hamish wrote:
> John Tate wrote:
> > and then patched (r.patch) them all together. The patching should
> > average out any differences.
>
> r.patch doesn't average, it uses the cell from the first-listed raster
> map which contains a non-NULL cell. Later-listed
[long, but hopefully interesting & check out the link to the new surface
trials wiki page in the middle]
Frank Broniewski wrote:
> I am trying to create a high resolution dem from contour lines Until
> now all my tries where not successful. At first I tried r.surf.contour,
> but since my interpol
ks so far for all the answers
Frank
--
From: "Nick Cahill"
Sent: Thursday, February 25, 2010 3:40 PM
To: "GRASS user list"
Subject: Re: [GRASS-user] High resolution dem
Dear all,
Just to refer to a previous question
Dear all,
Just to refer to a previous question - when I have had to make relatively high
resolution DEMs (much smaller than yours, only 5000 x 3000 cells), I found it
most effective to use Arc/Info to create a TIN from contour lines and points,
then rasterize that and import the raster into GRA
Frank wrote:
> My contour map is a combinatin of a national contour line map (5m vert.
> resolution) and contours from SRTM with 20m vert. resolution. I created a
> "hole" in the srtm contours for the national contour map and patched both
> together to avoid large gaps with no height values
Hi Frank,
Not sure this will help, as I am slightly unsure what you are attempting, but
you may be able to apply what I did to create a DEM from tiles.
I interpolated my 70 1km tiles with v.surf.rst by interpolating a 1050x1050
cell area (1.05kmsq). I cropped with g.region and r.mapcalc to 1020
Hello,
I am trying to create a high resolution dem from contour lines Until now all
my tries where not successful. At first I tried r.surf.contour, but since my
interpolation region is not rectangular and the contours are not evenly
distributed (rough terrain), the result was unfortunately not
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