Dear GRASS users,
(This is kind of new topic to me.)
After reading this paper that addresses the mixed-pixel issue via neural
networks using Landsat Thematic Mapper (TM) data:
Tatem, A. J., Lewis, H. G., Nixon, M. S. and Atkinson, P. (2003)
Increasing the spatial resolution of agricultural
On 14/05/12 00:54, Marcello Benigno wrote:
Hi Professor Carlos,
Please take a look here:
http://profmarcello.blogspot.com.br/2012/02/grass-snapping-points-to-lines.html
Nice solution. You could probably simplify a bit more by using v.in.db
instead of v.out.ascii/v.in.ascii.
Moritz
On 14/05/12 10:42, Danny Luque Ramirez wrote:
Hi list,
I'm trying to calculate a DEM out of my XYZ data. After the calculation I
need to transform the projection to EPSG: 31467. Does GRASS offer a good
workflow for this?
Yes.
If you are unfamiliar with GRASS, you might want to start here:
Dear all,
I have a digitized hydrological network and I need to calculate the stream
order (Horton, Strahler etc).
I found r.stream.order but it requires that the hydrological network comes
from a DEM, which in my case produced an hydrological network that is
considerably different than the
Hi Moritz,
thx for the quick answer :)
What about the calculation of a DEM from XYZ data? I didn't find a tool to
perfom this within GRASS.
cheers
--
View this message in context:
On 14/05/2012 15:52, Danny Luque Ramirez wrote:
Hi Moritz,
thx for the quick answer :)
What about the calculation of a DEM from XYZ data? I didn't find a tool to
perfom this within GRASS.
v.surf.rst
Dear all,
exporting a GRASS vector in Postgis suing v.out.ogr the geometry srid is
not conserved and I obtain a table with srid = 900914.
There is a way to force the srid export of a grass vector using v.out.ogr?
Something like the -a_srs option of the ogr2ogr command.
Many thanks in advanced.
Hi Filipe,
you mean your hydrological network is in vector format?
Maybe you can try the v.strahler add-on but I don't know
how uptodate this module is:
http://grass.osgeo.org/wiki/GRASS_AddOns#v.strahler
/johannes
Am 14.05.2012 um 13:26 schrieb Filipe Silva Dias:
Dear all,
I have a
Hi Johannes
Yes, its in vector format, but it could be converted to raster if necessary.
I installed v.strahler with g.extension, but loading it produced an error.
Is there another one?
Thanks
Traceback (most recent call last):
File C:\OSGeo4W\apps\grass\grass-6.4.2\etc\wxpython\gui_m
Hi Roberto,
My experience is that it's just best to export from GRASS as a shapefile
and then import into PostGIS, specifying the coordinate system as I import.
That's for that very reason - otherwise the coordinate system seems not to
make it out of GRASS, or perhaps it's PostGIS that can't read
I tested in both Ubuntu and GRASS 32bits and works fine, so the problem is
only in the 64bits version.
[]'s
2012/5/13 Marcello Benigno benigno.marce...@gmail.com
Hello Guys,
I'm trying to use r.stream.vector, but when creating the table of
attributes an error occurs. I am using the sqlite
On Mon, May 14, 2012 at 4:52 PM, Daniel Lee l...@isi-solutions.org wrote:
My experience is that it's just best to export from GRASS as a shapefile and
then import into PostGIS, specifying the coordinate system as I import.
That's for that very reason - otherwise the coordinate system seems not
Hi,
just to add to what others have already said; it is better to
reproject to your target projection _before_ doing the
rasterization step, that way you avoid the generational loss
from r.proj. Try to import them directly as points into your
target location.
So methods could be:
xyz.txt -
I wonder why you want to use the Landsat TM data for the analysis of
the high resolusion agricultural land cover.
The Landsat TM, not ETM, has very long histry and is not the High-resolution
data as for both spatial and frequential points of view.
There are so many research papers for the
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