Micha wrote:
> We're used to perceiving shadows below and highlights above
> what is being lit. The same holds for a hill-shaded terrain.
> When we see shadows on a slope, it seems to be south facing,
> and highlights appear north facing. So if you "place" the
> sun at 130° (SE) then you are lighti
> Date: Thu, 23 Sep 2010 11:06:21 +0300
> From: Maris Nartiss
> Subject: Re: [GRASS-user] Re: QGIS GRASS plugin shadedrelief issue
> To: nunosousa84
>
> Sorry for You.
> You do made backup of important data before messing around with QGIS, right?
>
> You can try
On 09/23/2010 06:46 PM, nunosousa84 wrote:
yes you're right, my distraction. Well i was able to work it out much more
relaxed now :-) I still think the results from the shaded relief are a bit
odd. For example if use 130º azimuth the river valleys appears above the
near mountains, but if i use de
On Thu, Sep 23, 2010 at 3:35 PM, Micha Silver wrote:
> On 09/23/2010 10:18 AM, nunosousa84 wrote:
...
>> By the way i
>> notice one think. When trying to open the recovered grass vector layer it
>> seems he automatically devided it in two (one for the lines and one for
>> the points). Well the pro
yes you're right, my distraction. Well i was able to work it out much more
relaxed now :-) I still think the results from the shaded relief are a bit
odd. For example if use 130º azimuth the river valleys appears above the
near mountains, but if i use degrees between 270 and 0º or between 0 and 90
On 09/23/2010 10:18 AM, nunosousa84 wrote:
Thank you Maris. Well i was able to recover it yesterday. I will put here the
error it gave me than the v.build solution. I have posted this in QGIS
forum:
""This is what it gives back:
"terminate called after throwing an instance of 'QgsGrass::Excepti
Thank you Maris. Well i was able to recover it yesterday. I will put here the
error it gave me than the v.build solution. I have posted this in QGIS
forum:
""This is what it gives back:
"terminate called after throwing an instance of 'QgsGrass::Exception'
what(): Unable to open vector map on le
Sorry for You.
You do made backup of important data before messing around with QGIS, right?
You can try to launch GRASS and rebuild vector topology with v.build.
If it doesn't help - You'r SOL. And don't forget to infrorm QGIS
developers how "well" their GRASS support works.
Good luck,
Maris.
2
I can't believe this a nightmare just happened! This is ubelivable. Suddenly
when i was working with the vector layer digitizing the values QGIS just
crashed puff completely. Run out of the program. I tried to open QGIS it
started again but opening the vector layers from the GRASS Plugin crashes i
nuno:
> Ok solved the problem of the null-cells. Did g.region.zoom
> to the shadedrelief layer and shrink the region boundaries, so
> now r.univar gives 0 null-cells :-).
great
> But i think i still have to solve the vector/raster lines
> problem that might be causing some artifacts on the bounda
nuno wrote:
> One more thank you for your patient :-). I just noticed
> (believe me i was
> sleeping, hehehe) that all the vector lines don't snap to
> the region
> boundaries. Well let me explain with an image:
> http://osgeo-org.1803224.n2.nabble.com/file/n299/Vectorlinesnotouching.jpeg
no,
Ok solved the problem of the null-cells. Did g.region.zoom to the
shadedrelief layer and shrink the region boundaries, so now r.univar gives 0
null-cells :-). But i think i still have to solve the vector/raster lines
problem that might be causing some artifacts on the boundaries of the map.
Maybe
One more thank you for your patient :-). I just noticed (believe me i was
sleeping, hehehe) that all the vector lines don't snap to the region
boundaries. Well let me explain with an image:
http://osgeo-org.1803224.n2.nabble.com/file/n299/Vectorlinesnotouching.jpeg
You can see the vectorized
Nuno wrote:
> For all this steps i worked directly through
> GRASS 6.4 0RC6 and not QGIS. I have opened the grass raster
> layer with the contours (lines) and applyed the commands
> suggested:
> http://grass.osgeo.org/wiki/Contour_lines_to_DEM
>
> The result was this:
> http://osgeo-org.1803224.n2.
On 20/09/2010 23:39, nunosousa84 wrote:
Thank you Micha. Just to confirm that the output of slope module is:
total null and non-null cells: 2256660
total null cells: 6164
These null cells should be *only* around the edges, where there is not a
3X3 window to calculate the slope. By default t
Thank you Micha. Just to confirm that the output of slope module is:
total null and non-null cells: 2256660
total null cells: 6164
Of the non-null cells:
--
n: 2250496
minimum: 0
maximum: 78.8343
range: 78.8343
mean: 29.4765
mean of absolute values: 29.4765
standard deviation:
On 09/20/2010 06:18 PM, nunosousa84 wrote:
Here are the results:
http://osgeo-org.1803224.n2.nabble.com/file/n5551158/cleanresult.jpeg
Well im not sure but at first glance doesnt seem to have much relation. This
vector points layer that appear after runing the v.clean command shows also
possibl
Here are the results:
http://osgeo-org.1803224.n2.nabble.com/file/n5551158/cleanresult.jpeg
Well im not sure but at first glance doesnt seem to have much relation. This
vector points layer that appear after runing the v.clean command shows also
possible duplication of lines or just crossing lin
nunosousa84 wrote:
Good question Micha. Well i remember i checked the vector lines after
completing them (things like not crossing, not touching and confirming that
all of the lines has attributes to them, in this case altitude values). Then
i checked overlapping raster contours in relation to t
Good question Micha. Well i remember i checked the vector lines after
completing them (things like not crossing, not touching and confirming that
all of the lines has attributes to them, in this case altitude values). Then
i checked overlapping raster contours in relation to the vector lines to se
On 20/09/2010 12:32, nunosousa84 wrote:
Thank you all. Well i have some news. Hamish i have followed your suggestion
of using the mapcalc commands. For all this steps i worked directly through
GRASS 6.4 0RC6 and not QGIS. I have opened the grass raster layer with the
contours (lines) and applyed
Thank you all. Well i have some news. Hamish i have followed your suggestion
of using the mapcalc commands. For all this steps i worked directly through
GRASS 6.4 0RC6 and not QGIS. I have opened the grass raster layer with the
contours (lines) and applyed the commands suggested:
http://grass.osge
On 19/09/2010 22:26, Hamish wrote:
I wonder if the black-spots are a color table problem? what does
r.univar say about the shaded relief map?
That's what just occurred to me. If the spots just "magically" disappear
in GRASS, then try setting a different colormap in QGIS.
Micha
Hamish
Sab wrote:
> There is a native QGIS plugins:
> http://spatialserver.net/pyqgis_1.0/contributed/shadedrelief.zip
>
> To activate it in QGIS:
> Fetch Plugins, a new window will pop up:
> Click on Repositories tab
> Add 3rd Party repository
> Click on Plugins
> Install DEM relief Shader
>
> You shou
Thats totally correct in what concerns those black holes/spots disapearing,
besides that the results seem similar using r.shaded.relief or v.surf.rst as
you suggested, in both GRASS plugin and GRASS. I normally dont work directly
with grass, i find for now, since im a begginer, more easy to work w
On 09/19/2010 06:47 PM, nunosousa84 wrote:
Well i dont know what to say but this is what i got working directly through
GRASS 6.4.0RC6:
http://osgeo-org.1803224.n2.nabble.com/file/n5548006/Grasstest.jpg
Opening the same layer through QGIS gives those black holes/spots but
through GRASS not.
Well i dont know what to say but this is what i got working directly through
GRASS 6.4.0RC6:
http://osgeo-org.1803224.n2.nabble.com/file/n5548006/Grasstest.jpg
Opening the same layer through QGIS gives those black holes/spots but
through GRASS not.
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i created a surface from rasterized contours (r.surf.contour). Yes i have
acess to them i made them myself. First i created vector lines on top of a
topography chart (digital geotiff) in QGIS. From then on i worked with GRASS
plugin. Imported vector layer to GRASS, converted to Raster, used
r.surf
Thank you Sab. I have tried to use the shaded relief plugin but it gives the
following error:
"An error has occured while executing Python code:
Traceback (most recent call last):
File "/home/nmc/.qgis//python/plugins/shadedrelief/ShadedReliefDialog.py",
line 82, in accept
myEngine.run()
There is a native QGIS plugins:
http://spatialserver.net/pyqgis_1.0/contributed/shadedrelief.zip
To activate it in QGIS:
Fetch Plugins, a new window will pop up:
Click on Repositories tab
Add 3rd Party repository
Click on Plugins
Install DEM relief Shader
You should be able to create relief shade
Sorry didnt understand. You mean the GRASS plugin? available in QGIS. Plugins
-> Manage Plugins -> Grass. Thats what im using. Working inside QGIS but
through GRASS plugin. Sorry for any misunderstanding.
Nuno
--
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