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On 2012/08/24 21:29, Micha Silver wrote:
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<div class="moz-cite-prefix">Hello Sam:<br>
<br>
On 24/08/2012 14:14, Samantha Goodchild-Brown wrote:<br>
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<blockquote cite="mid:50376230.8020300@geograph.co.za" type="cite">
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Mischa<br>
<br>
I am working on those commands but In Linux side I have got the
training map to raster format with all visible.<br>
More issues I overcame (for students benefit) is:<br>
I imported a shape file made in Qgis with the RGB column and
label column. To get this to work I had to select 'command
dialog' button in 'import vector data' box and not just use'
ivd' box gui.<br>
In the' import vector data' gui I ticked 'override dataset
projection (use locations projection)' and 'limit import to the
currect region' and made no other changes in the </blockquote>
<br>
That's unusual that you had to specify "override dataset
projection". Are you sure that the original is projected in the
same coordinate system as the GRASS LOCATION??<br>
</blockquote>
Yes I am sure. However the Raster is a new geotiff and the shape
file is old style. Evidently Grass doesn't recognise them as the
same. When you read the metadata in QGIS you can understand why but
it is still quite frustrating. <br>
<blockquote cite="mid:5037D607.3010306@arava.co.il" type="cite">
<blockquote cite="mid:50376230.8020300@geograph.co.za" type="cite">command
dialog box except to repeat input and output dataset names!<br>
Now v.to rast works but it doesn't allow out to specify the
attribute columns - looks greyed out, so you just type them as
you know them, it works!<br>
<br>
In windows grass I imported the same shp file, in the same way,
successfully. (this using grass not grass plugin in QGIS) In
the v.to.rast I can specify / select the attribute columns but
when I 'run' it, I get the following:<br>
<br>
(Fri Aug 24 12:46:44
2012) <br>
v.to.rast input=qgis_lclu_trainingmap2@3420new
output=trainingmap_raster column=cat_ rgbcolumn=RGB
labelcolumn=label<br>
Loading data...<br>
Reading areas...<br>
Reading features...<br>
Writing raster map...<br>
Converted areas: 6 of 6<br>
Converted points/lines: 0 of 0<br>
v.to.rast complete.<br>
(Fri Aug 24 12:46:45 2012) Command finished (0 sec)<br>
<br>
Which one would think means everything is fine but now can see
no data - the entire dataset created is the same colour (white).<br>
<br>
Is the data most likely still there and just not displaying
correctly, or has some of the attribute info all been lost and
it all does have the same value? <br>
</blockquote>
<br>
Did you set the current region to match the vector or raster of
training areas? ("Settings->Region->Set Region" and choose
the imported raster). Then in the map display use the zoom button
to "Zoom to computational region".<br>
</blockquote>
Yup. Ah, no wait. There is a problem here.<br>
OK, now I see. Set the computational region to be the import raster
before working. I didn't see that the project region is different
from the computational region.<br>
I definitely had g.region set but 'Then in the map display use the
zoom button to "Zoom to computational region"' I had completely
missed.<br>
I think it will always be a good idea to have 'show comp. extent'
ticked on!<br>
Many thanks.<br>
<blockquote cite="mid:5037D607.3010306@arava.co.il" type="cite"> <br>
You can also try "Vector->Query vector map->Query attribute
data" to see what you've got as far as attributes, and
"Vector->Reports and statistics->Basic metadata" to make
sure that you have as many polygons as you expect.<br>
<br>
<br>
<blockquote cite="mid:50376230.8020300@geograph.co.za" type="cite">
<br>
On 2012/08/16 18:48, Micha Silver wrote:
<blockquote cite="mid:502D2451.7060703@arava.co.il" type="cite">
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<div class="moz-cite-prefix">On 16/08/2012 18:11, Samantha
Goodchild-Brown wrote:<br>
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<blockquote cite="mid:502D0DBE.6020803@geograph.co.za"
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Thank you<br>
<br>
In my frustration I have reverted to linux version which has
proved useful - seeing more messages is helpful.<br>
Mischa, your tip of g.region vect as well as finding
reference to v.in.region has proved helpful. This is likely
to be my critical mistake.<br>
In using the 'grass interface' I have again hit the
RRR:GGG:BBB field request (as I did with windows).<br>
It is very frustrating to find this now again when I can
find no other reference to it anywhere (not even in tuts
cautioning to make label column).<br>
Is it absolutely neccessary to go into this at this point
(go all the way back and begin again) or is there a way to
'bypass' it?<br>
Or some quick shortcut?<br>
<br>
</blockquote>
<br>
Can you copy into an email the commands you are running, and
the results (errors) you are getting?<br>
If you're using the Linux terminal, then copy/paste the
commands and output, and post here.<br>
<br>
<blockquote cite="mid:502D0DBE.6020803@geograph.co.za"
type="cite"> <br>
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Sam<br>
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On 2012/08/15 19:52, Paolo Cavallini wrote:
<blockquote
cite="mid:792a509f-e88b-4c74-901a-6f96bfb6797f@email.android.com"
type="cite">Or use OTB, also through sextante.<br>
--<br>
<a moz-do-not-send="true" href="http://faunalia.eu/pc">http://faunalia.eu/pc</a>
<br>
Sent from mobile, sorry for being short<br>
<br>
<div class="gmail_quote">richard burcher <a
moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:drownedfrog@gmail.com"><drownedfrog@gmail.com></a>
ha scritto:
<blockquote class="gmail_quote" style="margin: 0pt 0pt
0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<pre style="white-space: pre-wrap; word-wrap:break-word; font-family: sans-serif">Another option is to create training polygons & use [1] SAGA for the
supervised classification (either standalone or through the Sextante
plugin). I've recently gone this way for a maximum likelihood
classification.
[1] <a moz-do-not-send="true" href="http://www.saga-gis.org/en/index.html">http://www.saga-gis.org/en/index.html</a>
Cheers,
Richard
--
View this message in context: <a moz-do-not-send="true" href="http://osgeo-org.1560.n6.nabble.com/problems-making-grass-training-map-via-qgis-tp4995324p4995387.html">http://osgeo-org.1560.n6.nabble.com/problems-making-grass-training-map-via-qgis-tp4995324p4995387.html</a>
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