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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>
<br>
<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>
<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>
</div>
<blockquote cite="mid:502D0DBE.6020803@geograph.co.za"
type="cite">
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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>
<br>
Sam<br>
<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>
Sent from the Quantum GIS - User mailing list archive at <a moz-do-not-send="true" href="http://Nabble.com">Nabble.com</a>.
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