What I was hoping to see was something like this:
http://www.surfaces.co.il/wp-content/uploads/2010/04/GrassToolbox.png
Here we can determine how many features, what spatial extent.... Maybe
that will give a hint why you're not seeing anything. Seeing this table
for one of the rasters and the empty vector might be of help.
--
Micha
On 15/04/2010 12:57, M.E.Dodd wrote:
http://www.amanita-photolibrary.co.uk/Untitled-1.jpg
I've stuck a screenshot at the above location on my personal website, I will
delete it eventually to stop things getting cluttered up, is there a more
suitable place for these screenshots?
Anyway, it shows the grass versions of the raster files, these are the ones
that worked ok, also the vector shapefile just in qgis (all of these should be
in same CRS). Then it shows the dialogue box when I am trying to add the grass
version of this shapefile that I had created earlier from the qgis version. It
is giving the error message 'no layers available in this map'.
As I mentioned this is the first time I have tried this and I think I followed
the manual correctly but have now got stuck. I suspect its something quite
straightforward that I am missing here but can't see what it is.
-----Original Message-----
From: Micha Silver [mailto:[email protected]]
Sent: 14 April 2010 20:45
To: M.E.Dodd; qgis-user
Subject: Re: [Qgis-user] averaging raster grid
M.E.Dodd wrote:
Am still trying this. Seems I might be nearly there but for some reason can't
create a grass vector layer so can't use the v.rast.stats command.
I have created the grass raster layers from the raster layers that are open in
qgis and they seem fine but when I try to create the grass vector layer it says
its worked but then won't visualise it. to summarise this part I have an open
vector layer in qgis, also saved as a shapefile, when I run the command to
convert this layer to a grass vector layer there are not errors but it won't
visualise when the command completes and I can't add it as a new grass layer
even though it says it recognises the filename.
Hi Mike:
(I'm assuming that the vector and raster are projected in the same CRS,
and they overlap.)
Can you open the GRASS toolbox and switch to the Browser tab. Then open
the vector section, and click on this imported vector. On the right you
should see a table similar to below.
Please either post a screen shot on the web somewhere, or you can
copy/paste the text into a mail message. Send this to the qgis-user
maillist and we can try to understand what is wrong.
While you're at it, grab the same table of info for the raster, and post
that as well...
Vector
veg
Points
0
Lines
0
Boundaries
5732
Centroids
835
Areas
4293
Islands
3516
North
55:51:56.766357N
South
39:35:35.604858N
East
30E
West
12:35:51.329041E
3D
no
History
COMMAND: v.in.ogr -o
dsn="/home/micha/geodata/Training/Geodata/vector/VMAP0/veg_cropland.shp"
output="veg" min_area=0.0001 snap=-1
GISDBASE: /home/micha/geodata/grass
LOCATION: WGS84 MAPSET: PERMANENT USER: micha DATE: Wed Apr 14 22:21:18 2010
------------------------------------------------------------------------
802 input polygonsTotal area: 1.053955e+12 (4293 areas)Overlapping area:
7.020819e+09 (53 areas)Area without category: 1.341091e+11 (3458 areas)
--
Micha Silver
http://www.surfaces.co.il/
Arava Development Co. +972-52-3665918
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