Thanks all, I've now managed to install Postgres and Postgis. I haven't
managed to set it up yet, but that's another story and I'm working on it.
Regards,
Nick.
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It's from the Training Manual Richard:
https://docs.qgis.org/2.14/en/docs/training_manual/spatial_databases/spatial_functions.html
Apologies if there is something more recent, if there is I couldn't find it.
Regards,
Nick.
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Ubuntu 20.04, QGIS 3.16.3.
I'm having problems installing Postgres and Postgis, the most recent version
of the manual I can find says:
$ sudo apt install postgis
$ sudo apt install postgresql-9.1-postgis
This doesn't work any more, Postgis installs but Postgres doesn't, I think
the relevant
Suggest you add a 1m buffer, dissolve the output and then buffer it using a
value of -1.
Regards,
Nick.
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This worked Rien, many thanks. Thanks too to berndv and to all who helped
with suggestions and advice, the QGIS project and its community really are
remarkable.
Cheers,
Nick.
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Hi berndv,
I thought we might be getting somewhere with your last suggestion, I made
the changes you mentioned and the SAGA NextGen tools duly appeared. I then
tried to run the SAGA Simple filter on a one-metre DTM, but this failed with
the message 'Unknown option 'MODE''. This is a step forward
The SAGA NexGen plugin is flagged as 'Experimental', which I think means 'it
may not work for you' - this is fair enough.
I see that SAGA 2.2.5 is still in the repository so I think I'll do away
with Version 7.3.0 in the short term and fall back on the older version,
calling it from the
Thanks for this, berndv. In the 'provider.py' file for SAGA NextGen I have
tried changing the required version to 7.3 but this doesn't make any
difference.
I think it's probable that the plugin really does need a valid 'SAGA folder'
to be set - and it's this that's got me stumped at present. All
Ubuntu 20.04, QGIS 3.14.16, SAGA 7.3.0
In QGIS I lean quite heavily on SAGA algorithms, which worked fine until I
upgraded to Ubuntu 20.04 (focal). This forced an upgrade of SAGA to Version
7.3.0. Trying to use this from the Processing Toolbox resulted in a warning
and problems, so I installed
And so it has, many thanks Andrea; thanks too to the QGIS team.
Cheers,
Nick.
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Every time I start QGIS 3.14 it tells me that a new version is available,
3.14.15. I'm using Ubuntu 18.04 and my QGIS repository is
"https://qgis.org/ubuntu bionic InRelease" and there doesn't appear to be
any sign of version 3.14.15 there yet.
Is this just for me or for everyone? This isn't a
Bump. I'd like to know the answer to this as well.
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Hi dsucher, I think you need to start a new thread for this, there are people
here who know about problems with QGIS on a Mac but they probably won't look
at this thread.
N.
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Thanks to all. In fact I was missing 'gdal-bin' - I've installed it now and
things appear to be working as they should. Strange that it wasn't included
in the QGIS installation though.
I installed QGIS as directed on the Downloads page:
sudo apt-get update
sudo apt-get install qgis
In the last couple of days I have done a clean install of Ubuntu 18.04.4 LTS,
followed by an install of QGIS version 3.10.2.
I now find that when I try to use gdal2tiles either from the Toolbox or from
a terminal I get the message "command not found". Thus, it would appear that
gdal2tiles was not
For the last few days QGIS has been starting without loading the Toolbox or
Vector and Raster tools. I get this Python warning:
traceback: File "", line 1, in
File "/usr/lib/python3/dist-packages/qgis/utils.py", line 359,
in startPlugin
plugins[packageName].initGui()
It is possible to assign georeferenced bounds to a raster using
gdal_translate:
gdal_translate -a_ullr input.png output.tiff
Where:
= upper left x
= upper left y
= lower right x
= lower right y
The resulting tiff won't contain CRS data.
Nick.
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Thanks again Alessandro, it's quite a problem for me.
Best, N.
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Thanks Alessandro, it was merged and closed. I'll reopen it and add the
comment there.
Best,
Nick.
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Version 3.10.1 arrived here during the week. Sad to say it would appear that
the WMS problem persists. Could anyone confirm this?
Should I report this as a bug too?
Best,
Nick.
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Version 3.10.1 arrived here during the week. Sad to say it would appear that
the WMS problem persists. Could anyone confirm this?
Should I report this as a bug too?
Best,
Nick.
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If you depend on WMS data I think you're probably right to hold-off upgrading
for the time being. QGIS 3.10 has problems with some WMS servers.
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I have gvSIG installed, solely because out of the box it can read ECWs and
export them as geotiffs (which I can use in QGIS). It wouldn't be right for
me to make comparisons between QGIS and gvSIG because I just don't have
enough experience of using the latter.
N.
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Thanks for this Richard, it's good to know what's causing the problem and
I'll live with it for the time being. I've also reported the problem to the
EA in the hope that they might be able to do something about it at the other
end.
Should I post a QGIS bug report?
Best,
Nick.
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I have problems with loading UK Environment Agency WMS layers. This has only
arisen since I installed QGIS 3.10.
I understand that when QGIS makes a WMS request it adds the current version
to the User-Agent string, so in version QGIS 3.10.0 this results in
"Mozilla/5.0 QGIS/3.10.0-A Coruña" and
Hi David, it just had the ring of a possible CRS problem. If you'd care to
email the raster image and the clipping layer I'll try it here, you have my
email address I think. N.
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Just a thought. A friend upgraded recently and some of his settings didn't
carry over, it was a CRS problem. Perhaps just check that the default system
CRS, the project CRS and the CRS of each layer is set correctly before
clipping.
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Sorry, my reply crossed with Calvin's.
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Hi Dylan,
If I understand your problem, I think the Azimuth and Distance plugin will
do what you require.
Cheers,
Nick.
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Hi Rutger,
I gather your contour data is for Scotland. In case you didn't know, you can
download a GeoPackage containing contours at 10 m vertical intervals for the
whole of GB (including Scotland) as open data from the Ordnance Survey. I
use this data myself in QGIS. See:
Thanks for this Jürgen, I installed python-gdal and things are now working as
they should. N.
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Ubuntu 18.04. QGIS 3.4.1
I have a problem when attempting to merge rasters, the process fails with
the following message:
2018-11-12T16:06:37 INFOGDAL execution console output
/bin/sh: 1: gdal_merge.py: not found
Thus it appears that QGIS is looking for a file called
The *.asc files supplied by the EA will load directly into QGIS as rasters.
Layer -> Add layer -> Add raster layer.
N.
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For each pixel in a DEM you can write out the coordinate and elevation to a
space-delimited text file simply enough. Raster -> Conversion -> Translate
(Convert format) and select 'ASCI Gridded XYZ (*.xyz *.XYZ)' as the output
format.
N.
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Unless something has changed recently, no you can't do this.
N.
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64-bit Ubuntu 12.04.5, QGIS 2.5 (nightly) from the Ubuntugis repository.
I'm having problems with Grass 7 tools when trying to run them from the
Processing toolbox. Processing fails with the error message shown below. I
have tried deleting /home/nick/.qgis2/processing, but the problem persists.
Ubuntu 12.04, QGIS 2.3.0-Master from Ubuntugis.
QGIS is labelling features with NULL attributes with 'NULL's. This started
to happen following an update a few days ago, does anyone else have this
problem?
Nick.
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Jürgen E. Fischer wrote
Hi Nick,
On Fri, 25. Apr 2014 at 01:54:17 -0700, Nick Hopton wrote:
Ubuntu 12.04, QGIS 2.3.0-Master from Ubuntugis.
QGIS is labelling features with NULL attributes with 'NULL's. This
started
to happen following an update a few days ago, does anyone else have
I've been told that the latest version of the polygonizer ('Polygonize')
needs Shapely version 1.2.16 or higher.
N.
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Alex Mandel-2 wrote
OTB is usable from Processing, but is optional like SAGA, R, and GRASS
the program needs to be installed separately so Processing can use it.
Once you have it installed Processing will let you access the algorithms
for it.
Thanks for this Alex, I've installed OTB and after
Travis Kroger wrote
I asked about this before, but I think I may not have been asking the
right
question. I want to use the binary morphological filter tool in OTB, but
I
am unable to install OTB on my home work work computers (either windows 8
pro or windows 7 enterprise). There is no
giedrius wrote
I tried, but the plugin does not work. Writes error:
An error has occured while executing Python code:
Traceback (most recent call last):
File /home/giedrius/.qgis2/python/plugins/qgsAzimuth/qgsAzimuth.py,
line 188, in addgeometry
if (surveytype== 'polygonal'):
I get a similar crop of messages and no Python support when starting QGIS
following yesterday's update of the nightly development version. (Ubuntu
12.04).
This seems to happen sometimes, in the past it's been a problem with a bad
configuration file.
N.
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An attempt to install the Qtiles plug-in this morning succeeded, so I guess
this means it's been fixed. Many thanks for this.
Nick.
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Hi Gill,
I might not understand your problem fully, but I think that as a newcomer to
QGIS a reasonable approach would be to load your OS OpenData map images
first and then load the contours. (I'd keep clear of the OpenData contour
DXFs if I were you and go for the new contour data in shapefile
Alexander Bruy wrote
try to remove qtiles folder and install it from scratch.
Sorry Alex, I'm not finding a qtiles sub-directory in .qgis, .qgis2 or
/usr/share/qgis/python/plugins/. Any ideas?
Cheers,
Nick.
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Luisa Peña wrote
Dear all,
I have a vector (in ESRI Shapefile) and I wanted to know what is its scale
of oproduction (1:1000 or 1:10 or something) since I have no
associated
metada.
Thanks
Luisa
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Thanks all, that fixed the problem.
Nick.
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QGIS Master from the nightly repository, Ubuntu 12.04 (amd64).
Hi All,
There were problems with this morning's upgrade (and yesterday's too) with
python-qgis-common and python-qgis:
pycentral: pycentral pkginstall: error byte-compiling files (549)
pycentral pkginstall: error byte-compiling
Jacob Overgaard Madsen wrote
What is the easiest way to fix these data? I have played around with the
Affinetransformation plugin, but it's extremely cumbersome to do with this
plugin, as it's really trial and error.
I don't get on with the QGIS affine plug-in either. You might care to try
Ubuntu 12.04 (64-bit), QGIS Master.
After creating a line in a shape file the form for entering its attribute
data pops-up as it should. However, it is not possible to enter the
attribute data (sometimes the form is greyed-out and sometimes it is empty,
this has varied with differing versions of
Ramon Andiñach wrote
Hi Nick,
Not that I'll definitely be able to help, but what sort of not opening
properly? (and which QGIS?)
What should happen is that if you open the TIFF, then QGIS reads the tab
file for coordinate system information and displays it. 1.9 is better at
this than 1.8
Hi Agnes,
I'm having problems with TIFF images with TAB files not opening properly in
QGIS. As with you, some do and some don't.
Are your problems with images too?
Regards,
Nick.
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Hi Hannah, have you tried running GRASS v.transform from the Sextante
toolbox? It's always worked for me.
N.
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tudorbarascu wrote
Hi,
I had the same problem and the solution is to edit the
/usr/share/qgis/python/plugins/sextante/tests/SagaTest.py.
The first lines should look like:
from sextante.tests.TestData import points, points2, polygons, polygons2,
lines, union,\
table,
Hi Ivan, how did you install Shapely? The version you get using the OSGeo4W
installer has always worked for me.
Nick.
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Ubuntu 12.04 (amd64), Master, nightly repository.
Hi all, attempting to update Master yesterday and again earlier today left
me with no Python support. The problem appears to be with python-qgis and
and python-qgis-common. The message from the update manager is shown below.
Any ideas?
Regards,
Just checking Bert, but have you seen this?
http://confound.me.uk/maps/ppv4.pdf
This is the way I work, I find it quicker than tracing polygons and it also
separates the job of digitising from the job of entering data (which I find
convenient).
The only other way I can think of would be to
All I can think of is that these might be UPS coordinates that have somehow
got themselves formatted as geographic coordinates. What part of the world
are we talking about here, where should the points plot on the globe?
Nick.
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Gerardo Jimenez wrote
First, your data is kind of rare, you can not have more than 60 minutes or
more than 60 seconds (50°96'06''2N for instance).
Share Gerardo's confusion. How can you have a geographic ordinate like
50°96'06''2N, it doesn't make sense. Surely no GPS receiver would produce
It's not the spaces in the filenames causing the problem is it? Probably not,
but it might be worth checking. N.
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Confirmed here too. Current nightly Master, Ubuntu 12.04.
Just the fields visible on the screen are filled, the rest are filled with
NULLs. I think I've seen this reported already, somewhere.
Nick.
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NickS wrote
I have a very simple georeferenced tif image file - it has about 8
different colour categories, which represent numeric ranges. How can I
convert the colours (which are in RGB format) into a raster, or better
still into a polygonised vector file?
Raster - Conversion - RGB to PCT
Using nightly Master, Ubuntu 12.04 (amd64).
Attempting to use the Polygonizer fails with the Python error listed below.
Is this just for me?
Regards,
Nick.
==ERRORS
An error has occured while executing Python code:
Traceback (most recent call last):
File
If you know the dimensions of the painting then georeferencing the image
should not present problems. For example, if the painting is 200 cm wide by
100 cm high you could georeference the image using a coordinate of 0,0 for
its bottom left-hand corner and 200,100 for its top right-hand corner. In
I'm trying to use the Sextante toolbox algorithm GRASS v.dissolve. I want to
save the results to a file, but when I try to do this all I am offered are
file types like TIFF, HDR, VRT and so on. The option to save to SHP is not
available.
QGIS Master, Ubuntu 12.04 (amd64).
Regards,
Nick.
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Thanks for the reply Victor. Many thanks too for the incredible, invaluable
Sextante tookbox. N.
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Giacomo Marchioro wrote
Thanks a lot for your help! The problem is that when I measure a distance
in the layer I have wrongs outputs, I measure lacunae of thousand
kilometers!
I'm searching some plugin to georeference in a ECEF system (so I would
have
no more angular distances) but is quite
I think Anita has already pointed you towards the answer to this question on
SE. You must georeference the raster.
Nick.
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Matteo Ghetta wrote
a few days ago I pointed out the problem when I update QGIS (see my mail
of 08.01).
It seems that still the problem is not been fixed in the nightly
repository. But I need to use the plugins, so has anyone an idea of when
this problem will be resolved? Are there some
I had a working Master on Ubuntu 12.04 until Sunday, when I tried to update
using the package manager. The update failed with the same problem that you
have.
You might be interested in an earlier failure, see the first couple of posts
here:
Thanks to Jürgen and Bernd for the comments.
I still don't know whether the problem was caused by me or by the
repository, but I'm pleased to say that Master installed correctly when I
tried again this morning (and I hadn't changed anything at my end).
Regards,
Nick.
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Ubuntu 12.10 (amd64), repository is qgis.org/debian-nightly precise main.
I'm trying to install the nightly build of Master on my system but have a
hit a problem, see below. Searching on the Internet suggests that other
people have experienced similar problems, but with no solution mentioned.
Can
Further to the above, one of the packages flagged with unmet dependencies was
python-qgis. Trying to install just this produced the following message:
=
The following packages have unmet dependencies.
python-qgis : Depends: python-qgis-common (=
Victor Olaya-3 wrote
If you go to the SEXTANTE configuration dialog, you will see a GRASS
entry, and there is an option to enable console output logging. Enable
it, run your GRASS command again...and hopefully you will have
information about what is happening
Here is the console output log
Victor Olaya-3 wrote
That message is not the problem with the buffer, it is another
problem. You have a model that includes a SAGA algorithm (it is an
example model), and you probably do not have SAGA installed so it
complains and it writes it to the log.
You problem description should be
One other thing, you want to collect statistics for your clipped raster, so
when you clip the raster make sure that you tick 'no data value' and enter a
value of (say) -3. This will set the value of the pixels in your clipped
raster that lie outside of your area of interest to 'null' and they
Antonio Silva wrote
Following the suggestions I got an error message: Cannot compute bounding
box of cutline. when cutting the raster.
Just checking, but the raster layer and the vector polygon layer do have the
same CRS? You can't cut a raster with a vector unless both have the same
native
I think the first thing to do is clip the raster to your area of interest
using the vector polygon. Raster - Extraction - Clipper. Select the
polygon shapefile as the mask layer.
To get the statistics load the clipped raster, right-click on it in the
layers panel, select Properties and then click
Could someone confirm that the QuickWKT plug-in isn't working in QGIS 1.9,
under both Ubuntu and Windows? Test polygon below, it's EPSG:27700 if QGIS
asks.
POLYGON((448609.94 119686.73,448567.98
119730.70,448569.50 119732.00,448581.80
119741.00,448591.50
kmithoefer wrote
Thanks a lot! i understand the problem now. I will create a custom
projection.
It might be more convenient to do an affine transformation, deducting
3200 (32 million) from the easting of each vertex in the shapefile. The
QGIS Vector Affine plug-in can do this.
Nick.
Hi Gerardo, we meet again. Using your vector data I can't replicate the
problem here, which two layers should I be using?
Nick.
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Jakob Lanstorp-3 wrote
Is there any way of measuring the line length on the fly while drawing the
line?
I have a starting point and need to draw say a 1,234 km long vector
line on top of a raster map in lat long degrees.
Are there other alternatives?
Long distances and lat/lon? The
Johannes Radinger wrote
+proj=lcc +lat_1=45.898919 +lat_2=47.696014 +lat_0=46.8
+lon_0=2.3372291667 +x_0=60 +y_0=220 +no_defs +a=6378249.2
+rf=293.466021294 +towgs84=-168.000,-60.000,320.000 +to_meter=1
Are you sure that the '+no_defs' parameter is in the right place? I've
magerlin wrote
But it seems ABC is rather poor at calculating the centroids.
I don't think this is the case, so far as I know there is no rule that says
that the centroid of a polygon has to lie within the polygon. If the polygon
was banana-shaped for example its centroid would almost
mikec wrote
like ARC Gis is there a way of tracing boundaries when you digitize so
that there are no spatial errors? I know there is snapping, but
sometimes that doesn't work as well.
When tracing lots of abutting polygons my preferred method is to to use
lines and polygonize them.
magerlin wrote
I've got a road network which is broken down to a lot of very short
sections. These I would like to join by the road name to just get one
feature per road name.
.
.
Any suggestions?
Vector - Geometry Tools - Singleparts to multipart. This should work,
unless I'm missing
For form's sake, I should start by renaming the CSV file to something that
doesn't have spaces, et cetera, for example, 'GPS_Android_points_IKE.csv'.
Next, swap the LONG and LAT column headers, these are the wrong way round.
When loading the CSV file into QGIS set its CRS to EPSG:4326. Find
A chap on QGIS at Stack Exchange is having problems with accuracy when
transforming from Ordnance Survey grid coordinates to WGS84 lat/lon. He's
finding discrepancies in the order of seven metres.
Using QGIS 1.7.4, OSGEO4W under Vista I was able to reproduce the problem,
but using QGIS Lisboa RC1
Micha Silver wrote
I;m getting numbers identical to your Ubuntu results in three tests:
QGIS 1.7.4 on Win7, QGIS1.7.4 on Scientific Linux, and also using
cs2cs. All the same, and all = to your Ubuntu values.
Maybe that will help to smoke out the problem?
Thanks for this
Andy Harfoot wrote
Have you tried the convertor here:
http://gps.ordnancesurvey.co.uk/convert.asp
to see whether the higher accuracy coordinates obtained from QGIS match
those obtained using OSTN02?
For the record, the Survey gives the following (ETRS89) lat/lon coordinates
for the
Piotr Pachół-2 wrote
Is it possible in Qgis or in Sextante plugin to convert line layer with
polylines to simple single lines ?
It should work as cad command explode.
If not may be it would be usefull to add new option (checkbox) in
command Multipart to singlepart.
Hi Piotr, the
Albin Blaschka-5 wrote
as far as I can tell from your data, your rasterfile has a problem with
its projection: The associated .tfw file you put online had the wrong
name (the raster is named ST.tif, therefore the .tfw - file has to be
named ST.tfw).
So two questions to dig further:
In the last month of its existence about 130 new topics were created on the
forum. It appears that during the same period about 54 new topics tagged
'QGIS' were created on Stack Exchange (SE) GIS. It is of course obvious that
there has been an increase in QGIS questions on SE following the closure
The forum closed a month ago and I think it's time for a look at how the new
arrangements are working.
To me, it appears self-evident that the number of postings made on Stack
Exchange by newcomers and less experienced users has not increased
significantly since the forum closed. So where are
Nathan Woodrow wrote
The last query that I just posted should be able to do it once the data is
updated to include April. Currently it only includes up till March. The
site is updated monthly so it should be there soon.
Thanks for this, it crossed with my last. Does 'Posts' equal 'New
If you're not bothered about your data mapping properly onto the 'real world'
you could use any projected CRS (projected, not lat/lon). All CRS's are just
simple xy grids, you could use my local one, EPSG:27700.
Better though to transform (affine) your data to an appropriate CRS.
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Piotr Pachół-2 wrote
I have problem with adding geometry column to some kind of shapefiles.
After executing the function 'export/add geometry column' all xcoord and
ycoord values equals zero.
I can confirm this behavior, QGIS 1.7.4, 32-bit Vista. Things work as they
should in Master
Hi Des, rather than using your contour data to make a DEM you might be better
off with OS OpenData DTMs and using the point sampling tool on these (you're
after what, spot heights?).
Where the landform hasn't changed since back in the Neolithic when the OS
DTMs were made they're not bad.
Nick.
Hi Des, just to add a lttle to what Lene wrote. As mentioned, import the GPX
file to QGIS, then save it as a EPSG:27700 projected shapefile. To do this
right-click on the GPX file in the layers panel, go 'Save As...' and set
'Format' to 'ESRI Shapefile'. Set the CRS for the new shapefile by
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