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Nov
21
comment how to tidy up line intersections
Do the lines actually intersect (with topology) or just cross each other?
Nov
19
answered GDAL polygonize only certain raster values
Nov
18
comment QGIS I would like to get a single point from a polygon Centroid if within the polygon any point if not
Thanks neuhausr; I'm not sure how to avoid that--I suppose the st_pointonsurface command isn't exactly optimized for what you are trying to do, but I'm not sure what else would be!
Nov
18
answered QGIS I would like to get a single point from a polygon Centroid if within the polygon any point if not
Nov
15
comment How to extract mountain peak points from a given digital elevation model?
To improve on method 2) you could also find the highest elevation value in each 'peak' after nulling the lower values, rather than just using the centroid.
Oct
31
comment Georeference image is mirrored
I've seen this too in the past, and would like to hear an answer. If I recall correctly though, it had to do with the CRS not being set properly. Can you confirm that your map CRS is properly set?
Oct
8
awarded  Yearling
Oct
1
comment QGIS Cloud in QGIS 2.0 missing and 2.0 Crashing
It is best to create separate questions for each of your points. It is impossible for anyone to respond to your questions as asked.
Sep
27
revised Why does vector grid creation crash?
correction to vector vs. raster
Sep
25
comment Import csv file and use “toggle editing” and “field calculator” without Saving it as a Shapefile.
As far as I know, no. It brings it in as a non editable 'virtual layer' - you must save it to an OGR editable file first.
Sep
24
revised QGIS I would like to get a single point from a polygon Centroid if within the polygon any point if not
added 227 characters in body
Sep
24
answered QGIS I would like to get a single point from a polygon Centroid if within the polygon any point if not
Sep
20
comment Can the software be installed silently?
@LDFerg: No, if you install via the OSGEO4W package, everything is contained in the install folder. Give it a try, I suspect it will work for you.
Sep
20
answered QGIS - Continuous buffer image [Heat Map]
Sep
20
comment QGIS - Continuous buffer image [Heat Map]
Giulio; the effect you are looking for is a raster operation (rather than vector) and is called a heat map. Try a search for QGIS and heat map and you will find lots of options.
Sep
18
comment GRASS v.Overlay/QGIS Intersect Speed intersecting line and polygon
Great! You may want to submit your description files to @Victor Olaya (Sextante/Processing developer) and he will roll it into the release so others can benefit! – Darren Cope 29 mins ago
Sep
18
comment GRASS v.Overlay/QGIS Intersect Speed intersecting line and polygon
@BJEBN; unfortunately I don't have time right now to try a benchmark, but another thought may be to try the 64bit version of QGIS available as an experimental build from trac.osgeo.org/osgeo4w (assuming you're on a 64bit machine) and see if the processing time is any faster. Otherwise, you could add the GRASS v.split and v.overlay to the Processing toolbox - not that hard to do following the instructions here: fossies.org/linux/misc/qgis-2.0.1.tar.gz:a/qgis-2.0.1/python/…
Sep
17
comment How to calculate mean coordinates from big point datasets?
If you're on a 64 bit Windows machine, try the experimental build of 64bit OSGEO4W (trac.osgeo.org/osgeo4w) I've had good luck with it being faster/less 'crashy' on big tasks.
Sep
16
comment GRASS v.Overlay/QGIS Intersect Speed intersecting line and polygon
you should try a benchmark using OGR directly: darrencope.com/2011/03/31/clipping-large-shapefiles-using-ogr - you can use that in the Processing toolbox as well.
Sep
15
comment How to specify cost attributes for network analysis in QGIS using the GRASS plugin?
user21965: It looks like you're right. I agree with @markusN that it's a bug. Luckily you can do this easily via command line (see grass.osgeo.org/grass65/manuals/v.net.iso.html) and still visualize results in QGIS :)