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Results tagged with qgis
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user 47889
QGIS is a cross-platform GIS application licensed under the GNU General Public License.
1
vote
Export vector layer to raster in QGIS
Your Idea might work.
To create the column do the following:
right click on raster -> open attribute table
press the toggle editing pencil (Ctrl + E)
add column (Ctrl + W)
open field calculator and …
1
vote
1
answer
49
views
Correct long / lat referencing typo in vector layer
Is there any way to "retype" long/lat manually in QGIS or gvSIG? …
1
vote
1
answer
754
views
Extracting 1st level boundaries from GADM worldmap in QGIS? [closed]
I tried the dissolve function in QGIS on the 500mb GADM world map, but its not dissolving the entities properly. … It fails in 1 out of 10 because for example there are some single points remaining which QGIS recognises as borders.
Is there any solution to the dissolve problem? …
2
votes
1
answer
231
views
Actions undertaken in QGIS somewhere stored as Python code in a history file?
For practioners that are not willing to study all the methods for each class, it would be helpful if every action that was made within the QGIS interface can be looked up afterwards in a history file with … Is it available in QGIS as well? …
1
vote
1
answer
464
views
rendering a single band raster - new maxvalue
Via the QGIS desktop it works smoothly by hand via the Properties.
Via Python I was not able to figure it out. …
4
votes
Spatial join of raster data in QGIS
If you want to transform a raster file to a shapefile you can use the function "vectorize" in QGIS. … (both of them you find in the Raster menu point of QGIS desktop)
The specific commands you need then depend on the type of raster you have (multi / singleband) and the values you want to obtain. …
3
votes
How to calculate raster statistics for polygons?
zonalstats = qgis.analysis.QgsZonalStatistics(vectorlayer,rasterfile)
zonalstats.calculateStatistics(None)
calculates by default just Count, Sum and Mean (as you can tell from Raster -> Zonal Statistics in QGIS …
-1
votes
Merging rasters in QGIS?
That's a very brute force Version, but have you tried to polygonize them separately (computationally a bit of a burden of course) and then merge the .shp files and see if it works?
3
votes
1
answer
124
views
Vector differencing fails in QGIS (due to geometric errors)
In QGIS the result was that the overlapping regions - where the differencing should have taken place - were gone. I presumed it was due to wrong referencing of the UZB shapefile. … Has anyone an Idea what was wrong in QGIS? …
4
votes
1
answer
255
views
IPython plugin not loading in QGIS 2.12
I am trying to run the IPython console plugin in QGIS 2.12
After installing the plugin there is this error:
You need to install IPython 3.1.0 (and then restart QGIS) before
running this IPyConsole … Why is QGIS not be able to recognize that I have the correct version of ipython installed? …
3
votes
Accepted
Properter to get travel time as cost for network analysis
This is the properter that I put together from all the properter-examples that were posted. It works well. Note that the defaultSpeed is not used in my case (for peculiar reasons of my project), but i …
2
votes
1
answer
1k
views
Huge file size after averaging two rasters
After I average two raster files (singleband gray, initial size ~700MB each) through QgsRasterCalculator() with formula "Raster1@1/2 + Raster2@1/2" the size of the resulting file is 2.9GB.
Is there a …
2
votes
1
answer
647
views
QGIS Zonal Stats Plugin - Python Console - compute one specific statistic
I think this is more of a syntax problem that I have here. But I am absolutely not able to figure it out.
On a different Linux machine I got the following working:
zoneStat = QgsZonalStatistics (poly …
5
votes
2
answers
827
views
Properter to get travel time as cost for network analysis
I intent to stick to the standard QGIS network analysis though. … QGIS is crashing, so far I couldn't figure out why.
Does anyone know of another already existing properter somewhere that works? …