Tagged Questions

QGIS is a user-friendly, cross-platform GIS application licensed under the GNU General Public License.

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0
votes
1answer
8 views

Non-standard WMS parameters not sent in GetMap requests via QGIS?

I am coding a python plugin to QGIS that connects to the UK National Biodiversity Network (NBN) Web Mapping Service (WMS). In general, I don't have any problems doing this with the QgsRasterLayer API ...
2
votes
1answer
6 views

Error message: qgis_core.dll missing

I have a fresh install of QGIS 2.4. When trying to open a .shp file I get the error message below. I've followed their advice and have done several re-installs and also cleared all qgis files from my ...
0
votes
1answer
25 views

Gdal/QGIS resampling asc file

I have a DEM (.asc) file with a resolution of 1000 meters per pixel. Therefore the file has a lot of columns and rows. I would like to chance the resolution per pixel from 1000 to 3000 meters per ...
1
vote
0answers
11 views

QGIS: Make added toolbar's buttons exclusive

I've added a toolbar to the QGIS mainWindow. Also i've added some checkable buttons to the toolbar. How can i now make my checkable buttons untoggle on QGIS default toolbars' checkable buttons press ...
0
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0answers
19 views

Field Calculator QGIS: CASE WHEN

at first, sorry for my English. I'm using Google translator. I have a .shp file with attribute table. Like this... -- A -- -- B -- -- C -- QString Double Double Data ...
1
vote
1answer
16 views

How to find address in QGIS using openlayers plug-in?

Is possible to search for addresses using OpenLayers plugin in QGIS?
1
vote
1answer
19 views

Use QGIS plugins in custom standalone application

I am trying to create a QGIS custom standalone application. I want to add the Google Physical map from OpenLayers plugin to my application when it starts, but I cannot seem to be able to access ...
0
votes
0answers
9 views

Issues with reclassify for QGIS Saga Reclassify Grid Values tool

I am trying to reclassify a raster using the Saga Reclassify grid values tool in the QGIS Processing Toolbox, but am getting an unexpected entirely black raster. I have verified my original points and ...
1
vote
0answers
11 views

How to export a postgis table to a pbf file?

I need a tool like osm2po or osm2pgsql but that does the opposite thing, convert a postgis table to a pbf file. I think qgis can do this but I can't find that option.
1
vote
1answer
32 views

Show feature count of layer via Python console / PyQGIS

When working with vector layers in QGIS, I can display the feature count of a layer and, if applicable, the feature count per attribute category (e.g. when using categorized or graduated styling) via ...
0
votes
1answer
15 views

Running GRASS functions in QGIS 2.4 from python console

I am using qgis 2.4 and i am looking for the "easiest" way to execute e.g. the r.in.gdal function from the python console in qgis. Specifically for r.in.gdal, I could not found this function in ...
3
votes
0answers
16 views

Generate a series of ellipses on a line

I am trying to create a series of ellipses (mocked up in green below) of defined dimensions along a line. I have got as far as generating regularly spaced points along the line that are attributed ...
2
votes
1answer
27 views

Spatial join without operation on the variable of interest

I have a simple problem: I've got to spatially join records of an epidemic in forests to some plot coordinates I have gathered. Problem is, I cannot obtain the records for each year on each plot, I ...
2
votes
0answers
12 views

QGIS : cannot change the z-coordinate of a point shapefile using the wkb geometry format

I am using QGIS Desktop 2.5.0-Master with GDAL/OGR 1.11.0 on a windows 7. I am working on a little pyQGis script that should modify the z-coordinate of points in a vector shapefile based on a value ...
0
votes
0answers
10 views

Filter MapComposer legend to only show layers visible on the map

I have written a function in Python / PyQGIS (no standalone application, so copy/paste it to the Python console editor to run it) that takes a VectorLayer as argument, creates a MapRenderer object for ...
4
votes
1answer
42 views

Equivalent of excel Alt+Enter in attribute table?

On excel, you can do "carriage return", that is, jump a line, using Alt+enter within a cell. When I copy a cell from excel in my attribute table, this format is respected. I can find no way to write ...
1
vote
0answers
14 views

QGIS Deployment in Citrix XenApp - How to Remove Pyramids from the image “properties”

I'm working on deploying QGIS 2.4 into a XenApp 6.5 desktop environment. We've tested QGIS to see if it will run in our environment on a test server and have found that building Pyramids with Ariel ...
1
vote
0answers
22 views

Importing kml google earth polygons to QGIS

I've created some polygons in google earth, saved it to kml and then I loaded these files into QGIS. The problem seems to be the projection, these polygons are slightly out of the place. I've tried ...
1
vote
0answers
19 views

Issues with QGIS WFS editing/PostGIS rendering

I want to be able to view and edit spatial data within a postgis database. I have tried using a WFS with Geoserver - but constantly get 'Empty Response' error and the Network log says the request ...
3
votes
1answer
34 views

Will core functions in QGIS 2.6 exploit multi-threading?

After reading a recent post about introducing multi-threading to QGIS, I was wondering if QGIS 2.6 will include this when running various processes. I checked online and I could only find that ...
1
vote
2answers
27 views

Is it possible to export a XSD from a GML

I want to export a XSD from a GML. I already have the GML and I want to export a XSD that fits the GML For an ETL tool we've programmed, people have to deliver a GML, XML and XSD. Those people ...
0
votes
0answers
16 views

computing the volume of a cave

I did a cave survey and now I have a dxf file 3d. It's composed by 8 layers: polygonal points width contour width height contour height stations depth I would like to make a volume and change its ...
3
votes
2answers
59 views

Averaging XY data for locations in QGIS

I wanted to find out mean of the selected point using QGIS. I tried out selecting using attribute table but could not find an option for mean in field calculator. I have attached a screenshot with ...
1
vote
0answers
15 views

Use PyQGIS to import CSV and draw points using different color

A CSV file contains columns latitude, longitude and color. uri = "file:///C:/data/balls.csv?type=csv&xField=longitude&yField=latitude&spatialIndex=no&subsetIndex=no&watchFile=no" ...
1
vote
0answers
10 views

Add OpenLayers layer from QGIS's Python console?

On QGIS 2.4.0-Chugiak the Openlayers plugin is found under Web menu rather than the Plugins menu. How can you use the Python console to add a Openlayers Google Maps layer? The following code give us ...
2
votes
0answers
11 views

QGIS GRASS shell commands not working in Yosemite

First time asking a question here. Running GRASS 2.4.3 within QGIS 2.4.0 on Mac OS 10.10 Yosemite. I'm trying to run v.net.iso within the GRASS shell, but the following error is returned every time: ...
0
votes
0answers
11 views

Tracking Conversation Records using QGIS

I am working on a project that covers three small towns. I wanted to keep track of a large number of conversations I have with an equally large number of land owner. I have a GIS file set up in QGIS ...
0
votes
1answer
22 views

Integrate QGIS Server with existing Wordpress installation

How can I integrate QGIS Server with an existing worpdress installation? I have tried but cannot get capabilities to appear. Maybe something to do with Htaccess or httpd.conf but I cannot ...
-1
votes
0answers
18 views

I need to convert a kml file to a shp file without losing any attributes [duplicate]

I am unsure how to do this, I think that global mapper would do the trick but I dont has access to a supported computer. Every conversion technique I try doesnt transfer my attribute table from my ...
1
vote
1answer
20 views

QGIS 2.4: copying of points to another point layer

in QGIS 2.4 it is not possible any more to copy points of a layer into another layer - I get the message: " Fehler: Objektschreibfehler: Objekterzeugungsfehler (OGR-Fehler: Attempt to write non-point ...
0
votes
1answer
14 views

building GDAL with libKML support

I'm attempting to import a kml/kmz file generated using Google Tracks into my QGIS 2.4 system (built with GDAL 1.10). KML files currently lose all attributes, and as such I'm attempting to build GDAL ...
0
votes
0answers
18 views

QGIS web client mobile/tablet viewer

I have been looking at OL3-mobile-viewer as an option to make my maps more accessible. Unfortunately I cannot figure out what I need to change to hook it up with my existing QGIS server and ...
5
votes
2answers
62 views

Cleaning blocks pattern from urban LIDAR (blocks uplifted from streets)

We have a 1-meter LIDAR DEM from a city. A small subset can be downloaded from this link: This screenshot shows raw DEM with gray palette (darker belts are streets, and greyish and whitish ...
1
vote
1answer
29 views

Find lat/lng weighted midpoint from a list of points

Hello I would like some help on a specific task, I am a truck driver and I have an historical list of cities, lat/lng, count where count is the number of times that I've made a delivery in that ...
2
votes
1answer
55 views

Percent cover from overlapping shapefiles

Apologies if this has been answered elsewhere. I have tried for several days now to come up with a solution to this problem, but haven't found an exact answer that applies to my current situation (or ...
1
vote
1answer
35 views

QGIS select reversed geometries

I have a road network and a geometry for each road direction. One Geometry from A->B and another Geometry from B->A. This geometries are covering each other. Is there a tool available in QGIS to ...
1
vote
2answers
48 views

QGIS: Categorized styling - by multiple columns

I´ve got some polygons that I want to colourize by multiple columns. Can this be done or will I have to edit the attributes? Some polygons only have data-attributes in 1 one column, where as other ...
2
votes
1answer
25 views

multi-line attributes in composer

I have a multi-line text attribute in one of my layers, but when I try to display the data using the 'add table' function in Composer, it just gives the text a single line, not enough room to fit. ...
2
votes
4answers
176 views

How to create a new Shapefile with the same attributes as an existing one?

It is quite a frequent occurrence that I want the data I'm about to add to a new shapefile, to have all the same attribute fields as one I created in a previous project. For example, I might have ...
1
vote
2answers
46 views

Move coordinates using QGIS

With me I have a csv file. Am using qgis 1.8.5. I added delimited layer to a map shapefile in qgis. I noticed that some cooridates fell out of the boundaries of the .shp file. I selected the ...
0
votes
0answers
34 views

Free ebooks of QGIS [duplicate]

I am new to QGIS and python. Can any one tell me, where I can find QGIS and Pyqgis ebooks for free.
1
vote
1answer
50 views

Could not open/read USGS raster file

I could not open/read the following .img file. The document below says it is a raster file. http://edc2.usgs.gov/1KM/land_sea_mask.php I tried to open it using many ways such as Q-Gis software, and ...
9
votes
2answers
133 views

How can I parallelise embarrassingly parallel GIS operations in QGIS python?

A common requirement in GIS is to apply a processing tool to a number of files or apply a process for a number of features in one file to another file. Much of these operations are embarrassingly ...
1
vote
0answers
23 views

QGIS Upslope/Downstream Areas

I am trying to locate areas upstream and downstream of a point of interest in QGIS in order to determine possible areas of origin upstream and areas of impact downstream. I have used a DEM to create ...
0
votes
0answers
26 views

Syntax Error in qgsapplication file

I am trying to test an QGIS application code example. However, when I try to compile it, it is reporting errors in qgsapplication.h which is coming with the source code of QGIS. I am using QTCreator ...
2
votes
1answer
14 views

qgis-mapserver: GetCapabilities returns no layer

My problem is imilar to this thread I've installed qgis 2.4 and qgis server 2.4 on fedora. I created a simple project containing a vector layer (shapfiles) GetCapabilities request works but there ...
6
votes
2answers
97 views

How do I convert a tweet into a point in QGIS?

I've been doing some research on using R to datamine twitter, but I haven't really found an answer or a decent tutorial for my question. I'm interested in pulling tweets from twitter with a certain ...
0
votes
0answers
14 views

ArcGIS 10: How to mask a raster by using extract by mask tool If the feature mask is larger than the raster area?

I have a problem to mask the the raster which has values ranges -0.73106217384338 - 0.94593381881714. These values have been derived by using equatin (B3-B4)/(B3+B4) from Landsat band 3 and band 4 ...
2
votes
1answer
41 views

How to set default font in QGIS?

Is it possible to modify the default fonts to be used from "MS Shell Dlg 2" to another? If yes, where do I have to set it?
1
vote
0answers
10 views

How to get value and store it in a variable from a line edit or text edit in pyQT?

How to get value and store it in a variable (in main python plugin) from a line edit or text edit box that were created in QT designer ?