Tagged Questions

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

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1
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1answer
37 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
21 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 ...
3
votes
3answers
91 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
38 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
1answer
43 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
53 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
1answer
37 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 ...
1
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0answers
40 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
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0answers
33 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
114 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
47 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 ...
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0answers
20 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
65 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
1answer
72 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" ...
2
votes
1answer
48 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 ...
3
votes
1answer
39 views

QGIS GRASS shell commands not working in Yosemite

First time asking a question here. Running GRASS 6.4.3 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
13 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
42 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
20 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
26 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
2answers
51 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
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0answers
36 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 ...
9
votes
2answers
115 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
37 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
77 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 ...
2
votes
1answer
65 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
57 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
29 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. ...
3
votes
4answers
365 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
52 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
35 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
65 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 ...
10
votes
3answers
226 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
47 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
34 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
32 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
149 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
21 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
54 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
15 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 ?
3
votes
1answer
86 views

How to make transparent the background of a WMS layer in Leaflet

I have inserted the following layer from a geoserver in the following Leaflet map : var nexrad = new L.TileLayer.WMS("URL", { layers: 'Wrecks:WrecksGreaterNorthSea', format: 'image/png', ...
3
votes
1answer
61 views

One vector data layer with different styles in QGIS

I have one layer of vector data that I would like to show in two different styles. Is there a way of accomplishing this in QGIS? I've solved it now by duplicating the the vector layer and add ...
1
vote
0answers
36 views

Error with qgis2threejs plug-in

I am currently endeavouring to use qgis2threejs to create a 3D visual using DSM and orthomosaic data captured using my unmanned aircraft system (UAS). Originally the plug-in seemed to work perfectly, ...
2
votes
1answer
14 views

How to obtain geographic points with a cdv file

I have a xlsx file with a column called CoordX and another with CoordY, I save the file in CSV format (semi-colon) and use the delimited text plugin and follow all the information in the text box. ...
1
vote
2answers
98 views

How to draw polygons in shapefiles

I've hit a snag and realize this is probably a very simple and basic question, but how do I draw a polygon in a shapefile that I've created from joined points of 2 .csv files? Which specific tool do I ...
2
votes
2answers
33 views

QGIS Forms - How Do I Display a Read-Only Value?

Older versions of QGIS had an "Immutable" option for form fields to make it obvious that data was read-only. How do I display values in the current version and make it obvious that they are ...
1
vote
1answer
81 views

QGIS's raster calculator— running as a batch process?

I have a series of raster files (150 or so) that I need to multiply by a baseline raster. Unfortunately, the series of rasters have a different cell size (30mx30m aka .00027777778 degrees x ...
0
votes
0answers
19 views

Extracted Contours from DEM translated in QGIS for certain intervals

I created a DEM from several point files in QGIS. Both of these line up well with the remaining data in my file (ie cadaster, aerial imagery, etc). I wanted to generate 2m contours from the DEM ...
1
vote
1answer
48 views

How to load a *.qgs file in a C++ QGIS standalone app?

I'm using QGIS-2.4.0 API to develop a standalone app by C++. I saved a test.qgs file in QGIS Desktop software, in the project, there was one layer and it was visible. Then I loaded the test.qgs ...
1
vote
1answer
43 views

Repetitive behavior in QGIS plugin in connection between Cancel button and pushButton

I'm trying to build a QGIS plugin where I need to ask for a file name using a pushButton connected with a QFileDialog object. I've built a simple plugin using the QGIS plugin builder (putting the text ...