Tagged Questions

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

learn more… | top users | synonyms (1)

2
votes
1answer
56 views

How to export lines from ArcGIS to be used in QGIS

After a big bunch of bureaucracy we have been giving green light to request government geodata. The requested data includes mostly seperate landplots, roads and rivers. We originally were told we'd ...
1
vote
1answer
76 views

Generate territory polygon from sets of points

I'm looking for a simple way to generate contiguous "territories" from sets of points. Say, points A, B and C are in territory 1, and D, E and F are in territory 2, then generate polygons that lie ...
2
votes
1answer
42 views

How do I select a point imported from a GPX file?

I imported several GPX files and added a raster basemap for reference. The GPX files contains tracks so the points are sequentially numbered. I'd like to identify one of the points so I edit the GPX ...
1
vote
0answers
19 views

How to find QGIS or QT or Python object definitions

I am attempting a simple plugin, on QGIS 2.6, using the available QT Designer installed I have successfully loaded a plugin, and can display a dialog box with widgets, within, and now attacking ...
1
vote
0answers
43 views

Permission denied when clipping raster

Trying to use raster extraction clipper to prepare a selected area of the map for generating contours - keep getting the error message: ERROR 1: TIFFOpen:everest_gmted30.tif: Permission denied ...
2
votes
1answer
56 views

Is it possible to render a large number of shapefiles to a pdf document using Python?

I'm extremely new to GIS, and recently made a map by loading a bunch of shapefiles into QGIS using a python script. However, it took 15 mins to scroll in or out on the image, and the pdf export ...
0
votes
0answers
42 views

QGIS vector edition corrupts SpatiaLite attribute table

I have a problem with edit SpatiaLite Layer on QGIS. When I make a this set of editions: cut line, delete a part, insert a new line and save it, the attribute table is corrupted. I was thought that ...
1
vote
0answers
18 views

QGIS Processing Toolbox: otb provider XML

Good day, I am trying to integrate an OTB application into the processing toolbox. MANUALLY created a XML file for it but get : Could not open OTB algorithm: ...
2
votes
1answer
58 views

Fuzzy maps with QGIS/GRASSGIS

How to do fuzzy maps (FUZZY module in IDRISI) with QGIS/GRASSGIS?
4
votes
1answer
70 views

Unable to see map in QGIS?

I am new to QGIS but used to ArcGIS. I am working my way through the tutorial and have downloaded a map from earth explorer - following all the instructions. The map is in the left hand panel and ...
3
votes
0answers
81 views

Is there any reason not to upgrade to Windows 8.1?

I have the option to upgrade to 8.1, but before I do I want to see if anyone has had any compatibility issues. I mainly run ESRI, but occasionally use QGIS, and other open source products. Has anyone ...
2
votes
0answers
40 views

How do I show the file path on a map?

Can anyone tell me how to show the file path of a map when I'm composing my final map figure. Kinda of like in excel in the headers and footers options where you can show the file path of the excel ...
1
vote
0answers
45 views

QGIS Crashes with OpenLayers plugin

I've just updated to QGIS Brighton on Ubuntu 14.04, and I've noticed that when I open Openlayers plugin, in order to load google layers, the whole program suddenly crashes. The only log I see, when ...
2
votes
0answers
51 views

Calculate area in square meters from degrees?

I have a polygon shape file in geographic coordinate system, i would like to calculate area in square meters in QGIS using python. Is there any formula or equation to do this? Thanks
4
votes
0answers
95 views

ESRI Personal Geodatabases in QGIS 2.6

I am having an issue loading any ESRI personal geodatabase in QGIS 2.6. I have a number of files that worked in QGIS 2.4 and having done the upgrade I can't open them in 2.6. I have tried this with ...
0
votes
0answers
14 views

Add ids to the merged features using python programming

I have written the python code that merge the features based on the area.But after merging the features it is not assigning ids to the merged feature.Can anyone tell me how to assign ids to the merged ...
4
votes
3answers
63 views

QGIS Composer thematic map : one (png, pdf, etc.) map per feature type

I've got a shapefile that contains thousands of features that can be group by categories. These features are sometime located in the same place so they overlap. An example of the content of my ...
2
votes
1answer
44 views

Convert Layer to Shapefile without losing Feature definitions

I have created a worldmap with custom defined Features, representing State/Zip-Code sales areas. I want to convert them into a Shapefile, so I can convert the Shapefile into a polygon definition file ...
0
votes
1answer
39 views

How do I measure the area difference between polygons in different shp files?

I have couple if shp files with 1000 polygons scattered in them (around 1k in each file) , each shp file represents a time frame (3 months period) and I want to show the a report with a progress of ...
1
vote
1answer
25 views

With QGIS Plugin Builder, receiving “ImportError: cannot import name”

While doing a first-time attempt to craft a simple plugin, I ran into the above error. I am using QGIS 2.6.0 for windows, the QT Designer that comes with that package, and the plugin builder plugin ...
2
votes
1answer
46 views

How to Export to DXF and retain elevations of contours using QGIS?

I have shape files for a whole county, and have created a base map in Qgis. What I do for my projects is zoom into the area of interest then export to dxf. The same procedure was used when I used ...
1
vote
0answers
20 views

How to fill empty pixel from DEM using QGIS?

Is it possible to fill empty pixel from DEM (hgt file)?) in QGIS ? When I load it, and zoom to a big scale, some pixel without any value appear. ( I have found a way using another software 3DEM on ...
4
votes
2answers
97 views

How to draw points around a circle in QGIS?

I've got a square origin-destination matrix with 23 elements, I would like to draw each one of these elements as a point around a circle, to achieve a result like the following: Can you suggest me a ...
3
votes
1answer
31 views

QGIS using the heatmapplugin from the console

I have to make a lot of heatmaps from csv's. Therefore I'm making a python script to run in the console. So far I can load csv's and save them as shapefiles. To get to the heatmapplugin I'm using the ...
1
vote
0answers
37 views

Regenerate contour lost parts

I have some countour datasets where some parts were cut by labels, like this: Can these parts be regenerated? What I've tried is to create a straigth line between the dangling ends, but there are ...
1
vote
0answers
54 views

PyQGIS cookbook seems out of date

I am trying to follow the http://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/ but it seems to be out of date, for example many of the raster methods no longer work as indicated or even ...
1
vote
0answers
25 views

DB manager not updating

I'm trying to learn how to use spatialite databases, so have made a few experimental ones. When I delete them, however, they still show up in QGIS's DB Manager. If I try to open them it comes up with ...
1
vote
1answer
30 views

Qgis Python console print statements not working

I have a small problem with the Python console in Qgis. I am working through some introductory tutorials on Python scripting for Qgis. I have a script that loads layers, then queries the canvas for ...
1
vote
1answer
29 views

Easiest way to add layers to QGIS [duplicate]

I have OSM data that I've loaded into a Spatialite database now what's the easiest way to get it to look like OSM? I shouldn't have to add and style each layer individually but I can't figure out what ...
6
votes
3answers
106 views

QGIS choose contour line labels

Is it possible to select only one contour line for labelling ? I have numerous labels for each line and I'll prefer to label only the main ones , such as "1000 m" and "1500 m" Thanks a lot
1
vote
0answers
27 views

WMTS Geoserver 2.5.2 - QuantumGIS

I am trying to configure a WMTS using the version 2.5.2 of Geoserver. It seems to be quite straight forward. The problem comes when I try to connect to the WMTS using QuantumGIS 2.6.0. I have access ...
2
votes
0answers
20 views

How to actually add the path to a file conatining a photo on a QT form using QGis/Postgis/Postgress

Simple newbie question as I have just designed my first QT form, after a frustrating afternoon search unsucessfully for the answer, help please. I have a spatial table in postgress, loaded into QGis, ...
2
votes
1answer
40 views

QGIS 2.6 - Point Sampling Tool plugin producing empty shapefile

I use a DEM file (*.tif) and a points layer. My need is basic : getting the Z value for each point by extracting them from the DEM. Both layers correctly opened with QGIS 2.6. The DEM returns a Z ...
2
votes
2answers
45 views

QGIS failing to complete clip or intersect

I have been trying to perform a intersect (then tried using clip) on a rather large dataset on QGIS. I have been able to complete similar geoprocessing using slightly smaller datasets and the layer. ...
3
votes
1answer
111 views

Export Model to python script in QGIS 2.6?

I just wanted to ask where the export model to python script option has gone in QGIS 2.6.0? Thanks
2
votes
2answers
42 views

Line Layer from Point to Point CSV file using QGIS?

My question is probably a basic QGIS question but I could not find something that would work for me. I have a file of the following format: where each from/to is a point that is already inserted ...
2
votes
1answer
50 views

Reclass in QGIS?

I'm new in QGIS and I'm trying to reclass a raster with reclassify grid values. I want to reclassify by table, however fixed table has only 3 rows and I need some more, but button to add is not ...
3
votes
1answer
39 views

Finding out corner shape in vector polygon file in Qgis

how can i findout and distinguish a corner shape in Qgis as shown in image?
3
votes
0answers
28 views

How to export two related layers to KML with multigeometry using QGIS?

From QGIS, I would like to create a KML file, for GoogleEarth, which contains multigeometry in that KML file. By example: consider two layers in QGIS -- the first layer contains polygons, and the ...
3
votes
1answer
52 views

Orfeo Toolbox (OTB) KMeans classification issues QGIS 2.4

I am having trouble processing an image through the Unsupervised KMeans image classification in the OTB Toolbox of QGIS 2.4. I have a .tif image in the Input Image box and keep all the defaults. When ...
2
votes
0answers
24 views

QGIS Error Adding WMS Layer

I want to add a WMS-Layer to QGIS. If I try it, I get the following message: "Antwort nicht verstanden. Der wms-Provider sagte: Eigenschaften-Abfrage gescheitert: Connection closed" It's a ...
1
vote
1answer
47 views

QGIS 2.6: GPX with 1546 records only reads 230

I have a gpx with 1546 waypoints. But: only 230 waypoints are read in QGIS 2.6 (using "add vector layer"), the rest is skipped. Can't understand why. File structure seems ok since the first 230 ...
3
votes
1answer
57 views

How to reproduce Smoothing from Generalizer Plugin in v.generalizer in Processing Toolbar using QGIS?

I´d like to reproduce the smoothing operations done with the Generalizer Plugin inside the v.generalizer Toolbox so I can use them on a polygon layer instead of only on a line layer. I tried ...
2
votes
1answer
35 views

Filter query error in QGIS2.4 or 2.6

I get this error when undertaking in query in QGIS2.4 or QGIS2.6: An error occurred when executing the query. The data provider said: OGR[3] error 1: Unrecognised field name ...
3
votes
1answer
42 views

Raster values - QGIS (Point Sampling Tool) vs. Surfer (Grid Residuals)

I have a grid/raster file, interpolated using triangulation method in Surfer (Golden Software). When I contour the file (either in Surfer or QGIS), the contours are basically identical. I have a ...
1
vote
0answers
16 views

Browse files in Python QGIS plugin [closed]

I have read this How to open the "File Browse" dialog in Windows from a PyQGIS plugin code? How can I do it in qt designer? Because I can't get longer than ok/cancel windows
1
vote
0answers
16 views

How to create contour lines from 4 hgt files? [duplicate]

Is it possible to draw contour line for 4 different .hgt raster in one operation ? If I load them to cover a large region, do I need to extract-> contour for each of them or is there a tool opposite ...
1
vote
0answers
43 views

QGIS shapefile layers to database geometry type [closed]

I have opened Arcgis shapefile with QGIS. And I used QGIS database manager tool to create table and import data to postgresql database. Database manager is creating and importing success. But there is ...
2
votes
1answer
83 views

How to create a Qgis python script to manipulate fields with some parameters?

I'm just beginning with QGIS. I have a shape file with 10 fields field1, ..., field10, and many thousands of data. I will like to automatize the next sequence (in a python script or a model): load ...
1
vote
0answers
47 views

Link QGIS to Anaconda Python Distribution: Spyder, iPython Notebook, pip, scikit-learn

I have Anaconda as my primary Python distro, and want to route Python related QGIS scripts through it. With Anaconda, I have Spyder, can easily install packages with pip, and can launch a iPython ...