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

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2
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1answer
21 views

Where to download QGIS 2.10?

Is QGIS 2.10 Pisa for Ubuntu/Windows already available?
0
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0answers
14 views

How to call the Qt UI of a script?

I'm pretty new in the python world, and I'm working with the python console inside QGIS (Master version on a Debian machine). I have written some scripts, all of them are in the same directory (e.g. ...
2
votes
0answers
13 views

QGIS - shp to dxf conversion problem while opened in Autocad

I have a group of vector files that I intend to convert to "DXF" format. But after the conversion, only contour lines(white lines in the red polygon) are not displayed in Autocad. I read some related ...
1
vote
1answer
15 views

Print composer - legend - graduated

I have a map with graduated symbology, with 328 unique values. I would like add a legend to my map (as in the picture), illustrating that light blue indicates low values and dark blue high values. I ...
1
vote
0answers
18 views

QGIS: drag zoom via keyboard shortcut/ mouse wheel?

to zoom to a rectangle in ARCGIS i always clicked and held the mouse wheel while pushing the control key. This was a very efficiant way for me to navigate through a map. Is there anything similar in ...
1
vote
0answers
29 views

QGIS - Simplification process creates a new polygon - how to avoid it?

I am trying to simplify a layer made of polygons. I have used different methods but the new simplified layer has a polygon which intersect with itself, thus creating a "new" polygon. Please see ...
2
votes
0answers
11 views

QGIS QgsLayerTreeGroup signal “currentLayerChanged”?

In a pyqgis context, I use the "currentLayerChanged(QgsMapLayer *)" signal of the QgisInterface class to do something when the current layer is changed, but I need now to do the same when I select a ...
1
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0answers
9 views

How to Change Precision of Export / Add Geometry Columns field

I would like to display the coordinates of a number of points on a map. I can use Vector > Export / Add Geometry Columns which adds coordinates to 6 dp. However as I am using a UTM-type projection ...
1
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2answers
18 views

QGIS Editing: move - both - nodes after Cut has been performed

I just ran into unexpected behavior while editing a polygon shapefile in QGIS 2.8.2. Scenario: A polygon: Then I cut that polygon into two seperate poygons: Then I use the Node Tool to move a ...
1
vote
1answer
23 views

How to completely uninstall and remove QGIS 2.8.1

I want to uninstall and completely remove QGIS installation from my computer(windows vista). I have uninstalled it and when i try to reinstall it says it is already installed on the system.
0
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0answers
15 views

QGIS import OpenAIP

I have files from OpenAIP (http://www.openaip.net). How can I import them ? Format available are : .aip .cup .dat .aip is xml file. For point : <OPENAIP VERSION="960678" DATAFORMAT="1.1"> ...
1
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0answers
10 views

Embed Sound in Leaflet Popup with QGIS

I was wanting to embed some animal sounds in a leaflet map my son and I are creating. Have images embedded, but would like sounds in the popup if possible. Like embedding images, can this be done ...
0
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0answers
13 views

How to create new field using the values of one attribute column multiplied by a constant number in Qgis or ArcGIS [duplicate]

I have point data that has a small length attribute - I want to times this length attribute by a constant number (I need to trial a few different constants) to find the diameter of a protection zone ...
1
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0answers
16 views

QGIS dissolve by attribute and retain primary polygon attributes

I have a parcel shapefile. Many of the parcels have been combined over time, but the shapefile still represents the original parcel boundaries. The attribute table has a field for the original parcel ...
0
votes
0answers
10 views

Loading geoserver WMS raster layer in QGIS python console

I am using the following snippet to load a raster layer deployed under wms service using geoserver, in qgis python console. I am getting False output. Any idea? registry = ...
1
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0answers
11 views

PyQGIS Standalone Crashes python.exe when zooming out too far / Process finished with exit code -1073741819 (0xC0000005)

I have the following PyQGIS Standalone App which is working fine so far. One little problem is that if I zoom out to the MaxExtent(by scrolling the mousewheel) the app crashes python.exe so that the ...
2
votes
1answer
23 views

Error: Algorithm not found (QGIS)

I wrote the following code using QGIS'API. import os from qgis.core import * import qgis.utils prefix_path = os.environ['QGIS_PREFIX_PATH'] QgsApplication.setPrefixPath(prefix_path, True) ...
2
votes
2answers
33 views

Easy Custom Labeling tool: How do I remove label arrows?

I am labeling a lot of features and the Easy Custom Labeling tool is helping me to move every label to the desired position. I also like that the tool adds arrows for labels that I moved but sometimes ...
2
votes
0answers
25 views

Can you load WFS uncached in QGIS

I think this might be a bug, but we've just installed QGIS 2.10 and the WFS seems to be working strangely. When you load a WFS which is not cached the system loads all the visible features as ...
1
vote
1answer
13 views

gsb projection file for qgis under MAC OSX

I'm trying to create a new projection inside wgis. The projection includes a gsb file. With the Windows OS is easy to implemnet that: you just need to place the gsb file inside the ...
2
votes
1answer
29 views

How to add a message bar to custom canvas?

There is a simple code to add message bar to main window in QGIS: iface.messageBar().pushMessage("Hello","World") My question is how to add bar to my custom canvas canvas = QgsMapCanvas() in ...
2
votes
0answers
45 views

Remove multiple fields from multiple shapefiles using a python script [duplicate]

I'm using the python console of QGIS 2.8.1-Wien. I have a shapefile with many fields in the table that I want to remove them. I tried to use this geoalgoritm as: ...
-2
votes
0answers
33 views

need information about openstreetmap (osm) [on hold]

I am looking for information or code sample to use OSM map I am working on a project that need to read OSM and to display it I intend to use the QgsOSMDownload and more But at this time i need ...
1
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0answers
18 views

import qgis.core problem with QgsFeature and QgsGeometry ImportError: DLL load failed: The specified procedure could not be found

I've tried several previous answers to similar questions - no luck. I've tried everything, nothing seems to work. This is the error I'm getting Traceback (most recent call last): File ...
0
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0answers
13 views

Qgis Time manager raster error

I would like to give a shot to the Time manager in Qgis with some raster datasets. I load 2 rasters (both single band, 32bit float). I add the first one in the Time Manager window with the start ...
0
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0answers
10 views

How to graph a line given a great distance (e.g. 100km) and the angle?

I'm new to QGIS and I'm trying to graph subduction zones and I was given the starting point (in latitude and longitude), the length (in km) and the angle (in deg). How is it graph correctly? I tried ...
1
vote
1answer
26 views

How to measure the distance between multiple points and multiple polygons?

I'm trying to find a quick and accuarate way to measure the distance between 3 survey sites and all the designated sites within 10km. The survey sites are on a point vector layer and the designated ...
2
votes
1answer
27 views

QGIS Heatmap values change when imported into ArcMap?

I am creating a heatmap layer from QGIS and importing the TIFF into ArcMap. When I import the file into ArcMap I notice that values are different. For example the max value in QGIS is 8.92454, but ...
0
votes
1answer
15 views

Semi Automated Classification plugin (QGIS) error when trying to create ROI

When I try to create a new ROI through Semi-Automated Classification plugin (SCP) for QGIS, I keep getting a message saying: "It appears that SciPy is not correctly installed. Please, see this page ...
1
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0answers
19 views

How to remove las2dem streaks from raster dem

I've created a series of DEM files using the las2dem tool from LAStools, however since I don't have a licensed version they have black streaks running across them. Does anyone know a good method for ...
-1
votes
1answer
31 views

Update Column in QGIS

I would like to update columns in QGIS something like making MAPINFO . Contains , is Within, intersects ) and get values ​​such as sum, avg, propsum , count Is it possible to do this with any tool in ...
1
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0answers
14 views

Normalized Difference Built Up Indice with a threshold value in QGIS modeler

I want to use the modeler in QGIS, model the NDBI with a threshold value in order to produce a binary image. positive values = 1 and negative values = 0 my question is about which tool I can use in ...
3
votes
1answer
39 views

Overlay Analysis in QGIS (or Preferably Python)

I would like to perform an overlay analysis in Python or QGIS to output a list of each shapefile that falls within certain boundaries. I have unsuccessfully tried to use the Spatial Join, Intersect, ...
1
vote
1answer
32 views

Interpolation extent

the following pics will hopefully explain my problem. After interpolation an clipping the grid I get the result you can see on the pic. Next to the boundaries there are a lot of gaps caused by the ...
1
vote
1answer
28 views

How to merge two lines of polygons?

In QGIS 2.6.1, I have merged two polygon shapefiles. After merge I am facing problem at boundaries.. So I thought of changing Polygon -> lines(manually deleting one of the line at boundary) ...
1
vote
1answer
19 views

How to show objects inside an area?

I have two different shape: point shape file with many elements area shape file with many regions I need to create a rule where I need to colur differently the points in some areas, but the areas ...
1
vote
1answer
35 views

Is there a way to set the character encoding for all layers at once?

I have to set the character encoding forall layers from system to UTF-8. Is there a way to change this in all loaded layers at once? I'm using QGIS 2.8.1 on Windows 7.
2
votes
2answers
48 views

Problem when opening a raster layer

I am a news user with QGIS API C++. In order to feel good with it I try some little program to explore class. I have download the tutorial 4 of the QGIS and adapted it to the 2.8 version but when I ...
1
vote
2answers
27 views

How to use r.mapcalculator to change values within a raster cost map to negative

I have created a cost map in r.cost module in GRASS (through QGIS). This is actually a distance map from a protected area and distance from protected area has been calculated in both directions. How I ...
1
vote
1answer
39 views

How can i fix the dock widget to the the Qgis window using python

I am creating a dock widget for my plugin and i want my widget to be fixed to the Qgis window. How can i do that using python programming?
1
vote
1answer
25 views

How to get programmatically selected layers from the QGIS legend?

My QGIS plugin exports all layers from QGIS to KML format. Now I'd like to export only selected layers. However, I can't find any hints in QGIS API. Is it possible to iterate over selected layers in ...
0
votes
0answers
12 views

How to import or reproject SRTM 30 sec DEM [duplicate]

I downloaded the global SRTM DEM from here. When I add the DEM as a raster layer (in my case topo30.grs file) the left/western edge of the file is at Greenwich and the right/eastern edge is at +360 ...
2
votes
1answer
32 views

PyQGIS standalone script does not work. Error “QGraphicsScene::addItem: item has already been added to this scene”

I try to test a PyQGIS standalone script which should just show one Shapefile. Sounds pretty simple but does not work. Here is my script: from PyQt4 import * from PyQt4 import * from PyQt4.QtCore ...
-1
votes
0answers
27 views

QGIS2Leaf help when trying to export

So when I try to export to leaflet I get this Error and I dont know how to fix it....I went in to QGIS2LEAF export and imorted all my layers and selected OSM basemap and clicked Full screen, selected ...
1
vote
0answers
30 views

Loading .shp file into QGIS gives error message

When I add vector layer I select the .shp file and nothing happens When I add vector layer and I select the folder it gives error message "not a valid or recognized data source" The pop up box queries ...
2
votes
1answer
44 views

Put png map image as a background to draw upon

I have an image of a fiber optics network map: I want to turn this map image (without any actual GIS data) into a vector map where each point is defined by lat, long. To do this, I'm trying to ...
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0answers
15 views

Lines > Polygon artifacts

I am trying to make polygons from a set of boundaries from an SVG file with closed polylines I downloaded off wikipedia. 1) convert SVG to DXF via Inkscape 2) import into QGIS (shows polyline data) ...
0
votes
0answers
27 views

NDVI from raster to vector isnt working

I have question...can I make from raster img. vector file via qgis? Because Ive tried it on NDVI image and Ive only got one file with atribut table full of #null. Image is from landsat7... ...
0
votes
0answers
21 views

Obtaining NDVI data from selected area

I need to analyse NDVI (-1/1) change between years (05-10y). But still only under selected shapefile. To analyse the extent of each NDVI category. Any tips? I have tried to make vector from the NDVI ...
1
vote
1answer
45 views

“Browse” button returns python error in QGIS

I use the latest version of QGIS (2.8.2) in MAC and have se the default Python version 2.7. Moreover, I have installed all the required python modules and GDAL. It was working before, but now, when I ...