Software plugins that add functionality to the QGIS package
12
votes
2answers
1k views
Visual Impact Assessment in QGIS or GRASS
Is it possible using QGIS or GRASS to perform a Zone of Visual Impact assessment? E.g. where can a 100m high structure be seen at a viewing height of 1.8m within 30km, taking into account elevation ...
11
votes
1answer
3k views
How to install a QGIS plugin when offline?
Due to various IT policies at my workplace, QGIS is installed on a machine that is not connected to the internet. I wish to install a couple of QGIS plugins on this system.
I have downloaded the ...
11
votes
0answers
250 views
Python Plugin Development in QGIS: How to access label text?
I'm trying to create some custom labels for point features in a QGIS point vector layer, and I want to write a python plugin to do it. We need our labels to be presented with color tinted rectangles ...
9
votes
2answers
639 views
Is there a way to use “Select by Attribute” in QGIS using a python command?
is there a way to use the function "Select by Attribute" in QGIS using a python command? In my plugin the user should enter a value via a GUI and this value should be used in a function which selects ...
8
votes
1answer
227 views
How to create a Human Trafficking Heatmap in QGIS?
I'm trying to create a heatmap with about 325 points distributed around the city of Houston. (FYI Houston is a major human trafficking in the US: a title shared with LA and Atlanta depending upon ...
7
votes
3answers
201 views
Howto setup and use a remote GIS workstation (QGIS,GRASS,PostGIS)?
I'm using QGIS (and sometimes GRASS and PostGIS) on my 2009 MacBookPro for my thesis project.
I was wondering (during an endless batch generalizing in QGIS) if I can set up a server so I can work from ...
7
votes
4answers
1k views
How to close watermarks window in QGIS Openlayers plugin?
I'm using Quantum GIS Ver. 1.7.4. I have upgraded openlayers plugin 0.7 to 0.9. However when I open google satellite, a watermarks/copyright dialog box "Data Peta@2012 ..." appear in the middle of the ...
7
votes
2answers
921 views
How to check Topology in QGIS?
I have two Shapefiles with Polygons ( City and Forerst)
Is there a Plugin who is able check the topology (QGIS)? Like "Knots do not overlap" or something like that? I dont want that they overlap.
...
7
votes
1answer
876 views
Unable to Install External QGIS Plugins
I'm using: QGIS version 1.8.0-Lisboa on Windows XP, installed using OSGeo4W
I am behind a proxy but I have configured it in Options > Network.
When I go to Plugins > Fetch Python Plugins..
All of ...
7
votes
2answers
194 views
How to run a spatial query with a raster and vector layer in QGIS?
I have a soil map (vector-polygon layer) and a map of the crops farmed in the same area (raster layer, from the US Cropland Data Layer).
I would like to calculate for a given soil type, the surface ...
6
votes
1answer
273 views
How to enable GRASS-modules in QGIS?
I have the latest QuantumGIS-1.9.0-master from Github with python-modules support and full GRASS-integration (GRASS-4.6.3-RC2) on Linux.
When opening the GRASS-tools plugin, it only displays six ...
6
votes
3answers
586 views
How to extract slope from topographic raster map?
I am working on a project for a machine learning class wherein I extract features from a topographic raster map and then classify the traversability of the terrain. One of the features I need to ...
6
votes
1answer
442 views
Is there a way to access QGIS plugins in Python?
Is there a way to access QGIS plugins in Python? I'd like to write a script to do some geoprocessing, and I'd like to use the clip, regular points and convex hull tools in fTools, as well as the Road ...
6
votes
1answer
100 views
QGis Making Column Value of Attribute table unique
For a shapefile, I have a field named id with the following contents in it:
1
1
2
2
I want to make these values unique such as:
1
2
3
4
Is there any way to achieve this in Quantum GIS (using any ...
6
votes
1answer
128 views
Jitter or Randomise Points in QGIS
Occasionally I'm asked to plot points that relate to sensitive data items. I would quite like to be able to add a varying level of random jitter to points when plotting so that point density is still ...
6
votes
1answer
60 views
How to get info from selected object?
I am new to the Quantum Plugin development and wonder if there is more information about the following.
I have added a shape file and am (off course) able to select a point from this shape file. In ...
6
votes
1answer
651 views
How can i create sectors for telecom towers
friends i am seeking advice from the GIS community
I work in the Mobile networks industry and i took up a task to create a plugin for QGIS using c++/python that does the following:
step 1: Create ...
5
votes
3answers
304 views
How to programatically check for a mouse click in QGIS
I want to know how to check for a mouse click in QGIS. I am trying to write a python plugin and want to provide functionality similar to the "Select Single Feature" tool that already exists in QGIS.
...
5
votes
3answers
1k views
How to access QGIS Plugin Repositories from behind a proxy?
I have been trying to teach myself QGIS by using this forum and others to help. Most of my questions can be answered by downloading plugins that are available through 3rd party repositories but for ...
5
votes
1answer
115 views
How to create a dropdown menu in QGIS Toolbar with Python
I Have a set of some QAction in my QGIS-Plugin and they are created and added to the toolbar like this
icon = QIcon(":/action1.png")
self.action1 = QAction(icon, u"Action 1", self.iface.mainWindow())
...
5
votes
1answer
154 views
How to transform a selected multipart feature into singlepart features while editing in QGIS?
There are several questions and respective answers for how to make a multipart features Layer into a singlepart features one using QGIS:
How to break a single polygon into multiple polys?
How to ...
5
votes
1answer
132 views
How to debug a QGis python plugin
I'm trying to write a python plugin for QGis. I'd like to debug some DB queries and I need a way to display the result.
I thought about using a popup to display it, but I don't know how to show a ...
5
votes
1answer
150 views
Simulate (Mock) GPS Tracks
I have the following scenario:
1) I need to create GPX files for use in testing of a mobile device.
2) The tracks to be described within will span large distances over long time periods (i.e. it's ...
5
votes
2answers
558 views
How to split an irregular polygon into equal areas?
I am a surveyor and use QGIS for maintaining soil test records on civil projects and am constantly provided with test lot area or number of lots required. These are more often than not irregular in ...
5
votes
2answers
318 views
How to filter the MouseWheel event in a QGIS C++ plugin?
I’m developing a C++ plugin for Qgis and I want to filter/override the mouse-wheel event.
I created a “maptool” to select a polygon feature on a vector layer, the feature has two attributes : an id ...
5
votes
1answer
115 views
CAD Like functions in QGIS
Is it possible for a script to be built that will use a reference point and have it draw several polygons based on distance and bearing, then assess the terrain under the polygon for highest obstacles ...
5
votes
1answer
114 views
Is it possible to grow QGIS symbol size over time?
I've got a data set of people movements within my municipality. (between points of places)
I've managed it with the plugin for QGIS 'time manager'. Over time people come and go, and based on a count ...
5
votes
1answer
440 views
Issues Accessing ESRI File Geodatabase within Quantum GIS Desktop
I am trying to access ESRI file gdb from Quantum GIS. I am on Windows 7, 64-bit. I have found many useful threads on how to set up this functionality within Quantum GIS. The method I went for is ...
5
votes
1answer
307 views
Where can I find documentation on QGIS C++ Plugin Development?
Is external C++ plug-in support available for QGIS?
I'm having a really hard time getting started here. I followed the doc here: ...
4
votes
5answers
7k views
How to install Openlayers plugin on Qgis 1.8?
After having installed Qgis 1.8 i am not able to find the Openlayer Plugin. In "the old days" I know I was supposed to check "add 3rd party repositories", but that button has disappeared? I tried ...
4
votes
2answers
109 views
Creating space at intersection of two links
I have a shapefile consisting of two links which are crossing over each other.
I want to create an empty space at the point of intersection of the two links.
As of now, I have been manually doing ...
4
votes
1answer
81 views
Where to report QGIS and QGIS-Plugin bugs?
I often find bugs in Qgis and its Plugins. I would like to ask about this on the internet but I do not seem to find the proper place to address this issue.
Are there any instructions?
4
votes
4answers
113 views
How to display a “Save As” dialog for raster files?
I'm writing a QGIS plugin in python. I need to show a "Save as" dialog window in order to allow the user to select the path of the output raster file. Do I need to create a QFileDialog and manually ...
4
votes
1answer
152 views
Surface covered by buffers in QGIS
In QGIS, I have plotted buffers around points. I would like to calculate the area which falls under buffers without over counting due to buffer overlaps.
Is there a quick and easy way to do this?
4
votes
1answer
571 views
Plugins are not installed in qgis 1.8.0 Lisboa
I am trying to install plugins in qgis1.8.0 Lisboa but error message is appear as follows,
Failed to unzip the plugin package. Probably it's broken or missing
from the repository. You may also ...
4
votes
1answer
435 views
How can I add OpenLayers layer from the python console?
I am new to the python console.
How can I add a layer from the OpenLayers plugin from the python console?
Thank you
4
votes
2answers
691 views
How to configure 3rd parties for the sextante plugin in qgis?
I'm currently exploring the enourmous potencial that the sextante plugin for qgis has to offer. The model builder will surelly be a very handy tool.
The problem is I'm not beeing able to run 3rd ...
4
votes
1answer
62 views
Is it possible show the feature attributes dialog when I add a feature in code?
I want to know if it is possible to make the feature attributes dialog in Qgis show up when I add a feature by code using:
QgsVectorLayer::addFeature( tFeature )
This is available when I add ...
4
votes
1answer
173 views
How to Create a raster layer from a numpy array using pyqgis?
I am working on a plugin for Qgis to calculate spatial Kernel density maps. I have all the calculations working, all I am missing is a way to turn a Numpy Array, with density values into a multiband ...
4
votes
2answers
454 views
Generate random points in selected areas for
I think my question is answered in different posts but I can't really make sense of them.
Background: We are designing a survey of a sample population of farmers to identify the seeds they use. I ...
4
votes
1answer
57 views
How to deliver an additional Python Library with own Plugin?
For my own plugin I need a special library (pyexiv2) to write a comment into a jpg file (PIL does not do that).
When I want to share my plugin in one of the repositories in the future, what would be a ...
4
votes
1answer
264 views
How do I maintain a resposive GUI using QThread with PyQGIS
I have been developing some batch processing tools as python plugins for QGIS 1.8.
I have found that while my tools are running the GUI becomes non-responsive.
The general wisdom is that the work ...
4
votes
1answer
55 views
Can I add entries to the layerlist context menu?
I am implementing a python based plugin for use with QGIS 1.8.
Most of it's user interface is contained within a QDockWidget but there are some layer specific controls I would like to append to the ...
4
votes
2answers
110 views
What is the fastest way to iterate through a list of features?
I have written a QGIS plugin and it iterates through all features in a layer using provider.select() and compares geometry. The problem, the plugin is very slow. If there are 114 features in a ...
4
votes
1answer
703 views
Is there a way to export QGIS layers to KML?
has had anyone had any luck with the new experimental plugin qgis2kml?
I keep getting the error msg layer : format not yet supported
I had a look but the author has not provided any documentation, ...
3
votes
2answers
675 views
How to reproject a vector layer in QGIS?
I have some shape file which is in UTM. I wanted them to convert to Decimal Degreesin QGIS.
Hope I can get some better response..
Thanks.
3
votes
3answers
2k views
How to install Python libs for XYtools to read Excel files
I need to use the XYtools plugin to read an Excel file. After choosing the XYtools incon and indicating an Excel file to read in, a message appears "there is a problem with loading a python module ...
3
votes
1answer
395 views
Get a pixel value
How can i do this operation:
I want to get a pixel value fro the satellite image (Landat, GeoTIFF, 7 bands) using qgis-python.
What operators should i use? (for example in qgis's Python Console)
...
3
votes
1answer
184 views
QGIS - export a project with dependencies
I was wandering if there was a way to save a specific project with all layers as dependent files to make it easy to share with collaborators.
for example, create a zipped or non-zipped folder ...
3
votes
1answer
103 views
Save Visible WMS layer to file
Is there tool to save currently visible WMS layer to file in QGIS, or some place in QGIS where you can get needed xml to fetch it using gdal ?
