Software plugins that add functionality to the QGIS package

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3answers
210 views

What is the math behind rasterization?

I'm taking the first steps in QGIS (version 2.2 Valmiera) and I am having some difficulties in knowing what mathematical criterion that QGIS uses when converting polygons (shapefile) to raster. I'm ...
1
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0answers
14 views

QGIS DBmanager import file append not working [duplicate]

I am using QGIS and connecting to Postgresql database. I want to import shapefile data into database table via DBmanager tool. But Append data to table selection is inactive like following image. I ...
-1
votes
0answers
31 views

what is the math behind rasterization? Doubt [duplicate]

In Figure 4 you can see how the overlap is not complete (marked with circles). What I would like to know which algorithm that QGIS uses the rasterization? What is your standard? Is there a percentage ...
1
vote
1answer
554 views

How to add the attributes of selected features to my new layer in pyqgis

I am trying to create a layer from the selected points coordinates. I am drawing a circle to the coordinate of selected points. I also need to add initial attributes of my selected features to my new ...
5
votes
3answers
972 views

no Get More in Plugin Manager in qgis 2 + ubuntu 13.04

After upgrade of qgis 1.8 to qgis 2.0 I couldn't find the choice "Get more" in Plugin Manager and I can't install plugins.
1
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1answer
221 views

OpenLayers Plugin with on-thy-fly-transformation causes wrong coordinates

I am using the OpenLayers Plugin with the maps from Google Satellite. In Qgis I have chosen on-the-fly-transformation into WGS 84. But the WGS 84 coordinates in Qgis are now 0.15 degrees further E ...
0
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1answer
126 views

Developing QGIS plugin on Mac - GDAL

I'm developing a plugin for QGIS called DEMtools. It runs fine on my linux machine, but is causing me headaches when run on Mac OS X Mavericks (surprise, surprise). I keep getting segmentation faults ...
2
votes
1answer
163 views

Python Error while installing QSpatiaLite in QGIS 2.0

I'd like to install QSpatiaLite to my QGIS2.0 but the following error massage occured while installing with the pluginmanager: Couldn't load plugin QspatiaLite due an error when calling its ...
0
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1answer
65 views

Errors uploading plugin to QGIS python plugin repository

I'm trying to upload my first plugin to: http://plugins.qgis.org/plugins/add/ I keep getting the following error: There were errors reading plugin package (please check also your plugin's ...
1
vote
1answer
103 views

How to open most recent directory using PyQGIS?

For example, when I add a vector layer, next time that I want to add another layer it opens up where I chose my last layer from. How would one implement this in Python and/or PyQgis? I'm writing a ...
1
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0answers
74 views

QGIS how to patch a plugin on local machine

I want to make a minor modification to a plugin (to change a field width in Table Manager). I edited the .py file and the .ui file and changed what I think are the right numbers but this seems to ...
1
vote
1answer
456 views

What exactly is the min/max of an extent? (QGIS heatmap plugin)

I'm having a hard time making the heatmap plugin do precisely what I want (namely, to make a heatmap showing not only points but an attribute of those points), and now I'm thinking that I may be ...
0
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0answers
46 views

Error opening Google layer in QGIS

I'm using QGIS to open my postgis layers based on Google Maps. But with some I am not having success, an error that generates a dump in the temp folder of my Windows user file occurs. To investigate ...
1
vote
1answer
335 views

Openlayer plugin in QGIS, error in projection 3857 Pseudomercator

I'm using QGIS plugin Openlayer to set the background of Google satellite under my vector layer. However, even if I project my layers as EPSG 3857 (the default and only possible projection for ...
1
vote
0answers
23 views

Is it possible to override default QGIS error messages?

From my QGIS plugin I would like to override/replace one of the the default QGIS error message ("The layer layer_url is not a valid layer and can not be added to the map") with my own message. I have ...
2
votes
2answers
755 views

How to set Eclipse and PyDev for QGIS when ArcGIS is installed?

I have got a lot problems with the configuration of Eclipse with PyDev in order to develop QGIS plugins. The situation is very weird and frustrating. I can import qgis module using Pyscripter without ...
2
votes
1answer
304 views

How can I make the topology checker plugin ignore very tiny errors?

I'm a QGIS2.0 user. Topology checkers is a very valuable for me as a data creator. I use this plugin for checking data quality. But, this plugin finds too much errors include very, very tiny ...
0
votes
2answers
83 views

It is possible to make snap using Google Maps based on QGIS?

Vectorized few lines using QGIS with Google Maps as a base. If I do not Trabachar with maximum zoom does not respect the topology of the base. It is possible to make snap using Google Maps based on ...
4
votes
2answers
2k views

How to Polygonize a polyline shapefile in QGIS 2.2?

When I used QGIS 1.8, I was able to transform polyline layers to polygon layers with the Polygonizer plugin. In QGIS 2.2, this function has been subsumed into the Processing toolbox. Unfortunately, ...
1
vote
1answer
63 views

Error in LineEdit when show parsing value as string

I m trying to make QGIS plugin to open xml, parse it and then show value i parse from xml to line edit, i use this code : from PyQt4 import QtCore, QtGui from ui_testparse import Ui_testparse import ...
2
votes
1answer
321 views

How to use Threads in PyQgis, mainly to keep UI active?

I'm trying to develop a plugin, which does heavy computations and as a result, user interface becomes inactive. I know that I should use threads to keep the UI alive (specifically, I have a progress ...
4
votes
1answer
265 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?
2
votes
1answer
95 views

How to edit a QGIS plugin GUI?

I have inherited a QGIS system from a former employee and my predecessor built a custom plugin for it. I now need to remove a single checkbox option completely from the UI for this plugin. Is there a ...
5
votes
3answers
344 views

How to export a Vector Layer with OGR2Layers Plugin

I'm using QGIS 2.0 Dufour on my Linux (Ubuntu 12.10).I'm download shapefile of Croatia country from this site (http://www.gadm.org/country) and i added a new vector layer where i created some ...
3
votes
0answers
63 views

How to include external libraries with my QGIS plugin?

I'm developing a plugin which makes use of "networkx" library extensively. However, networkx is not part of Python libraries pre-installed in QGIS. Is there a way to include this library with my ...
1
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0answers
59 views

Spatialite database creation problem (QGIS DB manager)

I am trying to create a Spatialite database in QGIS 1.8.0. Step one of instructions is: Right click on the Spatialite entry in the Browser tree and select Create Database. The Spatialite icon is ...
0
votes
1answer
48 views

Changing band for greyscale in plugin

I am trying to make a qgis plugin to change which band in a multiband data set (netCDF where the band represents time steps) is used for a grey scale rendering. The file works fine with manual ...
0
votes
1answer
216 views

How to export a map (satellite image, 3 bands) to Tiff without losing the resolution in Qgis.

I manually improve the colour contrast of landsat images. The printing in pdf afterwards is OK, as it maintains the resolution due to the high dpi. Now I am interested to obtain a kmz/kml file of the ...
1
vote
0answers
152 views

Programmatically modify layer datasource on project save event (QGIS)

I have a QGIS plugin which allows users to add WFS/WMS layers to the map. I would like to be able to scramble the user ID part (token) of the uri when the project is saved/closed and then use my own ...
7
votes
3answers
569 views

How to use ZonalStats plugin?

I am using QGIS 1.8.0 on a Windows Home Premium 7 machine. I have a single band TIFF that is 187 MB in size. My vector polygon shapefile represents a regular grid of a 147x112 36kmx36km grid cells. ...
1
vote
1answer
121 views

Unknown error concurring when developing QGIS 2.0.1 plugin in Windows 7

I am following the tutorial found here for developing a simple QGIS plugin within QGIS 2.0.1 installed on Windows 7. However, as I have began to try developing a link between the GUI and each the ...
2
votes
1answer
55 views

In what ways has QGIS 2.x API changed making Plugin Builder Tutorial invalid?

I am working on the QGIS workshop Tutorial for QGIS Plugin Builder and notice that it is for QGIS 1.1. As this seems like a popular tutorial, in general, what are some areas of this tutorial that need ...
1
vote
2answers
237 views

How to handle adding a PostGIS layer in pyQgis without saving password?

I'm writing python plugin and trying to find the right way to add PostGIS layer on the map without storing user password. After adding layer on the map, I strip out the password from uri like this: ...
0
votes
1answer
561 views

Replacement of QVariant and setAttributeMap in PyQGIS

I am updating a plugin for QGIS 1.8 to QGIS 2.x. I have the code below. The setAttributeMap does not exist anymore. I have replaced it with fet.setAttributes and it seems to work. When using ...
1
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0answers
47 views

Using QGIS ComboBoxManager: adapting for QGIS plugin

I'm looking for more guidance using the QGIS ComboBoxManager module (http://3nids.github.io/qgiscombomanager/). After finally getting the imports correct, I'm trudging my way through learning how to ...
1
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0answers
24 views

Why is node tool deleting unselected points in lines?

I am freehand editing lines to a shapefile on Mac QGIS 2.2.0, and have my snap settings at vertex and segment @ 20 pixels. The lines are roadways and I have merged them all into one feature and merged ...
0
votes
0answers
41 views

Error openlayers plugin in qgis [duplicate]

I did the following steps: I put the projection in 3857 and I enabled the project on the fly Open a vector shape layer in the projection 4326 I enabled the openlayers plugin Clicked enabled ...
1
vote
0answers
23 views

Query from plugin that shows result on Map and in Attribute Table

I'd like to create a plugin that performs a static (no user input required) query that, based on a condition, selects all the features on the map and displays these in the attribute table. I have the ...
3
votes
2answers
59 views

What is the closest CRS to “Meridiano de Greenwich”

I have a 1906 scanned map that I am trying to georeference in QGIS for Mac. The map has French and English lat-long, indicating them as either "Meridiano de Greenwich" or "Meridiano de Paris." I would ...
1
vote
1answer
1k views

How to create a dock widget correctly in QGIS plugin?

I am building a QGIS plugin and would like to use a dock widget. I have used QT creator to design the UI, with the object type being a QDockWidget. When the plugin is enabled in QGIS the dockwidget ...
7
votes
5answers
16k 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 ...
2
votes
1answer
345 views

How to update a QGIS plugin for new version (2.2)?

The updates to QGIS 2.2 have been fantastic and I'm really liking the improvements to the interface, features and performance. However, it seems that some plugins have not survived the upgrade. ...
2
votes
2answers
111 views

How to number points along a line consecutively

I have a line and along this line I have different points which are max. 20m away from that line. Now I would like to number the points along the line, like shown in the grafic. Any suggestions how to ...
1
vote
2answers
104 views

How to use eVis to launch AutoCAD with a relative path?

I found this post, which leads me towards what I need: How to link to external files with relative path in QGIS actions? Now, I'm trying to use the eVis plugin to open .DWG and .DXF by launching ...
0
votes
1answer
37 views

How to do a search in a line to a specific point

I'm using QGIS 2.0.1 Dufour. I'm working with a shape file made by a single line that represents a road with 30km. In that line I want to attach pdf files containing information about some points in ...
0
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0answers
69 views

QGIS plugin, extending plugin stub, instance has no attribute error

Update This is not an answer to why it does not work when the method is defined inside the class, but a workaround. Simply defining the method outside, prior to, the class (something that Evil ...
0
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0answers
144 views

OpenGeo Explorer connect to geoserver

Just a quick and easy question. I have installed OpenGeo Explorer as a plugin to QGis for publishing seamlessly to a web based geoserver (hosted through AcuGIS). I have pointed to the server through ...
1
vote
1answer
97 views

Purpose of “myPlugin_dialog.py” file created by QGIS Plugin Builder

I usually use QGIS Plugin Builder to create working templates for QGIS plugins. While a generic Python plugin needs the files below; __init__.py metadata.txt resources.py (translated from ...
0
votes
1answer
84 views

How to use ArcView GIS extension in QGIS or how to convert one to do so?

I really would like to know whether is a way to can work with ArcView GIS extensions at QGIS? or at least a way to be converted to plugins at QGIS?
0
votes
1answer
159 views

Threejs “Failed to generate a dem file using gdalwarp. gdalwarp is not installed.”

I am trying to test out the new threejs plugin for QGis and have come across this error. Failed to generate a dem file using gdalwarp. gdalwarp is not installed. I have installed the latest ...