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

learn more… | top users | synonyms (1)

0
votes
0answers
64 views

Snag loading Gdal 1.11 for Qgis 2.2, on a Mac

Can't load Q2.2 on a Mac without Gdal 1.11. but when I try to load 1.11 'Complete' version, it fails and gives me an error message to contact the developer. Anyone else had this kind of trouble? ...
2
votes
0answers
64 views

QGIS is not working with Postgres Plus Advanced Server

We have a problem to integrate GIS software with our GIS database which is populated on Postgres Plus Advanced Server 9.2 from EnterpriseDB. We are using QGIS to maintain and analyze our GIS ...
0
votes
0answers
20 views

'QgsGraph' object does not support indexing

Traceback (most recent call last): File "/home/kasun/.qgis2/python/plugins/floogin/floogin.py", line 246, in findRoutes path=self.astar.astarSearch(graph, start, end) File ...
0
votes
0answers
28 views

Change in behaviour of layer extents

I have a class that inherits a vector memory layer, it all works fine a previous version of QGIS, but on 2.2 it no longer works. It either does not know that the layer is WGS84 or getting the extents ...
0
votes
0answers
48 views

How to provide one label for multiple polygons?

QGIS 2.2 provides a great deal of control through the labeling override expressions, but I don't understand what variables I can use to generate a single label for multiple polygons with the same ...
1
vote
1answer
30 views

Is there a way to use a variable in a rule-based style?

I have several symbol layers: current: "from" <= 1832 AND "to" > 1832 former: "from" <= 1832 AND "to" <= 1832 future: "from" > 1832 What I'd like to do is be able to change 1832 to ...
0
votes
0answers
50 views

Draw polygon shape via Qbutton

Ideally; a Ui Qbutton is needed that will activate map canvas editing to add a polygon via the classic mouse click rubber band method. Upon a concluding right click with the active tool, editing ...
4
votes
2answers
645 views

Postgis 2.1 error after update

After a usual update progress - "apt-get upgrade" - I can not connect with qGIS to my PostGIS DB anymore. Error in the qGIS logfile: Your database has no working PostGIS support. Erroneous query: ...
0
votes
0answers
71 views

Issues creating slope raster layer from a point layer

I'm trying to create a slope raster layer using QGIS 2.0 on Windows XP. I started with a points layer with the Z elevation attribute. I then used the interpolation plugin to create a DEM. But, ...
0
votes
1answer
57 views

Labels disappear zooming IN in Qgis 2.2 Composer?

I have a simple map with a polygon Layer of 2 Polygons. Labeling is turned on, so is the option of "Show all labels for this layer, even if they collide". In the print composer the labels keep ...
1
vote
1answer
114 views

QGIS Print Composer with ESPG:32615

I have imported a PostGIS layer as the only object into my project and set the project and layer CRS to EPSG:32615 (UTM Zone 15N). My layer appears just fine in the work area. When I try to create a ...
0
votes
0answers
64 views

km measurement in qgis with EPSG 4326

I'm struggling with a small issue. I'm working with the master version of QGIS and I have some layers loaded in my project. All the layer are in 4326 projection and the on the fly option in NOT ...
0
votes
1answer
44 views

Piechart of a text column from attribute table in qgis

I have this problem: I would like to create a pie chart from a column of a attribute table, and I would like to see this pie chart above the map. The column contains names not numbers (I think fields ...
2
votes
1answer
68 views

Referencing Qt UIs external to plugin with python

I'm developing a plugin that sets up a working environment for a user: loading layers (from db), applying styles and several custom designed (Qt) UI files etc. Primary user interaction is in the ...
0
votes
1answer
66 views

How to georeference a map - which is in projected coordinate system - using geographic lat long? [duplicate]

We have some hard copy maps which were projected in Gauss Kruger coordinate system (in the legend it has been mentioned). But, the coordinates were given in Geographic lat long (Beijing 1954). In ...
1
vote
2answers
182 views

Replacing raster values in one raster with another raster in QGIS … how to?

I have a raster (DEM) and want to replace a few cell's values with the values from another raster in QGIS. I would have done this with the "over" tool in the raster calculator in ArcGIS. Specifics: ...
0
votes
2answers
87 views

Geo- referencing Projected coordinated raster with GCS - ArcGIS

I have raster displaying Lat/ Long grid, but map information shows that, it s been mapped in Gauss Krugger projetion/ Beijing 1954. So, technically we need to geo reference the map in Gauss Krugger/ ...
0
votes
1answer
55 views

QGis and Geomedia via Oracle

When I use both QGis and Geomedia to digitize in the same layer I get some issues in my Oracle table. It looks like Geomedia save my point, lines and polygons as ARRAY, while QGis save it like POINT ...
2
votes
1answer
36 views

Selection of points not showing on top (QGIS 2.2)

is there a way to bring the display of the selected objects on top? I have a large numer of points with a lot of them on top of eachother. When I make a selection through an expression and zoom to the ...
0
votes
0answers
59 views

Where can I find a comprehensive overview of QGIS geoalgorithms?

i am looking for an overview of processing toolbox / qgis geoalgorithms tools unfortunately the link http://www.qgis.org/de/docs/user_manual/processing/toolbox.html seems to be dead. SEXTANTE ... ...
0
votes
1answer
38 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 ...
0
votes
0answers
46 views

How to cluster points based on both proximity to each other and proximity to another layer (roads)?

Using QGIS I have managed to created cluster for points based on their proximity of each other (using buffer and spatial joins etc), but I would also like to add another variable to it: proximity to a ...
0
votes
0answers
57 views

Split Lines with Points Layer Tool

I asked a question a while ago to figure out how to split a line layer with a points layer using QGIS, but cannot, however, get the accepted answer to work due to limitations of my knowledge and the ...
0
votes
0answers
13 views

Rotating points at intersections toward branching vector

I've successfully rotated points on based on the azimuth of a line, following the lead of this post. However, I now have reached an obstacle for one of my layers that occurs only at line ...
0
votes
2answers
47 views

Can't get dataProvider object outside of QGIS python Interpreter

Within PyCharm import qgis.core as qgis vector_lyr = qgis.QgsVectorLayer("Point", "distance nodes", "memory") pr = vector_lyr.dataProvider() print pr prints None Within Python Interpreter in QGIS ...
1
vote
2answers
81 views

How to compute percent of a field

I have a layer with a column conaining population values. I want to write an expression to compute in a new field the percentage of population each polygon has in relation to the total population. I ...
0
votes
1answer
62 views

Coordinate grid not showing in Composer

I went through every answer that I found here, but am either missing something in them or the question has not been asked. I have a very simple map consisting of four layers, namely contour lines, ...
4
votes
2answers
91 views

Storing SRID:4326 data as Geometry or Geography?

I used OGR2OGR to import SRID 4326 point data into MSSQL Server. Didn't realize that it defaults to creating a geometry column instead of detecting the data as 4326 and creating a geography column. ...
1
vote
2answers
61 views

How to get a set of all buildings of an OpenStreetMap section in form of single points / Multiple polygons as one point

The objective is to get a set of all buildings of an Open Street Map section in form of single points in a shapfile. I downloaded the section from osm. Imported the section into QGIS (and later ...
1
vote
0answers
84 views

Open PostGIS layer with QGIS 2.2

I just upgraded QGIS from 1.8 to 2.2 and I am getting some troubles to open a PostGIS Layer. The connection with the server works fine, I can see all my tables, select the one I want to open and even ...
1
vote
2answers
96 views

How to align/georeference distorted vector layers in QGIS?

I've got a shapefile which has been digitized from a strongly distorted historical map, and would like to align it as nicely as possible to another precise shapefile layer. The transformation must ...
0
votes
1answer
85 views

How to create a grid after merging shapefiles?

Follow up question to QGIS Model Builder Script - Possible to merge layers in a folder? I think I'm missing something very obvious here but can't seem to find it. After merging shapfiles in a folder, ...
1
vote
1answer
47 views

Why is “Add feature” of the GPS Information tool inactive for some of my PostGIS layers?

Sorry If I rise it again on this forum but I couldn't find any info on limitations/requirements of "GPS Information" tool for QGIS (2.2.0) against data layers. For some layers I'm able to collect ...
0
votes
0answers
52 views

Is it possible to use custom (non-circle) buffer shapes?

I have a shapefile containing points. I'd like to replace each point by the same shape, centered around the point, like the "Buffer" tool with shapes other than circles. How can I do that?
2
votes
1answer
45 views

Where do I find additional instructions for QGIS print composer?

QGIS Print Composer has numerous complex interacting features. Scale vs paper size vs map extent vs QGIS main window map extent - locked layers - resolution - map rendering level (i.e. the scale used ...
2
votes
1answer
104 views

Can I draw free hand figures in QGIS?

I would like to add free hand drawings to my map. I tried the "Rectangles Ovals Digitizing" plugin but am looking for a free hand (not rectangle or circle) tool. Also is there a plugin similar to the ...
1
vote
0answers
60 views

Merging shapefiles to one, rearrange columns?

I am trying to merge two shapefiles which both contain polygons representing properties in QGIS 2.2. One problem is that the names of some of the columns in the attribute table differ between the two ...
0
votes
0answers
40 views

Running algorithm from Processing takes much much longer time than doing it from Qgis GUI

I have a road layer with 32000 features, and I want to find all the intersections. when I use processing->SAGA -> convert polygon/line vertices to points, it is all done in less than 5 seconds. ...
0
votes
0answers
25 views

Geocode addresses several QGIS

I am using Qgis and I have a excel file fields with direction and it fall geocode these addresses example address apartment township 1 calle 2 avenida Guatemala Escuintla 4 ...
2
votes
0answers
64 views

No tables listed in connection to MSSQL 2012 in QGIS

I've (finally) made a connection to my MSSQL 2012 database, but no tables are listed. Here's the tree view of the connection, and the connection properties: Some notes and questions: I've read ...
3
votes
2answers
154 views

Combining MS Office with GIS

I would like to incorporate MS Office into my GIS program. I have been using QGIS and was wondering if this would be possible? I am trying to create a one stop shop for my staff to be able to ...
0
votes
0answers
48 views

Convert to DXF not displaying correctly in CAD

I am trying to export to DXF in QGIS 2.2.0, when I import in (AllyCAD 3.6) the shape of the polygons do not match my reference shape. I presume it has something to do with projections, but I have ...
1
vote
1answer
94 views

How to get the map canvas CRS in EPSG code?

This is probably a simple request but I cannot find a way around it: how can I read from python the map canvas CRS? I know how to set it up: canvas = self.iface.mapCanvas() ...
0
votes
1answer
39 views

How do add attributes from shapefile to list of lat/long-coordinates using QGIS?

In QGIS I have a csv-file which contains lat/long-coordinates and population data for each coordinate. I also have a shapefile containing certain regional districts, in my case US counties. Now I ...
0
votes
0answers
28 views

QgsFeatureRequest and QgsVectorLayer are missing in the QGIS

I am trying to use part of my friend's code in eclipse written in Python using QGIS APIs. I have installed the QGIS 2.2.0. now before running the code, it seems that something is missing here. All ...
0
votes
1answer
36 views

Conditional formatting of grid cells based on specifict attribute

I'm using QGIS. I have a 29x30km grid. Every cell of the grid has its ID and every cell of the grid has an attribute "Population" ranged from 0 to 30000. What I would like to do, is to get some kind ...
2
votes
2answers
116 views

Auto fill second column with predefined names depending on first column (QGIS)

I want to create a point layer. In the attribute table I want to have two columns. In the first column I want to type an abbreviation like A. Then I want the second column to be auto filled with ...
1
vote
1answer
59 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 ...
0
votes
1answer
48 views

Changing $id in a shapefile in QGIS

I need to change the id (feature.id() in the python API or $id in the field calculator) of for features in shapefile layers in qgis, and I need to do it in Python. Is there a way? I tried something ...
0
votes
1answer
66 views

Georeferencing PNG against Google maps with openlayers plugin

I am trying to georeference blueprints to the footprint of a building. I'm using the Google Satellite image from the plugin to do this. The blueprints are rotated about 30 degrees. When I run the ...