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
18 views

Why is there greyed dupplicated table in Add PostGIS Layers dialog in QGIS 2.X

Does somebody knows why PostGIS 2.X tables are duplicated and greyed in the "Add PostGIS Layers" dialog in QGIS 2.X.? One is coloured with geometry type recognised the other is greyed with unknown ...
6
votes
1answer
193 views

How to replicate QGIS vector smoothing effect in ArcGIS for Desktop?

You can see from the screenshots that QGIS has, in my opinion, much more pleasant on-screen rendering of vector features. I assume there is some sort of smoothing algorithm used in QGIS. Is there a ...
0
votes
1answer
49 views

How to install a Reporter plugin for QGIS?

I can not get the plugin Reporter or SimpleReport to run in 2.4 or 2.2. The plugin manager in qgis says there is no metadata.txt. This is obviously not true and is in there. I have changed the ...
1
vote
1answer
62 views

Layers not displaying in the correct order

I have a shapefile that is in my Layer tree above an aerial imagery layer. Yet, the map covers the shapefile with the aerial imagery. Any ideas how to fix this?
0
votes
0answers
56 views

QGIS Rasterization of points

I have a point vector layer and want to make it a raster. Trouble is that many points are very close to each other, so unless I specify a very small resolution of the raster cells, likely several ...
0
votes
0answers
85 views

How to choose which band is used to calculate DN when converting a raster to vector?

I currently have a raster layer of flood water levels (elevation) which I need to convert to a shapefile for future use. My raster is 4 bands: RGB + one band with values from 0 to 10, representing 10 ...
3
votes
1answer
228 views

Not able to save edits to vector layer in QGIS

I have a vector layer with about 200 features. So far I have been able to add polygons to this layer just fine, now it is giving me trouble. When I draw the polygon and try to save edits, the polygon ...
1
vote
0answers
76 views

How to set QGIS action to open and search for features on Google Maps?

At the moment, I have an action that takes each term in an address field and conducts a search on EACH term in Google (ie. multiple tabs are opened for each term). The action code I have is the ...
0
votes
1answer
219 views

QGIS: Multiply Raster Value with Pixel size

i'm working on a map with population densities. My raster data contains values as [People/square meter] for each cell. I have per capita values of energy demand etc. which I want to multiply with the ...
3
votes
1answer
135 views

Can QGIS table editor achieve similar results to Pivot tables in Excel?

Is it possible to achieve similar results to Pivot Tables in QGIS table editor so as to use just QGIS instead of several software solutions? Or are there maybe some plugins capable of achieving those ...
2
votes
1answer
446 views

Problems with the Clip and Intersect tool

I am having a problem with the clip and the intersect tool on QGIS Valmiera. I have a large vector map of sublocations of a country and am trying to clip them to a district level since I do not need ...
0
votes
0answers
70 views

Retrieving all towns/cities/villages within 2km of river path?

I need to find all the cities/towns/villages that are within a 2km range along a river path. So the solution I have now is to create a google custom map, and draw a polygon which will be 2km from ...
0
votes
0answers
46 views

QGIS 2.4: adding feature with setLineEdit() data not saving to database

A while ago, I struggled to get a combo box working correctly for QGIS 2.0. This involved transforming a combo box into a line edit if the item named "other" was chosen, enabling the user to add a ...
0
votes
0answers
54 views

Euclidean Distance Function performed on unprojected data

I am looking to perform a simple multi-criteria analysis on a data set comprised of two criterion: occurence of wildfires and road accessibility. First, the project CRS was enabled with "on the fly" ...
2
votes
0answers
87 views

Need help selecting strange line-like objects

I'm having a difficult time trying to select what seems to be a dead polygon. Does anybody know how do I get rid of those? select and delete operations. I'm attaching an image to help me explain ...
1
vote
2answers
307 views

How do I properly save/export a raster in QGIS? [closed]

I am trying to save edits to a raster file in QGIS, but; When you edit a raster file and select "Save As"; no output file is generated. My version is in Spanish; however "Save as raster layer" is ...
0
votes
1answer
149 views

Process to georeference corners of vector file?

I am new to QGIS and trying to wrap my arms around it so please bear with me. I have vector files (DXF) that I need to add back in the georeferencing. They were edited with Illustrator so I loose ...
0
votes
0answers
15 views

Python error with OpenLayers [duplicate]

I have recently downloaded QGIS 2.2.0. I am trying to use OperLayers, but I constantly get this message: Errore durante l'esecuzione di codice Python: Traceback (most recent call last): File ...
3
votes
1answer
225 views

Calculate population coverage?

I am relatively new to QGIS and hope I explain this right. I am looking at the percentage of an population that has geographical access to healthcare. Therefore I have one shapefile with village ...
1
vote
1answer
63 views

How to join two tables and convert joined table to a vector layer containing points in QGIS? [duplicate]

I have one table that contains 450 locations and a table that has 10'000 rows containing data and no spatial information. I have a column that allows me to join them. The issue is that I want to have ...
3
votes
1answer
195 views

Calculate distance between point and linestring and how to represent that on QGIS?

I have loaded my data with osm2pgrouting and I have my network with ways (Linestring) and nodes (Point). The problem is : I have a database of doctors addresses (point) and I should calculate the ...
1
vote
1answer
93 views

how to permanently add raster to satellite image in qgis

As mentioned in the title i need to integrate a raster to a satellite image but have no idea as to how to do this. I tried the add grid function and it works nice but is not permanent. I insert it ...
1
vote
1answer
114 views

System variable PATH overwritten in Qgis

The system env variable 'PATH' seems to be overwritten in Qgis, replacing it with their own values. Not sure if it was intended or not. Anyway in version 2.2, I could solve it by go into settings and ...
1
vote
1answer
45 views

QGIS - fix raster layer projection

I have a 2048x1024 PNG representing a WGS 84 projection of global data, where pixel 0,0 is lat 90 lon -180 and pixel 2047,1023 is (just shy of) lat -90 lon 180. When I add it as a raster layer in QGIS ...
0
votes
0answers
132 views

GDAL Installation help in windows

I'm trying to build a GIS application in Django Framework. I completed the GeoDjango installtion (postresql, spatial libraries). I installed OSgeo4W in my C drive. I also setup environment ...
0
votes
1answer
269 views

Converting a JOSM indoor map to QGIS

I have created an OpenStreeMap layer of the indoor of a bulding by following this tutorial: https://wiki.openstreetmap.org/wiki/IndoorOSM, since that is only a proposed tagging schema for indoor ...
1
vote
1answer
117 views

Where can I find AniMove in Qgis2.4

I have sucessfully installed AniMove by activating experimental plugins (yay! thanks gis.stackexchange). But I can't find it in Qgis! Yes I have activated it. Where is it? Is this a common bug? I ...
0
votes
1answer
70 views

Update OSM data already imported in qGIS

qGIS makes it really straightforward to import data from Open Street Map (there's a good tutorial here). However, despite this process is relatively straightforward, it takes some time to download the ...
1
vote
1answer
322 views

How to create WKT file readable by QGIS 2.4.0

I am trying to create a well-known text (wkt) file that can be imported into QGIS ver. 2.4.0 Here's a minimal working example of the geometry I wish to represent. POLYGON((-125 52, -125 21, -98 21, ...
0
votes
0answers
11 views

Adding (ir?)regular vector points

I run 2.0 qgis. (I am quite the rookie) I would like to add a point layer which is regularly spaced every 5 metres along the x-axis, and regularly spaced every 1m along the y-axis. I cannot seem to ...
1
vote
0answers
18 views

How to overlay an NOAA nautical map as a layer in QGIS [duplicate]

I am new to QGIS and am doing some work for a friend. He is hoping to overlay an NOAA nautical map as a layer in QGIS. My only real experience is with ArcGIS. He is looking to do something similar ...
2
votes
2answers
145 views

QGIS - exercise data

I´m working currently through the QGIS training manual. However, the data for the spatial analysis exercise in chapter 9.4 ...
4
votes
0answers
608 views

Connecting ArcSDE to Quantum GIS for dummies?

I really have a need to be able to connect to and edit ArcSDE data in Quantum GIS. This question has been asked before and apparently is possible, but the instructions are just not specific enough ...
0
votes
0answers
39 views

pyQGIS : Way in order to know modifications?

I 'm writing a pyqgis script. I succeed in accessing gis vector data (lists) from my remote server (thanks to urllib) . I succed in displaying geometries and attributs. 1/ Now, i would like manage ...
2
votes
0answers
35 views

PostGIS query with input from point layer

I have a table of rivers in PostGIS, each river linking to its outflow. I also have a QGIS layer of some selected sources, and would like to select the entire river downwards from each source (i.e. ...
0
votes
2answers
298 views

Is it possible to embed a Qgis map with all the information I added, in my website?

I am not a cartographer or geography student. I work in a network organization for developmental policy and I need a good software which enables me to record the cities in which our members work on a ...
2
votes
2answers
269 views

Auto populate field as concatenation of other fields

I'm searching for a way to automatically combine several field values entered in the feature edit dialogue, resulting in a new column comprised of the former values. I have, say fields A, B and C ...
1
vote
1answer
66 views

How to perform a spatio-temporal query in attribute table? [duplicate]

I am not good at programming, so I would ask for your understanding concerning my question. I have an attribute table that contains five columns which are: (Date, ID, Latitude, Longitude, Rainfall). ...
0
votes
0answers
44 views

QGIS style save issues

I have a map that I want to do graduated chloropleth maps for each year over 10 years, and I would like to use the same graduations for each year. I know this was asked earlier and therefore I know ...
2
votes
1answer
91 views

How do I save as .osm in QGIS?

The directions in http://docs.qgis.org/2.2/en/docs/user_manual/osm/openstreetmap.html#saving-osm-data seem to have been written before the OSM plugin was merged into QGIS proper. I can locate no OSM ...
0
votes
0answers
263 views

Converting multipart line into single parts using QGIS?

I have a shapefile in which a bunch of the lines are multipart. Sometimes this is due to joining ways that are not quite connected (gap less than a foot of real-world distance) and sometimes the ...
0
votes
0answers
102 views

UPDATE: QGIS print composer creates a map with gaps for WMS layers

I want to create some maps with qgis, unfortunately i cannot get good exports from print composer. The exported images (i tried many formats) contains gaps, it looks like a tiled wall mosaic with ...
1
vote
2answers
676 views

QGIS 2.4: plugin changes map tool canvas click behavior from 2.0

I had created a plugin for QGIS 2.0 to add new features more easily. It involves changing extents and updating snapping options along with triggering the default actionAddFeature(). However, I've ...
4
votes
1answer
3k views

QGIS - Create buffer in meters

I'm very new to the GIS world, so my problem could be very stupid, but I'm going to try anyway. Objective Given a list of coordinates in longitude/latitude, stored as a .csv file, I want to create a ...
0
votes
0answers
60 views

QT designer form default text ignored in QGIS when used with sqlite db

I'd like to populate a table with a custom form, for which I'd like some default text to be set when opening the dialog. I have two columns ('Name' and 'Description'), each with text that should be ...
2
votes
2answers
119 views

QGIS polygon centriods - How are they created?

I have been using QGIS to analyses spatial data and I created polygon centroids with the vector geometry tools. Now for a report I have to explain how these centroids were created. I have not been ...
1
vote
1answer
75 views

Opening Annotated shape files in QGIS

Ie've been given a number of files including some annotated shape files - Basically kilometre post markers and cable identification markers, to go with a polyline shape file. I was hoping that we ...
2
votes
1answer
746 views

Python support with QGIS 2.4 on Ubuntu 14.04

I recently updated my Ubuntu system to version 14.04. I added the sources and installed QGIS as per the directions on the QGIS website. Everything looks good, except for I do not have all the ...
1
vote
1answer
94 views

Problem loading the contour plugin

I have installed the contour plugin on my kubuntu 13 laptop, but when I am opening qgis (2.0.1) I get the following message: Couldn't load plugin contour due an error when calling its classFactory() ...
0
votes
2answers
126 views

How to read Oracle data with PyQGIS? (“identifier is not long” error)

Do you have any idea how load Oracle spatial data to QGIS with using the PyQGIS? Is it possible? I try: uri = QgsDataSourceURI() uri.setConnection("*host*", "1521", "*database*", "*username*", ...