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

learn more… | top users | synonyms (1)

2
votes
1answer
27 views

Reprojecting from Wagner VII using QGIS

I have a shapefile in Wagner VII projection (well, the proj4 string really only is: "+proj=wag7 +datum=WGS84 +units=m"). I'd like to reproject it to WGS84 (EPSG:4326) using QGIS 2.6. However, when I ...
1
vote
2answers
71 views

Looking for guidance to create a hydrological map with QGIS and/or GRASS

I have QGIS and GRASS installed . Basically i need this program for making maps something like this: https://www.youtube.com/watch?v=5HuPX7JS7ZA I downloaded DEM from ...
0
votes
1answer
60 views

How to label line features using python code?

I used the following code to label the line features(roads) in a layer.It works in the console, but not by python code(application) It works for the points too. What did I do wrong? Any help would be ...
2
votes
1answer
31 views

How to label states in QGIS with county-level shape

Hi I want to label state names in QGIS but my original shape file is built in county-level. If I simply label them with ``State'', my map shows multiple labels in each state as my original file (one ...
2
votes
3answers
98 views

Which monitor for working on printable maps?

I have a 24" monitor with a resolution of 1920x1080. Mostly I'm working on printable maps in QGIS. The size of some labels is sometimes smaller then 5mm on the final printed map. At my monitor this ...
0
votes
0answers
23 views

Is it normal that the installation of QGIS removes some graphical packages (12.04LTS)

When I install qgis with qgis.org deposit or ubuntugis ppa, apt wants to remove all of these packages : The following packages will be REMOVED: libgl1-mesa-dri-lts-quantal ...
1
vote
0answers
40 views

SHP, SHX and DBF files became empty (zero byte) overnight on QGIS

This literally happened overnight. I was working on a shapefile in QGIS 2.4 last night but my files (SHP, SHX and DBF) all become zero byte this morning. Has this happened to anyone before? How ...
0
votes
0answers
38 views

How to find a distance from a point to a polyline in QGIS?

Please show a sample Python code of finding a distance between a point to a polyline in QGIS. (without any plugin)
2
votes
0answers
15 views

QGIS isn't displaying dates in the attribute table

I have a QGIS project that links to data in a Postgres database. For some reason, QGIS is not displaying any data in date fields. The date fields appear to be fine in Postgres and I have performed ...
0
votes
1answer
41 views

How to add mdb geodatabase layer (feature class) to QGIS project using python?

I want to add a feature class of a personal geodatabase mdb to my qgs project by code (a plugin I am working on). I am using a command similar to that used for adding shapefiles, but this is not ...
3
votes
1answer
39 views

How to display multiple fields as labels if one field is null?

I am having some issues trying to show multiple fields for a single label in QGIS. In QGIS2.6, attempting to display labels for a feature consisting of multiple fields results in an empty label if one ...
1
vote
1answer
32 views

QGIS OpenStreetMap plugin: download failed. Server replied: bad request

I am trying to download Open Street Map data using the OpenStreetMap plugin in QGIS, and getting the following err: I'm kind of new on geoprocessing, so I have no clue what is going on here.
1
vote
1answer
23 views

How to allow the user to place a point as input for a geoprocessing model?

Is there an analogue to Esri's "Feature Set" in QGIS modeller. I am interested in creating a model that allows the user to place a point feature on a map as an input variable for a geoprocessing ...
0
votes
0answers
31 views

Why does repeatedly running the Difference Tool in QGIS stop working?

I'm having problems using the Difference tool in QGIS. When I progressively remove areas from a shapefile (a simple buffer) using the Difference tool, it seems to work fine until I get to the 5th to ...
0
votes
1answer
24 views

How to reference a return value from openProject macro?

It is very good to have available functions on startup.py, I created one to get the qgs project base name and referencing it as a Python expression on the composer thanks to all the information found ...
2
votes
1answer
46 views

How to start writing a QGIS Plugin?

I'm taking my first steps in writing a plugin for QGIS by following this tutorial: http://www.qgisworkshop.org/html/workshop/plugins_tutorial.html There is not even any functionality in this code, ...
1
vote
1answer
42 views

QGIS distance matrix in meter instead of decimal degrees

I'd be thankful for your help. i created a point layers of store locations and customers in Florida by given coordinates (WGS 84 EPSG: 4326). Now i need a distance matrix between stores and customers ...
1
vote
1answer
49 views

QGIS WFS-T not updating data

I have asked for help on this topic a few times, but i'll go one more time; with a bit more info. I am trying to edit a WFS from geoserver (using PostGIS data) within QGIS. This is the request as ...
0
votes
0answers
48 views

How to import a .sid Raster File in QGIS 2.6.0 On Linux Mint 17

I need some help importing MrSID Raster files in QGIS. I am running 2.6.0 on Linux Mint 17. After an internet search I have found a couple of resources that are perhaps outdated. The most promising is ...
0
votes
0answers
36 views

Is there an easier way to refresh a joined CSV?

I'm working with data that gets updated sporadically. Essentially, I have a CSV which defines which postal codes belong to certain sales reps, and these postal codes might shift around. I made ...
1
vote
1answer
42 views

QGIS polygon outline color lighter

How can I make it so that the gradient classifer (look closely, there are bits of red in some places) is more pronouced? Or that the outlines of the zip codes are less pronounced?
2
votes
0answers
26 views

Creating an automatic connection to Microsoft SQL database instance in QGIS

I have connected to an MS SQL database in QGIS using the Add MS SQL table(s) tool. However I have a lot of feature in my database and so it is inconvenient to reconnect to the database every time I ...
0
votes
1answer
25 views

Saving text labels out of qgis

I have imported an OS mastermap text shapefile into qgis 2.2.0 (desktop). It only shows as points information, no text. I have edited labels so that they show (e.g. road names). The problem that I ...
6
votes
1answer
133 views

How to remove Commas from field values in multiple files?

I'm working in QGIS, presenting data in ArcMap, and Arc is having trouble with the attribute tables. I have a "species" column which lists the species found in that area and have added commas "," in ...
1
vote
0answers
30 views

QGIS field calculator expression: selecting min/max values within field groups

I am new to using QGIS (previously used Arc) and trying to get my head round the expressions and Python. I have series of polylines representing routes and require the linear distance from the ...
1
vote
1answer
43 views

How to calculate distances in QGIS field calculator?

So I'm using qgis 2.6.0 and I have a csv (converted into a .shp) with two geometry columns, I want to create a new column with the distance between the two geometry: shot.lat shot.lon haul.lat ...
1
vote
0answers
33 views

Versioning In QGIS

Are we planning to have in QGIS implementation 1 Versioning like ESRI. How that can implemented? There is a general need for the the implementation where QGIS is used for planning and planned design ...
2
votes
1answer
57 views

How to export lines from ArcGIS to be used in QGIS

After a big bunch of bureaucracy we have been giving green light to request government geodata. The requested data includes mostly seperate landplots, roads and rivers. We originally were told we'd ...
1
vote
1answer
84 views

Generate territory polygon from sets of points

I'm looking for a simple way to generate contiguous "territories" from sets of points. Say, points A, B and C are in territory 1, and D, E and F are in territory 2, then generate polygons that lie ...
2
votes
1answer
42 views

How do I select a point imported from a GPX file?

I imported several GPX files and added a raster basemap for reference. The GPX files contains tracks so the points are sequentially numbered. I'd like to identify one of the points so I edit the GPX ...
1
vote
0answers
19 views

How to find QGIS or QT or Python object definitions

I am attempting a simple plugin, on QGIS 2.6, using the available QT Designer installed I have successfully loaded a plugin, and can display a dialog box with widgets, within, and now attacking ...
1
vote
0answers
48 views

Permission denied when clipping raster

Trying to use raster extraction clipper to prepare a selected area of the map for generating contours - keep getting the error message: ERROR 1: TIFFOpen:everest_gmted30.tif: Permission denied ...
2
votes
1answer
56 views

Is it possible to render a large number of shapefiles to a pdf document using Python?

I'm extremely new to GIS, and recently made a map by loading a bunch of shapefiles into QGIS using a python script. However, it took 15 mins to scroll in or out on the image, and the pdf export ...
0
votes
0answers
42 views

QGIS vector edition corrupts SpatiaLite attribute table

I have a problem with edit SpatiaLite Layer on QGIS. When I make a this set of editions: cut line, delete a part, insert a new line and save it, the attribute table is corrupted. I was thought that ...
1
vote
0answers
20 views

QGIS Processing Toolbox: otb provider XML

Good day, I am trying to integrate an OTB application into the processing toolbox. MANUALLY created a XML file for it but get : Could not open OTB algorithm: ...
2
votes
1answer
61 views

Fuzzy maps with QGIS/GRASSGIS

How to do fuzzy maps (FUZZY module in IDRISI) with QGIS/GRASSGIS?
4
votes
1answer
70 views

Unable to see map in QGIS?

I am new to QGIS but used to ArcGIS. I am working my way through the tutorial and have downloaded a map from earth explorer - following all the instructions. The map is in the left hand panel and ...
3
votes
0answers
86 views

Is there any reason not to upgrade to Windows 8.1?

I have the option to upgrade to 8.1, but before I do I want to see if anyone has had any compatibility issues. I mainly run ESRI, but occasionally use QGIS, and other open source products. Has anyone ...
2
votes
0answers
42 views

How do I show the file path on a map?

Can anyone tell me how to show the file path of a map when I'm composing my final map figure. Kinda of like in excel in the headers and footers options where you can show the file path of the excel ...
1
vote
0answers
59 views

QGIS Crashes with OpenLayers plugin

I've just updated to QGIS Brighton on Ubuntu 14.04, and I've noticed that when I open Openlayers plugin, in order to load google layers, the whole program suddenly crashes. The only log I see, when ...
2
votes
0answers
58 views

Calculate area in square meters from degrees?

I have a polygon shape file in geographic coordinate system, i would like to calculate area in square meters in QGIS using python. Is there any formula or equation to do this? Thanks
4
votes
0answers
109 views

ESRI Personal Geodatabases in QGIS 2.6

I am having an issue loading any ESRI personal geodatabase in QGIS 2.6. I have a number of files that worked in QGIS 2.4 and having done the upgrade I can't open them in 2.6. I have tried this with ...
0
votes
0answers
14 views

Add ids to the merged features using python programming

I have written the python code that merge the features based on the area.But after merging the features it is not assigning ids to the merged feature.Can anyone tell me how to assign ids to the merged ...
4
votes
3answers
63 views

QGIS Composer thematic map : one (png, pdf, etc.) map per feature type

I've got a shapefile that contains thousands of features that can be group by categories. These features are sometime located in the same place so they overlap. An example of the content of my ...
2
votes
1answer
47 views

Convert Layer to Shapefile without losing Feature definitions

I have created a worldmap with custom defined Features, representing State/Zip-Code sales areas. I want to convert them into a Shapefile, so I can convert the Shapefile into a polygon definition file ...
0
votes
1answer
40 views

How do I measure the area difference between polygons in different shp files?

I have couple if shp files with 1000 polygons scattered in them (around 1k in each file) , each shp file represents a time frame (3 months period) and I want to show the a report with a progress of ...
1
vote
1answer
28 views

With QGIS Plugin Builder, receiving “ImportError: cannot import name”

While doing a first-time attempt to craft a simple plugin, I ran into the above error. I am using QGIS 2.6.0 for windows, the QT Designer that comes with that package, and the plugin builder plugin ...
2
votes
1answer
47 views

How to Export to DXF and retain elevations of contours using QGIS?

I have shape files for a whole county, and have created a base map in Qgis. What I do for my projects is zoom into the area of interest then export to dxf. The same procedure was used when I used ...
1
vote
0answers
21 views

How to fill empty pixel from DEM using QGIS?

Is it possible to fill empty pixel from DEM (hgt file)?) in QGIS ? When I load it, and zoom to a big scale, some pixel without any value appear. ( I have found a way using another software 3DEM on ...
4
votes
2answers
104 views

How to draw points around a circle in QGIS?

I've got a square origin-destination matrix with 23 elements, I would like to draw each one of these elements as a point around a circle, to achieve a result like the following: Can you suggest me a ...