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

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2
votes
1answer
32 views

PROJ.4 - General Parameters: +no_defs

within a QGIS-course I would like to tell a bit about the proj.4 parameters. However, I´m not sure about the "+no_defs" parameter. The proj.4 website (https://trac.osgeo.org/proj/wiki/GenParms) ...
3
votes
1answer
30 views

Incorrect placement of a MrSid file in QGIS

I have a map saved as MrSid file which when loaded in QGIS displays as a southern hemisphere location despite being in the UK. When looking at the .sdw file the northing is positive but in QGIS it ...
0
votes
0answers
15 views

Automatically creating index features for a strip map in QGIS

Is there a free/open source equivalent ArcGIS's Strip Map Index Features geoprocessing tool? I'd like to use QGIS's "Atlas" mapbook functionality, but creating the index layer manually would be ...
1
vote
0answers
26 views

Is there a way to change floating toolbar orientation?

Is there a way, within QGIS 2.*, to stop the interface from trying to snap in floating toolbars (as attached pic)? I want to maximise canvas space, but the interface keeps on wanting to grab my ...
1
vote
0answers
34 views

How to create dynamic maps based on updated attributes in SHP file

I am novice GIS'er. I can create maps and do basic transformation of the SHP file using QGIS. I also succesfully applied formatting based on attributes. I am able to add new attributes to SHP file in ...
1
vote
2answers
50 views

Is there an algorithm for transforming from CGCS2000 to WGS84?

Is there an algorithm that supports transforming from CGCS2000 coordinate to WGS84 coordinate? CGCS2000 is China Geodetic Coordinate System 2000. Any advice would be thankful!
0
votes
2answers
36 views

Reduce squarish effect on group of polygon

I am trying to represent the average speed of some ship in the north of Mediterranean sea. I am interested in aggregate the speed information by zone. The raw data I am working with are .shp with ...
0
votes
0answers
20 views

QGIS installation failed - requires matplotlib which has been installed by Anaconda

Is there any way to specify python environment variable to solve this? When I tried to install QGIS on my machine - mac OS 10.9 and Anaconda has installed numpy, scipy, and matplotlib, I got the error ...
-1
votes
0answers
72 views

Extract Aerial Imagery using QGIS

I need to create city-wide (Warsaw in this case) aerial based map, pretty detailed (clearly visible buildings and possibly 1-pixel-sized cars. So far the only way I found is: Using this method: ...
0
votes
0answers
35 views

How to create a map in Pulkovo 1942 with grid?

I have a problem with coordinates when I change projection. With WGS 84 it's fine, I have normal, geographic coordinates. But when I'm changing to Pulkovo 1942 (I need a map of Poland), coordinates ...
0
votes
2answers
13 views

Error with layer.pendingAllAttributesList

While coding to obtain individual layers' attributes (field) list, I am stymied by the code. I can identify a specific layer: MyLayer = QgsMapLayerRegistry.instance().mapLayersByName("TestPoint") ...
1
vote
1answer
15 views

How do I ensure polygons are properly displayed when using 'on the fly' CRS transformations in QGIS 2.6?

QuantumGIS 2.6.0 (Windows 7 64-bit) I have created a PostgreSQL POLYGON as WGS84 (CRS 4326). The polygon is a series of points around (but not actually on) the edge of the map. This is a rectangle ...
1
vote
2answers
57 views

QGIS Python Script - Routing along Waypoints [closed]

I used Anita Graser's script point_layer_to_route.py which worked like a charm until I updated to 2.6. With QGIS 2.6 I always get objects without any features. Can anybody tell me if he/she had the ...
1
vote
2answers
27 views

fit a wrap column in the print composer QGIS 2.4

i have an attribute table in the map composer, and the field i want to see is quite long...so i wrap it. but the field width is not fitting this new length. how can i do that. is qgis prepared to do ...
0
votes
1answer
33 views

Is there a QGIS plugin that can transform tabular data to graph?

I have a CSV file with water level measurments in a well, taken once a year for 40 years. Is there a way to show this data as a graph (x axis being the date and y axis the water level) in QGIS?
3
votes
1answer
37 views

How to insert some holes in a polygon?

I have a problem with QGIS digitizing advanced tool plugin. I have a landcover-like shapefile. I have to perform some corrections on it, and I have to cut or split some polygons. I want to insert some ...
0
votes
1answer
19 views

How do I use a filter on an uncached WFS layer in QGIS?

I am trying to create a filter to show only specific features based on an attribute query within a WFS using QGIS. This works fine when using the standard WFS loader and creating a filter (based on ...
0
votes
0answers
29 views

How can I avoid displacements in exportet JPGS from QGIS 2.2?

I observed a small but annoying problem for a long time now. I have to design maps/plans of survey areas for work including maps where a satellite image is printed under a vector-layer showing the ...
0
votes
1answer
44 views

Is it possible to have auto-updating area fields?

I'm using QGIS 2.4.0 and I've noticed some problems with the derived area and the $area field. Firstly, I have a polygon which is a filled ring, inside another polygon. The derived area, and therefore ...
0
votes
1answer
29 views

How to set attribute to selected field?

I am trying to create a temporary point layer in memory using the following python code. # create layer vl = QgsVectorLayer("Point", "temporary_points", "memory") pr = vl.dataProvider() # add fields ...
1
vote
0answers
46 views

With QGIS, why use QT Designer tools for creating Slots/Signals/ etc, if plugin coding can do it alone

I am curious why there is facility within QT Designer to create signals and slots as, to my surprise, I did not need to do this. All of the necessary coding was accomplished completely within the ...
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
70 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
59 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
96 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
36 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
40 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
38 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
30 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
22 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
45 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
46 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
24 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
131 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
27 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
56 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
83 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 ...