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

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3
votes
1answer
89 views

When creating an expression in QGIS, is there a way to reference the next record and previous record?

I have a set of points from a GPX file, and would like to create a heatmap from them, with the points weighted on the amount of time spent at that point. I want to create a calculated field in QGIS, ...
2
votes
2answers
117 views

Problems installing QGIS on Windows Vista

I have tried several times on several windows vista machines to install QGIS (both versions 2.10.1 and 2.8) but with no luck. It seems to install fine without any errors but when the installation is ...
3
votes
1answer
480 views

cannot convert shapefile into GeoJSON

I have downloaded a shapefile of Stockholm (files on GitHub). I'm trying to convert the shapefiles to GeoJSON with the ogr2ogr command line tool. It does not work with the following error: Export ...
1
vote
1answer
102 views

Can I get rid of the borders around the colour boxes in QGIS Print Composer Legends?

If you look closely at a legend in the QGIS Print Composer, you'll see that each colour box has a hairline (1 px) border. How can I remove these borders? By playing around with the settings, I've ...
1
vote
0answers
20 views

Expression geomnearest not found

I have been making some new printer composers in a project I am working on in QGIS. I had implemented the use of expressions to create content for the title block, one of these is the geomnearest ...
1
vote
1answer
373 views

Delete (don't hide) text annotations in QGIS

I feel like this question should have a really simple answer, but I can't find it anywhere. I added an annotation to my map while experimenting with different buttons, and it wasn't at all what I ...
2
votes
1answer
259 views

Move feature in front

Is it possible to move feature in front of another? If I have smaller polygon and I draw larger polygon over it, is there a way how to move the smaller one in front? Is it possible in QGIS or better ...
2
votes
1answer
153 views

How to update a postgres/postgis table periodically with multiple data?

I have created a postgis table from point.shp with 5 fields containing 20 records. Now I want to populate the table with another 150 records keeping the previous 20 records so that the total records ...
1
vote
1answer
97 views

QGIS delimited text import CRS not being defined

I've recently updated to both the long term release and 2.10 versions of QGIS and the delimited text plugin has stopped working. Everytime I try to add a CSV file and say ok on the plugin it no ...
2
votes
1answer
82 views

Exporting only certain fields from a PostGIS table using QGIS Python

I'm trying to export tables from a PostGIS database into MapInfo TAB files, but only certain rows and columns. I have my rows exporting right, using a query, but I'm stuck on just getting the columns ...
1
vote
1answer
42 views

No export dialog on QGIS 2.8 and 2.10 with Mac OS X Yosemite?

I'm trying to work out the map making tutorial here: http://www.qgistutorials.com/en/docs/making_a_map.html When I try to export an image or pdf or even print the map I built in the composer, I ...
1
vote
1answer
54 views

2.10 program group option to open QGIS with GRASS

I have installed QGIS 2.10 on Windows 8. I cannot find the 'option' to start QGIS with GRASS - as has been previously answered. Have I possibly missed something in the install? Is this 'missing' ...
3
votes
1answer
65 views

Display or export gdal_translate exponential scaling equation

I have an GeoTiff raster that contains elevation information at each pixel. As OpenLayers 2 can't display GeoTiff, I convert it to a PNG image and have to apply an exponential scale so the resulting ...
2
votes
1answer
58 views

Plotting points on a map based on address text string of location

This may be a naive question, but I'll try anyway. I am working in QGIS, and I have a shape file with more than 2000 rows containing information about specific trees in a botanical garden; their ...
1
vote
0answers
15 views

Project do not open anymore because of a minidump [duplicate]

I have closed my project two days ago and this message appeared : minidump déposé dans C:\Users\wwf-adm\AppData\Local\Temp\qgis-20150903-171144-3780-1392-8fdd08a.dmp When I try to open my project, I ...
1
vote
1answer
90 views

Problem creating polygon in a layer

I am working in c++ qt4.8.5 and api qgis 2.8.2 c++. In my application I had to put polygon to define attractive zone. I found a great post in stackexchange (86812). I have based my on this post and on ...
3
votes
1answer
278 views

How to fix QGIS Plugins crashing with “NameError: name 'pyplugin_installer' is not defined”?

I recently switched to Windows 10 and therefor did a clean Windows and QGIS 2.10.1 Install. QGIS worked fine, I reinstalled all Plugins, that I used to have. No Problems. Today I switched on the PC ...
3
votes
1answer
147 views

Tilted projection in QGIS

I'm trying to add tpers projection as a custom projection in QGIS 2.10.1 In the Custom crs dialog I'm adding the proj.4 text: +proj=tpers +h=500000000 +lat_0=19 +lon_0=99 +x_0=0 +y_0=0 +a=6371000 +b=...
1
vote
0answers
38 views

How to best populate points within a polygon with a set of rules

I've got a polygon (a Circle) with a certain size. I want to put points inside it, as much as I can, but with a set of rules : Points can't be near each other, up to 500 meters. Points can't be near ...
1
vote
2answers
76 views

QGIS Processing Plugin Not Loading “RuntimeError: maximum recursion depth exceeded in cmp”

I am having serious issues with my QGIS program regarding the Processing Plugin. Upon start-up and if I turn on the plugin within the program. I have uninstalled and reinstalled the program. Have ...
1
vote
1answer
304 views

QGIS Generating a Lat/Long Degree Grid in Composer

I made a map in WGS84, which is positioned and referenced correctly. Now I loaded the map into the Composer and added a grid, with horizontal and vertical lines each 500 world units (m). When I ...
6
votes
2answers
365 views

How can I average point features spatially in QGIS?

I have a GPX file with track points and I want to average the points spatially to improve accuracy of the point feature. I can't just make a polygon and find its centroid as the number of overlapping ...
1
vote
1answer
58 views

How to create a specific svg file with data from a feature

I am working in c++/ QT4.8.5, with qgis api c++ 2.8.2 I have to display a dynamic icon for a feature. some of the data change periodically and in order to display the change i need a svg that can get ...
3
votes
1answer
110 views

QgsExpression using complex sql and python subsitution

I have a sql statement i am running in postgres fine and would like to transfer it to a QgsExpression mainly because I have loaded the layer in Qgis. My sql is: select column a,column b from table1 ...
0
votes
0answers
12 views

Tracing a raster layer in QGIS [duplicate]

I have a basic map I would like to trace into vector form in QGIS. The map is just a JPEG and has no coordinate reference data. Whenever I import it into QGIS, it ends up as a tiny speck at 0,0. How ...
0
votes
1answer
131 views

Qgis 2.10 unable to add a new feature in spatialite via sql function “GeomFromText”

Using Python code in my plugin the function in sql language "GeomFromText(POINT(X Y))" gives the following error: "OperationalError: no such function: GeomFromText" Plugin functions in previous ...
1
vote
2answers
99 views

Syntax error in parameter formula of field calculator funtion

I'm using a QGIS 2.8.1 in windows. Have some doubts with syntax when use string in python console. I want to use the field calculator funtion like: processing.runalg('qgis:fieldcalculator', input, ...
0
votes
1answer
63 views

messed up shapefile attribute table text

I have a .shp file from AutoCad imported to QGIS (using _MAPEXPORT > text in AutoCad) and this is what happens to text in attribute table - example: {\Fsimplex|c0;O\Fsimplex|c238;Š\Fsimplex|c0; Dom\...
4
votes
1answer
324 views

Exporting Contours from QGIS into AutoCAD [duplicate]

I'm trying to export contour lines from QGIS into standard AutoCAD but I'm not having much luck. It does not seem to matter what type of file I select as the output during the contour creating (eg. ...
2
votes
1answer
62 views

How to reduce points by proximity

I got a layer with over 4 million points. The distance between the points are 1 meter. How can i reduce the data so that no points have less than e.g. 10 meters between them?
1
vote
0answers
75 views

Polygons within Polygons Spatial Analysis

I have a polygon layer of planning applications and I am wondering if anyone can give any advice and or has seen or written a blog post that might point me in the direction of creating relationships ...
1
vote
0answers
75 views

About performance of qgis with big layer or a lot of layer

does anyone has a feedback on the performance of a big layer by exemple : I have a layer with 100 features, each feature contains specifics attributes with dynamic data, the data change each second ...
1
vote
0answers
41 views

GeoExplorer not display the associated table to a layer

GeoExplorer shows the table information associated with a layer of 2 ways: Information button: clicking on the map is displayed a tab corresponding to the polygon attributes where you click. Query ...
1
vote
1answer
990 views

SVG To Shapefile [duplicate]

Is it possible to draw out some SVG shapes in Illustrator or Inkscape and convert them to Shapefile using GDAL or QGIS (or something else perhaps?). I have an image that I can easily georeference, ...
1
vote
1answer
45 views

Calculating field on insert (real time) using QGIS?

We use QGIS as a field application. We like to calculate with a input value and then also calculate with the result of the calculation Example: Liters: 1000 -> Liter per container: "this has to be ...
0
votes
0answers
24 views

How to add coordinates to an image in QGIS? [duplicate]

I use QGIS 2.10. I have a map image without any coordinate or boundary info. I need to convert it to kml file and before this, I need to add specific coordinate info for this map. How can I add ...
2
votes
2answers
185 views

How to visualize updating lines of bearing from a point

I'm working on a project where I need to visualize a constantly updating line of bearing from a point, based on degree of rotation around that point. My plan is to design a line feature with an ...
2
votes
2answers
84 views

How can I use a DBF layer in an R script in QGIS?

How can I use a DBF layer in an R script in QGIS? For example, I can input a vector by using ##Layer=vector, and a CSV table with ##Table=table, but it will fail if the table is based on a DBF file. ...
0
votes
1answer
66 views

Paths with least elevation gain

I have a DEM of a city with numerous hills and a shapefile of the city streets. I want to find the five paths from a low point A to a high point B on the street network that involve the least ...
1
vote
0answers
124 views

32Bit QGIS 2.10 Problems with Gdal WMS TMS google maps layer

I have been using gdal wms layers to view various basemaps in QGIS. I am using this technique rather than open layers because this I can reproject gdal WMS layers as needed. When I get close to the ...
0
votes
1answer
54 views

How can i calculate the distance to the nearest five neighbors for a polygon layer?

Data set (shape file) contains polygons. How can I calculate the distance to the nearest 5 polygons in the data set in QGIS?
2
votes
3answers
224 views

How to host QGIS threejs outputs?

Is there a free simple way to serve / host the .html files the awesome Qgis2threejs plug-in produces? I have tried using Google Drive as shown here and here without success. Also had same results ...
4
votes
1answer
454 views

Showing only some layers in QGIS legend?

My QGIS 2.8.2 standalone app provides several decorating layers (e.g. cartographic grid, background layers, reference points) which should be not changed by the user (neither editing nor hiding), as ...
1
vote
0answers
27 views

Zonal statistics shifted

I am working with QGIS (newbie). I have a raster map with 0.5degrees resolution. I created a 0.5degrees width grid layer and I compute zonal statistics from the raster. My problem is that it seems to ...
4
votes
1answer
152 views

Explaining gap between Robinson WGS84 (EPSG 54030) in QGIS and ArcMap?

Does anybody know why there a gap appearing between two point layers create with ESRI and QGIS when I a reproject, from the same source file, to Robinson ? The source coordinate system and ...
2
votes
2answers
233 views

Deciding variables for unsupervised image classification?

The results of an unsupervised image classification may vary A LOT depending on the variables you use from the beginning. These are the variables for the tool in ArcGIS:number of classes, minimum ...
1
vote
2answers
123 views

is it possible programmatically to rotate a svg of the feature without rotate all feature

I am working on a project that need to move and update the shape of the feature of the layer. I am working in c++/ QT4.8.5 and qgis api c++ 2.8.2. In my Layer I have a lot of features, each feature ...
2
votes
1answer
42 views

Recast data from one geographic standard to another

I'm working right now a project looking at medical labour supply in rural areas in Australia. I aim to use STATA for most of this analysis, but a change in geographic standards by the Australian ...
2
votes
0answers
76 views

QGIS Set Composer Legend to shrink the font size to fit

QGIS 2.10.1. I have read that it is "impossible to make the legend smaller then its contents". Is there a way to set the legend to shrink the font size when re-sizing the bounding box? Or when you ...
3
votes
1answer
113 views

What projection to use to get a game map into QGIS?

I have built and maintain a SWTOR game map atlas. At the moment, it's all static jpg maps, but I would like to get the info into an actual GIS software to get more functionality and make my website ...