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

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1answer
33 views

Automatize adjust polygon bounds based on other polygon

I have two polygons, as below: Does exist an automatic way to adjust the vertices of Pink Polygon near of Blue Polygon bounds to Blue Polygon bounds?
3
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2answers
303 views

Asking QGIS to provide upgrade for particular distro?

I effortlessly installed QGIS 2.4 and upgraded to 2.6, for my Linux Mint 16, because I just had to put http://qgis.org/debian in my repositories list and note that my distro was saucy. 2.8 has been ...
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2answers
330 views

US map shape distorted in QGIS

I am very new to QGIS and mapping. I am trying to load a US state map shapefile in QGIS. But the problem is it does not look like another US state map available on the internet. The upper part looks ...
1
vote
1answer
525 views

QGIS SAGA Raster Calculator [closed]

I am using SAGA --> Grid Calculus --> Raster Calculator on QGIS version 2.6. The formula I am using is: ifelse(gt(a,0), (a), b) where a is my layer with values in a greater extent than that of b. ...
2
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0answers
148 views

Microsoft Visual C ++ Crash when Install qgis.2.8.1

I have installed and reinstall QGIS ver.2.8.1. and always display a message as shown below. I hope someone can help me fix these problems. Thanks for your help.
1
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1answer
144 views

Problems opening ASC files in QGIS

I am trying to open an .asc file (pick, for example, that one for 2014) from the German Federal Ministry of Transport and Digital Infrastructure. It contains information on the annual solar radiation. ...
0
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1answer
211 views

Publishing map service with QGIS [duplicate]

I am new to QGIS, and I am from Esri ArcGIS background I would like to know how to create a server on my machine that I can use to publish map services for online use. I just downloaded QGIS 2.8 from ...
1
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1answer
366 views

how can I make “weighted sum overlay analysis” in QGIS? Ordered Weighted Averaging manual may be useful

I have weighted raster data converted from polygons with different categories. I have ArcGIS with 3D Analyst extension, unfortunately do not have Spatial Analyst, and I would like to use QGIS to make ...
2
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1answer
478 views

QGIS 2.8.1 ogr OpenFileGDB zip format

I am experimenting with the OGR OpenFileGDB zip file format in QGIS 2.8.1 on Windows 8.1 x64 and although OGR says it can happily read the format (with a couple of Code Page warnings) I am unable to ...
4
votes
1answer
63 views

Saving a calibrated route in QGIS for “future” use

Can a Calibrated Vector (after using LRS) be saved with M values, so that the file does not have to be calibrated every time is used? We're currently working on State road data, and it has many ...
1
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0answers
27 views

Update a WMS Connection list automatically

I'm working on QGIS 2.8 Is it possible to automatically update an XML document containing a list of WMS connection and if that file can automatically follow my QGIS project file For example, if I ...
1
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0answers
63 views

How to loop through the raster layers and create a PNG for each?

In QGIS 2.8.1 I have a number of raster layers covering the same extent, but for each year 1975-2014 (times three categories). I am creating one print composer for the extent, but I need to print ...
2
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0answers
151 views

Importing 3D models/wireframes into QGIS

I was wondering if Qgis2threejs is able to import 3D models (wireframes in 3D dxf) from GoCad, Datamine or any other 3D modelling software? If not, is there any other plugins for QGIS that would be ...
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0answers
21 views

PDF Print in QGIS 2.8 using OSM layer comes out with very small labels [duplicate]

I am working on QGIS 2.8 using the OSM plugin. I've prepared a map with a layer I drew and the OSM layer behind it. In design view it looks great, with good label size, but when I print it to PDF the ...
2
votes
2answers
359 views

Is it possible to sort the features by an attribute programmatically?

I have written a PyQGIS script that loops through an attribute table and finds duplicated values in a target attribute field. My technique requires that the attribute table is first sorted by the ...
1
vote
1answer
228 views

Geocoding using OSM data

I'm working on a geocoding project using the plugin in MMQGIS QGis, and I want to use OpenStreetMap data in this project. I have already downloaded the data of my country and I converted to .CSV ...
1
vote
1answer
120 views

QGIS - Intersect Spatial GRID and Polygons - Return whole cells on the boundary

I've been managing within QGIS two shapefiles: the first is a spatial square grid, and the second a city region. Now I would like to intersect the grid keeping only the cells that are overlapping the ...
1
vote
1answer
470 views

QGIS Server not working on Windows 7

I have installed QGIS Server through OSGEO4W. I followed the instructions by Anita Graser, as well as the instructions on this page but still keep getting a 500 Internal Server Error. The objective ...
3
votes
1answer
340 views

How to reproject all the vector files in a folder to a particular projection using ogr2ogr?

We have a folder with all sorts of vector files like tab,shp,dxf. Many of the files are in different projection. I would like to convert all the files to EPSG: 4326 and eventually the non-shapefiles ...
0
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0answers
107 views

Copy features from shape layer and paste them in postgresql layer

I have the features in my shape files and i want to save them on my cartaro website. My problem is when i paste the features ine my database layer ot works correctly but i havent the atributes of the ...
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0answers
213 views

Spatial analysis using QGIS or ArcGIS for Desktop?

I am working on the spatial distribution of commercial parking public spaces. I made a database (NUMBER PARKING PLACES, NUMBER OF PARKING MONTHLY), business subjects with adresses with activity. I did ...
1
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1answer
217 views

G_realloc: unable to allocate 46320000 bytes of memory while managing large .xyz through v.in.ascii

I tried to convert large (~180MB) .xyz file into vector through v.in.ascii in QGIS Brighton (2.6.0) Grass plugin (it should be Grass version 6.4.3). The "primitive registration" stage lasted very long ...
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2answers
144 views

How can I generate batch of coordinates from linestring to simulate driving on map?

I have a openlayers map and I want to simulate driving a route on it. I would like to draw a line (using GPX tool) and create gps coordinates (preferred with advancing time stamp) so I can query them ...
2
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2answers
261 views

How calculate pixel by pixel the mode (statistic) of multiple rasters (geotiff)?

I have 12 land cover maps, and I would like to calculate the mode to each pixel of the 12 maps (they have the same resolution and dimension). I mean, the final map would be the mode for each pixel of ...
3
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1answer
177 views

How to order points along a line?

I have a bus line with bus stops along the route. The sample data looks like this: LINESTRING (-70.57243474999999933 -33.37452829000000065, -70.57308152999999606 -33.37470645999999874, ...
2
votes
1answer
120 views

How to access a specific feature?

Is it possible to go to a specified row number (or perhaps the next/previous) row using PyQGIS? This code gets the value of the first attribute in the first row of the table features = ...
2
votes
1answer
43 views

How do I count the number of cells which can see each cell in QGIS

For each cell in a DEM I'd like to count the number of cells which can see it (i.e. direct line of sight) - Can anyone explain how to do this in QGIS? Thanks,
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votes
2answers
348 views

Add a serial id column inside a view

Is it possible to create a new id serial column inside a view? I need it to be able to add my view in postgis I have made a full outer join on two tables I need a unique PK to load the view in ...
1
vote
1answer
77 views

Initalize plugin with current working directory?

Upon starting Qgis, a (currently under construction) plugin needs a means of checking the current project/legend/registry. This checksum would ideally occur upon startup automatically. As the plugin ...
2
votes
1answer
148 views

Error with adding map layer to QGIS?

I am working on a project on QGIS were a i have 50 geographical point i would like to put in map. The reference system is the UTM Zone 36S. I have successfully imported the coordinates but after i ...
2
votes
2answers
346 views

Batch add column to layers and add layer prefix in PyQGIS

I have a number of layers each with a prefix like A_ B_ and so forth. I'd like to: Add a column (text) called DENSITY to each shp Add the prefix letter from the layer name to each row in the ...
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0answers
51 views

Can I use custom icon in QGIS?

Some custom icons created in AutoCAD maps turns into dots on QGIS. Can I use a custom icon On the QGIS or a custom icon in AutoCAD can be displayed correctly on QGIS?
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0answers
49 views

Systematic inaccuracy in QGIS shape area

I’m trying to find out why I get different area figure in QGIS than in AutoCAD when I’m using the same shape file? What I did is I drew a shape in AutoCAD, imported it in QGIS and used the field ...
4
votes
1answer
793 views

Unsupervised classification in QGIS

I was trying to learn unsupervised classification in QGIS 2.6 following the tutorial video: https://www.youtube.com/watch?v=mI80eENtWSE When trying myself, clicked Run during the process it shows the ...
4
votes
0answers
290 views

Add vector tile sources to QGIS

Is it possible to add vector tile sources (using MapBox's protocol buffers format, or GeoJSON, or otherwise) to QGIS? If so, how? (My question is a bit similar to Can the new Mapbox Vector Tiles be ...
1
vote
1answer
238 views

How can I allocate a $rownum in reverse order in QGIS?

How can I allocate the $rownum value in reverse order in QGIS? I have a created a grid layer to use in an atlas and the ID allocated is from top left to bottom right - which is what I want if I want ...
3
votes
2answers
442 views

Different definition of EPSG:3857 in GeoTools and QGIS

I want to do some checking if my point lies in any of the polygons defined in shapefile. So, I thought that I will determine CRS from shapefile (created in QGIS), and use it for transformation (where ...
2
votes
1answer
203 views

QGIS 2.8 topological editing creating vertices

When using the node tool with topological editing enabled on a group of multiple lines, double clicking sometimes doesn't create new vertices. Instead, the line segment gets selected. When this ...
3
votes
2answers
148 views

Loading Grass 7.0 vectors in QGIS broken?

Running QGis 2.8.1 in Win7 (64bits), installed through OSGEO4W. When trying to load a Grass 7.0 vector file in QGis, the program will simply crash without any notice. I can load old Grass vectors ...
2
votes
1answer
194 views

New filter expression QGIS 2.8

I try the new filter expression with QGIS 2.8. I want to filter only the selected objects on a layer in my map. My expression is: import processing from qgis.core import * vlayer = ...
1
vote
2answers
525 views

“ImportError: no module named qgis.core” in standalone app

I am developing a standalone app (in Windows) using libraries from QGIS. When I run the script in cmd, I get the ImportError: no module named qgis.core. I read in several posts that I need to ...
2
votes
1answer
311 views

Go through items in a composer legend (QGIS 2.6)

I'm trying to develop a plugin in QGIS 2.6, which opens a composer, add a map and a legend, and (among other things) adjusts the legend. Is there a way to go through items in a composer legend with ...
1
vote
1answer
67 views

How to georeference two pictures that do not have crs in QGIS

I would like to take aerial pictures of my research plots an caculate NDVI and NDWI. How do I do that in QGIS?
1
vote
2answers
356 views

qgis: how to use 'max()' in an expression

I wanna make a rule-based style on the maximum value from a field. I set my expression like: max("fieldname") It returns every value instead of only the maximum one. Can anyone tell me the richt ...
1
vote
0answers
78 views

QGIS actions - get currently selected attribute column (with python?)

I'm trying to open files dynamically through actions. A simple example would be: Action name: OpenLink from PyQt4.QtCore import QUrl; from PyQt4.QtWebKit import QWebView; myWV = QWebView (None); ...
2
votes
1answer
526 views

How to select lines/polygons in QGIS CAD tool?

I'm intending to create parallel and orthogonal lines by using the CAD tool in QGIS. For each tool there is a button to select the feature before executing the tool. But though I fixed all the ...
0
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2answers
212 views

Does QGIS data work in Esri CityEngine?

Does QGIS data work in Esri CityEngine? I have a copy of CityEngine Basic and imported a shape file which have the street network and lots. Without ArcGIS I can't open data which have building ...
1
vote
1answer
79 views

Is there any topology handler in QGIS?

When importing autocad maps, sometimes topology will be chaos, this need to be amended. And when I add new topology in QGIS, how to save that to the postgreSQL? Is these functions included in QGIS or ...
2
votes
0answers
48 views

Is it possible to have a locked/different first page with QGIS Atlas printing?

It is possible set the first page of a QGIS Atlas different to the other pages? For example I want to create an Atlas document where the first page has a text introduction and a general map (not ...
3
votes
0answers
83 views

Is there any way to aggregate points within a certain distance of eachother into groups of X?

I know it's possible to aggregate points within a certain distance of eachother, but is it also possible to aggregate them into groups of e.g. 20? I'm fine with using most open source GIS software or ...