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
38 views

How to import the “QGis” class in a script?

I want to check which type of geometry the current layer has. Therefore I use the PyQGIS documentation on Access to Geometry and my code looks like: if iface.mapCanvas().currentLayer().wkbType() == ...
2
votes
1answer
28 views

QGIS 2.8 Labels are lost when setting map rotation with crs on the fly

I was working with QGIS 2.8.1. When I set the map rotation in canvas the canvas rotated as wished but all the labels were lost. I found out if I disable CRS OTF(on the fly) all the labels will be ...
3
votes
1answer
64 views

QGIS 2.6 summarizing area (m²) for current atributes

If I have a code for each polygon and I have counted the area in m² for each of them (all this information is in single columns). How can I summarize these areas by codes (for example summarize all ...
1
vote
0answers
26 views

QGIS Atlas generation - Export atlas as images - only JPEG, want PNG

I can't find an option to choose image format while exporting Atlas, choices are Export atlas as images / as SVG / as PDF The dialog that opens has no options and it always exports as not so good ...
1
vote
0answers
18 views

Incorrect Acreage QGIS 2.6.0

I have six polygons, all of (fairly) similar size. The first one is 8 acres, the others are obviously wrong with 120,000 acres, and 106,000 acres and so on. I am calculating with the field calculator, ...
2
votes
1answer
90 views

Polygon centroid coordinates update error

After a week of unsuccessful fighting I'm forced to ask for your help. I have created a table 't_excavations' with fields 'id_excavation', 'geom' (MULTIPOLYGONE), 'longitude', 'latitude' CREATE ...
1
vote
0answers
36 views

heatmap dislocated when generated [duplicate]

QGIS 2.8.1 Does anyone have the answer to why a generated heatmap appears without coordinates and therefore is not on top of the vectorlayer that it was generated from? I checked the CRS setting but ...
0
votes
1answer
19 views

Problem moving layers in QGIS

Just wondering if anyone ever experiences any problems moving layers? I have set up QGIS in the office and it works brilliantly for everyone apart from one of my colleagues who finds that on odd ...
0
votes
0answers
9 views

GRASS_INFO_ERROR(16605,1) while running a GRASS tool

I have a fresh install of QGIS 2.8.1 with the GRASS plugin on Ubuntu 14.04. I opened the mapset I've created in QGIS 2.6.1 on Windows 7. Then I tried to run v.in.ascii Grass tool and I got following ...
2
votes
1answer
24 views

Polygon shapefile field calculator problem

My project is set in WGS84 only, and I have checked 'enable on the fly'. I have created a polygon shapefile and my problem is that when i use field calculator in the attribute table on my polygon ...
1
vote
0answers
24 views

Update shapefile name with layer name

I had a layer that I split by fields. The resulting files were given a name. I updated the names of the resulting layers in QGIS but have realized that the shapefiles have not been updated ...
1
vote
0answers
11 views

Configuring Identify Feature Tool in Geomoose

Currently,i am workiong on geomoose.And i Faced a problem with the identify tool.Plotted some point data in geomoose and the identify tool displays more than one result for a single point.Is this ...
0
votes
0answers
19 views

Overlay polygons on raster in different projections

I'm overlaying polygons on a raster to get the average value inside the polygon (using SAGA->Shapes-Grid->Add grid values to shapes in the QGIS Processing Toolbox), using a geographic and a ...
1
vote
1answer
30 views

Connecting polygon accidentally deleted - filling in the gap

New QGIS user, Brighton 2.6. I accidentally deleted an elongated (lots of "peninsulas" polygon that represents a stream-based habitat - two gaps on SW boundary and two on the northern boundary ...
2
votes
1answer
51 views

Euclidean direction

i'm trying to calculate the euclidean direction, in ArcGIS its very easy using the Euclidean Direction tool of Spatial Analyst but in QGIS i don't find how to do it. Any tips for this in free ...
0
votes
1answer
107 views

QGIS: How to add a second polygon that is exactly 5km larger in all directions?

Given is a map with an airport. Within a distance of 5km around the runway there is a so called no fly zone for drones (in Switzerland). I want to show this zone in a map. What I would like to do is ...
0
votes
0answers
36 views

QGIS shape file crop

I have a big shape file with greece roads network and i want to extract from it only one part of an island of Greece and make an new shape file with only the attributes of the island.
1
vote
0answers
27 views

QGIS Desktop 2.9.0 - ZoomOut doesn't work [closed]

In the QGIS Desktop 2.9.0-Master the Tool "zoomOut" doesn't work. The "zoomOut" have the same operation of the "zoomIn". This is a bug? I don't know where I report this bug, because I know the 2.9.0 ...
1
vote
0answers
24 views

Which VS projects are needed for a custom QGIS build?

Environment: VS 2010 Win 7 QT 4.8.6 QGIS git Src OSgeoW4 I have built the source for QGIS, in order to use it as a base for a custom application. I wanted to know what projects are 100% ...
2
votes
0answers
38 views

QGIS distance from point to line along a specific bearing

I've got a vector layer with points (representing customer locations) and another vector layer with a line (representing the coast line). I want to calculate a "smart" distance to coast. Specifically, ...
0
votes
2answers
32 views

add attribute information from polyline to a point shapefile (QGIS or ArcGIS)

I was wondering if, and how, it is possible to add attribute information from a polyline to a point dataset. I have a network layer with information per street how many scooters went over this street. ...
1
vote
1answer
30 views

QGIS how to save loaded min/max values for raster layers?

I am working with many layers. Each time I open my saved project, I must reload the min/max (properties/style) values. Is there a way to turn off the default 2% cut?
0
votes
1answer
55 views

Heatmap is upside down

I have a point file saved as a shapefile, now I want to produce a heatmap of the values. However the heatmap is projected upside down. I suspect my y coordinates are inverted or negative but I do not ...
1
vote
1answer
53 views

Is there a way to save a spatial join as .sqlite?

I'm joining data from PostGIS and SpatiaLite databases in QGIS using the "Join attributes by location" (Vector -> Data management Tools) tool. However, this has a big limitation - I can only save the ...
1
vote
1answer
30 views

Trouble calculating attribute values in pyqgis [closed]

I recently posted another question about calculating unique IDs for features using python and qgis here Calculating unique ID value for a field in QGIS using python. I am trying to use the same ...
1
vote
1answer
30 views

How to erase polygon from another in QGIS

I want to erase the pink polygon from the blue polygon. I've tried clip, difference, and symmetrical difference. Clip produces an empty polygon. Difference produces just another blue polygon.
1
vote
1answer
83 views

Connecting Data to GIS

Issue 1: I have been working on the re-evaluation of a Late Woodland Palisaded Village in southwest VA. The site map as been digitized in CAD. The original grid has been followed. The excavators did ...
2
votes
1answer
54 views

How to suppress polygon boundaries shared by objects of same type in QGIS?

Given polygons - like landcover in OpenStreetMap or street areas in cadastre - how can one suppress those polygon boundaries which are shared by objects (features) of same type in QGIS (see figure ...
1
vote
0answers
17 views

Print boundaries of one layer over another [closed]

i am new to QGIS. I have a base map from google, openstreet map over which i want to show the boundaries of another layer. How can i do that? While trying to edit, is it possible that QGIS allows to ...
0
votes
1answer
23 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
votes
2answers
148 views

How to ask QGIS to provide upgrade for your distro?

Here I am at StackExchange because QGIS itself doesn't seem to have forums I can ask at. I effortlessly installed QGIS 2.4 and upgraded to 2.6, for my Linux Mint 16, because I just had to put ...
0
votes
2answers
57 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
53 views

QGIS SAGA Raster Calculator

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. ...
0
votes
0answers
17 views

How to analyse large datasets of street lines to regularly track changes and find mismatches

I am new to working with streets data and am currently looking for the most effective method to analyse the quality of street datasets that are regularly updated and changed. At the moment I am ...
1
vote
0answers
38 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
vote
1answer
29 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
votes
2answers
73 views

SnapToCurrentLayer in QGis2.8 with python programming

I have a polygon vector layer and I want to snap the vertex. def canvasMoveEvent(self,event):   x = event.pos().x()   y = event.pos().y()   startingPoint = QPoint(x,y) ...
0
votes
1answer
33 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
vote
1answer
23 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
votes
1answer
80 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 ...
2
votes
0answers
23 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
vote
0answers
14 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
vote
0answers
24 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 ...
1
vote
0answers
33 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 ...
0
votes
0answers
20 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
59 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 ...
0
votes
1answer
53 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
25 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
0answers
33 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 ...
1
vote
1answer
68 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 ...