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

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Can't get QGIS plugin translations (i18n) to work!

It's hard to be specific, but I'm having problems setting up translation files for the plug-in I'm building. The plug-in works fine, but I also want to enable translation of the GUI. I've tried to ...
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1answer
23 views

Failed to create memory layers in QGIS application on Linux

I have written a python class which reads properties of map layers from an XML file and creates appropriate memory layers. I have developed and tested this code with QGIS 2.8.2 on a Windows 7 machine ...
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1answer
25 views

How to dynamically change images in map reports?

I need to make a report about several cadastral parcels which data are contained inside three different tables of a database. Report must contain: Cadastral data taken from the three tables A ...
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0answers
29 views

Toggle Editing Mode issue with QGIS 2.8 [closed]

Returning to QGIS after a long absence. Probably missing something basic, but I can't click on the Toggle Editing Mode (pen symbol) when I open an Attribute Table in QGIS 2.8. Any pointers?
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1answer
9 views

QGIS: why does simplesvg export plugin generate poor quality output?

I am exporting a QGIS project to SVG via the simplesvg plugin. However the output is of really poor quality: all coordinates appear to have snapped to a rather coarse grid (while original data, as ...
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1answer
46 views

nearest neighbor query in SpatiaLite

I am trying to find the nearest line to each point in a layer, and I have over 1 million points. I want to be able to associated the closest unique line ID with the point unique IDs. I have tried to ...
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0answers
18 views

How to write a test suite for QGIS standalone application

I have a rather simple QGIS standalone Python app (2.8.2, Windows 7/64), with some published methods to create different types of geometric primitives (rectangles, circles). class MyApp(QMainWindow, ...
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1answer
29 views

How to render the Sea depth level in different color?

I would Like to adapt an old code in c++ using the api qgis 1.6 : const QgsRenderer* lrenderer = pLayer->renderer(); if( lrenderer == NULL ) lrenderer = new QgsSingleSymbolRenderer( ...
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2answers
33 views

Where is the QGIS API action for “deselect”?

Where is the QGIS action for the “deselect” toolbutton in the 'Attributes" toolbar? I do not see this action in the QgisInterface class or do not recognize it by name. Is it missing from iface? I'd ...
2
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3answers
98 views

How to project a layer from WGS84 lat/long (automatic projection) to WGS 84 UTM Zone 23S in QGIS?

So I have a vector layer of polygons in WGS 84 lat/long (i.e. using the automatic projection for lat/long and WGS84 datum). I want to change that to WGS84 UTM 23S in QGIS. I tried doing like online ...
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0answers
25 views

Problem with making raster from Aspect and wind direction data [duplicate]

I know its not correct to ask for work flow, but I am learning by doing and now I don't know how to move on. I'm trying to make new raster which will represent the facing sides of hill around a ...
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1answer
39 views

How to calculate zonal statistics from multi-band raster for each polygon using python?

I want to calculate the zonal statastics from multi band raster for a polygon layer. When I am using this snippet of code: vectorlayer=qgis.utils.iface.mapCanvas().layer(0) rasterfile = ...
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0answers
39 views

Tables not showing within schemas following Table retrieval in QGIS (Oracle Spatial)

When connecting to an Oracle Spatial database, QGIS is not consistently populating the list of tables under each schema. When I try to expand a schema (as I have tried to do with PARKING in the ...
6
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1answer
173 views

Downgrade to long term release QGIS with OSGeo4W?

QGIS this year split into two branches: Latest release (now 2.10.2) Long term release (now 2.8.2) I am not sure how is it normally in larger companies but I think having (hard)core GIS employees ...
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2answers
34 views

Exporting from NVIZ

I need to export a 3d model made from a DEM with a satellite photo draped over it. I'm using qGIS 2.8.2 and NVIZ, and am having a few problems. 1) How do I get a full colour image draped over a DEM ...
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1answer
68 views

How to get smooth contours from points or IDW raster in QGIS

Hello I'm an artist trying different ways of drawing contours in QGIS using points with income values. I've been able to import a shp file with the data, create a layer with centroids of the census ...
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2answers
39 views

Clipping polygon layer by raster value

I've seen many ask how to clip a raster via a polygon mask but have yet to find the opposite operation. How does one clip a polygon layer via raster? ta Specifically how does one clip a polygon layer ...
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3answers
150 views

Creating disease risk map in QGis

I would like to create a risk map using RFE Data and Tiffs but now I realised that I actually have no idea how. I have dowloaded .Tiff(Region), .hdr and .bil(Rainfall/RFE) files from the USGS page, ...
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0answers
24 views

Creating a 3D model of airspace that I can interrogate to see if some other feature (like a tree) will intrude into the airspace

The goal is to create a 3D model of imaginary planes in space that I can interrogate to see where other objects in the vicinity of the model cut through any part of that plane. For example, an ...
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1answer
62 views

Where did Processing Algorithms go?

I have recently installed QGIS 2.8.2 on my Windows 8.1 laptop with the stand alone .exe installer. The processing toolbox is missing the GDAL/OGR, GRASS, QGIS algorithms, Saga and the Orfeo Toolbox ...
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2answers
24 views

NNJoin, MMQGIS and Nearest Neighbor QGIS failed to measure shortest distance

I have two layers, one point and one line. I need the distance to the closest line from the point layer. Not NNJoin, MMQGIS nor the distance hub in QGIS provided accurate measures. Any ideas?
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1answer
19 views

Right coordinates for data defined position of diagrams

I'm using QGIS 2.8.2 and want to define the position of diagrams with x and y coordinates. The same thing works with the labels, but when I define coordinates for the diagrams they just disappear. ...
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0answers
23 views

QGIS Admin Lock Folders so my Users can't Delete / Move in Map Legend (Table of Contents)?

I am running a custom QGIS project, and I want to be able to keep my users from moving files that are within a specific folder - they keep moving them on accident - is there an environment variable ...
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0answers
27 views

QGIS - Custom Icon to Show my Tool is Running?

I am running QGIS 2.6.1 (Brighton) I've some developers that have made some custom plug-ins, but our testers are complaining that they cannot tell when, if or what tool / plug-in is running. Is there ...
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0answers
28 views

Finding angle to north on image with three control points

So I am working on some software that geolocates spots on a map taken from a drone. I am having some trouble with the actual geolocation when the map that the program is given is not aligned north. ...
2
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1answer
18 views

Qgis load a set of excel points into a googlemap with only one point with real coordinates

I am working with a google map on which I want to attach a grid of five points. Only one of them has real coordinates in the centre, point O ( 8.32688E, 48,32933N). For all the rest only the excel ...
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0answers
7 views

Problem with the DSID Data Set Identification

In my s57 file, I need to set the extent of the mapcanvas, for that i use : mpMapCanvas->setExtent(mpS57->mMapplay.value(DSID)->extent()); but if I display the value of the extents xmin, ...
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11 views

Orfeo ToolBox otbcli_BlockMatching disparity map interpretation

I am correlating two bands of the same sensor that are shifted by few pixels. I use for this the orfeo toolbox with the library otbcli_BlockMatching. Here after an example of command line I use: ...
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0answers
24 views

Spatial segregation from a raster of racial distribution in the USA

I am trying to measure the degree of racial segregation at some geographic level (let's say the county level, for simplicity) in the USA. I have a shapefile with these geographic units. To do so, ...
0
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1answer
26 views

Importing TIF raster in QGIS, default color band

Where can I change the default color bands for importing raster images? When I import a TIF image the green color band is not set causing a purplish image. When I set it in the properties it views ...
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1answer
32 views

Copying attributes from point layer to memory linestring layer PYQGIS

I've stacked a little bit with copying attributes. I have a Point Layer created from .csv file. For each feature in this layer, I'm creating a new Polyline geometry in memory layer. Cannot add ...
2
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1answer
61 views

How to avoid a QGIS crash when it is appended a symbol layer in a symbol?

When I run the next code at the Python Console of QGIS with a line vector layer: symbol1 = QgsLineSymbolV2.createSimple({'penstyle':'solid', 'color':'black', ...
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1answer
28 views

How to Join Intersected Points by Location

I extracted nodes from polygon parcel layer by Geometry Tools > Extract Nodes. However there are many crossed unnecessary points with same location after extracted nodes. There is a topic like this: ...
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1answer
21 views

Problem with QgsCoordinateReferenceSystem

I would like to change the coordinatereferencesystem for my application I have this code : QgsMapRenderer* myRender = mapRenderer(); mQgsCoordinate = new ...
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0answers
13 views

Large-Scale Mean-Shift segmentation (orfeo toolbox) with TOA values

I have converted DN values of Landat 8 OLI to Top of Atmosphere (ToA) Reflectance using GRASS 7 and I would like to know if the Exact Large-Scale Mean-Shift segmentation (LSMS) from Orfeo Toolbox ...
2
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0answers
34 views

Multiple layer intersection

I am trying to find a way with qgis/python to get the intersection area of more than 2 layers. All the tools in Qgis take just the 2 input layers. ='( For example in the image below, I have 4 ...
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0answers
14 views

QGIS LRS Plugin [closed]

I am new to QGIS. I have recently installed LRS plugin. I can't seem to activate ok button in calibration. I have shape file with well define line string. Any suggestion ??
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30 views

Map mobile phones antennas

Is it possible to find a map of Italian mobile phones antennas (and possibly also European one)? I need to import it in QGIS so it would be great a shape file or dxf file or something related to ...
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1answer
34 views

How to bind attributes to a Qt custom form?

I have followed this helpful post on creating a custom form. I have named the Qt objects the same as the fields in my attribute table. I have also set the edit widget properties to text edit for the ...
3
votes
1answer
52 views

What's going wrong when I reproject raster in EPSG:32115 in QGIS?

I wish to make a QGIS project with an orthoimagery layer and a vector layer of GPS points. I'm using QGIS 2.8.2, 64 bit, in Windows 7 on a Lenova t430 laptop. Raster is in EPSG: 32115 (mercator, ...
2
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1answer
40 views

QGIS how to group by a category and sum multiple variables within that category?

I'm using QGIS for some analysis. I have data in this format: Name is a text variable and categories are all integers And I want to generate a sum for all categories for each name, ie a table like ...
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1answer
41 views

Orphan road segments

I am working with OSM road data for a developing nation. Included in the dataset are various small networks of roads that are orphans or islands i.e. not connected to the main road network. For ...
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0answers
25 views

“Impossible to engage a segment in the current layer”

How can I fix this ? My problem is the red "x".
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0answers
27 views

Are QGIS and Neo4j a good match?

I'm having some problems with Neo4j Spatial and OSM. http://stackoverflow.com/questions/31523109/how-to-run-neo4j-with-osm-and-neo4jspatial I'm considering using QGIS + Neo4j is that possible? Any ...
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1answer
41 views

Connect a point geometry with a graphics label on a map

I am creating a map with traffic signals in a city. Creating a point layer and adding my symbols as SVG mark is appropriate for 90%. But some signals explain alternativ routes used during events. ...
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2answers
52 views

How to sum values of overlapped pixels in thousands of rasters layers and clip it using a polygon in QGIS?

I have a lot of rasters files (more than 6000), each one represents the presence and absence of a species (1 for presence and NoData for absence). The set of rasters covers the whole Latin America ...
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1answer
61 views

Determine start/end points for line slope calculation [duplicate]

This is a follow up question based off of this question. I have a line feature class representing storm drains and a point feature class representing where storm drains are connected. The point ...
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22 views

How can i upload two CSV file in QGIS Desktop App?

If I am using single file upload code it will work fine. self.dlg.lineEdit.clear() self.dlg.pushButton.clicked.connect(self.select_output_file) But I want to add more than one files it will give me ...
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0answers
17 views

QGIS use item id in print composer for relations

i'm trying to use the item id in the print composer of QGIS to build relations. for example: i have a label with the text "test" in it and it has the ID=label1 -> now i have a second label in my print ...
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1answer
27 views

How to style a vector layer in QGIS using hexadecimal color code stored in attribute?

I have a polygon shapefile storing hexadecimal color codes in a specific attribute. gid | label | color ---------+-----------+------------ 1 | Crops | #FF5F2C 2 | Forest ...