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

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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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22 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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9 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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23 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, ...
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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
31 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
20 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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0answers
28 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 ...
3
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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
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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
39 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 ...
1
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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 ...
1
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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 ...
0
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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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21 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
16 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 ...
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0answers
60 views

How to load ArcGIS-created map into QGIS?

I created a map based on a DEM in ArcGIS (with Spatial Analyst). The office I worked together with, now wants me to add some extra layers into my map for further use. The thing is, my student licence ...
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0answers
48 views

SAGA version with QGIS 2.10

I want to know which version of SAGA is used with QGIS 2.10. I developed a standalone application which uses QGIS inside. I have problems using SAGA algorithms. SAGA is well installed but I found that ...
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2answers
60 views

How to make a circular polygon in QGIS?

I am trying to make a floor plan for my office, have managed to make all of the rectangular components (e.g. the rooms) however some of the desk layouts are circular and I haven't been able to work ...
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2answers
49 views

How to create a polygon grid with un-even spacing between research plots?

I have an orthomosaic of a crop field with small research plots (3.8 X 1.44 m and 0.22m b/w plots and 0.50m b/w range spacing). I would like to create a polygon layer using this information. After ...
4
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1answer
67 views

How to visualize texture along borders of multipart polygon

I came across this map and would like to replicate the textured styling found along the borders. I'm starting with a multipart polygon but my process has perhaps too many steps. I'm using QGIS ...
1
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1answer
38 views

Need help making polygons from lines in QGIS

I am trying make a layer of buildings, divided into apartments, by making polygons from crossing & intersecting lines in QGIS. When I use the vector/geometry tools/lines to polygons tool, I get ...
1
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1answer
17 views

Setting Transparency in .IMG format

Is there a way for QGIS make just the black value (255,255,255) on an .IMG format file transparency. Right now their transparent option makes the whole image transparent.
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0answers
29 views

Where to find Advanced Python Field Calculator qgis sintax documentation

I am trying to follow some tutorials using Advanced Python field calculator, but when I enter the formula value = $geom.area() / < area> I get syntax error as in picture, while if I substitute ...
6
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1answer
202 views

How to create an Atlas based on point attributes?

Essentially I am wanting to produce an atlas based on a categorical field in a point layer. i.e. I have a point layer of childcare providers with the categorical field "Provision". I've categorized ...
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0answers
59 views

How to wait for mapCanvas render before taking a screenshot?

i am trying to iterate over a large list of features and making a screenshot of the selected feature. My problem is that it seems to be a delay between the refreshing of the canvas and the taking of ...
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0answers
29 views

How to obtain an euclidean distance raster from a vector file in QGIS?

I'm trying to obtain a raster of Euclidean Distances from a vector layer I have of a river in Spain. I did it very easily with ArcMap using Euclidean Distance, but I don't know how to do it in QGIS. ...
1
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1answer
59 views

Spatial join of a single point to multiple polygons

I have a point layer which I want to spatially join to a polygon layer (bring in the attributes). This works fine unless there are overlapping polygons, if so the QGIS spatial join tool will only ...
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0answers
47 views

How can I upload CSV file in QGIS Desktop App?

Please see link : http://www.qgistutorials.com/en/docs/building_a_python_plugin.html I am using the same process for uploading a CSV file in a folder but it gives me an error. I am using this code: ...
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1answer
25 views

Styles not applied when using QgsMapRenderer

Using pyqgis, i am trying to export some maps as images using QgsMapRenderer. Here is the layer/style setup, both load correctly: lyr = QgsVectorLayer(uri.uri(), 'Report', 'postgres') styleload = ...
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0answers
30 views

Where can I download a raster dataset with the latitude and longitude of each pixel in geographic projection?

I want to do raster calculations in QGIS based on the latitude and longitude of each pixel. The calculations will compute the area of the pixel, but also do other calculations for various projections ...
0
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1answer
29 views

Publishing QGis project on Geoserver

Is there a way to prepare a project on QGis with many layers and to publish it under wms service on Geoserver? Thank you for responses
1
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1answer
20 views

EasyCustomLabel in QGIS do not resize the labels

I use EasyCustomLabel to move some labels, but if I try to change the dimensions of the chars I cannot view any changes, both in the work and in the printing sheets. I use QGIS 2.6.1.
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0answers
14 views

How to fill a symbolLayer with a custom texture?

I have this code : pLayer is a QgsVectorLayer * QgsFeatureRendererV2 * lrenderer = pLayer->rendererV2(); QList<QgsSymbolV2 *> lSymbols = lrenderer->symbols(); QgsSymbolLayerV2 * ...
0
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1answer
62 views

How to create soil-type maps using QGIS

I am trying to create a soil-type map of an area from point data using QGIS. I tried interpolating the data, since soil is continuous. I did this by allocating a number to each point type and then ...
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0answers
24 views

How to react to network events

I am in the process of writing a Plugin which should react to some data (XML-Format) sent via a socket connection. Since I have never worked with IPC in terms of python before and my knowledge of IPC ...
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0answers
20 views

How to display attributes of features intersecting the Atlas feature in a Print Composer label?

Is it possible to edit labels with python or an expression? I have an atlas layer and a shape with countries. the atlas layer has several features and each feature intersects with several countries. ...