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

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56 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 ...
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77 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 ...
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1answer
122 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
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1answer
115 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 ...
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1answer
147 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 ...
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123 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 ...
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0answers
75 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% ...
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0answers
93 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, ...
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2answers
206 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. ...
2
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1answer
134 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?
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1answer
100 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 ...
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1answer
96 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 ...
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1answer
58 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 ...
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2answers
434 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.
2
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1answer
105 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
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1answer
136 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 ...
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0answers
24 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 ...
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1answer
31 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
316 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 ...
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1answer
510 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
146 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.
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1answer
139 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
206 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 ...
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1answer
358 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
474 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 ...
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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 ...
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0answers
26 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 ...
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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
149 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 ...
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2answers
354 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 ...
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1answer
227 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 ...
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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
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1answer
466 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
334 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 ...
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0answers
103 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
212 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 ...
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1answer
212 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
256 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
votes
1answer
175 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
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1answer
118 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,
2
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2answers
347 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 ...
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1answer
76 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
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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
341 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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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 ...