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

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46 views

Raster map calculation

I figured out a way to filter a raster by using the r.mapcalculator or the raster calculator. The problem is that I have to use Qgis 2.2 because some of my models doesn't work with 2.4. In 2.2 the ...
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2answers
26 views

How to update postgis layer from shapefile in QGIS?

My usual workflow with updating layer from shapefile was to: Open DB Manager; Load SHP files into QGIS; Open DB Manager; Import file (with drop option). Now my problem is that I have created ...
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2answers
51 views

Creating a DEM from CAD contour polylines

Is it at all possible generate a digital elevation model raster from CAD contour polylines with elevations? I am using straight AutoCAD 2014, not Map3D or Civil3D. I was able to bring the dxf of ...
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1answer
67 views

QGIS to solve projection mystery in Postgresql

I downloaded some data from local agency. Per QGIS 2.2, I defined the projection to 'EPSG:3587 - NAD83(NSRS2007) / Michigan Central' in postgresql (maybe ArcMap). Data is in Postgresql 9.3. I am ...
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0answers
62 views

offline editing not working on qgis mobile

I would like to work with offline editing using Qgis desktop and Qgis Mobile, in the first essay i tried to use Qgis 2.2 and its offline editing plugin , it has worked fine then i moved the qgis ...
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19 views

Convert colorized/styled vector (KML or qgis-project-origin) to raster and preserve the colorization

I can very rapidly create nice heatmaps (chloropleths actually) using qgis that I can then export as kml's that have the correct colorization when displayed on Google Earth, etc. I'm wanting to ...
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1answer
28 views

Cut polygon shapefile by line shapefile

I have two shapefiles, a polygon shapefile (lake) and a line shapefile (boudary) I want to create a new shapefile "polygon to the north of the boundary" What tool can I use in QGIS or other free ...
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1answer
21 views

Programmatically setting ui for QGIS via setEditForm()

I've been following this thread in attempts to configure my ui preferences programmatically. I've had no issues with loading styles (which subsequently sets the custom ui if I saved it this way), but ...
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0answers
19 views

QGIS Reshape Tool

I just downloaded Quantum GIS and have been playing around with the editing features. For some reason, the Reshape Tool is not working for me. The manual said that at the end, you right-click and it ...
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0answers
71 views

distance difference in Google Earth with exported GPX or KML compared to source shapefile

I've converted a shapefile (points) to KML with QGIS. Points in the shapefile are within 100m distance from each other. When I measure it in Google Earth, the distance changes to 80m. The same ...
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2answers
150 views

How to bulk print maps using ArcGIS or QGIS?

I have a polygon layer that I would like to print images or PDFs from in bulk as there are a large number of them. Rather than having to manually scroll and print each individual'site' in the print ...
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1answer
38 views

Translate coordinates in GeoJSON export

I am wondering if there is a way to apply a translation in coordinates for a GeoJSON export. Currently, there are negative coordinate values in my export, which I cannot have. I am trying to use ...
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0answers
8 views

How to debug a QGis C++ plugin with Visual Studio 2008 [duplicate]

I have a plugin for QGIS 2.2 in C++ (legacy). I dont find how debugging this plugin, with Visual Studio 2008 (for evolution, etc.) Sorry for my bad english. Thanks you ! Paho
2
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2answers
110 views

How to set NULL as default value for a date field in QGIS 2.4?

In QGIS 2.4, i am unable to set the default value as NULL if i have not updated any value on date fields. Its automatically taking the current system date. I am expecting to set the default ...
1
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1answer
54 views

Help choosing an appropriate GIS solution for the following question [closed]

I am currently researching for an appropriate GIS solution. My requirements are pretty simple: Ability to create circles, symbols or diagrams with transparancy tied to their geographical location ...
1
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1answer
20 views

Adding shapefile elevation data to dted

I am a newbie to QGIS. Currently trying to augment a dted raster value file with vector shapefile(polygon) containing height of buildings. Have converted the shapefile into raster via rasterize ...
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0answers
17 views

svg export not keeping line widths

I just upgraded to 2.4 I have noticed that when I export as an svg, for opening in illustrator, the line/pen/border widths are coming out all different. For example a line width of 0.25 in QGIS is ...
1
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1answer
115 views

How to save and load vector layer attribute value map, editable state in .qml style file?

I just upgraded to Qgis 2.4 and there were problems with style file: When I load style file for Qgis <= 2.2, the color of features is right but when I edit them, the value map (value - ...
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1answer
34 views

Error using 'Join attributes by location' via Python

Trying to run a simple script using qgis:joinbylocation but getting either errors or it's not processing correctly. I don't want to take a summary of the attributes, just the attributes of the first ...
3
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0answers
89 views

Why does multi-threaded rendering not use all the CPU potential in QGIS 2.4?

I have just downloaded QGIS 2.4 which is great and ran some tests. I have enabled the multi-threaded rendering but it seems that the program do not use all the potential of my CPU. Attached pic shows ...
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0answers
27 views

QGIS Init script: How to get active layer and GID of edited object?

I would like to ask, how to get the GID (from Postgresql+Postgis) and active layer of edited object in QGIS Init script (Python)? Code Layer=qgis.utils.iface.activeLayer() works in QGIS console, but ...
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2answers
57 views

How to use values such as 2014-03-31T15:00:33.000Z in QGIS Time Manager?

I´m trying to use the QGIS Time Manager plugin but I have a problem with my attribute columns. Time Manager supports %Y-%m-%d %H:%M:%S format but my dataset uses the following format in the timestamp ...
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0answers
28 views

Standalone QGIS application - handling QgsVectorLayer load errors

I am creating an application with QGIS libraries, and in the event that the app can't add a specified layer (e.g. no connection to host, no password specified etc), it causes the app to crash, ...
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0answers
20 views

Low quality legend in QGIS [duplicate]

I am sorry to repeat a question already asked by someone else, but it has not been answered yet. When I create a map in QGIS the legend symbols for some reasons have a very bad resolution and are not ...
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1answer
83 views

Calculating the fractal dimension of a line segment

I have a shp file with hundreds of features that represent clipped segments of coastline. Each segment is made up of many vertices (dozens, perhaps even hundreds). (FYI, the segments were created by ...
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0answers
33 views

makefile generated using QGIS Plugin builder cannot find pyuic4

I have QGIS 2.4 installed using the OSGeo4W installer. I have the bin folder in my path and I can run pyuic4 successfully on the command line using osgeo4w.bat, but when I try to run the makefile ...
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1answer
30 views

Replacing PyQt4 with PySide with standalone QGIS

I would like to develop an application using the QGIS libraries and PySide instead of PyQt4 due to more flexible licencing, I wonder if this is possible. I downloaded PySide and replaced my ...
1
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1answer
165 views

How to install QGIS 2.2 instead of 2.4 to get a working OpenLayers plugin again?

I use ubuntu . I don't know how to return installed qgis 2.2 I try uninstall qgis 2.4 and try find how to install old version qgis 2.2 Please .. tell me how to install old version qgis 2.2 for ubunut ...
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0answers
20 views

QGIS --> ArcGIS server by WMS? [duplicate]

I have found this post: Quantum GIS ->ArcGIS Server configuration possible? My question is more specific >> Can I publish feature layers to ArcGIS server from QGIS using WMS?
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1answer
19 views

How to install pgRouting in Ubuntu 14.04?

I want to install pgRouting in Ubuntu 14.04 LTS. I added the respective repository (https://launchpad.net/~georepublic/+archive/pgrouting-unstable?field.series_filter=trusty) but failed to install the ...
2
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1answer
42 views

How to install PostGIS Manager and RT Sql Layer plugins in QGIS 2.4?

This might be a rather simple question, but both plugins are not visible in my QGIS menu. I'm running 2.4 on Ubuntu 14.04. Thanks for every piece of advice.
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10 views

tilestache wms layer in qgis and open layer rendered layer

I have setup tilestache and styled a map for using mapnik xml and I can call on the url in a web browser, how can I call the url for a wms layer in QGIS or is there a way to view mapnik xml in qgis. I ...
1
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1answer
33 views

How to interact with other layers in a QGis Python init function?

I am using QGis and making a Python script that sets the Python Init function to a custom UI file. I have a function with the following signature: def formOpen(dialog, layer, feature): ... I ...
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0answers
19 views

Error when providing “Python init function” from Python script in QGis

Problem I am using QGis and Python scripting to programmatically set a layer's edit form and "Python init function". It appears that the Python init function is called correctly in one situation ...
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0answers
10 views

QGIS view bounding box on Add vector layer GeoGSON protocol?

Our server can serve GeoJSON with an optional bounding box HTTP parameter. e.g. http://our_gis_server.org.au/layername?bbox=xmin,ymin,xmax,ymax In QGIS I can add this vector layer as a Protocol and ...
2
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1answer
59 views

Is it possible to rotate the *canvas* in QGIS

Can the canvas be rotated so north is pointing in some other direction than defined by the projection? This question answers with respect to the composer, but not the canvas. There is a related 5 year ...
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2answers
104 views

How to determine which polygons, if any, points fall within?

I am a amateur at GIS and need some help. I have a group of shapefiles of various areas and an Excel spreadsheet of addresses I have geocoded to points. I want to determine whether each point falls ...
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0answers
26 views

pyQGIS (Spatial Join): Sum features of attribute from point layer and join with vector layer

I am new to Python and QGIS. I have avoided asking questions up to now. But by now I have developed a reasonable idea of where i want to go so and where I am stuck. So, I have decided to ask but sorry ...
0
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1answer
56 views

What is the typical v.surf.xxx exicution time?

What is the typical v.surf.xxx exicution time? I am trying to run v.surf.bspline on a set of ~1600 points. It has bee running for about an hour now and is stuck at spot indicated in the image. I ...
2
votes
1answer
47 views

Display two-dimensional color gradient for two different quantities

I have two overlapping raster layers. One contains quantity A from 0 to 100, and the other contains quantity B from 0 to 100. I'd like to create a map displaying both sets of data at once based on a ...
2
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0answers
45 views

Shortest distance from polygon centroids to a line in QGIS

To get the distance of each polygon centroid from a line, I have tried the Distance to nearest hub algorithm from the Processing Toolbox. The distances I got from the algorithm did not seem correct, ...
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2answers
35 views

Draw Vertical Line QGIS Composer

Is there a way to draw a perfectly vertical line in QGIS's Composer. I wanted to created a visual separator between two elements for aesthetic reasons. I've tried the arrow tool, removing the arrow ...
1
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1answer
35 views

Merge two geojson files

I have a global json files about countries' boundaries but the Russia is in two parts (two polygons). I want to merge the two parts in one, without the boundary at the middle. Is there a way to ...
1
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1answer
29 views

NVIS module not found in QGis

When I try to use the nvis module in Grass, QGis, pops-up a warning window saying "Module nviz not found". how can I solve this issue and use the nviz?
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1answer
23 views

Count points in a polygon that changes form (“on the fly calculation”)

I have tried to find a plugin for this, with no luck. Perhaps someone knows of a plugin that can do the following: In this project I create a lot of polygons that contain points, and the size of the ...
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1answer
18 views

Zoom to Postcode QGIS Plugin - “Postcode not Found”

I'm trying to get the Zoom to Postcode plugin for QGIS to work on my machine (Mavericks, QGIS 2.2.0) The plugin downloads fine, and when I first try to search for a postcode it alerts me that it ...
0
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1answer
27 views

QGIS processing does not support jpg

I would like to work with the gdal functions provided in the processing toolbox. It is easy to call: import processing processing.alglist() ...
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0answers
23 views

GIS grid linear interpolation for a given point

Suppose that I have a GIS grid. I need to do linear interpolation for a given point located inside a cell of the GIS grid. The locations and values of the vertices of each cell in the grid are ...
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0answers
22 views

Automating polygon mergers with python

This is the first real world python program am trying to write. I am trying to create a scrip that takes a shapefile that has n polygons with an integer formatted date (e.g. yyyymmdd or 6/24/2014 is ...
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1answer
30 views

How to modify existing grass gis tools and run them in QGIS?

I would like to take an existing tool of the grass tool box and modify the code to the specific needs of my task. As I´m struggling to start some kick-off would be great. How to access code? What do I ...