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

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1answer
140 views

How to set field values as labels in QGIS2 Print Composer

I am mapping the distribution of 325 bird species, displaying circles in the grid cells each species occurs in. The data contains as many duplicates of the NAME as there are cells in which it occurs. ...
0
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2answers
87 views

Where to find the “contours from points” model in QGIS 2.6?

I can't find the example model "contours from points" in QGIS 2.6. Is there another tool for creating contours from points, besides the QGIS Contour plugin?
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4answers
1k views
+100

How to generalize a polygon file and maintain topology in QGIS?

I have a polygon Shapefile, which I need to generalize. How can I generalize the poligons and ensure that there are no topological errors like "slivers". I already tried: Vector -> Geometry Tools ...
3
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0answers
52 views

How to simplify polygon shapefile and maintain topology? [duplicate]

I'm looking for a straightforward answer that actually works...not a 'duplicate question' flag. None of the other solutions posted in similar threads actually work...they all have dead-end answers ...
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0answers
24 views

How to zoom past 1:1433 with Openlayers plugin in QGIS 2.6?

I am editing the polygon shape file in QGIS 2.6 with the projection of "USA_Contiguous_Equidistant_Conic" but i can't able to zoom in the open layers like Google maps and bing maps morethan 1:1433 ...
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0answers
24 views

Mapfile generation from QGIS project

I am looking for a way to transform a QGIS project (.qgs) to a MapServer Mapfile (.map). I am using Quantum GIS 2.6 and MapServer 6. The layers are postgis tables. I would need something like this ...
2
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1answer
68 views

Zebra grid is not displayed in map composer

in Qgis 2.6, in Map composer, while selecting grid frame style as Zebra, it does not works. Also while drawing coordinates points as exterior in map convas, it is not displayed. Actually I am facing ...
1
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1answer
42 views

How to develop c++ standalone QGIS C++ Application

I want to integrate QGIS in QT\C++ application. I try to write basic C++ apllication to render map and build it using MSVC 2010. class PostGisViewer: public QMainWindow { public: PostGisViewer(): ...
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1answer
51 views

How to move a layer in QGIS Toc above an existing group?

If in QGIS TOC a group already exists and I add a new layer via QgsVectorLayer* lyr= mQGisIface->addVectorLayer(uri->uri(),Title, myProviderName); the new layer will be inserted within the ...
3
votes
2answers
632 views

How to debug 'Layer is not valid error' from Python plugin?

I'm trying to understand what goes wrong with a QGIS python plugin. Basically I'm trying to render a series of POINT. The query works fine, at least giving it by hand from inside PostGIS DB: "SELECT ...
1
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1answer
132 views

QGIS how to compute a trendline of two point lines? [on hold]

Does anyone know how to compute a trendline for two lines of points? I have two lines of points of a 10 km long urban road. 1st line is one driving direction and the 2nd line of points ist the other ...
0
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1answer
18 views

spatial analysis by attribute value

I have two vector layers, one contains actual values (in this case % cover of native species), the other contains target vales of the same attribute. the polygons are not always of the same geometry. ...
3
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2answers
103 views

How to Make an Outside Buffer in QGIS?

I have a layer of street segments that are within a given distance of a fire station. Now I want to make a border around these street segments. If I use Buffer, it puts a buffer around each segment. ...
0
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0answers
11 views

Join/convert points to polygons [on hold]

(I am using QGIS 2.6 Brighton) I have 2 shps, one points and another one polygons. I need to make them one. Is there a way to join them or convert the points to polygons? Vonoroi doesnt work for me ...
2
votes
2answers
56 views

How do I select a point imported from a GPX file?

I imported several GPX files and added a raster basemap for reference. The GPX files contains tracks so the points are sequentially numbered. I'd like to identify one of the points so I edit the GPX ...
2
votes
2answers
68 views

How can I transfer waypoints and tracks from Base Camp into QGIS2.6?

I'm working on transferring all my field data from Garmin Base Camp onto QGIS. This is an attempt to overcome the learning curve from basic trail GPS mapping programs to the real thing. I'd like to ...
0
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0answers
20 views

QspatiaLite Snapping fails if multiple target vertices within tolerance distance

I assumed that SpatiaLite's Snapping would snap to the nearest candidate vertex - however, it turned out that the result becomes unpredictable, if there are several target vertices within tolerance ...
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0answers
11 views

Field Calculator stopped working

The field calculator seems to have stopped working for one of my attribute tables (it works fine on others). No matter what I get it to express (I've tried simply 2*2, just as a test) it just produces ...
3
votes
1answer
264 views

Clip in QGIS 2.4.0 resulting in empty output files

I'm seeing the same problem to Clip or Intersection tool - QGIS giving empty files trying to use the Clip tool since upgrading to QGIS 2.4.0, but have not been able to fix the problem based on the ...
4
votes
1answer
120 views

four color theorem for QGIS 2.0 or Leaflet?

I recently looked at some other posts relating to this topic but as far as I can tell there is currently not a working plugin or script for QGIS 2.0 to achieve a four color theorem for styling polygon ...
0
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0answers
20 views

How to Create a Minimum Bounding Polygon in QGIS [duplicate]

Does anybody know how to create a "minimum bounding polygon" from a set of polygons in QGIS or elsewhere? For example, in the figure below I can create a Convex Hull per the purple outline, but I'm ...
3
votes
3answers
99 views

Plotting Geo Points with “by arc centered at” Instructions

A recent Supreme Court decision redefined the legal boundaries of California along the Pacific Ocean: http://www.theverge.com/tldr/2014/12/15/7397085/supreme-court-california-boundaries-map I am ...
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0answers
9 views

Print Composer: Finder window disappearing when pressing save button?

I recently updated to 2.6.1 (using mac OS 10.10.1). When I'm in print composer, and I try to save my map (or open a new file, or do anything that brings up a finder window), the window disappears ...
1
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1answer
26 views

How to customize the QGIS default GUI using Python?

Is it possible to hide/remove/customize the default ui of qgis using python plugin. I want to add my own menus and toolbars and remove default. If it's possible, which reference should I use?
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0answers
16 views

Is it possible to only have one Feature Attribute Window open in QGIS?

I suppose it's by design that when you click through(identify) your features, for every feature it opens the attribute window (which is good, i have enabled the checkbox to automatically open the ...
1
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0answers
24 views

Snapping while measure in QGIS?

I've been reading here and there that snapping while measuring should work in QGIS, but i can not make it work for the life of me. https://hub.qgis.org/issues/8537 All the snapping options are set ...
0
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0answers
21 views

Frontal Detection of sst & Chlorophyll image

I'm searching for a tool in QGIS that automatically identifies gradients(fronts) in MODIS SST image ,draw the line and generates shapefile.The tool that I'm searching for should work similar to ...
6
votes
0answers
48 views

Automated detection of tracks

Given an area with depressions in open area from; say all terrain vehicles driving on soft surface. The vehicles will cause parallel depressions (paths) of about 10-20 centimeters in depth and around ...
5
votes
1answer
364 views

QGis Zonal Statistics Plugin NoData included in Calculations

I have been trying to use the QGIS zonal statistics plugin. My raster has a nodata value of -99999 and all other values are positive. After computing the mean zonal statistics there are a number of ...
2
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1answer
196 views

Cause of ImportError: No module named mapscript in QGIS mapserver export?

I'm trying to expor project to mapfile in new QGIS Chugiak but a get this error below, someone have the same error? How can I fix this?thnks. An error has occured while executing Python code: ...
2
votes
3answers
124 views

In QGIS is there a keyboard shortcut to open/close the layers panel?

Simple question really - as titled. Is there a keyboard shortcut, or even something like a toolbar button, which would make it easier and quicker to open (and close) the layers panel in QGIS (2.6). ...
7
votes
2answers
114 views

Calculating all distances from single points to multiple polygons

I have two layers: a point layer defining properties (95 objects), and a polygon layer defining plots of land associated with the properties (211 objects). Each point relates to one or more polygons. ...
2
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0answers
14 views

Information On Supported Device Qgis Galaxy Tab 4 10.1 4G LTE

I need a tablet for outdoor work and i would know if this device "Samsung Galaxy Tab 4 10.1 4G LTE" works fine with qGis mobile application.
2
votes
2answers
104 views

Get Index for a group QGIS Python

I am trying to add new layers into a specific group which I can get to work if I know the index but how can I get python to fid the index of a group so it can load the new layer into the group ...
3
votes
1answer
938 views

legend groups and layer position/order qgis 1.8

I'm tring to programmatically create layer sequence also using groups. Simple python code: layer = QgsVectorLayer("004cp000.shp", "004cp000", "ogr") QgsMapLayerRegistry.instance().addMapLayer(layer) ...
3
votes
1answer
139 views

Programmatically change layer position in the table of contents (QGIS)

I am trying move/position a layer to the bottom of the TOC by using addTopLevelItem on all other layers. I unsure how to reference the layers as QTreeWidgetItem's. def bg_bottom_level_item(self): ...
3
votes
2answers
380 views

How to add layer/raster with specific position in the QGIS layer list?

I use addRasterLayer(rast,'Name') but this adds the raster to the top. It is possible to set position when I add raster at once? Is it possible??
0
votes
1answer
21 views

SQL-Like Inner Join on IDs in Two Layers in QGIS

Using QGIS v2.6.0-Brighton. This question is not about editing layers geographically in anyway. It is merely trying to find data from two layers as you would in an SQL Query and append an extra ID to ...
1
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0answers
12 views

Aggregate nearby points to develop equally sized regions in QGIS

I have a list of 4,500 points (lat, long, unique id, attribute). I also have a service territory which all of the points fall into. I would like to break the service territory (polygon) into 6 ...
0
votes
1answer
25 views

Print Composer: Export PDF as raster with vector labels

Is it possible (or will it be possible in the future) to export a PDF/SVG as raster with vector labels? I'm using effects (blending, transparency etc.) which I can not export as vector. So I have to ...
0
votes
1answer
46 views

Split lines by polygons in QGIS 2.4

I have a river network (lines) and a shp with states (polygon). I would like to split the lines at the state boundaries --> split lines by polygon boundaries. Is there a geoprocessing tool to do ...
1
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0answers
42 views

How to define the output raster resolution when rasterizing a vector?

I have a vector file which I want to rasterize and adjust its resolution to the reference map, in QGIS. I tried spatial_sync_raster function in R to set all the rasters into the same resolution as ...
2
votes
1answer
48 views

geting geograpic locations from an address list

I have a table with 150 addresses. I would like to automaticly generate a point shapefile/PostGIS layer from all of them. Is that possible in any way or do I have to search for every single address to ...
-4
votes
2answers
25 views

QGIS python QgsApplication.pluginPath() return wrong path in Debian

plugin_path = QgsApplication.pluginPath() return wrong path in Debian /usr/lib/qgis/plugins corect path is : /home/web/.qgis2/python/plugins/ in windows the returned path it's ok.
4
votes
2answers
1k views

Setting the extent for a QGIS map using python

I am writing a stand-alone application in Python/QGIS that simply creates maps. I want to load vector/raster layers, set symbology, set extent At the moment, that is all! Currently I am just using ...
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0answers
27 views

Opening a .rrd file format in QGIS 2.6?

Anyone knows how can i open a .rrd file (should be a raster)in QGIS 2.6? Comes with more 3 files. Should be any difference using it in OS or Windows?
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0answers
37 views

QGIS 2.6 installation error [on hold]

Does anyone know how to fix this ? I used to have QGIS 2.2 and 2.4. I've completely removed 2.4 and installed 2.6 by OSgeo4W (Advanced installation). Everything, like GRASS, tora, udig is working ...
1
vote
1answer
202 views

Convert shape file to kml without losing symbols

I am using QGIS 2.2 and want to convert a shape file containing point coordinates with userdefined svg-symbols to a kml file. Everything seems to work. The orginal file is in WGS 84 / UTM zone 32N ...
2
votes
3answers
196 views

Correct folders and conf settings for qgis-web-client with qgis-server?

I have setup QGIS server using this guide sucessfully and would now like to setup qgis-web-client alongside it. My QGIS server folder is: /usr/lib/cgi-bin For qgis-web-client I have followed the ...
7
votes
1answer
152 views

Is there a simple way to sort layers alphabetically in QGIS?

I am working on a big GIS project and not being able to sort the items in the Layers panel is giving me hard time. I can have up to 250 layers in the Layers panel. I have a special naming scheme for ...