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

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3
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162 views

How to achieve better Dissolve results?

I applied the Vector>Geoverarbeitungswerkzeuge>Auflösen (Dissolve) on a zoning plan (see picture zoning plan). I used the attribute village name as the dissolving criteria. The resulting geometry for ...
3
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265 views

Building Qgis-1.8 on Scientific Linux - a sip error occured

I'm on Scientific Linux 6.3 and after trying to build Qgis 1.8 fter "ccmake" I got the error: [ 89%] Built target translations [ 89%] Generating analysis/sipanalysispart0.cpp, ...
3
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72 views

Can QGIS give GeoJSON layers a meaningful default name?

When I add a GeoJSON layer to my QGIS project, it always gets the name OGRGeoJSON. This is in contrast with shapefile layers, which seem to be named after the file name by default. Is there a way to ...
3
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111 views

Why doesn't Polygonizer copy the line ids to my polygonized shapefile?

I am trying to convert a line shapefile into a polygon shapefile using Polygonizer plugin, and when my new polygons are created all the cells in my id field are "Null", although I have clicked "copy ...
3
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69 views

Detect connections along shapefile in QGIS?

I have a set of polylines and a set of points that lie along or very near to the polylines, and I need a way to measure which points are connected to each other along the polylines, and what the ...
3
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180 views

QGIS: GPS Tracking with improved Altitude

I am preparing for archeological fieldwork in Sudan. I recently came up with RTK equipment and software using RTKlib to export the real time corrected data (cm level) to QGIS via a simulated NMEA ...
3
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240 views

How do I access layer attributes from within QGIS' manageR plugin?

This is probably a fairly basic question, but searches for manageR come up with a lot of noise, and there's no manageR tag. What I'd like to do is load the attributes from a particular field of a ...
3
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218 views

How to symbolize vector features using RGB values stored in three fields?

I need to symbolize a vector layer in Arcmap based on RGB (or HSB - can do either) values found in fields in the attribute table. I'm working with up to 10 different datasets, each with over 100 ...
3
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167 views

How to debug Quantum GIS PlugIn Visual Studio DLL?

I develop a Quantum GIS plugin layer using Microsoft Visual studio and placed it in my plugins folder of my customized quantum gis application. I now intend to debug the DLL using Microsoft Studio. ...
3
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140 views

Does QGIS have WMS-T (WMS with time) support?

Does anyone know if there's support for WMS-T in QGIS? Through the app I can add WMS layers, but I can't work with WMS-T (there's no place to set the time parameter). I been going through the the ...
3
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223 views

How to access tiles in Tilecache using QGIS?

I've Mapserver set up with a mapfile that points to a tileindex. In QGIS I can call the mapfile and view the rasters dynamically. I've got access to tilecache and I've seeded the same mapfile/rasters ...
3
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158 views

How to do bivariate or multicriteria line symbolization in QGIS?

Bonjour, je cherche à faire sur Qgis un tracé d'un itinéraire avec comme légende une couleur pour le type de route et la largeur du trait pour la fréquentation de cette route. J'ai vu qu'il était ...
3
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168 views

How to create unfilled circles (style) for point layers?

I have a point layer and want to visualize it with unfilled circles. It is only possible to change the colors and size of the symbology layer (single mark). But I would like to change the filled ...
3
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346 views

How to set up a QGIS project in MVS 2008?

I have built QGIS using Visual Studio 2008. I would now like to start using the QGIS API for Windows Development. Of course I have Qt installed on Studio I hope correctly. I am new to Visual Studio ...
3
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381 views

How to offset points along line in QGIS?

I used the "Profile from Line" plugin to create evenly spaced points along a line in QGIS, but I'd like to offset them to either side of the line. I spose I could draw two lines parallel to the ...
3
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296 views

MapServer WMS feed and QGIS

I've managed to create a WMS feed from Mapserver showing a tileindex to some rasters and a shapefile and it appears in my browser OK. If I go to QGIS (1.8.0 Windows StandAlone) and I connect to my WMS ...
3
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233 views

Why do our .shx files disappear?

We are using QGIS in our workgroup, and have recently updated to 1.8.0 Lisboa. To share our file structure we are using egnyte similar to dropbox. We all use Mac OS, and have used QGIS for years, ...
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1k views

How to open a file geodatabase with tables and relationships in QGIS?

How can I open or connect to an ESRI file geodatabase in QGIS? I don't want to only see the features (shapes), I want to make sure that tables and relationships are opened correctly, too. Thanks in ...
3
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289 views

Freehand plugin query

I've installed the QGIS 'Freehand' plugin and I have a query regarding it. When drawing a polygon qgis automatically closes the polygon when the pen leaves the graphic tablet. Is there any way to ...
3
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375 views

How to reverse-georeference with QGIS?

I have a map with a "strange" projection (it's basically hand-painted, not an exact one). I can easily georeference it in QGIS using the Georeferencer plugin and the Thin Plate Spline transformation ...
3
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410 views

How to export multiple Shapefiles to one KML file in QGIS?

As the title says, is it possible to export multiple Shapefiles to one single KML in Quantum GIS (Similar to "Map to KML" in ArcMAP)?
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822 views

How to create point labels from midpoints of road polylines in QGIS?

Heres what i want to achieve: i have a roading polyline layer (singlepart ie has several features per road, grouped by an id field), and i want to (after merging the parts) find the mid point of the ...
2
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0answers
12 views

QGIS: Need to remove unwanted white bands when raster layer are overlapping

In my project when raster layers are overlapping a white band appears the edge of the top layer. How can I remove it and obtain a seamless overlapping of the raster ? (I have try to built a vrt with ...
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34 views

Ripley's K function Interpretation, and another R questions

I'm a self-taught person, I'm studying the K Ripley's function and I would need some person who give me some advices. First, I have written a little script of R in QGIS processor: ##Point pattern ...
2
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42 views

Need help selecting strange line-like objects

I'm having a difficult time trying to select what seems to be a dead polygon. Does anybody know how do I get rid of those? select and delete operations. I'm attaching an image to help me explain ...
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20 views

PostGIS query with input from point layer

I have a table of rivers in PostGIS, each river linking to its outflow. I also have a QGIS layer of some selected sources, and would like to select the entire river downwards from each source (i.e. ...
2
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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, ...
2
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30 views

Label pie chart in QGIS

1.How can I label the pie charts in QGIS so the labels are written under the diagrams? My pie-charts are representing localities: such as villages, towns, cities. So, I want that their names appear ...
2
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35 views

Is there a “Disperse Markers” tool for QGIS?

I am using ArcGIS, but either I would like to use QGIS and maybe want to switch completely later. A have a point overlapping problem, as a result of geocoding of addresses. I have not found any ...
2
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0answers
23 views

QGIS : launch Atlas composer generation from command line

I am using QGIS 2.2 and have configured a composer with atlas generation. I would like to launch this atlas generation every day. The idea is to write a batch and launch it with a cron. Is it ...
2
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0answers
53 views

QGIS is not working with Postgres Plus Advanced Server

We have a problem to integrate GIS software with our GIS database which is populated on Postgres Plus Advanced Server 9.2 from EnterpriseDB. We are using QGIS to maintain and analyze our GIS ...
2
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21 views

How to bring feature selection into Printing Composer?

I'd like to make maps of Finland's municipalities. Our National Land Survey provides data I can make into a Shapefile, and when a municipality is selected in QGIS/Identify Features, three different ...
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63 views

can't get QgsGraphAnalyzer to work on a standalone script

I want to use QgsGraphAnalyzer.dijkstra in a standalone script. using version 1.8 I am following the guide at: http://www.qgis.org/en/docs/pyqgis_developer_cookbook/network_analysis.html Here is my ...
2
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0answers
51 views

length and width of polygon

how can i find polygon's length and width in Qgis(regular polygon and irregular polygon)? i have area and perimeter but possible to have length and width ?.
2
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0answers
60 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): ...
2
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136 views

Raster slightly displaced after exporting from PostGIS database

With the following queries I've exported a raster (GTiff) from my postgis database: 1.Creating a large object: WITH buffer AS ( SELECT id, ST_Buffer(geom,50) AS geom FROM ...
2
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0answers
103 views

How to eliminate gaps and overlaps in a layer of SpatiaLite table?

I'm try to snap all polygons in a table to remove gaps and overlaps. I can remove gaps but get new overlaps. I have no idea what doing wrong... sorry, I'm new in SpatiaLite. I tried the following: ...
2
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0answers
48 views

Using Field Calculator to Convert Data Type In Field

I am trying to convert a field that is listed as "String" because it was imported into QGIS as a CSV (rural poverty population percentages by county in NC). I need to convert the percentages field ...
2
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0answers
62 views

How to open QGIS attribute table in form view using Python?

I've got a plugin where I load some layers. On the last layer loaded I show the attribute table. I would like to select the view different from the table view (see image). How can I do this in Python? ...
2
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0answers
60 views

Zonal Statistics Freezing QGIS 2.2

Running on Windows; 8gb memory, 500gb HD, i5 cpu; Raster file: 250mb I am having a problem with zonal statistics advancing past 17%. I am trying to run statistics on a crop grown in certain counties. ...
2
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0answers
40 views

QGIS Labels: letter or word spacing ignored after export

My line label have letter spacing of 3px (Layer Properties -> Labels -> Text -> Spacing -> Letter). In print composer everything is drawn like I want it but after export to svg, pdf, or image the ...
2
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0answers
90 views

Does QGIS support .sld style files for raster layers?

I'm currently looking at the documentation for geoserver, and I'm trying to load a raster and .sld file in QGIS to see if I can edit .sld files for raster layers. The .sld and raster are located here: ...
2
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0answers
55 views

Bivariate Mapping (running a single variable regression and mapping r-squared value)

I am hoping to produce a bivariate map displaying the correlation between two variables (specifically percent SNAP participation by county against several social variables). I would like to produce ...
2
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0answers
128 views

Snap points to line and calculate chainage using Open source GIS

I have a line layer (representing a pipeline) and a points layer (representing valves) and I would like to calculate the chainage of the valves along the pipeline. I assume that I would first need ...
2
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0answers
51 views

How to set posgis default sequential value in a QGIS “editable” view?

Introduction In a QGIS project I have a VIEW, that I want to became editable (I'm trying to replicate the versioning system used DB Manager with some tweeks). Therefore I created a few rules to ...
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0answers
85 views

Move Scale Rotate raster in Qgis

I have some archaeological scanned raster that they have a north arrow and a scale bar. There is no grid, no coordinate system.I would like to put those files in a general map. I don't care about the ...
2
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45 views

QGIS: rotatable markers with offset from point

Im wondering, if its possible (in QGIS), to set a rotatable marker with offset from point, like in my example below. Any suggestion?
2
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0answers
81 views

How can i add a north arrow in QgsComposition?

I'm trying to add an svg image of north arrow in QgsComposition using this code: mapRenderer = iface.mapCanvas().mapRenderer() theComposition = QgsComposition(mapRenderer) ...
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87 views

How to display images as cross sections in 3d

I want to display a base map and several vertical cross sections in 3D. The base map image is easy to rectify as a geotiff. How can I also display the cross sections? The cross sections are at ...
2
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0answers
108 views

How to add an offset to a GeoJSON layer in Leaflet?

Using the example GeoJSON tutorial code at leafletjs.com. Change the myLines variable so that the two lines overlap, but run in opposite directions as follows: var myLines = [{ "type": ...