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

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Trouble Using Selection Expression in QGIS

I am trying to use the selection expression box to highlight counties by state FIPS. When I use the OR conditional all counties across the US get highlighted. So for example, STATEFIPS = 1 will ...
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12 views

Convert coordinates

I have some data that I need to convert to Lat-Lon in order to plot. It originally came from an Esri Shapefile which I managed to get it out of with QIS. The issue is that the coordinate reference ...
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1answer
72 views

Load and display a layer using PYQGIS

I'm having a go at using pyqgis from within the QGIS python console to load a layer from SQL Server and display it. I feel like I'm part way there but I'm having a real issue getting the layer to ...
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2 views

error (407) Proxy Authentication Required plugins mmqgis e geocoder Qgis

By using Geocoder plugins and mmqgis QGIS to geocode some addresses using Google the error (407) Proxy Authentication Required occurs. I entered the settings and put the QGIS network address, User ...
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1answer
20 views

Unknown error concurring when developing QGIS 2.0.1 plugin in Windows 7

I am following the tutorial found here for developing a simple QGIS plugin within QGIS 2.0.1 installed on Windows 7. However, as I have began to try developing a link between the GUI and each the ...
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1answer
21 views

How to I convert from decimal degrees to meters in Qgis?

I am trying to convert from decimal degrees to meters in QGIS. I have a shape file that is currently in WGS84/UTM zone 19S. I have tried the save as - browse - WGS84 EPSG:4326 but this appears: ...
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1answer
22 views

GRASS 6.4.3 installed with QGIS not working

I'm new to QGIS and GRASS. I'm trying to do an image classification and it seems that the method I need is not within the GRASS toolbox in the QGIS . So I decided to use the standalone GRASS version ...
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18 views

How do you calculate the area of polygons which overlap a buffer around a point?

I'm new to QGIS (Dufour 2.0.1) and have plotted nests as points on a googlemaps base-map and have created buffer zones around the nests. I've also plotted ponds as polygons on the same base-map. I ...
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14 views

How to split apart overlapping features

I have a set of 20 features that are the exact same shape (a rectangle) that are stacked on top of one another in qGIS. Is there a way to programmatically separate them? Ideally I'd like to separate ...
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1answer
28 views

How can i create a link to a whole folder?

I know how to create a hyperlink to a single pdf-file: Create a hyperlink to a pdf file in the attribute table But now I want to make a link to a folder with 3 or 4 pdf files in it. Is that possible? ...
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6 views

QGIS 2.2 freezes when I select a Grass command via Processing toolbox

I'm on Ubuntu 13.10, and I have never been able to get the Grass plugin to work in QGIS 2.2 via the Processing toolbox. As soon as I select any Grass command, QGIS locks up, no menu appears. I then ...
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14 views

I'm looking for an idea to calculate shortest path in a line Vector layer using a starting point

I'm looking for an idea to calculate shortest path time in a line Vector layer using a starting point in a qgis python plugin based on distance and speed. is there a solution where i can get ideas? ...
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1answer
16 views

QGIS 2.2 Atlas - Blank Export

I've got a map laid out how I want it in QGIS 2.2, using the "Atlas Generation" feature. When I preview the atlas, all 7 pages look proper and seem to work fine. However, I cannot export them to any ...
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9 views

QgsGeometryAnalyzer.dissolve problems

I am completely new to the QGIS python api and I am running into an error which I cannot solve when trying to use the dissolve class. I used the basics of the PyQGIS Cookbook. In my understanding ...
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2answers
14 views

Problems building QGIS 1.8.0

I am very new to QGIS (and the entire Linux thing). I am trying to build QGIS 1.8 on ubuntu 12.04LTS. I specifically need to use the 1.8 version of QGIS. When running the "make" command, I see the ...
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1answer
245 views

How can i merge lines with same name and intersect each other?

I have shp file with 50k lines (roads). Many roads have same name like 'high road' . some of them are the same road (they intersect each other) and some are located in different places of the city. I ...
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1answer
177 views

QGIS 2.0 callout labelling

I'd like to use callout/balloon labels for a vector layer in my GIS using QGIS 2.0. The only way I can see to do this is to position an ordinary label where I want it and then draw an empty text ...
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1answer
26 views

QGIS: Line to polygon conversion

Currently we are working in a geological project..in which all the Contacts, Linear & some other geological features have to be captured. The thing is most of the features have to be Captured as ...
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25 views

Writing a script for accessing QGIS tools for use in HTML WebPage

My objective is to write a script which uses QGIS GRASS Plugin tools and generates an IDW Interpolation Output and passes the file path as a parameter, which can be used in an OpenLayers API ...
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2answers
235 views

Is there a way to get correctly aligned print export with openlayers plugin?

I am a beginner using QGIS (1.8.0 Lisboa) on a Mac (OS X 10.6.8 Snow Leopard). I work on a file with two layers in the following sequence (top to bottom): a vector polygon layer with a few outlines ...
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32 views

How to convert this data to LatLongs? [on hold]

We have data like Number of pixels 2589, X position 359 Y position 606, and area computed as 2.217411. How to convert this data to LatLongs? it should ...
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1answer
35 views

How to make river lines intact between confluences in QGIS?

I got a river shapefile below, and I found that there are many fragmental lines in this line shapefile, like, and, Most of these are located around the confluence(node), and how can I do to ...
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28 views

Looking for QGIS 2.0.1 [duplicate]

So I deleted my old version of QGIS Dufour (2.0.1) with the intention of replacing it with the new version (2.2). It wasn't until I deleted my old version that I realized my Mac OS 10.6.8 is not ...
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44 views

Issue blocking QGIS feature form dialog with Python

I'm not sure where I'm going wrong with this python logic for a custom form in QGIS 2.0.1. There are a few things required by the validation function: that index of combo boxes aren't 0 (first index ...
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2answers
43 views

Select polygons that do not intersect any other polygon using QGIS, GRASS, SAGA or R

I would like to select the polygons of the layer below that do not intersect with any other polygon (within the same layer). How can I do this using QGIS, GRASS, SAGA or R?
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2answers
78 views

Saving a gml layer does not change coordinates

I am trying to export a gml layer to geojson with lat/lng as the preferred coordinate system. So what I did was a 'save as' on the layer with selected CRS: 'IGNF: WGS84G'. Now I was hoping it ...
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1answer
129 views

How to draw a custom map on top of base layer

I'm looking for the easiest way to draw a custom layer and export it as a tile cache. Basically what I would like to be able to do is load a base layer, and then draw objects and annotations on top ...
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1answer
86 views

Find directly joined neighbour points using a different line layer in QGIS

I have two layers of data: A set of points showing every significant point on the UK rail network (Network Rail Stanoxes). These are a mixture of stations, junctions, timing points and signals. An ...
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2answers
39 views

Convert from Julian Date to Calender Date in Field Calculator

Does anyone know of a way to convert from a Julian date to a regular calender date in either QGIS or ArcGIS field calculator? Thanks...
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3answers
131 views
+50

Is there a way to call the clip function in pyQGIS from the python console?

Is there a way to call the clip function in QQGIS from the python console? It is found under geoprocessing tools in the vector menu.
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14 views

custom toolbar combobox: issues with adding functionality

I've added a combo box to my custom toolbar in QGIS (based on this thread QGIS - Add a combobox to a toolbar), but there are two things I'd like to achieve that can't get working: first, dynamically ...
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11 views

Can't see html file on my computer when trying to create an html annotation

I am using QGIS 2.0.1 on my Windows 7 operating system. I want to create an html annotation. I have created an html file on Microsoft Word 2010 by creating the document and then saving it as a "Web ...
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1answer
28 views

In what ways has QGIS 2.x API changed making Plugin Builder Tutorial invalid?

I am working on the QGIS workshop Tutorial for QGIS Plugin Builder and notice that it is for QGIS 1.1. As this seems like a popular tutorial, in general, what are some areas of this tutorial that need ...
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17 views

Chopping vector polygons

I am a Global Mapper user. In GM we have a function to chop polygons with holes in it. Is there such function in QGis? If yes, is it available via script? I am totally new to QGis so I would ...
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2answers
1k views

How to visualize grd files in Quantum GIS?

How to visualize grd files in the software Quantum GIS?
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24 views

How can I create/draw “freehand” polygon features in QGIS 2.2?

I installed the Freehand Editing plugin but it doesn't seem to work with the latest version of QGIS; the icon appears on the Ditizing Toolbar but the icon is disabled. Is there any way to use a ...
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1answer
24 views

Extract Longitude and Latitude from Geotiff (ASTER 30m DEM)

my problem is apparently quite simple, but I cannot really find an easy answer: in QGIS I've created a raster layer by merging different GeoTiff images from the ASTER 30m DEM dataset. The merging is ...
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1answer
16 views

RasterStack extract() for duplicated dates

I have a a Large RasterStack of temperatures and a 10570 points in a Large SpatialPointsDataFrame and I'm using extract() to assign the temperatures to each point in R. ...
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1answer
22 views

Save as .csv with coordinates in both QGIS 2.2 and PyqGIS

These questions have been asked before, but since they are not answered I will try to pick up the ends here. 1) First, as stated here: QGIS 2.2 saving layer as CSV with GEOMETRY=AS_WKT not working ...
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17 views

EDGE Detection of sst & Chlorophyll image [closed]

Is there a tool in QGIS that automatically identifies fronts in SST image and concentration in Chlorophyll image.The tool what I required should be work similar as Cayula & cornillon tool ...
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0answers
35 views

How to clip polygons within buffer using QGIS?

I am trying to do the clip operation with polygons in the buffer, so far I'm getting no results. It is working for points in the buffer. Am I doing anything wrong? Basicly I'd like to include ...
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14 views

Crash upon heatmap

I am completely new to qgis. I am trying to generate some heatmaps from crime data... and failing miserably. I have tried with my own data and the data in the heatmap guide here ...
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1answer
23 views

How to export a IDW raster while keeping the search radius data

I want to export my IDW rasters that I made in ArcGIS to QGIS, however when I export my raster, the values are there but are no longer displayed. They are stored within each cell and are not ...
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14 views

QGis Zonal statistics error

I'm trying to use the processing zonal statistics tool. I just have one raster and one vector layer. The Log says always: Algorithm Zonal Statistics starting... 'NoneType' object has no ...
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0answers
21 views

Snapping issue in QGIS

I had drafted a polyline with QGIS, I want to continue that line with snapping from it's end, but snapping is not working in starting, after starting I am getting snapping. Using windowsXp and Q gis ...
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1answer
23 views

writeOGR column limit error: “Creating Name field failed”

I have a SpatialPointsDataFrame with 1057 elements and 4760 columns and want to export it to a shapefile. When I try to do this with writeOGR() I get an error: > ...
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1answer
124 views

Binding between qgis custom form (qt designer) and date/time field in a spatialite database table

For my attribute table I created a custom form in qt designer. The table has a date field and a time field. In qt designer there are widgets for entering date and time. But what data type is expected ...
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17 views

QGIS 2.2 - Opening ArcPad *.tif.aux *.tif.sdw *.tif.sid

I use QGIS 2.2 with Ubuntu Linux and with Windows 7. Under Win7 I can open the ArcPad data without problems. The browser find it and I can add this data in a layer. Under Ubuntu the browser cannot ...
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18 views

How to intersect more than 2 layers in QGIS

I have a dozen layers, some intersecting with others. Using the Intersect tool only allows 2 layers at a time but can you add extra layers to find where it intersects? Even if it's 3 layers as shown ...
2
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1answer
52 views

Problem installing QGIS Valmeira on Windows 7 Professional 64-bit

I have been having trouble installing QGIS Valmeira on Windows 7 Professional with SP1. When I installed to the default directory C:\Program Files\QGIS Valmiera\, many of the predefined coordinate ...