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

learn more… | top users | synonyms (1)

3
votes
1answer
120 views

Add more info in the attribute table after executing “Line intersection” in QGIS

I have executed the "Line intersection" tool on a road shapefile. This is under Vector > Analysis Tools > Line intersections. I get an output with attribute table having just two columns: type_1 ...
2
votes
1answer
951 views

How to use PyQGIS ( Python QGIS API ) to open/close Update Drawing Order checkbox in QGIS2's Layers (Legend Interface)

Thanks qgis 2, the Legend Interface (layers dockwidget) now has Update Drawing Order check box on right-click mouse context menu. I think this feature can let user temporally closes rendering, then ...
0
votes
1answer
82 views

How to view attribute information in shapefile using QGIS? [closed]

I have a polygon shapefile (*.shp) and want to view its attribute data. How can I do this using QGIS?
1
vote
0answers
220 views

Qgis web client search

I install Qgis web client on windows 7 and it's working fine! Now I wont to setup search feature! First I added line in Apache config file: -LoadModule wsgi_module modules/mod_wsgi.so In ...
1
vote
1answer
149 views

How to use overview map with atlas plugin in QGIS 2

I'm using atlas plugin to batch generate maps. I insert an overview map but it doesn't get updated over iteration and generation of maps.Is it possible? If it's not, is there any alternative?
3
votes
1answer
122 views

Is it possible to save frequently used expressions in QGIS?

Is there any way to save frequently used expressions in the selection or field calculator dialogs? Obviously I can cut and paste them into a file where I might save them, but I mean within the context ...
1
vote
1answer
851 views

Pseudo-Mercator projection with Decimal Degrees?

Hope this isn't a duplicate, did some searching but none seemed quite the same. Projection I want: WGS84/Pseudo-mercator. Selected. Looks Great. Canvas units I want: Decimal Degress. Selected. ...
3
votes
2answers
198 views

Expression to calculate and sort data from several layers into one layer

I am trying to develop an expression whereby one layer can add data from 2 other layers and then rank them, is this possible? I have also tried the problem with using just 1 layer but I cannot work ...
0
votes
1answer
219 views

How do I use wildcards to work around the GDAL character limit?

I am attempting to use the 'Merge' & 'Create VRT' tools in QGIS 2.0 on a folder with 3000+ raster tiles in. However whenever I try to perform this operation the following error appears: 'The ...
-1
votes
1answer
104 views

Automatic capture (Raster to Vector) [closed]

I would like to know the automatic process for Scanned hand drawn line Raster to vector conversion. Please can anyone help me.
1
vote
2answers
104 views

Qgis “Layers menu from project” plugin doesn't open files

Has anyone out there any experience with a plugin to Qgis called Layers menu from project? This plugin gives you fast access to layers that you specify in a Qgis-project file. It won't work on my ...
1
vote
4answers
1k views

How to install TauDEM to work with QGIS?

I'm having trouble setting up TauDEM to work in the processing tools of QGIS 2.0.1. I download TauDEM from here and select "TauDEM 5.2 Command Line Executables for 32 bit Windows PC". I extract them ...
0
votes
1answer
83 views

Creating quintiles in QGIS when the number of observations per row is variable

I have a list of 100s of schools (1 per row), and a variable column with the total students in each school. The number of total students in each school varies widely. I want to split the list of ...
11
votes
4answers
2k views

shp2kml license expired, looking for free solution

So I work for a small African non-profit. I do all the GIS and data work. Most of the layers I create, I convert to kml layers so my boss can then use them quickly and easily in Google Earth. But now ...
0
votes
1answer
197 views

Open multiple hyperlinks in one point directly from QGIS?

I have an enormous shapefile and each point has about twenty different attributes. About five of these twenty are hyperlinks- is there anyway to open these directly from selecting a point in QGIS? ...
1
vote
1answer
465 views

How to install the GDAL plugin for QGIS 2.0 on Linux Mint?

What do I need to access the GDAL plugin in QGIS 2.0? I've installed QGIS on my Linux Mint 16 64bit system, but can't access the GDAL Contour tool. The problem seems to lie with my package ...
0
votes
0answers
83 views

Slow processing with QGIS Raster Calculator- Size issue?

I am first trying to determine what size raster is too large for processing in QGIS. I have 2 raster datasets that are over a GIG a piece (both have ige files) and I need to see how they are ...
1
vote
0answers
165 views

How to create a spatial view when allowing multiple selection in qgis’s edit widget “value relation”?

I've a point layer in qgis and serveral non spatial tables in a spatialite database. In qgis the fields were filled using the edit widget "value relation" (multiple selection allowed for some fields). ...
0
votes
0answers
116 views

Step by step LCP Analysis QGIS 2.0

i'm relativley new to GIS and i want to do the following analyse: I have to points between which i would like to reconstruct an ancient road. It should fit the following criteria: 1. cross rivers ...
0
votes
1answer
843 views

How to extract geo data out of a polygon shape file into csv kwt [duplicate]

I have a polygon shape file that contains all the neighborhoods in the Netherlands. My aim is to export the neighborhoods and coordinates to csv file (KWT). Without success I tried (with QGIS) these ...
2
votes
1answer
199 views

Openlayer map not loading

Just another OpenLayers problem Plugin is installed correctly but when I add a layer I get following message. (CRS is on Pseudo mercator) Can anyone help me out? An error has occurred while ...
2
votes
1answer
222 views

How to use Python console under QGIS 2 with gdal module?

I am trying to move my plugin from QGIS 1.8 to QGIS2.0. However, the gdal module cannot use under QGIS2.0. I try to use Python console, typing: import gdal #it's OK gdal.GetDriverByName( ...
2
votes
0answers
134 views

QGIS 2.0 How to copy the color styling to a color column in a layer's attribute table

I have a polygon layer in QGIS that I have applied a random color style to each polygon. Under Layer Properties -> Style I selected a Categorized style and then generated a random color ramp. I added ...
0
votes
1answer
158 views

QGIS toolbox not functional on OSX

Has anybody had any luck getting the tools in the QGIS2 Toolbox to run? So far I have tried SAGA and TauDEM but both throw up errors. I eventually got TauDEM to produce something from the D8 tool by ...
4
votes
1answer
90 views

why must Qgis 2.0.1 Desktop access the internet when I start it?

and how do I stop it? I'm on dialup internet most of the time and I don't allow unnecessary internet traffic. This seems unnecessary. I can't see any good reason that Q must access the internet, but I ...
3
votes
1answer
97 views

QGIS 1.8 Layer Styles

I've added OS Landform Parorama information in to QGIS 1.8, i've like to use the OS Layer Styles that are freely downloadable ...
1
vote
1answer
94 views

Use field calculator in QGIS so get number of points in polygone and store it in attribute table

I have to layers, one point one polygon (with 6 areas) stored as shapefiles. Now I want to count the number of points in each area and write it into the attribute table of the polygons. A column ...
2
votes
2answers
535 views

How to Extract data from OSM within a polygon

Although I am a Openstreetmap's regular user for quite some time, I am pretty new to GIS, so I assume this is an easy question: I would like to know how can I extract data (Eg:all schools) from OSM ...
0
votes
1answer
133 views

OS X Python vs QGIS Python

I'm wondering why after I updated to Python 2.7.6 on my OS X 10.9 Mac, QGIS Python console says that it is still running the old 2.7.5 version. This is not affecting my work but I'm curious about why ...
1
vote
2answers
80 views

qgis polygon to coordinates

I have the ordnance survey postcode polygons, i can get the centre point on the postcode (Using polygon centroids) and all the corner coordinates (using extract nodes) Does anyone know how to export ...
0
votes
0answers
45 views

Should OGR2Layers plug-in respect layer transparency?

When I export a graduated style layer from QGIS Dufour to OpenLayers using the OGR2Layers plug-in and QGIS rendering the colors and categories come across correctly. However, the opacity in the HTML ...
2
votes
1answer
273 views

R or QGIS? Measuring elevation at points on DTM surface

Based on answers to this recent question I have been able to create natural looking digital terrain models using a combination of raster, rasterVis and rgl working on data held in ESRI ASCII grid ...
1
vote
1answer
75 views

Find single line strings in MultiLineStrings

I have a layer of line geometries in QGIS (version 2/Dufour) and want them all to be singlepart linestrings. However, some of them are multipart geometries (MultiLineStrings in a GeoJSON export). The ...
0
votes
1answer
54 views

generate subcatchment starting from a DTM [duplicate]

I would like to know if there is a plug-in in Quantum GIS, which can help me to generate subcatchments starting from a DTM. Thank you very much!!!
0
votes
1answer
26 views

How to suppress spaces in labels?

I want to label some lines. The labels has spaces like "label 1". I want to suppress all spaces so that the result is like "label2" without changing the attribute table. Is that possible?
2
votes
1answer
167 views

Raster topo map “collars” overlap

I am using QGIS 2.0. I have downloaded USGS 1:100,000 topographic maps which show adjacent areas. The topographic maps were digitized with the borders (I've seen them called "collars", I think) as ...
1
vote
1answer
113 views

Is it possible to rearrange the items in qgis layer context menu?

I'm referring to the menu I get when I right-click on a layer in the TOC. I'd like to move Properties to the top. I can't find anything in the customization dialog that seems to apply.
1
vote
1answer
70 views

qgis print composer: more then one “overviews” to show overlap of more then two maps

I have a map composition with 3 pages (maps). I would like to draw the overlapping on every map. So the first map is overlapping the second, and the second is overlapped by the first an the third. ...
2
votes
0answers
33 views

automatic snap line to line [duplicate]

I need to automaticly overlay/snap the red line (gps-track) exact on the lines of my roads-shape. Is that possible?
1
vote
1answer
28 views

labeling in qgis 2.0: if one letter in string is “X”

I have a shapefile and I want to label all shapes with a "B" or "A" in its name (string). All others should be ignored. Like: If [field] contains "B" draw label Im using qgis 2.0.
0
votes
1answer
66 views

check if the district belongs to the province

I'm building map viewer using d3js and data from WFS service. In Poland we have 3 levels of administrative divisions: province district community Using WFS service I can get exact boundaries of ...
2
votes
2answers
363 views

How do I create a polygon layer from multiple touching line segments in QGIS?

I'm trying to create a base map for a Maine Coastal area, and wanted to create a polygon layer of the land cover from the coastline in QGIS. Whether I created the coastline vector layer from the USGS ...
3
votes
1answer
85 views

What is QGIS equivalent of ArcGIS GetCount for use in Python script?

I have a number of layers in QGIS that I would like to select attributes on, and get the feature count for, within a Python script. In ArcGIS for Desktop I have been using SelectLayerByAttribute ...
2
votes
1answer
168 views

Why does writing large shapefiles crash QGIS?

I'm trying to write large shapefiles with QGIS 2.0 API, using Python, which crashes QGIS. The data is composed of simple two point lines and a data table of five columns. A thousand features or so ...
0
votes
0answers
35 views

Reducing field length [duplicate]

I have very limited experience with Qgis, and only a very modest amount of basic experience with Arcview and Arcmap so be gentle. I have a shapefile with a text field that has 8 characters in it. I ...
3
votes
1answer
95 views

Is it possible to split a polygon inside another one in QGIS simply?

I can split polygon if I put the points of start and end outside the boundaries. How can I do the same if I have a part that I want to split completely inside a polygon. In Arcgis I can do it if the ...
1
vote
0answers
218 views

Drawing a road network: offsetting overlapping lines (directed graph)

Say I have a road network defined by a table, indicating, for each arc, its ID, and its head and tail node. In other words, my network is defined as a directed graph. For example, we have two points, ...
3
votes
1answer
114 views

Field calculator uses wrong fields when working with joined data

I am having an issue in qgis table joins. i have a joined a csv file to a sqlite database and common id is used for join. the join is displays correctly in attribute table. the attributes in sqlite ...
4
votes
1answer
197 views

How to horizontally align irregularly shaped point symbol to vector layer in QGIS?

Fairly new to QGIS and searching a method to graphically align my point symbols in the direction of the vector. The symbol represents a water valve in an irregular shape in close proximity to a vector ...
4
votes
2answers
275 views

How can I find the difference between two times (hh:mm) in QGIS?

I have a shapefile of crime reports that includes the time a call was received and the time officers arrived on scene. I want to create response times from the difference in these two values. I know ...