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

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12 views

Workaround for grouped layers to stay collapsed when opening project

Using QGIS 2.6.1 on Windows 7, whenever I open a project containing layers in various groups, they appear expanded. This is regardless if the project is saved when the layers are collapsed. I'm ...
2
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2answers
52 views

How to convert a vector map to raster in Qgis?

I am creating a thematic map (vector data) with different classes. How to convert this vector map to a raster map, keeping the classification?
-4
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0answers
19 views

error while trying to compile quantum gis: unresolved external symbol class QwtIntervalData [on hold]

While trying to build qgis-2.6.1 from source on windows 7 32 bit with mvc++ 2008 I got the overall result ========== Rebuild All: 281 succeeded, 3 failed, 0 skipped ========== from this I am able to ...
3
votes
1answer
37 views

Can QGIS 2.8 load WMTS layers?

I'm having a bit of an issue loading a WMTS into QGIS 2.8. The application can connect to the WMTS, correctly identify the layers that are available and load the layer into the layer pane. However, ...
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0answers
18 views

Error when creating a new mapset with GRASS in QGIS

When I try to create a New Mapset with the GRASS plugin in QGIS I get an error or the program crashes. QGIS 2.6.1 (32-bit install, Win7). QGIS crashes completely when clicking "Finish" in the New ...
1
vote
1answer
16 views

Rotation matrix in the EPSG

I use Proj4j for a WebGIS and I have to create a new ESPG. I tried on QGIS to convert coordinates from a local system (in Greece) to a world coordinates system. First, I have to do a 2D ...
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0answers
20 views

How to get rid of lines within merged poligons?

Sometimes, when I merge polygons there are still some lines showing within them (see screenshot). How can I get rid of them?
2
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0answers
11 views

Identify tool and highlighting behaviour in QGIS 2.6

I have a problem with the identify tool in QGIS 2.6. Somehow the object highlighting doesn't go off when i click on another object with the identify tool in QGIS. In earlier versions, when you ...
2
votes
0answers
7 views

Extract from a linestring layer, groups of linestrings to a multilinestring objects layer

I've got a linestring layer with thousands of linestrings. I want to extract groups of linestrings to individual multilinestring objects. In the following picture you can see a part of the layer ...
0
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1answer
21 views

QGIS and arcmap compatibility in image georeferencing

I have georeferenced an image in QGIS but when I imported it to arcmap 10.0 it saying "In consistent extent". Any one know how to solve it?
1
vote
1answer
19 views

Current field of view specific legends in QGIS

Is it possible to make QGIS generate a legend that is based only on the field visible in composer? There was a ticket marked as resolved 5months ago with this question but it doesnt divulge the ...
1
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0answers
24 views

Worldfile incorrect? Puzzler: all resources supplied!

Trying to manually create a worldfile for gif images of surface currents supplied by the navy here. I have QGIS and am decent at using it but the world file tool is failing without error on me (even ...
2
votes
1answer
17 views

QGIS Merged Layers/ Cannot Find Windows “minidump” to Restore Past version off Dropbox

I've copied a layer style and was playing around with the display of a point layer when QGIS Valmiera 2.2 crashed. A recently-created polygon layers attributes are now appearing in the place of ...
1
vote
1answer
58 views

Unable to change the fonts of the legend in QGIS 2.8

I'm running QGIS 2.8.0-Wien on my Ubuntu box and came across odd behaviour of print composer. When adding a legend - I'm unable to change the font size of the title and items. Bizarrely - in the ...
4
votes
1answer
43 views

Measuring Sinuosity of Walking Paths

I'm currently working on a project that examines the movement of consumers through different kinds of retail spaces in Central Asia – namely, bazaars versus supermarkets. I've equipped dozens of ...
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0answers
40 views

SAGA installation in QGIS 2.8 linux

I install QGIS 2.8 in debian (linux) through nightly jessie (qgis testing) and I see that SAGA is not in processing toolbox, so I install saga gis software but still it doesn't appear in processing. ...
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0answers
26 views

Layout points along a line at varying distances

I am new to QGIS, and have some minor experience with ArcGIS. I am trying to lay out sewer taps (connections) along existing sewer main lines in QGIS, from old construction notebooks. The lines run ...
2
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0answers
21 views

How to create a syntesis map ( eg. climatic vulnerability) in Qgis [duplicate]

My final goal is to create a synthesis map of climatic vulnerabilities composed by different thematic variable with different weights. I would like to ask for support for the following issues: For ...
1
vote
1answer
13 views

Error adding MrSID raster layer to QGIS for Mac OS X 10.10.2 (Yosemite)

I want to add a MrSID layer to QGIS (version 2.6.1) with a computer running Mac OS X Yosemite. I installed QGIS through macports from the terminal and all python packages through macports, as well. I ...
4
votes
1answer
46 views

How to calculate “water accumulated in each cell” using QGis?

I create channel network and catchment area from a DEM with SAGA GIS. I know that flow is starting from a cell to an other cell. Firstly, a cell is filled with water and then it is starting to flow ...
5
votes
2answers
143 views

How to make a bivariate colour ramp with QGIS, R or similar?

Many recent maps I have seen have these neat two-way color gradients that can be used to color correlations between continuous estimates. Here is an example taken from a recent publication (Source: ...
1
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1answer
42 views

How to get a layer by name in PyQGIS?

I have a plugin which finds buffer for list of cities, provided the distance. The state and city names are taken from the attribute table and gets filtered accordingly. What I want is My plugin should ...
1
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2answers
34 views

Representation of precipitation data

I have an excel sheet of precipitation data of each month of some districts. I have also the shapefiles of these districts. How can I represent this data in these shapefiles.
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0answers
22 views

QGIS change raster tiles properties at once

I have a set of several raster tiles and I need to change the properties of each one, by setting up a transparency for instance. I have found no other solution but changing properties of each one at a ...
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0answers
14 views

How to edit the Oracle Versioned Tables in QGIS? [on hold]

I Have Created a Version for one Table in Oracle Spatial, when i tried to edit and Attbributes in QGIS i am not able to save..
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0answers
12 views

Is it possible to enter start/stop points non-interactively in Road Graph plugin?

I need to find the shortest paths in a network of roads for many pairs of start/stop points. The Road Graph plugin in qgis allows me to interactively select a starting and ending point on a map, but ...
1
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1answer
35 views

QGIS moving the layer/all features using Vector Affine Transformation

I'm using QGIS to analyse some flight tracks which were produced using a different software. Now when they are on QGIS the reference point of everything is on 0,0 which is the aerodrome reference ...
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0answers
18 views

viewshed analysis QGIS

I'm trying to make a viewshed complemented Quamtun viewshed analysis in GIS, someone managed to do it? in my case not allow me to finish the process skips a misconception among other things tells me ...
1
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0answers
34 views

Representation of road networks at junctions when line width is varying with attribute

I have a road network and for every road segment the average number of daily traffic. I need to draw a map where the line width for each road segment is proportional to the daily traffic. I can do ...
0
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1answer
18 views

ImportError: libqgis_core.so.2.9.0: cannot open shared object file: No such file or directory

I installed qgis in debian linux and I want to run a standalone app in python. So I import qgis.core and qgis.gui in this app. But it gives me an error: ImportError: libqgis_core.so.2.9.0: cannot ...
1
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1answer
32 views

How to create Spatial Reference System in QGIS?

I have some Attribute and the coordinate and the coordinate reference system. I want to create a DBmanagamet form my spatial data. To do that I want to create one table with name Spa_ref_sys, but I ...
1
vote
1answer
17 views

setting SAGA folder for QGIS with OS X macports install

I am trying to get the toolbox to work in QGIS 2.6, but I keep getting an error message that SAGA is not properly configured. After much digging, I finally found I can set the SAGA folder in ...
0
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0answers
28 views

How to decide when flood started depending on the rainfall data?

I created a raster with the point values (mm) of rainfall data by interpolation in the raster menu. So I have a raster rainfall data and a DEM. With this rainfall data and a DEM corresponding to ...
1
vote
1answer
48 views

How to use attribute data for legend labeling?

For features in a map it is possible to stuck data from the attribute table together and get a data driven label. I try to do this for my legend labels. I want to combine values from my attribute ...
0
votes
1answer
21 views

How to cut a raster into smaller, equal area parts?

I have a large raster file that I need to cut into smaller parts. I already have a polygon shapefile that has the smaller parts that I want to use as an index. The reason for this is that end users ...
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0answers
28 views

Where are resources about QGIS architecture and module connections? [on hold]

I am studying how a GIS platform works on a corporate level. I need a thorough explanation and supporting documents about how QGIS operates and is implemented. Although it is open source, it doesn't ...
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0answers
15 views

How to manually apply permanent ArcGis Stretch images filters out of box?

I usually use Arcgis image stretch filters for my images to make them sharpen or to highlight certain elements of a raster like this: Version without filters: Version with filter: How can i apply ...
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0answers
22 views

“No-break space” for labels

My map has labels, which usually should break after the 14th character using "wordwrap": wordwrap(name,14) But sometimes I need to suppress the wraping. So I need to use a "No-break space" - is ...
2
votes
1answer
75 views

How to place labels on multi-geometries in QGIS?

I need to put a label value on each geometry, so I do not need to locate the label on the (or near to) centroid. I use QGIS 2.6 on windows 7 Most ot the records has only one geometry linked to, but ...
1
vote
1answer
72 views

Qgis 2.8 problem with font size

I'm using Debian 7 and yesterday i had an update of Qgis 2.8. Since then I can't change font size and type, at labeling and print composer, whatever i pick it returns to the default "Free sans" size ...
0
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0answers
12 views

How to execute the UI form [on hold]

I have developed a UIForm programmatically. When i am executing the application i am getting the following error: app = QApplication(sys.argv) Widget = QWidget() layout = QVBoxLayout() label = ...
1
vote
0answers
25 views

PyQGIS load dxf file as a vector layer

Can somebody help me with loading a dxf file as a vector layer with PyQGIS? Is QgsDataSourceURI an option? I've tried it with this code, but it didn't work. fitxer="/tmp/prova.dxf" uri = ...
1
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0answers
48 views

Trying to split a complex shapefile by australian states

Im trying to work with a 1:1 mill scale shapefile of the geology of Australia. When the whole lot is loaded in to QGIS (over 200,000 polygons) it will freeze and go to slow to work with. Ideally i ...
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0answers
29 views

Create Thiessen polygons using spatially weighted averages?

I have to create Thiessen polygons with the spatially weighted averages for specific contaminate concentrations from different borings. I have the Thiessen polygons created but this only shows me the ...
1
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0answers
52 views

Upgrade qgis in debian jessie (linux)

I want to upgrade qgis 2.6 to qgis 2.8 in linux (debian jessie). I did: sudo apt-get update sudo aptitude full-upgrade And I get this error: Até aqui tudo bem... Processing triggers for ...
1
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1answer
37 views

How to start QGIS 2.6.1 after install on windows XP home?

New to QGIS and installed 2.6.1 on Windows XP desktop home edition. No errors received during install. When I launch QGIS Brighton from Start - Programs the qgis-bin.exe - Entry Point Not Found pops ...
1
vote
1answer
29 views

Editing POSTGIS tables via QGIS

Is it possible to edit POSTGIS tables directly in QGIS 2.6.1. I've been using The DB MANAGER but can only really do DDL type edits....Or create/import a brand new layer. I did see a SQL Window but ...
1
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0answers
17 views

Vector Layer Symbology Export?

When programmatically creating / saving a QgsVectorLayer - implementation of the ExportSymbology functionality does not seem to exhibit the implied effects. Does such a command not indicate that the ...
1
vote
2answers
47 views

Can QGIS 2.6.1 export to mapserver?

I would know if there's a way to export qgis data to mapserver (Mapfile). In previous version of Qgis there was a plugin called "Export to Mapserver", now I can't find anything...
2
votes
0answers
38 views

How to create a legend for quantitative visualization with increasing icon size?

I am trying to find a way to do a map and legend like this: I am using QGIS 2.6 Brighton. The only way was to do a pie chart but I think it's not possible to create classes. I can create circles ...