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

learn more… | top users | synonyms (1)

2
votes
0answers
14 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
votes
1answer
26 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
30 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
vote
0answers
27 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
22 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
78 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
68 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 ...
3
votes
3answers
119 views

SAGA installation in QGIS 2.8 on debian 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. ...
0
votes
0answers
30 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
votes
0answers
22 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
28 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
66 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 ...
6
votes
2answers
189 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
vote
1answer
44 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
vote
2answers
42 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.
1
vote
1answer
35 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 ...
-1
votes
0answers
19 views

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

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..
1
vote
0answers
14 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
vote
1answer
42 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 ...
0
votes
0answers
22 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
vote
0answers
42 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
votes
1answer
28 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
vote
1answer
39 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
26 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
votes
0answers
30 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
52 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
31 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 ...
-6
votes
0answers
28 views

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

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 ...
0
votes
0answers
17 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 ...
0
votes
0answers
24 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
84 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
votes
0answers
13 views

How to execute the UI form [closed]

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 = ...
2
votes
1answer
49 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
vote
0answers
50 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 ...
1
vote
0answers
33 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
vote
0answers
57 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
vote
1answer
45 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
30 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
vote
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
70 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
43 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 ...
2
votes
2answers
43 views

QGIS exporting attributes in a KML file

Here is what I am doing: Create a layer by uploading a shape file into QGIS Select Attributes of that file Export selected attributes with the "save only selected features" check box when I save the ...
0
votes
1answer
33 views

Cannot rename output file using standalone script for QGIS

I would like to rename all output files after my script has finished processing them by adding "(A)" after their file name (eg. Layer.shp -> Layer (A).shp). I received an answer from this post on the ...
1
vote
1answer
32 views

QGIS Polygon overlaps on “Merge Shape file”

I am trying to merge two polygon shape file in QGIS 2.6.1. One is older one with all state boundary, which I have (.shp, .shx, .prj, .dbf). New one is downloaded from WEOGEO (.shp, .shx, .prj, ...
3
votes
1answer
58 views

QGIS 2.0.1 finding roads in one particular province

I have two shapefiles that I want to use to see all the roads in one particular province of The Netherlands. So I have one layer with all the roads in The Netherlands and one layer with the ...
1
vote
2answers
45 views

Transform from artificial coordinate system to a real one

I have spatial data generated in an Archaeological excavation which is in an artificial coordinate system and I want to convert it to a "real" coordinate system. To do this I took real coordinates ...
1
vote
0answers
18 views

QGIS - Label polygon with different projections

I have a polygon layer projected in an UTM. In properties I checked 'show all labels for this layer'. Does anyone know why the label does not show until zoom 15:1 in QGIS with CRS-4326, while in ...
1
vote
1answer
45 views

How to add label to QgsVectorLayer by Python

my goal is to define label programmaticly for the case similar for the figure below: But didn't find any guidance how to do so using Python. I have a feeling it could be done using QgsLabel but ...
1
vote
0answers
26 views

QGIS attributes disappeared when reopened shapefile

I'm a new QGIS user so sorry if this sounds lame. Working in QGIS, I've built a vector layer and added attributes. When I reopened the file this morning, the attributes won't show up in the ...