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

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1answer
78 views

QGIS raster from interpolation not scaled correctly

I am using the interpolation plugin in QGIS to interpolate values within a boundary. I start with two layers; 1) my points and 2) a polygon for the area of interest. Then I go to ...
2
votes
1answer
271 views

How to add attributes to a Shapefile published in Geoserver?

I use Geoserver 2.4.4 with Shapefiles. Now, I want to add attributes to features from a layer that already has some attributes. (Shown in Geoserver->Layers->Feature Type Details). I add the ...
2
votes
1answer
635 views

QGIS calculate the 3d surface area of a region

I would like to calculate the true surface area of a region from DEM (2d elevation data). Is it possible to do this with QGIS? And if yes, how? I managed to obtain a 3d vizualization of the elevation ...
2
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2answers
267 views

What is the “best” way to automate the GIS slope and aspect algorithm?

I am currently obtaining slope and aspect of roofs using ArcGIS as follows: Mosaic several Lidar .asc files to new raster Extract by mask using Mastermap building outlines to get hold of just the ...
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1answer
20 views

QGIS 2.6 properties per plugin

How can i set a projectproperty with a python plugin? I like to activate the legendfilter for Nodes with existing feature.
1
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1answer
30 views

Previewing data type of vector layers in QGIS Browser?

One of the features I really like about ArcGIS is that in the Catalog pane, it will show you what vector data type (whether it be point, line, or polygon) a layer is in the little icon, which is quite ...
1
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1answer
162 views

Can a SD file format be opened in QGIS?

I downliaded a SD file from here: http://portal.emodnet-hydrography.eu/geographic-grid How can I open it in QGIS?
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0answers
73 views

Is there a list of Open Source tool alternatives for ArcGIS tools? [duplicate]

Is there any place one can find a list of ArcGIS alternative or near-alternative tools found in (any of) the open source softwares? I am not looking for software but individual tools found in the ...
1
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1answer
2k views

ImportError: no module named site

I am developing a standalone app using qgis librarys and run the python inside qgis. I import the librarys with no errors but I have one last error: ImportError: no module named site. I define the ...
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0answers
119 views

How to import ERDAS ECW in QGIS 2.6 using GDAL 1.11? [duplicate]

I am using Lubuntu 14.10, QGIS 2.6, and Ubuntu GIS(unstable). QGIS was used to use GDAL 1.10, and can import ERDAS ecw format. But after GDAL upgraded to 1.11, QGIS couldn't import ecw images. How to ...
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0answers
52 views

Given distance (in meters) what is the angle in geographic reference systems? [duplicate]

In QGIS and other systems sometimes I have a layer in geographic reference system (typically WGS84, EPSG:4326) and I'd like to calculate a buffer of say 5000m around a point. So, given a point ...
1
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1answer
48 views

No expected output when accessing variable from one function and using in another fucntion

I have a function say selectedfeatures this function would be called when a selection changed event happens in mapcanvas. self.canvas.selectionChanged.connect(self.selectedfeatures) ...
2
votes
1answer
223 views

How to create desktop shortcut for QGIS?

I installed QGIS version 2.8.1-Wien on Win 8.1 but there is no start or desktop icon to run QGIS. I can only execute using OSGeo4Shell which give me a command com line and I type in qgis to run. How ...
1
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1answer
35 views

Move features to different geographic area

I want to move a dataset of a few thousand vectors to a different geographic area. However I can't seem to find any tools to do this, or I'm not sure on the terminology for what to look up. I suppose ...
1
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0answers
30 views

Problem with QGIS Heatmap Plugin [duplicate]

I am experiencing some issues with the Heatmap Plugin (0.2) on QGIS 2.8.1, and I wanted to double-check if I am doing something wrong, or if there is some sort of bug lying around. As a background, I ...
2
votes
2answers
522 views

How to convert negative field values to positive?

I have an xyz file that I want to convert negative field values in the z column to positive values. How do I do this with field calculator?
2
votes
1answer
326 views

How to define an event for features selected in mapcanvas in qgis using python

I have created a push button, when it is clicked it calls the function 'selectfeatures'. This function will call the Select feature by free hand tool of QGIS and allows the user to select features in ...
-1
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2answers
190 views

Displaying XY coordinates from csv file

I have a csv file which I created from a SQLite3 database. I want to display the points from the csv in QGis - which does not work. My coordinates are Lat/Long. They get displayed completely wrong. ...
1
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1answer
1k views

Setting PythonPath

I have a question which might be a little bit odd, but I want to make sure I get that right.... I want to use this script here Ortho Projection produces artifacts (unfortunatley I cannot download the ...
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0answers
165 views

Kartograph - converted svg not the same as before

I'm using the following script to convert a map from NaturalEarthData. But the result is very sobering. It seems like something went wrong with the scaling, but I got no errors when executing the ...
0
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0answers
116 views

apply gdal to calculate raster that is already in qgis raster calculator

I am using the following code in qgis to calculate some raster.It is not giving the correct result as it is in arcpy.I want to apply same in gdal.Can anyone help me how to use the gdal api.Please give ...
0
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1answer
60 views

Import CSV to QGIS with z-values in column 4

I would like to import CSV into QGIS, but the z-values are listed in column 4. I didn't find out how I could specify that the values are not in column 3 but in column 4. Edit: Added a screenshot
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1answer
85 views

how to calculate area of a polygon in a shape file in qgis [duplicate]

I want to calculate areas of different polygons in qgis in tabular format.
3
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0answers
243 views

qgis 2.8.1 - processing gdal 1.11.2 error (mac, 10.10.2)

i've just recently installed qgis 2.8.1 on my mac. including all relevant packages from kyngchaos - i.e. GDAL Complete 1.11 framework package, Matplotlib Python module, numpy - and updated python to ...
4
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1answer
198 views

open project made on OSX lion on a windows computer with QGIS

I made a project in my personal computer (mac OS Xlion) and now I would like to modify it on my work computer (windows 7), Is it possible?
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2answers
549 views

How to replace VectorWriter with QgsVectorFileWriter?

Within QGIS 2.8.1 I found within the Processing Toolbox a script called "Points on crossing lines" which should exactly as it is named. Unfortunately it needs processing.core.VectorWriter which I ...
3
votes
1answer
155 views

Is it possible to add a raster file as layer from an URL?

I have several geoTIFFs stored on a server that I can access through http. I would like to add them as raster layers analogous to adding a local raster file through the "Add Raster Layer" button, but ...
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0answers
433 views

Half-SOLVED : compilation of QGIS 2.8 against GRASS 7 from source with centos6.5

Not very clear how to set variables with ccmake in the QGIS project 2.8.1, but now I learn that library paths need to be complete, i.e. : Not : -DSPATIALITE_LIBRARY:string=/usr/local/lib But : ...
3
votes
0answers
137 views

QGIS 2.8 PrintComposer, no coordinates shown

I tested under MacOS 10.10.3 and 10.9.5 now: In the QGIS v2.8 Print Composer I don´t get coordinates shown when I want to create a map sheet and activate "Draw coordinates". I can do all settings ...
1
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1answer
91 views

Order by column is sorting String like though it is an Integer column

The question is very easy. The usual sorting of an Integer column is really bad. I need it like 1,2,3...11,12 and so on. But currently it's more like 1,10,11...2,20... Here a picture Is there an ...
1
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2answers
555 views

Clip tool does not work Qgis [closed]

Is there any particular reason why I cannot clip in QGIS (2.8)? I have a Vectorgrid which I created based on another shape - namely a country. Now I want to clip the vectorgrid to the size of the ...
4
votes
1answer
330 views

Need to Quickly Add Multiple Layers From Multiple Folders To QGIS Project

I have downloaded several imagery Zip files (content of each is jp2, jpg, jpw, xml, htm, and .dbf, .prj, .sbn, .sbx, .shp, .shx) and would like to quickly add this imagery to my working project in ...
4
votes
6answers
2k views

QGIS plugin: Problems importing resources (resources_rc) file - plugin doasn't load - PATH problems?

I'm building qgis plugin and I can't find solution for this error. File "/usr/lib/python2.7/dist-packages/qgis/utils.py", line 478, in _import mod = _builtin_import(name, globals, locals, ...
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0answers
55 views

QGIS plugin : connect to polygonselect Maptool signals

Working on a new plugin I am trying to connect a custom function to the mouse right-clic signal while using the polygon selecting maptool. I have activated the maptool through : def run(self): ...
1
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1answer
330 views

How to change the attribute length of an existing field afterwards

I already have about 100 values in a field in QGIS. I set it to 50 characters because I was thinking that would be enough. But that was wrong. I need more space in the column. But there is no way to ...
2
votes
1answer
265 views

Downloading data sets during installation

I can successfully install QGIS 2.8.1 on a Windows 7 machine but I get an error when downloading the Carlina, South Dakota and Alska data sets. The error message is http/1.0 504 Gateway Timeout. Looks ...
1
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1answer
84 views

QGis 2.8.1 Series of maps from different layers

I have many layers in one QGis-Projekt based on the same .shp-File (Community borders) with different fields classified and displayed in each layer (Mean Income, Mean Age, Average Houshold Size ...). ...
2
votes
1answer
68 views

Is there Data Loader for QGIS or Spatialite?

Is there a tool that works like the data loader of ArcGIS for QGIS (or via Spatialite )? To integrate data in a database or a shapefile without having the same structure (and the tool allows to ...
1
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1answer
120 views

Setting Scale Dependent Visibility for WMS in PyQGIS

This code imports 'MiniScale' mapping from my WMS miniScale = ...
0
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1answer
114 views

unable to print correctly QGIS maps [duplicate]

I already ask how to print a map without screwing the "sync" between my map and the Openlayers background. I have tried 2.6.0 and 2.8.1 versions getting only deep frustration. I have used the scale ...
2
votes
1answer
110 views

Re-projecting point data using ArcMap

I've created a point data layer in QGIS using a .png image as a template. Of course the .png had no projection, and when creating the new shapefile I chose the WGS_84 coordinate system. Now, I need ...
4
votes
2answers
2k views

Install QGIS Server and Web Client under Ubuntu 14.04

I tried to install QGIS Server and QGIS Web Client on my Ubuntu machine by following this tutorial http://www.aboutgis.ro/blog/wp-content/uploads/2013/04/qgis_desk_web_server_client_tutorial.pdf. At ...
1
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1answer
162 views

How to add a lat/lon grid to a map using azimuthal projection?

I have a north azimuthal projection, equal areas. I want to create a map from it (in QGIS) and display a grid on it for better orientation. Thats how it looks like: Why doe my degrees have so ...
1
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2answers
101 views

Merging raster data in QGIS using wildcards

I have a problem merging raster data sets in QGIS, and I have searched various forums, but have not found a solution yet. An "ordinary" merge, for example merging the raster files ...
1
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3answers
254 views

QGIS 2.8 Wien - dll pyodbc not found

I just installed QGIS Wien 2.8.1, first the OSGEO4W Installer and later the standalone installer (32bits) and when I write import pyodbc on the Python console I get a message that the dll was not ...
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0answers
370 views

Need to connect ArcSDE dataset using QGIS Desktop and Oracle database

I am working in GIS domain using ESRI technology. I want to use QGIS desktop to access ArcSDE dataset from a local machine. I have already installed Oracle Client 10g and QGIS Desktop 2.8.1 through ...
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1answer
44 views

How do I create an atlas with multiple maps for each coverage layer with QGIS?

I am doing a NSW transport map that would like to segregate using Local Government Areas (LGAs). However, I specified that each map should be in the same scale, hence I would like to have many ...
1
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1answer
195 views

QGIS georeferencer: Thin Plate Spline (TPS) residual

1) Is anyone able to explain in simple manner what does mean error exactly mean? I use metric values, so suppose 3.64109 is expression of meters and "e" is mathematical constant: ...
2
votes
1answer
111 views

How to get the average of a column?

So I have a shapefile with 160k elements. It is in UTM and I calculated the area (should be meters, right?). What I need now is the average size of each of my polygons. Meaning, summing up a column ...
1
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0answers
122 views

QGIS, GRASS and WINDOWS 8

Good morning, I'm using QGIS 2.8.1 (Wien) on Windows 8 x64 bit. When I'm trying to lunch the GRASS plugin (6.4.3), Windows shows me the error g.mapset.exe has stop working, then after some times, ...