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

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2answers
113 views

Counting buffer overlap in QGIS

For my thesis I'm modeling the identification of recreation areas. Therefore, there has been a survey where people were asked to specify where they recreate. They had to indicate this place on a map ...
1
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2answers
110 views

Archaeological spatiotemporal map using QGIS TimeManager?

I have been trying to use TimeManager to make a spatiotemporal map of artefacts found on a archaeological site. My goal is to show if there is areas on the site wich concentrates artefacts having ...
3
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1answer
87 views

CRS not embedded by maptools in R

I'm using the maptools package in R to merge some data to a shapefile. When I open the original input shapefile in QGIS, QGIS automatically picks up on the CRS. When I open the output shapefile from ...
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0answers
43 views

How to display table with more than one image from postgis in mapserver?

I have 3 tif files in one postgis(2.1.5 ver.) raster table. ( load with raster2pgsql) And i have mapserver MapServer 6.1-dev. I need to display table from postgis in qgis via mapserver. P.S I trying ...
3
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1answer
214 views

Count intersections of lines with polygon

I got a dataset of streets, which are displayed as line segments. In another, independent dateset I have roundabouts as a point geometry. Starting from these datasets, I want to count the number of ...
2
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2answers
66 views

Is a multi-database select possible with DB Manager?

I have data in two locations: geometry data (with attributes) on a PostGIS server (read only) a geometryless table on a local SpatiaLite DB (read+write) I need to select features based on data ...
2
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0answers
136 views

AIS directly on QGIS

I'm looking to have AIS data ( Carbon + from True Heading) in real time on QGIS. From AIS I got the data as following: !AIVDM,1,1,,A,35?7p455h53k<LH>;dR`wbgoP000,0*7F After using a specific ...
2
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2answers
227 views

Writing PyQGIS Output to Shapefile

I'm trying to find the closest point on a line to another point as in this post. However when I try to write the result as a shapefile I get an error: TypeError: ...
1
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1answer
168 views

No cadastral maps in the UK. Solutions/alternatives for a methodology?

I need help reworking a methodology in the absence of cadastral data in the UK. The aim is to plot a range of businesses in a UK city on separate layers (according to business type) as polygon ...
2
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0answers
32 views

Nearest Neighbor Based on Network of Lines in QGIS [duplicate]

Is it possible to incorporate a network into the MMQGIS hub distance analysis? Essentially I have a point shapefile with zip code centroids and I'd like to determine the closest shipping hub (also ...
2
votes
1answer
219 views

getting strange “grid” artifacts when creating hillshades using gdaldem

I'm trying to create hillshades from Czech elevation data (Fundamental Base of Geographic Data of the Czech Republic (ZABAGED®) - altimetry - grid 10x10 m) - a demo files is available here: ...
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0answers
213 views

While loop in QGIS modeler

I am looking for a way in QGIS - preferably using the graphical modeler but console scripting will also do - to build a model that iterates through features of a given layer until a condition is met - ...
1
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0answers
114 views

Geotagging photos with Point Shape via Time Stamp

I have waypoints which I marked with a gps device - unfortunatelly no track/route. And I have photos which I took at the same day. Now I want to interpolate the points to line and use this line to ...
1
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1answer
73 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
254 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 ...
1
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1answer
575 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
255 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 ...
0
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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.
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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
152 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 ...
0
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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
210 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
32 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
479 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
308 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
votes
2answers
181 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
156 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 ...
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0answers
112 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
57 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
0
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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
239 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
votes
1answer
196 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?
1
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2answers
516 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
144 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 ...
0
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0answers
421 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
133 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
vote
1answer
87 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
vote
2answers
519 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 ...
3
votes
1answer
281 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
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5answers
1k 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
53 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
281 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
249 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
81 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 ...). ...