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

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136 views

Problem installing QGIS on Mavericks. Says I need 10.6.8

Trying to install QGIS for first time on a Mac OS X 10.9 (Mavericks). Loaded up all the prerequisites (GDAL, etc.) but the QGIS installer tells me "QGIS requires Mac OS X 10.6.8.". Saw that QGIS is ...
2
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2answers
129 views

How to translate (reposition) a .tif raster layer?

I'm starting to use QGIS for my thesis (environmental physics) and have to admit I'm pretty ignorant about it - I've always used Mathematica or Matlab. My problem is: I have a raster layer, in .tif ...
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1answer
374 views

Select polygons by attribute belonging to another layer

I'm a recent QGIS user. I have a shapefile A with a series of polygons indicating land use of an urban region (urbanised areas). Now I want to select them in relation to a second shapefile B with the ...
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2answers
378 views

Import Esri/ArcGIS .e00 files to QGIS on Linux (getting error message)?

I can't seem to import Esri .e00 files into QGIS, and I can't figure out why. I'm trying to import files I've downloaded from ...
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0answers
64 views

Loading QGIS and files from Python's use of os.system?

I am trying to open QGIS and load two files using the following code in Python: os.system('qgis D:\data\vector.shp D:\data\raster.tif') However it returns this error message: 'qgis' is not ...
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2answers
106 views

Python Error in QGIS Ubuntu 13.10 while trying to join .csv tables

Using the mqgis plugging in QGIS I cant join my csv file... This is what QGIS returns me: An error has occured while executing Python code: Traceback (most recent call last): File ...
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1answer
113 views

Clip raster with shapefile

I want to clipping raster (Lidar) with shapefile in qgis ver.2.0.1. Which plugin in qgis could I use it ? Thanks for help me.
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145 views

Google Maps basemap not showing up when KML file added as a vector layer in QGIS - only point markers appear

I am trying to make a basic XYZ contour plot in QGIS 1.8.0 (longitude, latitude, depth in an excel file) and can't get past the first step of adding a basemap in QGIS. I've tried using the Open ...
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0answers
123 views

Invert axis orientation in QGIS

I'm loading two WMS layers served from GeoServer with declared srs EPSG:4326 in QGIS 2.0 in EPSG:4326. The two layers displays correctly when I zoom in to Sweden. If I display the two layers in ...
4
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1answer
812 views

How to set up a Web Map Service with QGIS?

I am very new to QGIS environment.I wanted to work with creating Web Map Service using QGIS server.Does it possible to create Web Map Service in QGIS sever? can anybody help me with resource link and ...
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1answer
49 views

When I save a project to a folder, I get this error message

I opened QGIS, started a new project, and loaded rasters. Then I saved the project to a folder I had already created. I got the following error message. The same exact message appeared when I closed ...
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1answer
43 views

Rough edges on tiles in QGIS

I'm loading four .ASC files into QGIS, each containing topographical data about a tile of 10 x 10 km. On the map, this data is displayed as black/white and different shades of gray. My problem is that ...
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1answer
121 views

Retrieving lost data from QGIS

I'm trying to help a friend retrieving QGIS data from a formatted drive. Finding the .qgs project that was saved on the desktop is no problem, but it seems that there is no actual data located in ...
2
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0answers
157 views

How to use buffer() in QGIS Value Relation field

When adding a point, I'd like to auto-populate one of its fields (the street address) setting it to a field in the nearest point in another layer (a layer containing all existing addresses). It ...
1
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1answer
144 views

Trying to set NAD 1983 EPSG 102631 in QGIS

I was able to find the right coordinate system online NAD 1983 Alaska But now I don't know what to do. I can't find the coordinate system on QGIS. When I choose the one I think is correct it warps ...
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0answers
148 views

How to improve creating contours for super-high unnatural mountains?

in a current project I am working on we are not mapping the actual height of a landscape rather mapping the interest which specific stakeholders have in parts of the region. So, what we did was the ...
3
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1answer
313 views

How do you export to georeferenced PDF from QGIS 2.0?

When I use the print composer in QGIS, there is no option to export to georeferenced PDF using GDAL. Do I need to export from somewhere else or how do I go about exporting to georeferenced PDF? I am ...
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3answers
3k views

3D visualisation with open source GIS software [closed]

I'm searching for QGIS (or other open source GIS software) tools that can analyse XYZ data. Also I'm interested to hear about if anyone have migrated to non commercial software regarding geological ...
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0answers
33 views

qgis python plugin enabling other plugins

maybe it is a stupid question but i am new in qgis. I developed some python plugins and they work correctly, now what i would like to do is to install a "door" plugin that after asked ...
5
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1answer
2k views

QGIS and SQL Server Spatial Tables Performance

I'm trying to get a SQL Server 2008 R2 spatial database up and running to streamline the production of maps using QGIS. Currently I just have a handful of spatial tables (a postcode level point table ...
2
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0answers
168 views

QGIS: How to reverse vertex ordering in polygons

I am working with an Oracle spatial connection in QGIS through which I am accessing and editing a vector layer. I find that when I edit a geometry, the vertex ordering is reversed (to clockwise in the ...
4
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1answer
248 views

How to find a single point furthest from any road?

I have a road layer of a country. What method or plugin would you suggest, to find a single point furthest from any road (but as you can see, there is a coastline, so points in the sea can't count) ...
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1answer
272 views

How to add the current document path on Print Composer?

I'm trying to demonstrate to my company that we can begin using QGIS in conjunction with (and sometimes even instead of) ArcGIS and MapInfo. I've started setting up some layout templates but have run ...
2
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1answer
192 views

How to synchronize the marker's rotation field with the angular distortion in the map projection

I'm Using QGIS 1.8.0 to plot a global dataset showing the positions of aircraft in flight. The data I have are .csv files with three columns: Latitude, Longitude, and angle of travel. I assign ...
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2answers
52 views

Change precision of Real column

I have a sqllite table which has columns to hold the hectares and acres of polygons but I only want to have two digits after the decimal point - when calculated they have 14! How do I change this so ...
2
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1answer
360 views

Thematic map with points QGIS

I would like know how can I make a thematic map (soybean production) with density points. In this case the points are randomly plotted in a municipality area. Please, see an example in the image:
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1answer
1k views

How to resolve Geoserver ERROR: Operation on two geometries with different SRIDs

I am working on Geoserver Version 2.4.2 . I have one layer 'beat' in postgresql database. I have publish layer in geoserver but its not opening OpenLayers layer preview link. It gives error as ...
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0answers
53 views

Why legendLayerActions is not available in QgsLegendInterface

There's a reason why QgsLegendInterface (the python interface to QgsLegend) doesn't expose: QList< LegendLayerAction > QgsLegend::legendLayerActions( QgsMapLayer::LayerType type ) const method? ...
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2answers
724 views

How to clip an Openlayers OSM Background to a Vector Boundary?

I'm new to QGIS. In my project i have two layers: one is my vector (city boundaries) and the other is the OSM (obtained with the plugin). How can I cut the OSM along the edges of the vector? I want to ...
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1answer
475 views

QGIS hillshade error “GDAL provider: Cannot open GDAL dataset ”

I am using a DEM and using menu Raster > Terrain analysis > Hillshade. When I type a simple output file name "MyHillshade" and then click "OK", I get a two-part error message that says: "GDAL ...
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1answer
112 views

Which File to load from National Hydrography Dataset?

Start-over beginner here. I'm using QGIS 2.0 on MacBook with OS X 10.8.5. I downloaded a National Hydrography Database file. Unzipped, it is titled NHD11032_NM.gdb. I try to add the layer as a vector ...
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0answers
94 views

How to run PostgreSQL stored procedures from QGIS? [closed]

I'm trying to figure out if it's possible to run a stored procedure in a Postgres database from QGIS, more specifically I would like to do this from within a python plugin. In this case I'm trying to ...
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2answers
691 views

How can I create a merged buffer in QGIS then count points that fall within it

I have a QGIS plan which shows ponds (as points in a shape file with an OS tile as a background) within a survey area. I need to calculate the total number of ponds within 1 km of each of the on-site ...
2
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2answers
309 views

How to use ggplot with Processing in QGIS 2.0?

I'm trying to use R scripts within QGIS thanks to Processing. There are some example scripts available and I achieved to plots different columns of the attribute table (with the plot built-in ...
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0answers
106 views

Can I simplify polygons in QGIS by Size?

Just wondering if it's possible in QGIS to simplify polygons based on size? I've done it many times using the tolerance level to reduce the overall size however in this case each polygon cannot be ...
0
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1answer
75 views

Raster to Surface

I have a raster and I have been asked to modify some pixel values in it. Is there an open source way to do this? I would guess that I have to create a 3d surface, then manipulate the surface, then ...
3
votes
1answer
550 views

How to build a confusion matrix for image classification using SAGA or QGIS?

I did a supervised classification of a Landsat image subset using my training data polygons. I used SAGA GIS for that and everything worked out fine. Now I am stuck since I have no clue how to ...
2
votes
3answers
209 views

Generating a polygon tile index from multiple vector datasets

OK. well this is silly, in that there is no way it should be as difficult as it has been for me to find information regarding how to generate a polygon tile index from multiple vector (contour) tiles. ...
0
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1answer
56 views

How can i create single feature fwith Combining Selected feature qgis?

I am trying to create a single Qgsfeature from the Combination of selected features in Pyqgis. Currently i create the feature using a loop over selected features and combine them 1 by 1. but this ...
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2answers
325 views

Is it possible to set a reference scale in QGIS?

It's a little tricky to pick label and feature styles (line thickness, colours, etc) in the map canvas because they don't reflect what I would see in my print composer which is at a different scale ...
2
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0answers
731 views

Kriging with SAGA and QGIS [duplicate]

I have the "processing" toolbox installed on QGIS2 and it would appear to give me access to the SAGA variogram tools and and kriging tools. What I am missing and what I can't find via Google either, ...
0
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0answers
328 views

RasterXSize from gdal Nonetype error

I have this code to create a raster file in python: fileInf = QFileInfo(userIntervals) baseNam = fileInf.baseName() rlay = QgsRasterLayer(userIntervals, baseNam) gdalRast = ...
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0answers
232 views

How Can i create a Vector layer from selected features qgis

In my qgis plugin i select dynamically features from a Vector layer. and currently i create a new layer from selection on combining all feature into a new feature: theField = QgsField self.theString ...
2
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0answers
73 views

Distribute QGis plugin which depends on certain Python packages

I developed a plugin for Qgis which depends on some Python packages. On Linux and Mac, this is not really a problem because I can easily install them with the system pip command. Windows is another ...
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2answers
201 views

Saving a gml layer does not change coordinates

I am trying to export a gml layer to geojson with lat/lng as the preferred coordinate system. So what I did was a 'save as' on the layer with selected CRS: 'IGNF: WGS84G'. Now I was hoping it ...
3
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3answers
226 views

Can Mapnik 2.2 and Qgis 2.0.1 be installed together?

I'm using LM15 (== Ubuntu 13.04 Raring) with the Launchpad repos for Qgis Unstable 2.0.1 and Mapnik 2.2.0. Quantum wants libgdal1h; Mapnik wants libgdal1. As soon as I install one, the other gets ...
2
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1answer
121 views

How to control road labels in Atlas QGIS 2.0?

I'm producing map books for our water assets. These books are taken out into the field by the workers so they can see where various 'things' are for the work they need to undertake. There are over 200 ...
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2answers
732 views

Calculate area covered by a particular raster layer within polygons in QGIS

I am trying to extract information on vegetation cover within a set radius of point locations (my sites). I have succeeded in creating a new vector layer of circles with a 5 km radius around my sites. ...
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2answers
93 views

How to convert small overlaping polygon features to inner ring in QGIS

I have a polygon vector layer with overlapping features (like below) and I would like to convert the features that are fully contained inside the bigger polygons (ie feature 2 and 4 below) into inner ...
3
votes
1answer
442 views

Upgrade QGIS from 1.8 Lisboa to 2.0?

I have QGIS 1.8 and I want to upgrade to 2.0 Dufour... Should I just download the file and launch the installation? Or first uninstall 1.8? Thank you! Lily