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

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3
votes
1answer
601 views

How to style a layer from console?

I am new to the QGIS python console. I am trying to load a raster layer from the console, set the crs and a specific style from a qml file. layerPath = os.path.join(raster_dir,raster_name) fileInfo = ...
3
votes
1answer
201 views

Create new polygon layer based on areas of varying numbers of stacked polygons

I have several species range maps (as polygons) that overlap/stack. From this, I am trying to identify areas of highest biodiversity. Ideally, I'd like to create a new polygon layer, where 1 part is ...
2
votes
1answer
67 views

“Find by attribute” plugin error

This is the error message, when launching the plugin. I hope this is the right place, where to report this kind of message. Any help would be appriciated! An error has occured while executing ...
6
votes
2answers
814 views

Can QGIS preserve layers when exporting a PDF? [duplicate]

I saw this posted about a year ago (Can QGIS preserve layers when exporting to PDF?) but figured it was worth asking again -- is this possible? My usual workflow with ArcGIS is to export to AI then ...
3
votes
1answer
2k views

How do I clip/mask a satellite photo to a polygon?

Given a shapefile composed of contiguous polygons, I'd like to clip (or mask) regions of satellite photo to the polygon outlines, and export each resulting raster in medium resolution for further ...
1
vote
2answers
2k views

How do I open a shapefile in QGIS for upload to Garmin GPSmap 62?

I now have a polygon and have succesfully raised 25 random sample points and saved as a shape file. I have checked that GPS utility and the shape file are set at 27700 BNG but when I try and open the ...
1
vote
1answer
356 views

Rasterize difference between QGIS and FWTools

I am wanting to use FWTools to rasterize a large number of Shapefile polygons. I have used the Rasterize tool in QIS and it works great. But when I use the generated code in FWTools the process does ...
0
votes
1answer
713 views

Problem adding WFS Layer to QGIS project

I want to load data using an WFS into qgis 1.7.4. After connection to the server is established, data seems to be downloaded, but no data is displayed in qgis, neither geometry nor attributes. The ...
0
votes
1answer
106 views

QgsLegend link error when building

I'm developping a software using QGIS. When building my software there is a LINK error. 1>mainwindow.obj : error LNK2019: symbole externe non résolu "public: __thiscall ...
2
votes
1answer
168 views

Sandbars feature extraction from satellite image

I want to know if we can analyse the permanancy of sandbars from a satellite image? Whether the formation of the sandbar is permanent or temporary.
3
votes
1answer
170 views

Is it possible to change the year range of time manager in QGIS?

I have a shapefile with a start and end time field, properly formatted. However my dates range from 1864-1995. When I try to use the shape file with the QGIS time manager plugin I keep getting this ...
1
vote
1answer
377 views

Quantum GIS Garmin Maps62 device and GPS utility - making a polygon for random point

I have a Garmin GPSMaps62 unit and GPS utility. I have logged tracks and need to get these to load as polygon layers in Quantum so that I can then ask Q to give me random sample points and upload ...
11
votes
4answers
2k views

How to place elevation numbers on contours with uphill orientation and position?

I want to orient my elevation labels uphill. Is that possible? I'm currently using the labeling tool from QGIS (not that one in layer settings). I want the labels curved and uphill oriented (and I ...
5
votes
3answers
1k views

How to generate colorful images using GDAL?

I am using gdal_translate -of JPEG -scale -co worldfile=yes ndvi.tiff output.jpg command to convert tiff images to jpg and resize it. But it generates only black and white images. How can I generate ...
3
votes
2answers
673 views

How to study qgis generated tiff images for water flow/resources ?

I am new to qgis. I have created tiff images from modis data using qgis. I want to study the water flow/resources from those images. As I am new to this field I don't understand how to study those ...
3
votes
0answers
356 views

Map is missing when I “export as image” via print composer [closed]

I have point data on a vector layer that prints accurately via print composer (when I "export as image"), however my map below either does not show up or shows up at an incorrect scale. I used ...
2
votes
2answers
2k views

QGIS installation error

Translation When QGIS is installed, it displays the following message: the ordinal 3109 could not be located in the dynamic library LIBEAY32.dll. Could someone please help me. Thanks. ...
1
vote
1answer
715 views

OpenStreetMap default style for roads

I'm using the OpenStreetMap plugin for QGIS and I've successfully rendered a .osm file (lines). I've tried a few styles from github but so far none of them label all of the streets like the osm ...
3
votes
2answers
1k views

Batch Dissolve Polygons based on Attributes in QGIS or FWTools

I was wondering if anyone can help with batching a dissolve. I have a few hundred polygon shapefiles that I want to dissolve based on an attribute. I would like to do this in QGIS or FWTools. Any ...
3
votes
0answers
376 views

How to reverse-georeference with QGIS?

I have a map with a "strange" projection (it's basically hand-painted, not an exact one). I can easily georeference it in QGIS using the Georeferencer plugin and the Thin Plate Spline transformation ...
3
votes
1answer
506 views

Where to download QGIS win7 x64 installer?

When I try to print big map (1200mm x 1200mm x 300dpi) on pretty strong computer (i7 975 12GB RAM) withj Windows 7 I obtain error Error - 'Image too big. Creation of image with bla bla pixels failed' ...
2
votes
1answer
505 views

Loading an older google satellite image with OpenLayers plugin in QGIS

I am using the OpenLayers plugin in QGIS. I want to use the google satellite layer, but there is a cloud on the specific image. Is it possible to load one of the older google satellite images? Like ...
5
votes
2answers
299 views

Python 3 with QGIS on Mac?

I need to start learning Python, and I want to learn with version 3.x. I understand that QGIS--at least some plug-ins--relies on Python and Tcl/Tk, and probably on specific versions. Assuming that ...
3
votes
3answers
478 views

Why do XLS files cause Error: “.. is not a valid or recognized data source”

In QGIS, I am trying to add some non-spatial data (in .xls file) that I want to use to join to some spatial data. Adding the file, either from 'add vector' or dragging file onto project I get the ...
2
votes
1answer
345 views

How to overlay my interpolation within the boundaries of Quebec?

I am trying to create interpolated maps within geographical borders. I have the coordinates and values to the points I am trying to interpolate. I also have a map of the geographical land mass in ...
2
votes
0answers
183 views

QGIS system architecture [closed]

I'd like to develop a simple spatial system with database for plotting and managing geographic features.I thought I should install on an ubuntu server: qgis server postgreSQL postGIS and write ...
1
vote
1answer
168 views

Interpreting the geom_way in the table created using osm2po [duplicate]

Possible Duplicate: Issues while plotting the results of pgRouting shortest path I am trying to actually figure out what this column exactly represents and how to use that in my case. I ...
1
vote
0answers
47 views

QGIS DBManager error when selecting a feature [duplicate]

Possible Duplicate: Why does my PostGIS query fail with “current transaction is aborted” having loaded a PostGIS layer on the QGIS canvas using the DBManager plugin, I am unable to select ...
2
votes
3answers
307 views

How to use MasterMap address layer with QGIS?

I have a copy of QGIS. I have a MasterMap address layer for my area. How do I get the map onto my computer and open it please?
11
votes
2answers
924 views

Is it possible to manually correct a raster DEM (OpenSource)?

Is it possible, to correct a raster DEM by changeing the raster-cell-values manually, like by "painting"? My DEM (ASTER) have one small error where the elevation is about 300m below the actual ...
7
votes
2answers
3k views

QGIS supported databases?

Does anyone know if there is some kind of documentation on which database types that you can connect to in QGIS? I would also like to know if: Can I use the databes for read only or read & write. ...
2
votes
0answers
115 views

Instalación masiva de QGIS - Automated installation of QGIS

Solicito lo siguiente requiere la línea de comandos que permitan realizar la instalación automatizada o desatendida para poder enviarla desde SCCM para la Instalación de QGIS Google Translate - ...
2
votes
1answer
250 views

How to create a button with QGIS

Comment créer un bouton avec QGIS? Bonjour, Je suis nouveau sur le site et je suis francophone, je cherche à crée un bouton avec QGIS mais je n'est pas arrivé à faire ce petit exercice s'il vous ...
6
votes
2answers
5k views

How to change the language setting/interface of Quantum GIS (to English) using Windows XP in French?

I want QGIS interface in English in order to share the information with the GIS community. Using other language than English when chating with the GIS community is very difficulte. When I installed ...
4
votes
1answer
336 views

Generate centroids for vector polygons based on raster and land-use data using QGIS

Although QGIS has the ability to generate centroids for polygons, I am not sure how to generate centroids based on land-use development using raster data. Here's an example of what I'm trying to do: ...
7
votes
1answer
589 views

Can QGIS display GeoRSS in real time?

QGIS has the ability to display GeoRSS by following these steps: Click on "Add Vector Layer..." icon Make sure the Data Source is "File" and enter the GeoRSS URL with "/viscurl/" prefix on the ...
2
votes
2answers
222 views

Is there any swamps/marshes symbol using Quantum GIS?

I am having hard time to find nature symbols for polygons. Any tips to find more symbol (any plugins?)
2
votes
1answer
218 views

how to extract overlap from non-dissolved buffer zones in qgis 1.7.4

I have a shapefile with the inventory of all limetree in a region. I made a buffer around each tree. So, the place where buffers overlap each other is the best place to put beehives. Is there a way ...
2
votes
1answer
513 views

Quantum GIS: Place all labels on a map non overlapped

As asked for ArcMAP by @dassouki, is there a way to place all labels on a map non overlapping using QGIS? Thanks in advance
2
votes
1answer
178 views

How to add FP_WGS_84_IBCAO_Polar_Stereographic projection to QGIS?

I have a GeoTiff image that is projected (see below) I would like to add this projection to the list of CRS in QGIS. Can someone help me do this? Thank you very much in advance!!! Francis ...
5
votes
1answer
2k views

How to do Kernel density analysis in QGIS 1.7?

Do someone have some suggestion? We would like to tray Kernel Density analysis as we did with ArcGis using QGIS?
6
votes
2answers
3k views

How to change DEM's gradient colour?

I'm a newbie about GIS. I'm from Italy and I've got a *.tif file of my region. I've loaded it has raster but I have a question: The dem has a gradient colour magenta. How change this colour to ...
1
vote
1answer
217 views

Exporting data from a WFS service to csv file using qgis

I have a service that contains a list of points with some meta data and I would like to export this to a csv file. I remember doing this some months ago and it worked well, but now I can't find the ...
1
vote
1answer
221 views

Digitize by User Input by Distance and Length in QGIS

I was wondering if anyone knows a way to digitize a line or polygon by user entered distance and length. This is an option in ArcMap, but I would like to be able to do this in QGIS. Thanks, Ryan
7
votes
1answer
1k views

One to Many Relationship in QGIS with PostGIS

Does anyone know of any tool that can do a One-to-Many relationship in QGIS. I have my data in a PostGIS database. I would like to be able to query spatial layers that are related to spatial or non ...
2
votes
0answers
112 views

OpenLayers Issue: plugin crash during opening [closed]

I've encountered problems while loading the OpenLayers plugin in Quantum GIS 1.7.4. My hardware: Windows 7 Home basic 64 Bits My Python crash window: Traceback (most recent call last): File ...
1
vote
2answers
386 views

FieldPyculator Plugin - How to Classify Fields?

Could someone tell me how to classify/populate fields with QGIS FieldPyculator Plugin? In the Attribute Table, I have a field named POPULACAO with population data: I want to apply a weight to ...
52
votes
3answers
28k views

File Geodatabase (*.gdb) support in QGIS?

Following questions: Open Source Tool capable of reading Esri File Geodatabase (.gdb)? How to access file geodatabase in Qgis? How to get FGDB support in GDAL 1.9 without compiling? I have spent ...
8
votes
2answers
385 views

Finding polygons without right angles

Now we are digitizing some buildings in specified area. The obligatory rule for this work - in most cases buildings should have right angles. We are using QGIS with CAD tools for this work. But ...
0
votes
3answers
658 views

How to run GDAL command in php page? [duplicate]

I want to develop a webportal that will show the QGIS generated images on dynamic website. For this reason I need to run gdal_translate command inside php page. but I don't know is it possible or not. ...