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

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4
votes
4answers
1k views

How to Digitize Free Satellite Imagery in QGIS - Alignment issues with Openlayers Plugin

I am trying to digitize OpenLayers data (such as Google satellite imagery) with no success. Whenever I try to move or zoom the canvas the vector layer I digitized loses the position relative to the ...
3
votes
1answer
506 views

How to set up a background map in WGS84 projection for interactive map?

I've started developing my own interactive map and I have some things which are not clear to me. I heard that OSM, Google maps and all similar maps use Google Mercator projection. But if I use that ...
1
vote
0answers
170 views

ODBC connection to Sybase SQL Anywhere database

I have my GIS data in ESRI personal geodatabase, and my attributes in a Sybase SQL Anywhere database. I would like to make a join between my GIS data and my tabular data, but don't understand how to ...
6
votes
2answers
225 views

Why is my Natural Earth map not shown correctly in QGIS? (strange circle; only Caucasian Sea shown)

Using the world map data from Natural Earth I have some problems with the correct displaying in QGIS. Shapefiles added: 1:10 Admin Countries 1:10 Oceans As you can see in my screenshot, there are ...
2
votes
0answers
63 views

Qgis don't show geometries

When I select a object in a particular layer using qgis in order to get information about it, this object don't get resalted in red and in the qgis log a get the following error: not found space ...
1
vote
1answer
416 views

Can a QGIS project (.qgs) be uploaded to work in map viewer in GIS Cloud?

Title says it all. Can a QGIS project be uploaded onto GIS CLoud to display all the properties i have asked it to display in QGIS? if not is there an equvilant GIS Server i can upload previous QGIS ...
5
votes
1answer
1k views

Is it possible to convert ArcGIS .mxd to QGIS .qgs without having ArcGIS installed? [duplicate]

I was reading How to convert an .mxd file to a .qgs file?. It looks as though this only works with ArcGIS 10. I would like to do this, but am unable to install things on the computer that has ...
3
votes
1answer
299 views

Clarification of Map Scale

I need some clarification. I have a map the is set to the scale of 1:6000. In Settings>Project Properties, under the General tab I have the Layer Units set to feet. Therfore I assume that means the ...
7
votes
2answers
215 views

How to create vertical labels in QGIS?

How to create vertical labels (each label in new line) like: 1998 150 pipe name and not horizontal: 1998 150 pipe name
1
vote
1answer
622 views

How to connect to MySQL from QGIS in Ubuntu10?

I have just installed Quantum GIS 1.8.0 on my Ubuntu 10. I want to add a MySql table as a data source but I can't see any options for connecting to mysql. Can any one guide me how to connect to ...
2
votes
0answers
126 views

Install Georeferencer Plug-in QGis 1.7.0 OS X

I'm trying to install the Georeferencer plug-in in QGis 1.7.0 on Mac OS X (10.5.8). However the plug-in doesn't show up in the list. I have used "enable 3rd parties directory" and I have checked ...
5
votes
1answer
194 views

How do I make the scalebar accurate when I am working with a google satellite image in QGIS?

I start a project in QGIS. I set the CRS to anything (in this case I use EPSG=26918 a NAD83 datum). I also enable on the fly projection. Then I import a vector. In this case a kml, which I believe is ...
3
votes
2answers
916 views

How to install shapely for python 2.6 (Mac) NOT 2.7?

I'm trying to use Polygonizer plugin inside QGIS, but it needs Shapely to work. I've installed Shapely (pip install Shapely) but that's for python 2.7. QGIS works with python 2.6 (on Snow Leopard) and ...
4
votes
1answer
215 views

What is the 'Layer' box in 'Save Vector Layer' good for?

In QGIS, in the 'save vector layer as' window, under OGR creation options, what is the 'Layer' box for?
5
votes
1answer
1k views

How to get labels to diplay in Google Earth after saving to KML?

When saving a QGIS layer as kml, is it possible to have labels be displayed when opened in Google Earth?
3
votes
1answer
586 views

How to keep layer style/symbology when saving as KML?

When saving as a kml, is it possible to keep the style of the QGIS layer? I have tried a couple plugins that have been mentioned on here: qgis2kml ('format not yet supported') and qgis2google2 ...
-4
votes
2answers
654 views

QGIS 1.8.0, 3.68 RAM, 2.4GHz — Slowwwww performance

What can I do to speed up QGIS panning and zoom in/out? I did not include any layer information in my question because it is still subjective. It's just that I cherish having an open source gis ...
5
votes
1answer
377 views

How can I export big SVGs for further use in Inkscape?

I am trying to export as an svg from Quantum GIS and import into Inkscape. However it is failing to Import. Inkscape comes up with the error 'Failed to load the requested file'. The files are quite ...
2
votes
2answers
339 views

How to avoid exceeding latitude and longitude limits, when importing a .csv file?

I am currently working with a project with "on the fly"-projection (WGS 84 / UTM zone 32U). Now I want to import a csv. file with points, which have a longitude and latitude using the "Add Delimited ...
3
votes
1answer
901 views

Can I create a 3D model in QGIS or is there some model for 3D city model?

Can I create a 3D model in QGIS or is there some model for 3D city models? I need these information for my project.
2
votes
0answers
162 views

Intersect errors, memory issues in QGIS

my datasets are: Track_02(simple road polyline shp) ***intersected with*** road_cat_cls(polygon for road categorization) elev_rcls_poly(polygonized classified DEM) slp_rcls_poly(polygonized ...
5
votes
2answers
2k views

How to use QGIS Zonal Stats Plugin from Python Console?

I am using the Zonal Stats plugin in QGIS to extract raster statistics from overlaying polygons (I have shapefiles of species distribution and I want to extract environmental data from within each ...
4
votes
3answers
268 views

Time-aware layers WCS Service

I am currently developing an application that requires to display raster images over a period of time (I'm looking how Hurrican Sandy progressed). While investigating, people have suggested that I ...
9
votes
3answers
4k views

How to determine the centroid of polygons?

I have a polygon vector and I want to quickly attain the centroid of this polygon for insertion in a text document. I am working with QGIS. I searched through other questions and although some are ...
3
votes
1answer
301 views

How to get correct scale values?

The scale of my map is wrong, no matter what coordinate system I use in my project. The map and all objects show the correct coordinates but the scale of the map shows nonsense and the measurement ...
4
votes
2answers
81 views

Where can I set the BufferColor property for labels in QGIS?

The accepted answer to this question suggests that the buffer color can be set as a data defined label property. However, in the Layer Properties > Labels > Advanced tab, the only options I can see ...
6
votes
1answer
426 views

QGIS define hexagon area around mapped points

I am using QGIS to map a number of radio antennas (for mobile network). Once I have the layer of the sites (done), I would like to assign to each site a coverage area (envelope). I could achieve that ...
2
votes
0answers
72 views

Spatial difference with vector functions [closed]

I have 2 shapefiles, 1 municipal boundary, 1 x properties (3000 Geomertien) I would like to form a spatial difference, this unfortunately does not work with the vector functions of QGIS. thank you ...
6
votes
3answers
2k views

What is XYZ format in QGIS?

Basic question, but I have been asked to export data to an XYZ format. Is this the same as CSV files. I am using QGIS 1.8.0. So i am presuming i select the data I want to export, right click its ...
1
vote
1answer
526 views

Is QGIS 1.8 available for Ubuntu? [duplicate]

Possible Duplicate: How to install QGIS on Ubuntu 12.04? Title says it all, and if so, how do I go about getting it? I currently have 1.7 Wroclaw installed via the Ubuntu Software Center, ...
2
votes
2answers
280 views

QGIS' georeferencer layer doesn't appear?

I use QGIS 1.8.0 for Linux, and I want to draw roads manually on the map. So according some tutorials, I use Raster>Geoferencer>Geoferencer to import a bitmap image including roads, and set ...
4
votes
2answers
886 views

How to generate Tiles with QuantumGIS or Mapnik

I would like to know how to generate Map Tiles using QGis. I have heard that it is possible to create tiles using QGis, only, I don't know how to do that. Googling did not work for me since I am not ...
8
votes
2answers
872 views

How to create svg symbols that have modifiable fill color, stroke color and stroke width?

I want to create some svg symbols for Qgis using Inkscape, those symbols must have attributes as described in the question. For the last two days, I have been experimenting as instructed by Sourcepole ...
9
votes
1answer
2k views

How to handle multiple map frames with different layers in one print layout?

Often I need two (or more) map frames in map layout to present different data next to each other. It is easy to make multiple map frames in QGIS Print Composer. BUT... It is in the nature of my work ...
3
votes
1answer
52 views

How to load multiple images with the same CRS?

When I add several images to QGIS 1.8 it asks the coordinate reference system for each one. There are several seconds in between the dialog and it is not easy to just continue working as the dialog ...
1
vote
1answer
877 views

How to use field calculator for area calculations in QGis? [duplicate]

Possible Duplicate: Calculate area between contour lines on a DEM with Qgis 1.8.0-Lisboa Based on a DEM of a whole country I have reclassified altitudinal bands with steps of 100 metres ...
3
votes
1answer
150 views

How to calculate the percentage of a Line through Polygons?

I have a straight line which runs through a bunch of polygons, which don't have spacing between them (border to border). Is there an easy way with QGIS to calculate which polygons it passes and by ...
11
votes
2answers
477 views

Moving points onto lines (~neighborhood)

I do have two vector layer, of which one is a point layer based on "events" by remote sensing and the second one is a line layer from local research. In my case these are earthquakes and tectonic ...
3
votes
1answer
101 views

Is it possible to create road-type dependent 'shields' in QGIS?

In QGIS, I need to place road numbers on a map (they are point labels) in solid rectangular boxes to make them stand out. Ideally they need to be the same colour as the road they refer to, so a ...
2
votes
1answer
86 views

Is the QGIS blog broken?

I would like to use the QGIS API in my own program to display maps .... So I thought I would find some tutorial here : http://hub.qgis.org/wiki/quantum-gis/Writing_custom_Applications_with_QGIS_API ...
3
votes
2answers
319 views

Print Map as Tiles in QGIS or using any software.?

i need to print a detailed map, on a street level zoom of Metro Manila. i figured to do this i need to download map tiles, but that will be a breach on map usage in OSM. then i found this website, ...
3
votes
1answer
199 views

How to determine error radius of given points

I am running QGIS 1.8.0 on a 64-bit Windows 7 platform. Given multiple points with different (but close) coordinates, how do I automatically create a new point that programmatically takes into ...
14
votes
3answers
362 views

Is it possible to use symbols instead of colours to visualise raster cell values?

I have a raster image (GeoTIFF) with integer values. I know how to visualise raster values in QGIS using colormaps or similar, but I would like to assign symbols to each colour value instead - just ...
1
vote
1answer
310 views

QGIS project on QGIS server — cannot load wms layer

I've created a qgis project on QGIS 1.8, copied it onto the QGIS Server, and am trying to load the project as a WMS Layer back into QGIS. There is one vector layer in the project. Paths have been set ...
7
votes
2answers
361 views

How to perform enhancement operations on an satellite imagery in QGIS?

I am a new user of QGIS please suggest how to perform image enhancement operations on an satellite imagery like ratioing, contrast stretching, edge engancement, filtering etc. in QGIS?
9
votes
3answers
2k views

How to programatically check for a mouse click in QGIS

I want to know how to check for a mouse click in QGIS. I am trying to write a python plugin and want to provide functionality similar to the "Select Single Feature" tool that already exists in QGIS. ...
1
vote
1answer
389 views

QGIS 1.8.0 - Define shapefile as UTM 15 NAD83 Feet

I have a shapefile which the .prj file says it is ...
5
votes
1answer
335 views

Why are points collected with a Trimble FM 750 off by more than a mile when displayed in QGIS?

I have a grower that has a FM 750 and is trying to make points in a field. When finished he takes the file out of the display and goes to his computer and he can bring up the points in the right ...
4
votes
1answer
277 views

How to fix incorrect coordinate data for the mouse's position

I am running Quantum GIS 1.8.0 on a 64-bit Windows platform. I've imported a data set that plots correctly when overlaid with a Google Satellite map, so I know that the layer/project CRS is okay ...
2
votes
2answers
119 views

QGIS on MAC cannot be opened because of an error

I know this question has been answered before, 3 months ago, but cannot work out how to join that thread. I have been using Mt Lion with QGIS successfully for some weeks but now get the 'Cannot be ...