Quantum GIS is a user-friendly, cross-platform GIS application licensed under the GNU General Public License.
7
votes
4answers
4k views
How to fix QGIS error “Entry Point could not be located”?
Today, after returning from vacations, I started my QGIS 1.7 and got this terrible message:
Help, anyone?
28
votes
2answers
10k views
How to get “.GDB” (Esri File Geodatabase) support in Quantum GIS (osgeo4w - qgis)
Following questions:
Open Source Tool capable of Reading .gdb?
How to access file geodatabase in Qgis?
How to get FGDB support in GDAL 1.9 without compiling?
I have spent around 2 days to find the ...
11
votes
5answers
9k views
Get list of coordinates for points in a layer?
I've got a layer in QGIS that is comprised of points. Its attribute table doesn't have the corresponding x y coordinates for each point. Is there a way for me to extract a list of coordinates for ...
34
votes
10answers
3k views
Where can I find QGIS tutorials and resources?
After several recommendations, I thought I'd familiarize myself with the capabilities of QGIS.
I downloaded the program, but apart from basic loading of data, I got lost (the help file wasn't much ...
35
votes
4answers
11k views
How to build effective heat-maps?
Using ArcGIS, QuantumGIS, Grass, and/or GVSIG
What are some of the tools and processes involved in building effective heat maps?
What are the plugins involved?
What are the major data requirements?
...
13
votes
3answers
8k views
How to clip a raster with vector boundaries?
I am using QGIS. I would like to clip a raster precipitation layer using an admin boundary layer that is vector data. However the geoprocessing tools seem to be usable only for vector data. How can ...
8
votes
2answers
2k views
How to perform Raster Reclassification in QGIS?
Is there a way to do reclassify a raster image to Qgis?
In Arcgis you can do that in Spatial analyst Tools-->Reclass-->Reclassify
Any ideas?
5
votes
1answer
387 views
Qgis polygonize problem - DLL load fail
I have a raster file and I want to perform the method "polygonize". Then the problem occurs, that is shown on the screenshot.
It doesn t have anything to do with the rasterfile format, I veryfied.
...
19
votes
7answers
8k views
Removing small spaces between polygons
I have a set of polygons representing administrative districts. The districts were digitized by hand, and there are small spaces between polygons where the polygons should be touching. How can I ...
10
votes
2answers
7k views
How to calculate polygon areas in QGIS?
Hi I would like to simply calculate areas of a area-shape file in square meters or in acres (ha).
I didn't find that functionality in the vector tools.
Could anyone here help me with that?
4
votes
4answers
1k views
How to split a vector in equal smaller parts in QGIS or similar?
i want to divide a shapefile with many tiles into a lot of smaller tiles.
I am searching for a smart solution, because manual edits are out of questions
Anyone can help or know a nice function?
13
votes
1answer
1k views
How to define new custom projections in QGIS?
I'm trying to define a projection in QGIS. I want to add North America Albers Equal Area Conic. From the spatialreference site I copied the proj4 line:
+proj=aea +lat_1=20 +lat_2=60 +lat_0=40 ...
6
votes
5answers
4k views
How to join multiple records to single feature?
apologies for what I'm guessing is a really easy problem to solve. GIS user, not programmer here.
I'm trying to create a join/relate in QGIS where I have a shapefile of buildings and to that I would ...
6
votes
1answer
2k views
How to create a point along a line given distance
I have been given a non-spatial database which contains the names of lines which I have a shapefile for. The database also has names of points and the distance of each point from the origin along the ...
7
votes
3answers
1k views
How to create polygons with straight lines and right angles in QGIS?
I am running QGIS 1.7.0 on Mac OS X 10.6.8.
When creating a polygon, how do I do it so that the lines are straight (90, 0 degrees, etc.) and when I create corners they can be right angles?
For ...
6
votes
2answers
385 views
Elevation profile 10 km each side of a line
How can I get an elevation profile for a band of terrain?
The highest elevation within 10 km (on each side of the defined line) should be taken into account.
I hope my question is clear.
Thank you ...
5
votes
6answers
1k views
How to get “.GDB” Esri File Geodatabase in QGIS for MAC OSX 10.6?
I understand there are programs like OSGeo4W that allow windows users to work with File Geodatabases, but is there something similar for Mac OSX?
4
votes
6answers
5k views
How to import a DWG into a QGIS project?
I have a lot of DWG files like base map, and water and wastewater network.
I am lookin for the principal steps to import my files into my QGIS project.
16
votes
3answers
2k views
How can I calculate the average width of a polygon?
I'm interested in examining the average width of a polygon that represents the road surface. I also have the road centerline as a vector (which is sometimes not exactly in the center). In this example ...
12
votes
2answers
4k views
How to convert an .mxd file to a .qgs file?
I recently tried to use QuantumGIS and I wondered if you can turn in a draft format ESRI mxd loadable qgs. This would avoid thematize the entire project.
Thanks for your help.
9
votes
1answer
3k views
How do I calculate the latitude and longitude of points using QGIS?
I'm trying to figure out how to calculate the lat/long of points using the QGIS field calculator. Is there an easy way to do this? I saw a previous related question, but it deals with a more advanced ...
8
votes
2answers
622 views
6
votes
3answers
689 views
How to read Greek fonts (ISO-8859-7) in shapefile attributes within QGIS 1.8.0?
I'd like to ask whether there is a way to read greek fonts in a shapefile's attribute table within QGIS 1.8.0.
5
votes
2answers
2k views
Rotating a vector layer in QGIS with qgsAffine (or other method)?
I would like to rotate a set of vector points in QGIS an arbitrary number of degrees around a central point (or arbitrary point).
This is similar to a recent question about creating a regular grid; ...
4
votes
8answers
5k views
How to convert KML to shapefile without losing attributes?
I'm new to QGIS and all Geoinformation itself but have to work on some difficult stuff.
I have a KML file with hundreds of points.
To each point there is information, such as Name, power, Age (it's a ...
6
votes
4answers
980 views
How to georeference a vector layer with control points?
I have a non-georeferenced vector layer that I need to be georeferenced. With raster layers the task is easy and straightforward, but I have no idea what should I do with my vector layer. I have a few ...
6
votes
1answer
770 views
How to create a style file for QGIS from a plain text file?
Using QGIS 1.7.
I have a plain text file, which lists 115 rgb values against a map code for a geological map. Viz.:
$ head gsv1Msymbology.txt
MAPCODE RED GREEN BLUE
Oc 143 255 255
WAT 255 255 255
...
5
votes
2answers
626 views
How to add links to PDFs in a Shapefile?
I have a problem. I want an attribute in a shape file named "Link" to add. The works are all fine. But then I would like to add a link in my directory. This link accesses a PDF. Now, this PDF is not ...
5
votes
3answers
2k views
Why don't my Shapefiles and OSM data overlap in Quantum GIS?
So I'm pretty new to GIS, and I'm working on a mapping project using data for Vancouver, Canada. I want to combine Open Street Map data along with data provided by the City of Vancouver. But the City ...
8
votes
1answer
1k views
How to convert .shp into .gpx using QGIS?
I'm newbie using QGIS. I would like to convert .shp into .gpx. So, using Qgis, I open my shapefile and I tried to "save as" gpx but it gives an OGR error:
creation of field ObjectId failed (OGR ...
5
votes
1answer
255 views
Where are the Expression-based Labeling options in QGIS?
I have imported a layer into my map to show the location of towns/cities. However I had to set graduated styling so that only cities over a certain population show.
I now want to label the ones that ...
5
votes
3answers
5k views
How to convert a vector layer to raster?
In qgis in the raster menu there is an item "convert vector to raster".
This behaves strangely - I do not understand how it is supposed to work.
I can select a vector file, an attribute and an ...
3
votes
1answer
225 views
Raster incorrectly reprojected to OSGB(27700)
Ubuntu 12.04, QGIS 1.8.0, GDAL/OGR 1.7.3, GEOS 3.2.2
Open a Spatialite db with OS Mastermap poly layer (EPSG:27700);
Add OpenLayers Plugin (1.0) from QGIS offical repository;
Add a Google Satellite ...
2
votes
1answer
234 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 = ...
29
votes
8answers
8k views
QGIS and gvSIG comparison
Many debutant GIS users are asking me which one is better QGIS or gvSIG. Since I use Qgis and I don't have any experience in gvSIG, I aways say that both are very nice softwares and the chose is a ...
18
votes
4answers
2k views
Is there any model builder in QGIS or other open source GIS?
Like the model builder in ArcGIS Desktop to run simultaneous geoprocessing tools, is there any model builder available in QGIS or an open source GIS software.
15
votes
3answers
2k views
Visualising WKT geometry string in QGIS
A very simple question: Is there a simple tool in QGIS to graphically visualise geometry formatted as text?
Example geometry:
"POLYGON((571178 6337246,571178 6402217,598061 6402217,598061
...
10
votes
3answers
2k views
How to join attributes from nearest point in QGIS?
I have two layers with points, call them A and B, each with different attributes.
For each point in A I want to join all the attributes from the nearest point in B.
Ideally this would also include ...
9
votes
4answers
2k views
How to create equidistant points in QGIS?
I am trying to create points (new layer) at specific distance along the road (existing layer) in QGIS. This gives solution for ArcGIS. How to achieve this in QGIS? This one explains how to create ...
15
votes
3answers
3k views
How to make a spatial view in PostGIS and add it as a layer in QGIS?
In PostGIS 2.0, what is the most efficient way to create a spatially enabled view that is viewable in QGIS?
I followed the context of Part 2 of @Mike Toews answer to this question, and the view ...
10
votes
1answer
3k views
How to install a QGIS plugin when offline?
Due to various IT policies at my workplace, QGIS is installed on a machine that is not connected to the internet. I wish to install a couple of QGIS plugins on this system.
I have downloaded the ...
10
votes
4answers
4k views
Join non-spatial CSV to spatial data in QGIS
I have a csv which has postcode data in a field, but it is non-spatial e.g. no Easting and Northing. I have a shapefile with postcode in a field and some additional data.
I want to join the csv with ...
9
votes
4answers
872 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 ...
8
votes
8answers
9k views
How to install QGIS on Ubuntu 12.04?
Has anyone had any luck with getting QGIS working on Ubuntu 12.04? I have tried the stable and unstable versions and with not luck. I also get the following:
"Some packages could not be installed. ...
8
votes
2answers
996 views
Running QGis from flash drive
How can I setup a portable QGis to run from a flash drive / USB-Stick?
In the userguide for QGis 1.7 Wroclaw there is only mentioned the option of "--configpath". But to me it is not clear how to deal ...
8
votes
2answers
1k views
How to get FGDB support in GDAL 1.9 without compiling?
I was hoping that I could use the 'master' (nightly-build) version of QGIS to get fgdb support without compiliing (I'm not a developer and frankly have wasted days of productive time trying to get ...
7
votes
2answers
882 views
How to check Topology in QGIS?
I have two Shapefiles with Polygons ( City and Forerst)
Is there a Plugin who is able check the topology (QGIS)? Like "Knots do not overlap" or something like that? I dont want that they overlap.
...
7
votes
4answers
1k views
How to close watermarks window in QGIS Openlayers plugin?
I'm using Quantum GIS Ver. 1.7.4. I have upgraded openlayers plugin 0.7 to 0.9. However when I open google satellite, a watermarks/copyright dialog box "Data Peta@2012 ..." appear in the middle of the ...
7
votes
3answers
2k views
QGIS- How to create an “area of interest” polygon mask
I've created a GP tool using ArcGIS that creates an "area of interest" mask from selected features. Effectively it creates a new donut polygon layer where the hole was the previously selected ...
6
votes
1answer
116 views
How to address the new “Task-Completed” QgsMessageBar in Python?
I am really amazed what huge steps the QGIS development has taken in the last months. The new iconset, the improved Print composer and many more changes to be seen in QGIS 2.0 are really awesome!
...
