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

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1
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2answers
512 views

How to combine “positive” with “negative” polygons

I have 2 polygone classes (1 and 2). Inside the polygons are holes (white). Now I want to combine them with the polygon in witch the holes are. Understand? Sorry for that bad english... The white ...
4
votes
5answers
1k views

Elevation correction ASTER GDEM2 (+10m)

My ASTER GDEM2 has a average elevation error of -10m for my area. (I testet it using 90 defferential GPS reference points and compared it with old Topo25, SRTM, and GoogleMaps). I would like to ...
1
vote
1answer
189 views

QGIS - WGS84 to BC Albers reprojection no curved lines, any idea why? How to snap a line to a point?

I am trying to learn a bit about QGIS. So I thought I would drop in some layers of my Province and then recreate some points representing the BC Albers Central Meridian, and the two standard ...
2
votes
1answer
1k views

Projection ETRS89 (Ellipsoid: GRS80) 6-Degree Zone 33 to UTM33N - WGS84

Hi I'm having trouble to reproject a shape file in Qgis. The projection is supposed to be "ETRS89 (Ellipsoid: GRS80) 6-Degree Zone 33" and I would like to project it to UTM33N - WGS84 (EPSG 32633). ...
0
votes
0answers
64 views

How to turn off Google map data copyrighted window in Google Street layer (Qgis - Openlayers Plugin)? [duplicate]

Possible Duplicate: How to close watermarks in openlayers plugin After a few weeks not using Qgis, this morning I opened it up, accepted a request to update Openlayers Plugin. Right now, I ...
0
votes
2answers
5k views

Why won't QGIS recognize my GPS?

Garmin BaseCamp recognizes and receives data from my GPSmap 60CSx, but QGIS GPS Tools plugin does not. Am I missing a step? I want to be able to transfer data both directions. MacOS 10.6.8 QGIS ...
2
votes
2answers
199 views

Switch classes on/off within shapefile in QGIS 1.8

Hei! I got shapefile with 1800 points. They are classified by attribute in 10 classes. How can I display only 1 or 2 classes (like - switch on/off layer)? It seems quite usual function, but I ...
2
votes
0answers
211 views

Problem with geotiff in qgis only in some PCs

Helllo I'm having some weird problem opening a 16bits geotiff with qgis. In my pc it opens and displays perfectly, but in another pc (with the same version of qgis) it displays all wrong the image ...
2
votes
1answer
372 views

Does anyone know how to get the QGIS Web Client measure tool to show units in feet and miles?

Does anyone know how to change the QGIS Web Client measure tool (distance and area) so that it shows feet or miles rather than meters?
5
votes
1answer
982 views

Why are GeoJSON coordinates different exported from QGIS vs. ogr2ogr?

I have a shapefile with a Google Mercator projection (900913) that I need converted to GeoJSON. I need to do this on a regular basis amongst other things so I wrote a shell script to do it using ...
0
votes
0answers
24 views

Running QGIS on PC using XT (Desk top) [duplicate]

Possible Duplicate: How to fix QGIS error “Entry Point could not be located”? The error shown below occurs each time I try to run QGIS: The procedure entry point gtCPLError ...
1
vote
1answer
133 views

Projection - once again

I have a shape file with nature preservation areas (Biosphärenreservate) in Germany. I think the projection must be something like gauss-krüger zone 4 Pulkovo or something like that. When I reproject ...
9
votes
4answers
9k views

Splitting shapefile into separate shapefiles for each feature using QGIS/GDAL/SAGA?

I have a polyline shapefile with about 20 kinds of roads. I would like to know how can I create automatically a vector file for each one. I am aware of how to do it using ArcGIS for Desktop - see ...
27
votes
3answers
11k 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 ...
-4
votes
2answers
212 views

What kind of map is this

I would like to have/create a map of Kazakhstan in the same way as in the attached picture (grey map of UK and Irland) using QGIS? I don't know what kind of map is this, what its name and where I can ...
4
votes
2answers
928 views

How to configure 3rd parties for the sextante plugin in qgis?

I'm currently exploring the enourmous potencial that the sextante plugin for qgis has to offer. The model builder will surelly be a very handy tool. The problem is I'm not beeing able to run 3rd ...
2
votes
2answers
529 views

Map Coordinates to Neighborhoods from MySQL Table

I have a MySQL database with a set of coordinates and a shape file (Zillow Neighborhood Database for Chicago) containing the boundaries for each neighborhood which I have converted to a spatial ...
7
votes
1answer
2k views

How can i create sectors for telecom towers

friends i am seeking advice from the GIS community I work in the Mobile networks industry and i took up a task to create a plugin for QGIS using c++/python that does the following: step 1: Create ...
1
vote
2answers
730 views

Convert classified raster map back into vector classes

I have this map (have whole country, this is just a sample, original map also contains color symbology for the value classes) and need to attach the values from it to points. I have no problem to ...
3
votes
1answer
928 views

Splitting lines at a specified distance

Does exist some plugin with it is possible to Splitting lines at a specified distance in Qgis?
3
votes
2answers
1k views

How to vectorize a Raster-Classification? (qgis, grass)

I classified my raster-DHM into elevation levels using colormap. Its not a "real" classification, just a colormap. So I cant vectorize the classes to get polygones for every class. Whats the best ...
4
votes
1answer
1k views

Get a pixel value

How can i do this operation: I want to get a pixel value fro the satellite image (Landat, GeoTIFF, 7 bands) using qgis-python. What operators should i use? (for example in qgis's Python Console) ...
3
votes
1answer
228 views

Looking for guidance with beginner use cases

Background I'm more or less completely new to GIS. At work we use a program called Microvision which does stuff like work out drive distance (in addition to straight line distance) from which you can ...
2
votes
2answers
386 views

How to import .dbf with long text values?

I'm trying to join a .dbf I made in LibreOffice with a shapefile. The .dbf contains ~10 columns, three of which have a large amount of text (~100 words). When I import the .dbf into QGIS, all ...
0
votes
0answers
50 views

How we add XY coordinates (in the attribut table) from shapefile (points) using QGIS? [duplicate]

Possible Duplicate: How to get the coordinates in Lat/long from a point layer? I created a new shape file and edited to add points at specific location. Now, I would like to extract the XY ...
11
votes
2answers
15k views

How can I join several raster files using QGIS?

I'm new to QGIS. How can I combine multiple raster layers into one layer? The raster images are of different areas with very little overlap. The goal is to bring numerous town plats into one project. ...
5
votes
1answer
249 views

How to visually join river to lake in QGIS?

I have two shapefiles, one is for landuse (which contains forests, and also lakes), and another one for rivers. When I set the both water types to have outlines, they are not joined nicely - they ...
1
vote
2answers
531 views

How make .qgs files open in QGIS automatically on a Mac?

When saving a project my copy of Qgis used to assign file extension .qgis automatically. Now it assigns .qgs automatically, which means that I can't reopen it. All my old projects have also been ...
1
vote
0answers
202 views

QGIS 1.7.4 crashes when using interpolation tool [closed]

I am currently using QGIS with Lidar data to produce hillshade images. I have split the lidar data in 20 files (31kb). Some of the files are working some are not. I have checked the files xyz are ...
5
votes
5answers
5k views

Workflow for DXF interchange with QGIS

What is the best method of importing/exporting dxf files with QGIS ? I work in an engineering field and we use CAD and specialist design programs, and often go through several iterations during a ...
1
vote
1answer
2k views

How do I delete a point (not on a polygon)?

I want to delete points that is not part of a polygon. I can add points using Capture Point, but I can't delete them. The following solution does not work for points: Select your layer Enabled ...
2
votes
0answers
105 views

When using OpenLayers plugins maps, can I have Longitude/Lattitude labelled on my grid when using the Map composer in QGIS?

Using OpenLayers plugins maps, can I have Longitude/Latitude labelled on my grid when using the Map composer in QGIS?
1
vote
2answers
943 views

Interpolation of contours (from one “main-contour-shapefile”)

I calculated, that the best and smalest possible äquidistance (equidistant) for my map is 30m. After I generlized my DHM, I extracted contours of a intervall of 30m and smoothed them. Now I have my ...
7
votes
4answers
4k views

How to install “1-band color raster color table”?

I would like to use the "1-band raster colour table" extension. I'm using QGIS Wroclaw 1.7.4. In the plugin installer I can't find this extension, even I quote for third party extensions thing. Does ...
9
votes
3answers
4k views

Divide a complex shape file into a grid

I have a decently detailed shapefile with polygon/multipolygon features (the file is about 500mb). It's actually a shapefile of the entire world, with the features representing coastlines. I need to ...
1
vote
0answers
217 views

Installation problem with XY Tools [duplicate]

Possible Duplicate: How to install Pyton libs for XYtools to read Excel files I was using XY Tools plug-in for QGIS that converts Excel files into attribute table and shape files etc, but ...
1
vote
1answer
705 views

Cant install QGIS 1.7.4/1.8 after system update

after a routine system update my qgis got lost (xubuntu 12.04). After trying to reinstall 1.7.4 this massage apears in Softwarecenter (german): Die folgenden Pakete haben nicht erfüllte ...
7
votes
2answers
3k views

QGIS calculate distance of point along a line

I have a polyline (movement path) and points recorded along the line. I would like to calculate for each point the distance along the line in Quantum GIS. I hope for a result which will add a new ...
2
votes
3answers
444 views

QGIS: how to set data defined text angle without setting x and y coordinate using new style labelling

I have a problem setting angled text labels with the new-style labelling dialog. The situation is this: I have a shape file which only contains only labelling texts. This is a point layer, and it ...
1
vote
1answer
700 views

Working out percentage in QGIS field calculator

I have a project in QGIS where one of the things I need to do is work from a police data file with 9 months of crime information, linked to details of county population (age, employment, etc) to ...
2
votes
1answer
205 views

QGIS Cross Tab of Towns and Routes

Using QGIS, I have a layer with 100 towns. I have another layer with 200 cycle routes, each with a different name. I want to create (automatically natch) a table that will help the people in each ...
3
votes
1answer
468 views

How to display only one pie chart for polygon features in QGIS?

I'm working with Qgis on a project and I have a small problem. I have to do some demographic research and therefore I have a .shp file from a given country with 10 districts for example. Now, I know ...
1
vote
2answers
350 views

Select points within a relative number range

I need to select points that have attributes that are within a relative number range of each other. For instance; given the following numbers: 95,705,139,65,537,266,525 and 188; I need to find all of ...
4
votes
2answers
778 views

How to show two different labels of a particular vector layer with the help of QGIS?

I am working under a government project in Kolkata with QGIS. I want to show two different labels of a particular vector layer. just like we can show two different labels in Arc GIS with the help of ...
1
vote
1answer
225 views

hypsometric colors alà IMHOF, SYDOW or PEUCKNER

I need a hypsometric color-map to add it to my multishade-modell. (High Mountain between 800 and 4000m) There are a lot of differend typs explained in IMHOFS "Cartographic Relief Presentation". I want ...
5
votes
2answers
2k views

Layer misalignment with UK Ordnance Survey data and OpenLayers

I am in the UK and my QGIS projects are based on UK Ordnance Survey mapping data and are set up in EPSG:27700. Whenever I have tried dropping an OpenLayers layer (Google Satellite/Bing Maps Aerial) in ...
5
votes
1answer
517 views

How to open two projects at once in one QGIS window?

is it possible to have open two gis projects at once within QGIS? I want to compare the position of points between two different coordinate refercence systems. nice regards, jörn
5
votes
1answer
1k views

How can i delete multiple nodes, for a polygon, with Quantum GIS?

I know how to select a single node and delete it. I can also click-drag to select MULTIPLE nodes. But if i click delete, only one node (from the higlighted list) is removed. Can I delete all the ...
1
vote
1answer
294 views

Looking for QGIS Presentation info

I'm preparing a presentation of QGIS to release of the brazilian QGIS user guide. Thus, I would like insert some information about QGIS in global scale. Something like Tim's qgis-for-humanity ...
5
votes
2answers
293 views

Raster calculation confusion

I need to do some raster calculation, I've been trying to make it work but I am not sure everything is working properly. I need to apply a formula, but I am unsure if I am doing it properly. The ...