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Questions tagged [qgis]

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

2
votes
3answers
2k views

Extracting data from GeoMedia *.mdf database without using GeoMedia?

Is it possible to extract data from Geomedia .mdf without Geomedia? Preferably with use of QGIS or ArcGIS for Desktop?
12
votes
2answers
4k views

What is the standard Mercator projection?

I'm using QGIS in order to re-project a shapefile I have into "Mercator" so that something like protoviz understands my co-ordinates. Protoviz tells me "Mercator" (http://vis.stanford.edu/protovis/ex/...
6
votes
1answer
1k views

QGIS WKT Raster Plugin error, what does this mean?

I have been playing with the WKT Raster plugin. I have installed the WKT Raster experimental binaries in PostGIS successfully and followed the instructions in the read me to the letter. When i am in ...
5
votes
2answers
2k views

How to return raster values based on polygon (shapefile) boundaries in QGIS?

How to return raster values based on polygon (shapefile) boundaries in QGIS? Is this an elementary question, because I am finding it hard....... Ideally I would like a neat workflow as I am likely to ...
5
votes
1answer
2k views

Transform polygon to equivalent circle, QGis

I have a polygon and I'd like to find the radius of an equivalent circle from a particular point within the polygon. The polygon would have a large (infinite) number of points evenly distributed ...
4
votes
1answer
5k views

Saving Google Earth Location: OpenLayers Plugin in Quantum GIS

I use the OpenLayers plugin to load Google Earth Layers in Quantum GIS to digitize/identify certain features. As my work is large occassionally I have to quit Quantum GIS to resume later. The problem ...
22
votes
5answers
12k views

A SQL console in QGIS

I know QGIS comes with its field calculator, which is not bad. It also comes with ftools which permits several operations on geometry and attributes. But we often need more control and I haven't seen ...
19
votes
6answers
27k 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 ...
30
votes
2answers
6k views

Can QGIS preserve layers when exporting to PDF?

In ArcMap, when you export data to PDF it preserves the layering within the PDF so that you can turn on/off individual map layers (within the PDF itself). When I export from QGIS to PDF, I don't ...
11
votes
3answers
14k views

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 ...
17
votes
2answers
10k views

Is it possible to create Thiessen polygons around nodes in QGIS?

Is it possible to create Thiessen polygons around nodes in QGIS? e.g. http://en.wikipedia.org/wiki/Voronoi_diagram
1
vote
1answer
528 views

libnetcdf.so.4 error while installing qgis 1.6.0

I am trying to install Quantum GIS 1.6.0 from source on Ubuntu 10.10 64-bit OS. I have GRASS GIS 6.4.1svn installed on the machine. When I run 'make' I get the following error: [ 34%] Built target ...
3
votes
2answers
1k views

Is it possible to get arcpy on 9.3* or Qgis? Or maybe some of the functions?

If this isn't possible what would be the closest equivalent open source? Could parts of the module be ported to work on 9.3 or QGIS? I'm not sure if this would infringe on the license porting for 9.3.
5
votes
1answer
3k views

Understanding why buffers not circular in QGIS?

I would like to select areas under a particular circular radius in QGIS. I believe this is accomplished with the buffer tool, but when I specify the radius the area is not circular. How to make them ...
6
votes
2answers
3k views

How to set the value of a pixel based on its current value?

I am attempting to set the value of a pixel based on its current value. I am using the Raster Calculator in Quantum GIS dev 1.7 trunk. For example, if the value is 0, I want to set it to 255. Based ...
3
votes
1answer
3k views

How to Buffer with intersections in QGIS

I am buffering a layer of facilities (points). I will then use the buffer to clip and intersect another layer, containing resources. I want to answer the question, how much of the resource lies ...
24
votes
8answers
23k views

Generate points that lie inside polygon

I have polygon feature and want to be able to generate points inside it. I need this for one classification task. Generating random points until one is inside the polygon wouldn't work because it's ...
4
votes
3answers
6k views

Using CityGML data with ArcGIS Desktop or QGIS?

I'm looking for advice on how best to use the CityGML data-structure and GIS (preferably ArcGIS/QGIS). I've read through their website and wiki and saw a list of software here that can be used to view ...
37
votes
4answers
31k views

Joining non-spatial CSV file to spatial data (shapefile) using QGIS?

I have a CSV file 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 ...
2
votes
2answers
267 views

Why are results all black using gdalwarp via QGIS?

I'm trying to convert a bmp image in BNG to WGS84 using gdalwarp (via QGIS). It seems to be running without errors but the output is all black. What am I doing wrong?
5
votes
3answers
2k views

How to label features in QGIS using SQL statement?

In QGIS, I can't seem to find a way to define the features that I want to label using a SQL query? Is this possible? For example, I downloaded the OSM Natural shapefiles, and a lot of those features ...
6
votes
4answers
2k views

QGIS: Is it possible to edit the datasource of a PostGIS layer?

After creating a layer with RT_SQL_Layer plugin, I want to change some details in the query. Is this possible, or do I need to create a new layer every time I want to change something in the query? ...
2
votes
3answers
2k views

Why is this polygon “self intersected” and invalid?

I have a polygon defined as follows: segment from 43:29:02 N 003:50:39 E to 43:34:12 N 003:43:04 E arc(CW): center (43:34:49 N 003:58:16 E) from 43:34:12 N 003:43:04 E to 43:45:45 N 003:59:56 E ...
2
votes
1answer
500 views

QGIS Fetch Python Plugins Crash

I am using QGIS v1.6 on Ubuntu 10.10. When I use the Fetch Python Plugins menu item QGIS crashes. If I run from the terminal with sudo I get the following error: Segmentation Fault Does anyone know ...
8
votes
4answers
3k views

Is it possible to create 3D dxf with OGR?

Does anyone know if it's possible to create a 3D dxf with OGR? I would like to assign the contour lines a Z value and then export them to dxf for some cad work. PS. I know FME can do this, however I ...
18
votes
7answers
17k views

How to change the order of features in a shapefile?

I have a shapefile and I want to change the order of the features. Is that possible? I want to sort the features in the shapefile because I'm embedding this shapefile in a mobile app. The app will ...
8
votes
1answer
1k views

“On the fly” projection ON by default?

In QGIS 1.6, can users set "on the fly projection" to be checked ON by default (at application launch)? I know how to turn it on, but some users find they use it more often than not, and would like ...
11
votes
2answers
3k views

How do you display related records in QGIS?

Coming from an esri background I have always used relationship classes in a gdb to display records related to a feature. Eg. Relate 1 survey point to many documents, photos etc. Does any one know how ...
5
votes
2answers
886 views

Distribute points respect to features using Quantum Gis

I want to know if there is any tool to make points with respect to selected features in a theme? Using: vector, investigating tools, regular points you can do it but not with respect to a selected ...
7
votes
2answers
2k views

Support for PostgreSQL / PostGIS Inherited Tables in MapInfo/QGIS

Does anyone know if MapInfo and QGIS will support inheritance in a PostgreSQL/PostGIS database? I would like to make use of inheritance but need to make sure the software I use will work with them. ...
11
votes
2answers
8k views

How to use label classes, expressions, and annotations?

I've always found that when it comes to python, vector analysis, QGIS gives ArcGIS a run for its money, hell some of the qgis plugins exceed ArcGIS's performance by a few hours; however, I always have ...
7
votes
3answers
4k views

How To Convert A Set of ARC/Info ASCII .e00, .e01, .e02, etc Files Into .shp Files

I have a set files that I downloaded with extensions (.e00, .e01, .e02, etc). I have read that these are files used by ARC Info mainly, but I do not have ARC and nor am I really that interested in ...
8
votes
2answers
1k views

Are there any tools / plugins to develop mapbooks using QGIS?

Are there any tools / plugins to develop mapbooks using QGIS?
4
votes
1answer
829 views

esri pgdb in qgis

Using osgeo4w 1.5, when I go to add vector layer and select file type, navigate to my esri pgdb. I get a not a valid or recognized data source. If I use the database type I get a page that defaults ...
12
votes
2answers
6k views

Derive WGS84 Longitude & Latitude from British Northings & Eastings

I'm looking for a fairly simple way to append columns with WGS84 longitude and latitude to a table containing northings and eastings. The source data is Ordnance Survey's CodePoint Open, which I is ...
3
votes
3answers
330 views

Trouble getting metacarta to work with qgis?

I have a basic issue with getting QGIS to accept the metacarta WMS service and wonder if anyone can guide me. I add the "basic layers" to the map, but still can't see the tiles there when I go to the ...
17
votes
4answers
6k views

Shaded relief from DEM in GRASS and QGIS

I have been trying to get a good looking shaded relief model out of GRASS and Qgis for a day or so now and just can't seem to get it. The biggest problem I'm having is the valleys look like mountains,...
16
votes
2answers
28k views

Controlling Image Output Settings in QGIS?

I am exporting a QGIS map to an image format. I would like to have control over the output settings of the image (dpi), as currently it is only exporting the images at 96 dpi. Does anyone know if ...
9
votes
9answers
10k views

Extract boundary from detailed layers in ArcGIS Desktop or QGIS?

Is it possible to return the boundary (outside) perimeter of a polygon layer? Let's say you have the map of the USA, for simplicity, broken down to the county level, is it possible to return the ...
53
votes
13answers
18k views

Seeking QGIS tutorials and web resources?

I wish to familiarize myself with the capabilities of QGIS up to and beyond QGIS version 3.0. Can you recommend some good web resources and tutorials that would show me QGIS' capabilities? I am ...
4
votes
2answers
503 views

Misalignment when generating centroids with Qgis

I was wondering if anyone could shed a light on why this behavior is happening in QGIS ? I'm pretty confident that the issue here is not due to "centroids within polygon" Edit Added a detailed ...
3
votes
1answer
549 views

Is QGIS compatible with PostgreSQL 8.4 Advanced enterprise DB with Oracle compatibility?

Sorry for such a long question. We are trialling EnterpriseDB Postgres Plus Advanced Server 8.4 with Oracle compatibility and PostGIS 1.5.1. I can create a connection to the database in qgis and the ...
9
votes
1answer
3k views

Tiled Map Services from Geowebcache in QGIS?

Can QGIS consume Tile Map Services from GeoWebCache? I know there is a article on the QGIS website which states that it does support tiled map services but it lists Tile Cache from Meta Carta labs ...
6
votes
3answers
1k views

Altering composer label items in QGIS with Python

I'm only new to QGIS and Python so this may exists already, and hopefully be easy to do. What I'm hoping to do sometime in the future is build a map book generator using QGIS as the base. In order ...
6
votes
2answers
9k views

How do you Turn on the GRASS plugin in Quantum GIS?

I downloaded and installed Quantum GIS 1.5.0 with GRASS using the OSGeo4W installer on my Windows XP machine. Unfortunately, when I go to Plugins>Manage Plugins I cannot find the GRASS plugin. When ...
6
votes
1answer
3k views

How to clear python console in QGIS?

After running several hundred lines of commands (and getting their subsequent error statements...), it is nice to be able to clear out the console window and start clean. In the Python Console ...
7
votes
2answers
4k views

Using Qgis API and python, how can I return latitude and longitude of a point?

I have a point layer, that I'd like to return the Longitude, latitude using the qgis api. I assume I need to use QgsPoint
4
votes
3answers
9k views

Measuring polyline using either QGIS or ArcGIS Desktop?

I've collected a bunch of GPS polylines (WGS84). What is the easiest way to measure the length of these lines in KM using QGIS or ArcGIS Desktop?
7
votes
4answers
4k views

Quantum GIS and ECW images?

How might I enable Quantum GIS to read ECW imagery? At the moment I'm mostly concerned about this on Ubuntu 10.4 amd64, but I also use WinXP & Win7.
9
votes
1answer
1k views

How to read/write from/to QGIS project file using Python?

I'd like to save the project-dependent configuration of my Python plugin inside the QGIS project file. Is this possible and what are best practices to do so?