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

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4
votes
1answer
113 views

Can I add entries to the layerlist context menu?

I am implementing a python based plugin for use with QGIS 1.8. Most of it's user interface is contained within a QDockWidget but there are some layer specific controls I would like to append to the ...
3
votes
1answer
529 views

Join attributes by location

I am trying to join multiple records that occupy the same location (polygon centroid) and have tried using the join by location plug-in but have found this does not work for me in this case as I have ...
3
votes
0answers
69 views

Can QGIS give GeoJSON layers a meaningful default name?

When I add a GeoJSON layer to my QGIS project, it always gets the name OGRGeoJSON. This is in contrast with shapefile layers, which seem to be named after the file name by default. Is there a way to ...
1
vote
1answer
1k views

ECW on Mac Osx 10.8 Mountain Lion

I'm having some problems with GdalTools on QGIS 1.8, with MacOsx 10.8: I've the GDAL complete library 1.9 but ECW is still a not supported format. What should I do? Thanks
1
vote
0answers
131 views

.dbf assocaited with aerial photos

I have aerial photos that are .jp2 format and are compiled into a .dbf. In ArcGIS I can simple add the .dbf file and all the aerials automatically appear. Can this be done in QGIS, rather than insert ...
2
votes
0answers
118 views

How to cut lines in a shapefile following a GPX-source?

I have a OSM-Shapefile containing all roads of a given area. I need an overlay cut out of this source-Shapefile that contains only some routes that I want to highlight on my map. I have some ...
1
vote
1answer
72 views

VS 2008 qgis win libraries

I am building an app using qgis in Windows 7 with VS 2008. It was diagnosed that I must have the wrong versions of the libraries because of a potential name mangling problem. I have 12 unresolved ...
5
votes
2answers
1k views

How to split an irregular polygon into equal areas?

I am a surveyor and use QGIS for maintaining soil test records on civil projects and am constantly provided with test lot area or number of lots required. These are more often than not irregular in ...
1
vote
1answer
138 views

Issues with OSM Plugin in QGIS on Ubuntu 12.04

(not sure how to wrap the subject into a question! But...) Here are some issues I've been having with the OSM plugin: 1) When I bring in the .OSM file, close QGIS, then reopen, I get a "Handle Bad ...
4
votes
3answers
950 views

Running a Python Script to Extract Raster Data in QGIS

I am trying to use QGIS to extract raster statistics for shapefiles (I have shapefiles of species distribution and I want to extract environmental data from within each species' range). This is ...
1
vote
0answers
168 views

QGIS 1.8 fails to add vector data layer from directory

I 'm running QGIS 1.8 on Windows 7 and trying to add vector data from an ESRI gdb directory. It worked before on another machine, after following the instructions on this thread: How to get ...
1
vote
1answer
27 views

Revise from repository on standalone Win7?

I'd like to fix the bug in QGIS whereby starting QGIS offline or on a slow connection can kill it, using this revision: ...
3
votes
1answer
141 views

Why does the QGIS 'project properties' option disappear in Ubuntu?

For some reason my 'project properties' button has disappeared for good. I'm using Ubuntu 12.04 and QGIS 1.8. Sometimes it would straight up disappear, to return later, but now its just 'gone'. I'll ...
7
votes
1answer
308 views

QGIS: subtypes and domains like in ArcGIS?

s there a opportunity to use subtypes and domains in QGIS (Desktop 1.8.0) like the way you use in ArcGIS? I´m specially interested in the possibility of dependencies between subtypes and domains: not ...
1
vote
2answers
387 views

What's the correct csv format for MMQGIS Join by attribute?

When trying to join attributes from CSV-file with MMQGIS, I currently get the error message: File inaccessible or in unrecognized CSV format /Netzplanung/Truck_park/trkbuspk15_2.csv Tried with ...
4
votes
1answer
1k views

Importing shapefile in grass

I have very simple shapefile, which consists of couple of polygons, and I wanted to snap boundaries automatically. Unfortunately qgis doesn't have such function, but grass has according this answer: ...
4
votes
1answer
360 views

Extracting donut holes as separate layer in QGIS

Does anyone know how I can extract the holes in a polygon layer as a separate layer in Quantum GIS? An example could be a country with a number of lakes cut out of the polygon - I need the lakes. I ...
0
votes
2answers
165 views

Can I incorporate an existing DBF file with coordinates for Tiff tiles into geodatabase like spatialite?

I have 285 Tiff files that make up the 1:10000 OS map of Norhtern Ireland. I am having problems running QGIS when I try to load all 285 tiff files in for base maps (I think the memory on computer is ...
2
votes
0answers
58 views

Strange line appearing

I have this line in my project's layer which i cant make disappear: I hope you can see it. In QGIS is much more visible. An it also appears on the print composer. Any suggestions would be very ...
3
votes
2answers
523 views

Why does On-the-fly reprojection not line up Google layers in UTM?

My UTM shapefile lines up with Google layers if the project CRS is set to WGS84 mercator projection (including default 3857 and Google). But if I set the project CRS to UTM Zone11, they are slightly ...
10
votes
2answers
578 views

How can I improve my Georeferencing results?

Background This is my second question related to georeferencing naked raster maps in order to re-visualize them on different coordinate systems and in conjunction with other data layers. The previous ...
3
votes
2answers
1k views

Why is my new Shapefile layer not showing up?

I am having trouble with a new shape layer not showing up on my map. The attribute table is showing up fine and all of the points are in there, however visually, there are no dots showing on the map. ...
9
votes
4answers
742 views

How to “clean” and vectorize a raster map?

I'd like to make use of a geological map as shown in the example below, which is only a pretty small and downsized part of the map, so editing/redrawing doesn't seem to make sense in the end. My idea ...
6
votes
2answers
308 views

How to generate discrete areas from multiple, overlapping features?

I have a point dataset that I want to append some information from a polygon to. My polygon shapefile contains over 500 features. Whilst each of these features represents individual areas they are ...
3
votes
2answers
441 views

Easy Search of Road or Address in QGIS

Is there an easy way to search for a road name in a polyline layer in QGIS? I'm looking for something like what ArcMap 10.1 has, just a basic search box where I can type in a name and have it give me ...
1
vote
0answers
34 views

Is it possible to permanently save the Edit Widget for a Postgis layer?

Is there a way of configure the editing type for a POSTGIS layer through Edit Plugin and do not lose the changes after remove the layer or exit the program?
2
votes
1answer
516 views

How to delete rings automatically using QGIS/Grass

I'm cleaning up a (very) messy shapefile in QGIS/Grass. I now have several large polygons with numerous (100s) of small rings. Is there a quick and easy way to remove/ fill all these small rings. ...
2
votes
0answers
149 views

Display a color ramp legend (of a vector layer) in the qgis map composer

I would like to have a color ramp instead of 10 categories of color when displaying my vector layer in the map composer of QGIS. Is it possible ? Thank you in advance
3
votes
1answer
435 views

How to select the nearest lines to a point layer?

I am a beginner with GIS software and I'm working on QGIS. I have a problem joining the spatial layers. I have a layer with objects in one city and another layer with the streets. I need to attach ...
2
votes
0answers
270 views

MSSQL spatial layer import error

I am currently working on a project in which spatial data are stored in a Microsoft SQL Server 2008 database. The tables which hold the spatial table contain 3 rows and are: RoomId - BIGINT, ...
2
votes
1answer
880 views

QGIS field-calculator replace function

I've got a Shapefile containing contourlines which I would like to style differently according to their value. For that reason I created a field named "100s" where I would like to give values from ...
3
votes
2answers
302 views

Data security for GIS Data (Esri shape files,Auto-cad files)

This is regarding security for GIS Data (in Esri & open source) (Esri shape files,Auto-cad files etc.) Does anyone know how to assign a password to or encrypt shapefiles OR CAD Data? I have ...
6
votes
2answers
344 views

Is there a quick way to invert a node selection in QGIS?

is there any way to invert a node selection in QGIS? For example, I want to extract a small section of a long line - if I select the nodes I want to keep, is there any way to invert that selection so ...
2
votes
0answers
70 views

Problem looking at tables within ESRI geodatbase

I installed the most recent OSGeo4W with QGIS 1.8.0 and GDAL 1.9.2 on my Windows 7 PC. I can load an ESRI geodatabase (.gdb file) and I can get the window "Select vector layers to add". When I click ...
3
votes
0answers
109 views

Why doesn't Polygonizer copy the line ids to my polygonized shapefile?

I am trying to convert a line shapefile into a polygon shapefile using Polygonizer plugin, and when my new polygons are created all the cells in my id field are "Null", although I have clicked "copy ...
2
votes
1answer
167 views

How to create/add features without geometry?

I have a simple SpatiaLite geodb loaded in QGIS with one table. There is a POINT geometry field and some alphanumeric fields. In some cases I can record data about a specific site, but the ...
4
votes
1answer
720 views

postgis error: when adding features geometry has z dimension but column does not

I have to define a geometry column in PostGIS for 2D points, but when I try to import points from DXF to postgres I get the following message: "postgis error: when adding features geometry has z ...
2
votes
1answer
660 views

QGIS Export Color mapped GeoTIFF to GeoTiFF

I've loaded a GeoTiff in QGIS (Single Band), and applied a Color Mapping. I can view it in the map canvas, but I would like to export the entire mapped GeoTiff as an appropriate 3 Band GeoTiff (i.e ...
1
vote
0answers
170 views

How can I merge postcode sector polygons into larger territories in QGIS?

I'm new to GIS so patience might be required :-) I'm building a basic web-based mapping tool for business use, to be used as a demo to show that we need one but managers don't know it yet! So far ...
1
vote
2answers
185 views

Display the outline of many polygons

I need help formatting an outline on a layer. The problem is that i have a layer with this attribute table: And the aspect of this layer is like that: What I need is to show an outline not around ...
1
vote
0answers
188 views

Raster satellite images for QGIS

When I try to apply a downloaded GIS satellite (t=rimage to Quantum, it doesn't seem to open properly. There must be a step-by step description on how this would be done effectively. Can anyone tell ...
5
votes
2answers
969 views

How to sum pixel values within a polygon zone in QGIS?

I have two layers: a raster layer and a vector layer (polygon). I can see the values of the raster pixels but I don't know how to combine them with information from the polygon layer. More ...
0
votes
0answers
17 views

How do I make lines look “continues” (images inside)? [duplicate]

Possible Duplicate: How can I merge segmented roads into one line? A TAB file in MapInfo looks like this : but when I import it to QGIS (and convert to shp) it looks like this : How ...
5
votes
2answers
324 views

How to identify polygons that have shared boundary?

I have hundreds of polygons that represent plants geographical ranges around the globe. For each species I have both a shapefile and collection of findings as points. I would like to analytically ...
2
votes
1answer
563 views

Reprojection from WGS to Slovenian Gauss Kruger in QGIS

I have gpx file (track) in WGS84 (EPSG: 4326) coordinate system from Garmin GPSMAP 62 which is right projected in BaseCamp and MapSource. When I save track as *.GPX and import it to QGIS and use ...
0
votes
1answer
138 views

FieldPyculator Plugin - How to concatenate fields?

How can i concatenate two fields using pyculator plugin? There is any document with all pyculator functions that i can use in "field expression"?
2
votes
1answer
137 views

Is there a difference between ESRI's NAD83 Indiana SPW and QGIS's?

It seems ESRI and QGIS don't have the same definition for my most commonly used projection, NAD83 StatePlane Indiana West (US ft). When I create data in an ESRI product the projection shows up in ...
2
votes
1answer
284 views

Is there lat/lon grid option in QGIS?

For example, I have georeferenced layer loaded and I want lat/lot grid or at least some ruler in QGIS display canvas, to suite me as a helper. It looks like only reference is cursor tracking in status ...
4
votes
1answer
180 views

How to save space in the legend and write the layer name besides the symbol?

I'm starting using QGIS to make a project for university and I am with a problem on configuring legends on Print Composer. The thing is I want the text of my legend to appear after the ...
6
votes
4answers
2k views

How to use Z-Coordinate in QGIS?

I was mapping an area in Namibia and also tracked a lot of paths on my way with my Garmin device... so I thought it would be nice to see height differences in my area (esp. interesting in the ...