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

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2answers
869 views

GDAL does ECW but QGIS (Linux !!) does not load ECW file

Followed instructions from various posts (each one with slight variations on the theme) and most of the time have no trouble getting the installed GDAL to accept ECW files. However, QGIS stubbornly ...
3
votes
0answers
234 views

Why do our .shx files disappear?

We are using QGIS in our workgroup, and have recently updated to 1.8.0 Lisboa. To share our file structure we are using egnyte similar to dropbox. We all use Mac OS, and have used QGIS for years, ...
8
votes
0answers
257 views

Solutions for fast operations on large GIS datasets [duplicate]

Possible Duplicate: Acquiring ArcGIS-like speed in Postgis I have been using PostGIS 2.0 for all of my GIS operations. PostGIS is an excellent GIS database, but no matter how I format my ...
7
votes
1answer
801 views

How to add a toolbar via python?

Through tutorials I learned how to add a toolbutton to the plugins-toolbar via python. Now I wonder how to add a complete toolbar with toolbarbuttons via python. Can anybody give some example-code? ...
0
votes
1answer
86 views

Set QGIS (on android and/or linux) to use a custom .qgs file by default when opened.

Need to have QGIS open with all my settings/layers/projections etc by default. Created a .qgs file that has all this info in it. Using Android and Ubuntu. Tried a shortcut to the .qgs file in ...
2
votes
3answers
1k views

Is it possible to export GeoTIF current view to GeoTIFF with QGis?

ArcGis offers this, but I didn't found such a function in Qgis. Maybe I have simply not found the command.... Does someone know the command or is there an extenstion which offers such a functionality? ...
1
vote
2answers
1k views

old project on new PC: bad allocation when opening

Just got a new laptop (windows7). When opening a qgis project (shape layers on server), I get an error window "bad allocation. Project was made in Wroclaw, new PC has Lisboa. any suggestions?
2
votes
2answers
622 views

How to install DTclassifier for QGIS?

I want to install a dt-classifier plugin I have downloaded from a web page (http://gis-lab.info/qa/dtclassifier-eng.html). I unzipped it to the qgis plugin directory but it won`t show up in my plugin ...
1
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1answer
474 views

How to disable on-focus “scrolling” of dropdownlists in QGIS forms?

The dropdownlists in QGIS form has an advanced action behaviour i.e. the items in a dropdownlist are getting scrolled while we scroll the mouse wheel by focusing over the control. I don't want this ...
0
votes
1answer
135 views

Why are WMS layers not loading on new computer?

I've created a QGIS project that makes use of WMS layers. I'm sharing the project with many other computers. However when I load the QGIS project on those computers, the wms layers do not load. even ...
4
votes
1answer
423 views

How to specify coordinate reference system (CRS) for scalebar that is different to project CRS?

Is it possible to specify a coordinate reference system (CRS) for the scalebar that is different to the project CRS? For example, my project CRS uses geographic coordinates (lat/long), the reason ...
4
votes
2answers
479 views

How to find isolated geometry/attributes in road network?

I have a road network with paved/unpaved status in attribute table. This road network don't must contain isolated paved geometry. There are any solutions find isolated geometry in GIS software ...
3
votes
0answers
1k views

How to open a file geodatabase with tables and relationships in QGIS?

How can I open or connect to an ESRI file geodatabase in QGIS? I don't want to only see the features (shapes), I want to make sure that tables and relationships are opened correctly, too. Thanks in ...
2
votes
1answer
472 views

OSM data, line and polygon confusion

Taking some OSM (*.osm) data downloaded from Geofabrik I have created a Spatialite database using spatialite_osm_map. Now I have problems, because some of the data that is supposed to be in the form ...
3
votes
2answers
6k views

Create polygon layer from polyline layer

Our systems expect polygon shapefiles, representing a collection of non-intersecting and geometrically valid (multi)polygons. Specifically, farm fields. We often receive our representations of farms ...
4
votes
2answers
781 views

How to handle Arabic letters in QGIS and Mapinfo?

I have a problem with Quantum GIS and Mapinfo, in both Windows XP and Windows 7. I need to use French and Arabic. One field is called Name_fr, and the other Name_AR. The Arabic is fine until the ...
2
votes
1answer
1k views

Are there any known problems using QGIS on Mac OSX Mountain Lion?

A few days ago Apple released a new version of the OSX (10.8) and I'm thinking about upgrading. So, I was wondering if anyone had any problems with GIS applications (QGIS) and other similar software ...
0
votes
1answer
451 views

How to select multiple features using advanced search SQL in QGIS

I have a layer of planning units covering a large area (there are over 16000 PU's). Three of the columns in the attribute table hold information about which planning units were included in the ...
0
votes
1answer
134 views

How to edit a group of selected features in QGIS?

I am dealing with a large number of planning units across a very large study area. I am selecting a number of features using the advanced search in the attribute table, and would like to edit them ...
0
votes
1answer
120 views

QGIS - Unable to get OSM data on re-opening project

I have now successfully got OSM maps to import as I would like, but if I save the project then later re-open, I always get a bad layer message and I have to reload the OSM once the project is open. ...
2
votes
1answer
636 views

How to query attributes cross-table in QGIS?

is it possible in QGIS to query a layer with data from another layer? And if so ... how is the syntax for that? Usecase: I have a lot of image-position points and a lot of monitoring sites. I would ...
7
votes
1answer
207 views

Jitter or Randomise Points in QGIS

Occasionally I'm asked to plot points that relate to sensitive data items. I would quite like to be able to add a varying level of random jitter to points when plotting so that point density is still ...
4
votes
3answers
785 views

How to split features?

I would like to split a shapefile in qgis according to how the polygons overlaps. Don't know how to though? See pic for explanation:
1
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1answer
1k views

Export georeferenced image into Google Earth

I have created a georeferenced image as instructed in this fine tutorial: http://qgis.spatialthoughts.com/2012/02/tutorial-georeferencing-topo-sheets.html Now I would like to get this image into ...
1
vote
2answers
685 views

Setting OSM map data to aerial view in QGIS

I have just started playing around with my first GIS package, QGIS. I have successfully used Ordnance Survey Vector data to create maps but when I try importing maps from an OpenStreetMap export it ...
2
votes
1answer
278 views

How to use ECWP protocol with QGIS?

Is there a way to retrieve remote data through ECWP protocol in QGIS? I've read that .ecw files can be opened with QGIS, but haven't found anything concerning this particular protocol and QGIS.
2
votes
1answer
1k views

Why is my .prj file not being read by QGIS?

First off, I am new to GIS. I am using qgis (1.8.0), and have been given a shapefile containing .shp, .prj, .shx, .dbf, however qgis will not load the .prj file stating an invalid data source. ...
7
votes
1answer
198 views

Why is there a black hole in the Heatmap?

After running the Heatmap tool in QGIS I like to color the geoTiff according to my wishes. Using Psuedo color works fine, but it leaves me with no options, as type of color scheme or transparancy on ...
1
vote
1answer
259 views

How can I move diagrams?

Is there a way to locate diagrams and move them wherever you want in QGIS 1.7.4/ 1.8.0? I created a pie chart under the tab "diagram". I can mark those diagrams with a green box and move them via the ...
4
votes
1answer
864 views

Quantum GIS Affine

I have a vector floorplan (DXF) that I've added to a blank project in QGIS using the Dxf2Shp plugin. I've been reading tutorials and StackExchange threads, but I can't seem to find out how to ...
1
vote
3answers
453 views

How to start QGIS after building & install on ubuntu 12.04 64bit?

I am a newbie here. I am running ubuntu 12.04 64bit, and build after the instruction, but i don't know why can not launch qgis. Seem i successfully build $ install it. below is the linux shell: ...
3
votes
1answer
1k views

Why does QGIS show too many labels per feature?

When i check to label polygon feature, one out of a total five polygons shows like 10 labels on top of it. That particular polygon is only one polygon, represented by one row in the table, so i dont ...
2
votes
1answer
98 views

Are there any mirrors for QGIS documentation? [closed]

I have tried several times today (July 30, 2012) to connect to www.qgis.org (to get the online documentation). The site seems to be down. Do you know if there is a mirror to obtain the Lisboa (1.8) ...
5
votes
4answers
6k views

How to export/save a layer composition to GeoTiff?

I want to export/save a QGIS composition of raster/vector layers to a GEOTIFF or ECW raster with high resolution (20 000 * 20 000 Pixel).
4
votes
2answers
836 views

GeoTiff size - what to do?

I have a whole series of GeoTiff tiles, each one about 250mb in size, in total just over 90gb. I want to be able to display these as a wms into QGIS to 20+ GIS users and in the end make them into a ...
2
votes
3answers
2k views

Problem with spatial reference system / shapefile projection

I am new to using QGIS and having some problems getting some shapefiles to project correctly. I am using publicly available shapefiles for New York City municipal boundaries found here: ...
8
votes
2answers
988 views

How can I create random points along a polyline in QGIS?

I am trying to create random points along a polyline shapefile in QGIS. Basically, like the 'random points' tool in 'research tools' but for polylines instead of polygons. I have tried converting ...
1
vote
0answers
326 views

Stats problem, QGIS heatmap [closed]

I am new to QGIS 1.8 and have been trying to make a heatmap. From what I can tell, the reason I am not getting the results I want is that the max value of the raster is erroneously measured at 2. ...
3
votes
2answers
2k views

How to split a line at point positions?

I am a rooky with QGIS and i am stuck from a basic problems. I have a polyline and i have some points (2) on the polyline. I would like to know if there is a tool or script that i could use to ...
3
votes
2answers
3k views

How to fix “The entry point for the procedure sqlite3_open_v2 cannot be found in the dynamic link library sqlite3.dll”

Translation: Hello, I have a problem installing version 1.0.8. The following error message appears: The entry point for the procedure sqlite3_open_v2 cannot be found in the dynamic link library ...
7
votes
1answer
3k views

Open a GeoJSON file with QGis

If I have a GEOJson file, for example a file named test.js with inside the following: { "type": "FeatureCollection", "features": [ { "type": "Feature", "geometry": {"type": "Point", "coordinates": ...
1
vote
1answer
127 views

Where is Quick Print for QGIS 1.8?

Just installing Qgis 1.8 Lisboa, i can't find "Quick Print" Extension. Any idea where to catch it again ? Thanks Jean
7
votes
1answer
2k views

Using PostgreSQL with QGIS and ArcGIS?

Is it possible to use PostgreSQL with QGIS and ArcGIS? i.e. one database for different clients. Is it anything that I have worry or any problems to use the DBMS from two different software? I know ...
2
votes
1answer
1k views

How to export vectors from QGIS to MapInfo?

I am trying to save some vector lines that I made in QGIS (1.8 Lisboa) to a format that can be added to MapInfo Professional 6.0 (ancient version I know..). When I save the vector to a Mapinfo ...
5
votes
4answers
3k views

Advanced colour palette for raster data

I'm working with satellite date namely chlorophyll and sst. Each geophysical parameter generally has standard colours to represent them. I'm importing geotiffs into Qgis and I'm having difficulty ...
2
votes
1answer
382 views

polygonize and raster tools [closed]

ok simplest question i have asked i think. but im a running QGIS 1.7.4 and there are no other tools in the dropdown menu other than raster calculator. I have seen in a lot of online demos tools below ...
2
votes
1answer
174 views

QGIS Console error Libgrass

Just installed QGIS 1.8. on Mac OSX Installed GSL Install GDAL 1.9 Complete Installed QGIS keep getting this console error message in QGIS. Failed to load ...
1
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0answers
212 views

Problem using addVectorLayer() in Qgis

I am confused a bit, using addVectorLayer() in QGIS plugin. I want to add and display a vector layer, directly when QGIS opens. Hence I am using addVectorLayer() in _init_() function of my plugin. ...
0
votes
2answers
469 views

how to create gis like Uster?

I downloaded qgis, geoserver, openlayers, ext, geoext, qgis-web-client and osgeo. And i have map shape files. i would like create website like this site. i need help. can you send tutorial links thank ...
3
votes
2answers
3k views

How to create a lat/lon grid in QGIS?

I'm using QGIS. How can I create a shapefile consisting of a grid 0.5° latitude and 1° longitude in size?