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

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852 views

Deleting points that fall outside a polygon

I have a polygon that is my region of interest. I also have a database of observation points that I have imported into QGIS as a points layer. I'd like to exclude all the observation points that ...
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1answer
428 views

What's the correct transformation for Lambert Conformal Conic for Mexico?

I have a shp archive without the .prj file. I don´t know the proyection of this shp, but I think it is in lambert conformal conic. Can anybody helpme to proyect this shp? i´ve tried to proyect it in ...
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1answer
267 views

How to install two versions of Qgis on Ubuntu 12.04?

I would like to run multiple versions of QGIS on Ubuntu 12.04. Can I do that, and how if so?
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1answer
192 views

opening older 9.x Esri .gdb in QGIS?

I want to open an Esri .gdb with QGIS. I have adjusted GDAL and it works fine with an example .gdb provided on another thread on the topic. I still cannot open the .gdb of interest to me and suspect ...
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3answers
151 views

How to search for several different features in the attribute table?

I guess my problem is a quite simple one, but the query builder and I have our difficulties, so maybe someone can help me. I have a long attribute table in QGIS and am trying to extract about 200 ...
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1answer
178 views

Why does QGIS generate Shapefiles without DBF?

I need to output shape files for archiving, which requires generating .shp, .shx and .dbf files. When I save a layer as a shape file it generates the first two, but not the dbf. All the help I can ...
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2answers
365 views

How to add a dynamic timeline to the QGIS canvas?

I am using the plugin Timemanager which works really great but there is one thing I'd like to improve. Instead of displaying the date and time on each frame, I would like to display a timeline ...
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2answers
183 views

Is it possible to change CRS without the .prj file?

I'm working with QGIS and trying to change the CRS of some maps. Is is possible to do it without the .prj file? Please let me know. Thanks.
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1answer
1k views

QGIS on Windows Surface

I was wondering if anyone has had any success running QGIS on the Windows Surface tablet? Specifically with the Windows RT OS. Thanks...
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1answer
310 views

clip one layer with the current map layers

I work in a little companie where the main goal of employees in GIS is to have a quick view of the issues on a study area. It would be very useful to have a tool wich clip all the layers of the ...
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3answers
798 views

Why can't I open postgis layers in QGIS?

I've set up a table in PostGIS using OSM data (converted using osm2pgsql). I know this database is good, because I'm able to import it and work with it in TileMill, but whenever I try to interact with ...
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1answer
337 views

Connect not working for custom QGIS form

So I have a custom form for editting feature attributes. However, I can't seem to correctly disconnect and reconnect certain bindings. The init code is below and should work for any simple QT widget ...
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1answer
41 views

How to handle a UnicodeEncodeError with sampling tool?

I'm using qgis and I keep getting an error when using the point sampling tool, its keeping me from getting the sampling done. Does anyone has an idea what is it about? Thanks!
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1answer
262 views

What is the correct coordinate system for google geocoded text file layers?

When importing a text file containing lat/longs geocoded from something like GPSVisualizer.com into QGIS, what is the correct coordinate system to select? Most web services (GpsVisualizer included) ...
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2answers
95 views

How do I adjust transparency on heatmap so that I can see background raster map? QGIS 1.8.0

I have created a raster heatmap for the first time, but I cant seem to adjust the transparency settings to let me see another background OS raster map beneath it. I have attempted to swap the ...
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1answer
2k views

How to search text string and select item in QGIS?

I have a table attribute with complete roads name. I have to search items by digiting a part of the road name and I need to colour all the items selected. eg: ROAD NAME: / road 01 / road 02 / road 11 ...
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1answer
188 views

Failed connection with .sqlite file in QGIS converted from osm by spatialite

I have converted a *.osm file to a *.sqlite file using the spatialite_tool i.e sspatialite_osm_map.. Now I want to view the map using QGIS. However, at the time of using the add spatialite table ...
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2answers
190 views

How to modify the results of a geological dataset from vertical to horizontal?

I have a 3-D point shapefile of a geological fault dataset consisting of x,y, and z columns. I need to create a raster dataset from this point dataset. I have been trying to do this in ArcGIS; ...
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3answers
2k views

Saving of multipolygon shape file into a individual polygon shape files [closed]

How to seperate a multi polygon shape file into individual polygons(as seperate shape files)? i had huge data... I know the traditional process like export data... Please help me.. Thanks in Advance
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1answer
355 views

JSON URL won't open in QGIS

When attempting to display the national chargepoint registry from the following URL: http://chargepoints.dft.gov.uk/api/retrieve/registry/format/json The following error returns: ...
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1answer
304 views

QGIS Dev install issues

I need to use some of the new functionality in the Dev build and just can not install it on our windows 7, 64 bit machines. It works fine on my personal windows 8 laptop but I can't get it to work at ...
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1answer
905 views

How to create histograms

I am very new at using GIS data and in particular QGIS (1.7.3) and I need some help to produce histograms regarding my data. I have a great number of data about an algae density collected in 8 ...
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1answer
77 views

Drag zoom in Quantum GIS missing?

There are like ten zoom-tool icons but no one seems to do what I look for - to zoom to a rectangle that will be created by dragging mouse from top left corner of it to bottom right corner of the ...
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1answer
452 views

Which CRS fits “Lambert Conformal Conic Projection, Standard Parallels 46.40 and 49.20”?

I am trying to georeference a VFR chart in qgis and I can't figure out which CRS to use. Map projection - Lambert Conformal Conic Projection, Standard Parallels 46.40 and 49.20. Any ideas which ...
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2answers
386 views

Easy Custom Labeling plugin does allow to save?

I use the Easy Custom Labeling plugin chose positions of the labels and safe the layer and project for continuing later. When opening again the project, the layer opens but without any objects inside. ...
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2answers
181 views

How can i mark movement route to the map with QGIS?

I am beginner with QGIS and i am having problem with marking movement route to the map. So i would like to ask how can i mark movement route to the map with QGIS. I have a list of cities and i have to ...
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1answer
914 views

How to set Marker Line symbol for QgsVectorLayer by using Python?

QgsVectorLayer Right click->Properties->Style->Single symbol->click on simple line in tree node ->symbol layer type -> Marker line Kindly help me to set marker line symbol programmatically by using ...
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1answer
220 views

What are use cases of Esri's CityEngine?

I would like to know the use cases of Esri's CityEngine, and what distinguish this tool from the other standard GIS like ArcMap and QGIS? and in which fields could be used ?
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2answers
467 views

SAGA, GRASS Raster values to null

I want to make the cells which values "1" to null in QGIS with Grass or Saga tools (exactly Saga).
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2answers
463 views

area values determined with field calculator become null when saving

using field calculator in Qgis 1.8.0 to get the area, it shows just right at first but when I save it, the values become Null. help please
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1answer
83 views

How do I get a decent easy to use watermark from an image in Quantum?

Our users need to be able to put a graphic watermark onto maps they create in the print composer. Currently we get them to georeference the image as a raster and then create a transparency. This is ...
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1answer
916 views

How to create a 3D shapefile from a raster?

I´m trying to make a 3D shapefile from a raster feature but not working. Tried already to run the command in OSGeo4W but nothing happen. I'm using the Qgis 1.8.0 Lisboa. The purpose is to get a final ...
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1answer
853 views

QGIS python location problem

It seems that MacPorts installs Python27 in /opt/local, but that MacPorts QGIS updates and uses the Apple Python27 in /Library. The result is that MacPorts additions to Python27 such as OpenCV don't ...
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1answer
506 views

How to install TimeManager for QGIS?

I'm trying to install TimeManager for QGIS. I can't find it under Plugins/Fetch Python Plugins and I have verified that the official repository is listed in the Plugins menu, so I'm wondering if ...
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1answer
223 views

How to apply DEM elevation adjustment parameters?

I have a nice DEM, created from UAV data, which I want to process further in QGIS, my platform of first choice. In order to represent the evelation of each pixel correctly, I have to adjust the ...
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1answer
296 views

Is there anyway to modify thickness & color of a selected polygon?

QGIS - version 1.8.0. Is there anyway to modify the thickness and color of a selected polygon (Select Single Feature)?
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1answer
251 views

How to center the labels in QGis?

I have a shapefile containing some US sections from the Public Land Survey System. I would like to display the labels in the middle of the sections. I found the "Placement" option in the "Label" ...
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2answers
456 views

Having problems creating VRT in QGIS from png files

This is similar to a question asked by someone else, re OS tiles, however, there is a difference! I am a bit of a amateur in GIS and python, but if I take it slow I can usually just about work it out! ...
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1answer
707 views

how to install networkx python in QGIS

How to install and how to compile networkx python on QGIS? I always get an error that no module named networkx in the console of QGIS I copied the file networkx in C:\Program Files\Quantum GIS ...
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1answer
155 views

How to reproject base layers in QGIS once open layers are removed?

I recently discovered the wonders of the osm maps. however now all my projects have all gone curved. is there a way to go back to how they were set originally. opposite to this question: How to ...
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2answers
600 views

Where are Print Composer Template files stored?

When I saved my Print Composer template, I cleverly navigated to a logical (to me) folder among my documents to save it. Now I find that it does not show up on the list of Composers under “File”. Can ...
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1answer
401 views

matching georeferenced jpg with GPS data in WGS84 [closed]

I have imported my georeferenced jpg which I believe (on the basis of metadata in xmml file) to be in the NZGD2000 TM coordinate system. metadata: Origin: 1.76759e+06,5.94938e+06 Pixel Size: ...
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1answer
137 views

Looking for complicated representations of an urban areas

I would like to display some features of an urban area using a map, showing something like telecomunications, roads, or parks, etc. Also, is it possible to get an understanding of how to show more ...
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1answer
84 views

Road number boxes dependent on string length?

I would like to have a coloured box behind each road number on my map, matching the colour of the road it relates to and scaled to the length of the road number. I understand this could be done with ...
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1answer
491 views

Can a QGIS project (.qgs) be uploaded to work in map viewer in GIS Cloud?

Title says it all. Can a QGIS project be uploaded onto GIS CLoud to display all the properties i have asked it to display in QGIS? if not is there an equvilant GIS Server i can upload previous QGIS ...
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1answer
92 views

Have editable label locations (dynamic) on a layer on which there is query

Is it possible to have dynamic labels, set by editable x y parameters in the attribute table, on a layer which also has a query applied, in QGIS? i.e. I want to set the query and get all the ...
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2answers
504 views

count lines in polygons

I found the following link to a post saying that a count lines in polygons had been added to ftools for QGIS: http://hub.qgis.org/issues/4712 However I can't find how to access this feature nor any ...
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2answers
483 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 ...
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1answer
515 views

How to add rasters of different sizes with Arcmap or Qgis raster calculators?

I've got 8 rasters all of different sizes. What is the proper syntax, for the raster calculators of either Arcmap or Qgis, that will output a raster that covers the extent of all my data not just the ...
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1answer
452 views

How to convert images from the South African co-ordinate system to WGS84 lat/long?

I have a number of orthophotos for an area in South Africa, but they are projected in the South African co-ordinate system which measures a location in meters from a central (uneven) meridian. These ...