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

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2
votes
0answers
433 views

No file is created when I choose 'Save style …' in layer properties

First of all, I create a layer using the Add Delimited Text Layer plugin. The layer contains longitudinal and latitudinal data and a number that is assigned to each data point. When using a graduated ...
3
votes
4answers
5k views

How can I import georeferenced photos (jpg, kml, kmz) using QGIS or ArcGIS for Desktop?

I've got several georeferenced digital photos as jpg, kml, and kmz. How can I import them into my GIS projects (QGIS or ArcGIS for Desktop) so I can open them as a popup?
6
votes
4answers
3k views

How to split a vector in equal smaller parts in QGIS or similar?

i want to divide a shapefile with many tiles into a lot of smaller tiles. I am searching for a smart solution, because manual edits are out of questions Anyone can help or know a nice function?
2
votes
1answer
353 views

How to add USGS DRG WMS to QGIS?

Is there a WMS server, which I can be added to QGIS, that displays USGS DRGs? If so please explain how? Thanks
4
votes
1answer
252 views

Proper work flow to move manholes and pipes to surveyed location

I would like to know how to accomplish the following task using QGIS. I have an existing point shapefile representing sanitary sewer manholes and an existing polyline shapefile representing sanitary ...
1
vote
3answers
2k views

What is the problem with the merge shapefiles tool in QGIS?

I'm having trouble merging shapefiles in QGIS. I'm using plugin ftools 0.6.1 and I get this: Any workarounds someone may know of? Thanks
5
votes
1answer
954 views

How to cite QGIS in publication?

What is the best way to cite QGIS in a formal publication? I mean, what text should be included in the References / Literature Cited section of a paper or report. I'm also specifically referring to ...
11
votes
5answers
3k views

Get Raster Values from a Polygon Overlay in Opensource GIS Solutions

I have two layers. A polygon-shape-layer with many tiles and a raster-layer containing CORINE 2006 land cover with many categories in a colourmap. I want to obtain for each polygon in the shapelayer a ...
0
votes
1answer
312 views

Tiff raster display with polygon layer

Does any body have an idea about why *.tiff images are not displayed when added as raster layer to QGIS after adding a vector layer which has a polygon geometry? SOLVED !! In fact the tiff is ...
2
votes
3answers
1k views

How to use SRTM30 Plus data with QGIS or other GIS tool?

I am trying to access the new Bathymetry data published here: http://topex.ucsd.edu/WWW_html/srtm30_plus.html Is there a way QGIS or similar tool can read these files. Nothing seems to be working, ...
4
votes
1answer
445 views

How to define a CRS using a projection rotated about a given point

I have a data set that uses a common projection, but has its own false easting and northing, and is rotated 315 degrees. I need to be able to work in this CRS and easily translate from one CRS to ...
10
votes
2answers
2k views

How to get FGDB support in GDAL 1.9 without compiling?

I was hoping that I could use the 'master' (nightly-build) version of QGIS to get fgdb support without compiliing (I'm not a developer and frankly have wasted days of productive time trying to get ...
2
votes
2answers
2k views

How to correct a wrong projection of shapefile?

i have a shape file wit UTM zone 16. This projection is wrong. It must be UTM zone 32. How can i correct the projection? When i convert (f-tool) to UTM zone 32, all the vector are rotated. The ...
3
votes
1answer
167 views

Why is the plugin list so short?

i have installed QGIS with GRASS and QDAL complete... I followed the instructions for additional QDAL configuration (adding usr/bin to the QDAL path). When i try to "fetch plugins" my list is short ...
1
vote
1answer
3k views

How to change the projection of a UTM-georeferenced raster in Quantum?

I have a project file in Quantum which contains some shapefiles and rasters that are properly georeferenced. However, I have started using GeoTiffs which are in UTM - WGS84 that don't seem to be ...
3
votes
1answer
1k views

How to split a polyline into points at certain intervals?

I am trying to split a polyline into points with 2m intervals in ArcGIS but I don't have the necessary license. Is there a way that I can do this in QGIS? Context: I have drawn a hypothetical lake ...
0
votes
2answers
193 views

extract edge of a line of a vector layer in a new point layer [closed]

I'm using python to build a plug-in in Qgis. I need to extract the edges of each line feature of a vector layer to create a new point layer of all edges. Someone can help me? My data input is a vector ...
3
votes
2answers
139 views

How can I read the settings for the QgsPaperItem from XML?

I saved a template qpt for the map composer and now I want to read all the settings. I am able to insert the items with composition.addItemsfromXML... But this doesn't load the settings for the ...
2
votes
1answer
309 views

How to add Real Attributes to Shapefile using pyqgis?

I created the Qmarxan plugin using the fTools plugin as an example base. When I create a new shapefile using the QgsVectorFileWriter function I don't have any difficulty specifying a "Real" field with ...
1
vote
1answer
595 views

When I import polygon kml layer, how do I change projection and offset to correct for GMT wrap?

I created a polygon in Google Earth and saved to kml. After importing as a vector layer, where the polygon crosses the prime meridian, the polygon wraps around the world. So far, I have figured out ...
1
vote
3answers
888 views

How to connect the selectionChanged signal with pyqt?

Hi I am developing a plugin for Qgis in python, I need to connect the sselectionChanged signal emitted when a feature of the layer is selected, I could not find any examples on internet, here is what ...
2
votes
2answers
540 views

How to convert Garmin Waypoints to Google Mercator?

I have georef some topocards with QGIS and the Google Hybrid Layer. So, this cards are connected with the Google Mercator System. Now I have some waypoints taken with Garmin GPSmap62 (in WGS84). ...
4
votes
1answer
407 views

Analysing Information By Vector Grid

I have two vector line datasets and wish to compare the line lengths. While I have already compared the sum of the lengths, I'd like to conduct further analysis down to 250m, possibly lower. I'm ...
2
votes
1answer
584 views

How to get the layer list back?

Sorry for the probably stupid question, but I closed a side panel I had, where I had a list of layers and which I used to switch on and off layers, and I cannot find how to get it back. I have tried ...
8
votes
1answer
1k views

How to split non-contiguous feature in QGIS?

I have a shapefile with a feature that is non-contiguous. I want to split the areas on the left from the area on the right. However, QGIS's Split Features tool requires you to draw a line over the ...
6
votes
2answers
8k views

How to export Polygons to CSV with coordinates?

I am very new to QGIS, so please bear with me. I have a ".shp" file, which is contains a set of boundaries for suburbs of Australia. I opened it to QGIS and I would like to export it into a CSV file ...
1
vote
2answers
205 views

How to fill “shapefile name” and “name of attribute”?

When I try to create a shapefile two of the boxes to fill in are "name of the attribute" and " shapefile name". this may be very basic but I can't find and answer. I want to fill them in correctly. ...
20
votes
2answers
19k views

How to calculate polygon areas in QGIS?

Hi I would like to simply calculate areas of a area-shape file in square meters or in acres (ha). I didn't find that functionality in the vector tools. Could anyone here help me with that?
2
votes
1answer
310 views

Why does Table Manager not work?

After installation of Quantum GIS I tried to use Table Manager Module, but I can't do it. Here is the message: Nem tudom betölteni a 'tablemanager' modult innen: ['C:/PROGRA~1/Quantum GIS ...
3
votes
1answer
371 views

Sum up area left “underneath” polygons in QGIS?

I have an area shape layer and multiple other area shape layers. Now I would like to calculate how much space (square kilometers or percentage of area) of the polygons of this area layer is NOT ...
2
votes
2answers
357 views

How to make QGIS recognize EPSG:31468?

I have Shapefiles without a CRS (e.g. without .prj-file). I would like to set the CRS (EPSG:31468) before I pass the shape-files. I tried the following: 1. Setting a .prj-file manually with the string ...
4
votes
3answers
1k views

How to Clip a Vector File based on certain Raster Values?

I need to clip a vector file based on certain values of a raster (Slope > 2%). I can´t find a direct way to do it. Trying to vectorize the raster first didn´t work. Is there any tool (ArcGIS or ...
3
votes
3answers
521 views

Is there a “Tabulate Area” function in QGIS?

I have a raster file about land usage in northern italy (crops / urban areas ecc..) I have defined some buffer zones around some given points of a vector layer and I'd like to calculate the % of ...
5
votes
2answers
401 views

How to reset MacOS QGIS to defaults?

I can't find a way to clear away all imported QGIS styles, even completely removing all QGIS files, after new install - old styles are still there. Where to look? Removing one by one is the only ...
2
votes
1answer
1k views

QGis failed with error: latitude or longitude exceeded limits

I have some shapefiles from vegetationtypes in QGis and i wanted to put a googlemap in background, so i installed the open layers plug in. But every time i tried to load the map, theres an error ...
1
vote
2answers
525 views

How to install Sourcepole zonal statistics

I am trying to install the zonal statistics tool created/supplied by sourcepole from http://www.sourcepole.com/2010/12/16/zonal-statistics-plugin-for-qgis. The instructions area as follows: **To ...
2
votes
3answers
1k views

Qgis Python code library documenation.

I'm looking for python documentation for specific operations in the Qgis python console. I know there is no suggestions simular to Arcpy but I would like a pure list of operation code lines as ...
4
votes
2answers
797 views

How to make line width scale-dependent

Is there a way to tie line width to map scale in QGIS? All I found was an outside limit for display as the scale decreases. I'm using an outline line style for roads, and the roads are too big when ...
1
vote
2answers
773 views

How to calculate the average value of a raster within polygons?

I am using the GRASS plugin in QGIS. I am trying to calculate the average value of a raster dataset within a set of polygons. I have created a new mapset and have imported both the vector and ...
7
votes
3answers
4k views

How to calculate raster statistics for polygons?

how can I calculate sums, averages etc of raster-points (multi-band) per polygon of a vector-layer. I was told that this is called "zonal statistics". I tried that with QGIS first. There is a way to ...
1
vote
1answer
258 views

Is there any support for Rasterlite in the Android QGIS?

Is there any support for Rasterlite databases in the Android port of QGIS? I have tried adding a raster layer as I would on desktop QGIS but there are fewer GDAL file formats listed. Is this ...
3
votes
2answers
751 views

Generate non-overlapping shapes from a buffer

I have a collection of points, and I need to generate shapes around these points. Let's assume that these points are locations of offices and that the shapes are the 'area of responsibility' around ...
3
votes
1answer
182 views

How to create a point layer from a one-to-many join?

I have two layers: One with geographical coordinates containing every address in the county and a unique identifier. The second contains a list of incidents with the unique identifier from the ...
0
votes
1answer
408 views

shapefile and multiple lines of census data QGIS [duplicate]

Possible Duplicate: How to join multiple records to single feature? I am hoping to be able to link in the attribute table more than one line of data from a census entry per polygon. for ...
7
votes
1answer
406 views

What are the rules that the Gdal rasterize function follows to allocate a value to a cell?

How does the rasterize tool decide which value to represent when a cell covers an area which inclueds different values? I need it in this case for polygons but would like to know for lines and points ...
1
vote
1answer
311 views

How to get a legend for a WMS layer and search in it?

How to bring legend and search for WMS layer in QGis? I can see the WMS layer in Qgis but can't make any legend for identifying feature types and searching in WMS layer?
2
votes
2answers
419 views

Which labelling tool/engine in QGIS will be supported in the long term?

Why does QGIS appear to have two labelling tools? (Note this is not new and old symbology, but that...) there are two different GUIs, one in the toolbar (which gives the Data Defined Settings option) ...
2
votes
3answers
859 views

How to search feature in Qgis?

How is it possible to search feature on Qgis? I have lots of points with Id. Is is possible to search points using ID? Update: I'm looking for a solution that centers the map to that point.
1
vote
0answers
602 views

SDA4PP not found? How to do Kriging in QGIS?

I need to make kriging analysis in QGIS (v1.7.4). I found out, that it should be a part of SDA4PP plugin, but I just couldn't find it in any repository (even third party). It looks, like it just ...
3
votes
2answers
388 views

How to get the layers of my project to show while tracking with GPS?

I've been using/testing several versions of various GIS software and run into occasional issues. Right now, my biggest with QGIS is with GPS connection/downloading from/tracking. These are all ...