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

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3
votes
1answer
732 views

Hyperlinking in QGIS - Add Data to current window

I am looking to add to my current action in QGIS so that a hyperlinked file will open in the current QGIS window, rather than in a new window. Here is what my action looks like: "C:/Program Files ...
1
vote
0answers
103 views

How to maintain schema when copying feature from layer 1 to layer 2, where both layers have same schema?

If I load two unique layers, wherein each layer contains unique data, but both layers share the exact same schema, why is it when I copy a feature from layer 1, and paste it into layer 2, the ...
3
votes
2answers
592 views

Why does the attribute Table not maintain input data?

for a longer time I have a problem with the attribute table. I create the polygons on the map, I fill up the table with attributes. Then, if I click "save", all the data from the table are being ...
3
votes
4answers
3k views

How to ceate a point layer from a table in PostGIS?

I have a table in PostgreSQL(postgis). This table has latitude and longitude values in it. Now I want to plot these point in qgis. The only thing I could get done was connecting to the database from ...
2
votes
1answer
1k views

How to open existing sqlite DB in QspatiaLite plugin?

Using QspatiaLite plugin in QGIS I'm able to create a new database and work with it (load/edit/import/export data). But how can I add a connection to an existing database? How to add an existing ...
15
votes
1answer
1k views

How to load Ordnance Survey OpenSpace in QGIS?

The version of gvSIG that I have on my Android tablet will load OS OpenSpace layers and I wonder whether or not it would be possible for QGIS desktop to do the same? And if so, how? I have my own ...
10
votes
1answer
7k views

Understanding QGIS buffer tool units?

I have been trying to figure this out for a couple weeks now and have had no luck getting the buffer tool to accept anything but degrees as units of measure. I have found lots of stuff saying the ...
0
votes
0answers
32 views

Re: QGIS - Select Feature gives nonsensical results [duplicate]

Possible Duplicate: QGIS - Select Feature gives nonsensical results Thank you for your replies. To address some points raised, firstly in the attribute table I don’t see a ‘show selected ...
1
vote
1answer
1k views

How does “Show only visible features” work in Map Composer?

If I tick show only visible, I get no features. I have created an attribute table in the Map Composer in QGIS trunk QGIS version 1.9.90-Alpha QGIS code revision 4d6cc6d I note recent feature update ...
1
vote
1answer
221 views

Python27 in Quantum GIS is missing SQL drivers in PyQT4

I am developing a QGIS plugin and need to create a table view in my GUI that I have been designing with QT Designer. I have PyQT4 installed but I have noticed that I have 2 Python directories. I have ...
1
vote
1answer
389 views

Why does Select Feature give nonsensical results?

I am a beginner with Quantum GIS and with no previous experience or expertise in Geography or GIS. I have an ESRI shapefile of New Zealand census area units (CAUs). My goal is to obtain distances ...
1
vote
0answers
160 views

qgis rgb raster layer: min/max-values definied by user not working?

I tried several times to define the min/max-values for the rgb-display under properties>style: Benutzer min/max-Werte (user min/max-values) but it is not working. By chance it worked once but now it ...
3
votes
1answer
6k views

How to add points to a point vector layer - QGIS

I have a point layer with multiple data points in QGIS, but I want to add some extra data points to it and adjust some info that we missed because the ground was wet and we needed to go around it. I ...
7
votes
2answers
5k views

How to move labels in QGIS?

I'm trying to manually move labels but having some trouble. I'm trying to move the labels while in edit mode. I've added fields for x coordinate (all null), y coordinate (all null), rotation (all =0), ...
23
votes
3answers
17k views

How to convert ArcGIS .mxd file to QGIS .qgs file?

I recently tried to use QGIS and I wondered if you can convert a draft ArcGIS map (*.mxd file) into a QGIS project (*.qgs file). This would avoid thematize the entire project.
6
votes
1answer
1k views

What sampling tools are available in QGIS?

I'm looking for a tool to generate a stratified random set of points within the boundaries of a polygon layer. In ftools 0.6.1 there is a tool which almost does what I need, but misses the stratified ...
2
votes
1answer
658 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
9k 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?
7
votes
4answers
5k 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
716 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
279 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
6
votes
2answers
2k 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 ...
12
votes
5answers
4k 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
408 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
2k 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
598 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
3k 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
184 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
4k 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
2answers
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
274 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
180 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
369 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
870 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
1k 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
589 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
441 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 ...
3
votes
1answer
2k 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 ...
9
votes
2answers
2k 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 ...
8
votes
3answers
15k 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
239 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. ...
22
votes
2answers
35k 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
362 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
451 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 ...
3
votes
2answers
480 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 Shapefiles. I tried the following: 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 ...
4
votes
3answers
949 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
508 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 ...