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

learn more… | top users | synonyms (1)

1
vote
2answers
142 views

QGIS raster calculator using abs() function

Is it possible to use the Abs() function in the raster calculator in QGIS? I've tried it, but it didn't work.
1
vote
1answer
179 views

How to convert float to raster in QGIS

I have downloaded bathymetric data into QGIS. In order to use it I need to conduct a float to raster conversion. I have not been able to find how to do this on any of the forums. I have unsuccessfully ...
1
vote
2answers
391 views

Export polygon in geojson as multipolygon

Anyone knows if is there any way to export a polygon layer in geojson, as multipolygon? I have a multipolygon shapefile. But there are single and multi polygons. When I export it to geojson, I got ...
1
vote
1answer
361 views

OpenLayers does not appear in the QGIS plugin menu [duplicate]

I have installed the OpenLayers QGIS plugin, which features external map layers in QGIS. Quoting the official page: OpenStreetMap, Google Maps, Bing Maps layers and more In QGIS, it seems that ...
1
vote
1answer
79 views

How can I fix a broken gdal-tools plugin in QGIS?

I have QGIS installed on my 2011 macbook pro and I recently upgraded my OS to 10.9. After the upgrade, I noticed that QGIS gives me this error (see attachment 1) saying that the plugin is not ...
1
vote
1answer
86 views

How to use bold text in QGIS font marker symbol?

Is it possible to use bold text with the Font marker symbol in a QGIS (point) layer?
1
vote
2answers
338 views

How to create spline in QGIS [closed]

I want to create spline in QGIS. I have tried to use Cad-tools - Create spline line\poligon but I can only draw it and can't save. What is wrong I am doing? Is there other way to create spline?
1
vote
1answer
69 views

Accessing pgsql db set in cygwin from qgis installed on windows through osgeo4w, possible?

As the title of this question, I want to know if it is possible to access a PostgreSQL database set in cygwin (version 9) from QGis installed in Windows 8.1 through the OSgeo4W application, is that ...
1
vote
1answer
146 views

How to delete column/field in PyQGIS?

How to remove or delete column fields in a shape file using python?
1
vote
1answer
73 views

Apply new style to selected features in QGis

Let's assume that I have selected some features in QGis. Now all the features in that vector layer already has some style applied to it. Now, I want to apply some new style to the selected features. ...
1
vote
1answer
77 views

Have Atlas sorting and filtering controls been removed in 2.4?

In this diagram the atlas generation tab of the print composer has several controls that I don't see in my version (2.4) of QGIS. In particular the feature sorting and feature filtering, both of ...
1
vote
1answer
55 views

What's the difference between Processing GRASS and the GRASS toolbar?

Preparing a QGIS-course for my colleagues I stumbled over the following question: What is the difference between the GRASS commands in the processing toolbar and the GRASS Tools, that you access via ...
1
vote
1answer
133 views

Is there a gallery of QGIS maps anywhere?

Specifically, I want to see the gorgeous map of Chugach State Park that you see when starting QGIS 2.4 "Chugiak". Is there a website out there where people share maps? I would like to share and see ...
1
vote
1answer
110 views

Where can I find AniMove in Qgis2.4

I have sucessfully installed AniMove by activating experimental plugins (yay! thanks gis.stackexchange). But I can't find it in Qgis! Yes I have activated it. Where is it? Is this a common bug? I ...
1
vote
1answer
64 views

Why does QGIS add decimals when a csv is saved as a shapefile?

When I save a csv as shapefile the fields with decimals are saved adding decimals, then the new table in some case has new values. Old Table (CSV) ALTURA ELI ALTURA ORT 1.94 39.6 -11.19 ...
1
vote
1answer
324 views

How to handle “illegal data type (Float64)” error when trying to convert .tif to .bil?

Each time I try to convert (in QGIS 2.2) an elevation model from .tif to .bil format a get this error: ERROR 1: Attempt to create ESRI .hdr labelled dataset with an illegal data type (Float64). ...
1
vote
1answer
164 views

How to interact with other layers in a QGis Python init function?

I am using QGis and making a Python script that sets the Python Init function to a custom UI file. I have a function with the following signature: def formOpen(dialog, layer, feature): ... I ...
1
vote
3answers
162 views

How to complete the roads output of PostGIS?

I converted the file I exported from OSM to PostGIS using osm2pgsql. I have opened the table's outputs to QGIS and I saw data are not complete compare to OSM editor view. Most of the roads are broken ...
1
vote
1answer
281 views

Why do I get an error when I try and clip a shapefile to a shapefile using ogr2ogr?

I want to clip a shapefile to a shapefile. The input shapefile is a 1 m vector grid generated in QGIS. The tile I'm clipping to is just a simple polygon (the geometry is contained within the 1 m ...
1
vote
1answer
64 views

Unable to install QGIS 2.2 successfully?

I'm having problem in installing QGIS 2.2. (64 Bit). After downloading & installing, when I click the OSGeo4WShell, I get a message: C:\***.exe not a valid win32 application and ends with: ...
1
vote
3answers
119 views

How to measure areas using an official CRS which is not available in QGIS?

I am very new to QGIS and doing a project on Glacial Lake Outburst & Flooding (GLOF). I am trying to find the area of a lake using images from Google Earth 7.0.3.8542. I am using the WGS84 CRS ...
1
vote
1answer
410 views

Exporting geodata from QGIS to Esri File Geodatabase?

For a project I need to create a set of vector data that I think I could do in QGIS. However the customer demands that the final data set needs to be delivered in a Esri File Geodatabase. Is there ...
1
vote
1answer
47 views

How to display information when a certain dataset is loaded into QGIS?

I need to show the quality information of a dataset that was manually created by me, that is saved as a text file. The text file will "pop up" when the dataset is added into QGIS. I have no experience ...
1
vote
2answers
104 views

How to translate tens of images from a directory as a batch with gdal_translate?

For example i have a dataset of images in *.cub format like $path: /work/120614/mg_1164/ f01.img.cub_E.cub f02.img.cub_E.cub ' ' f0n.img.cub_E.cub for converting a single image I use gdal_translate ...
1
vote
1answer
71 views

Is it possible to set symbol layers always on top?

Is it possible to set symbols always on top, also if the layer with the symbol is drawn under another layer? Example: My layer order is like that: Streets (top) Buildings Landuse (bottom) The ...
1
vote
2answers
166 views

How to split a (road) buffer using the centerline?

I have a road centreline dataset which I have buffered using the road width. I used the standard QGIS buffer tool. I realise for my analysis I actually need to split the road buffer in half and ...
1
vote
2answers
44 views

error using the QGIS “terrain profile” plug in

I have searched the home page for the "terrain profile" tool but have not found why I am getting error when trying to utilize it. Any ideas? I have a polyline and 4 dems ready to run the tool. Would ...
1
vote
1answer
94 views

How to open most recent directory using PyQGIS?

For example, when I add a vector layer, next time that I want to add another layer it opens up where I chose my last layer from. How would one implement this in Python and/or PyQgis? I'm writing a ...
1
vote
1answer
150 views

Does QGIS Recognize Annotation Feature Classes from File Geodatabase?

My work has recently set up QGIS to access an Esri file geodatabase on a shared drive for my co-workers. I have not used QGIS much, but I have encountered an issue where the annotation feature ...
1
vote
2answers
3k views

how to install QGIS 2.2.0 on mac OS 10.6.8?

Does someone know how to install the latest QGIS on a mac os 10.6.8? The dmg package available on http://www.kyngchaos.com/software/qgis does not run on my OS version. I was only able to find a ...
1
vote
1answer
77 views

Auto generate map from natural earth data with QGIS or other utility

I'm looking at natural earth data to generate each country and save it as a png. What I'm using is: 10m_populated_places, 10m_admin_0_countries and 10m_land. The populates places is the first layer, ...
1
vote
1answer
670 views

How do I use 'model builder' in QGIS 2.2?

I am trying to learn how to use the 'model builder' in QGIS 2.2. I have used model builder in ArcGIS, but I don't understand how to do it in QGIS 2.2? What I want to do is to make buffers, clip ...
1
vote
1answer
260 views

How to populate a combobox with layers in TOC?

I am developing a plugin, and I want user to select one of the loaded layers from a combobox. I've already coded this much: self.dlg.show() layerlist = [] self.dlg.ui.layerCombo.clear() # ...
1
vote
1answer
185 views

extract shapefile attributes from raster colors

I have two layers: a shapefile with states and counties (shp) a raster file (with colors and some text and borders, but not a perfect map) (tiff) I want to use the colors in the raster file to ...
1
vote
1answer
99 views

Run ftools multiparts to singleparts from PYQGIS

Is it possible to run the multiparts to singleparts function from the console with the processing_runalg function? Or is there another way?
1
vote
1answer
150 views

Importing data from Excel into ArcGIS/QGIS

I have downloaded the hourly solar radiation data from NREL which is in CSV format but the problem is that the file does not have an exclusive column called latitude and longitude. There are 100s of ...
1
vote
2answers
513 views

Exporting PDF from QGIS with print composer without destroying fonts

So I'm making this nice map with a lot of labels which are going to end up in a book. Since the labels doesn't end up exactly where I want them I'd like to move them some in Illustrator after ...
1
vote
1answer
133 views

Can I download large areas of OSM data with QGIS OSM plugin?

I have OpenStreetMap data loading failure problem. I want to use the Download OpenStreetMap data tool in QGIS. I want to select the extent from map canvas like shown below: . For me, the osm-data ...
1
vote
2answers
266 views

Techniques for Filtering the Attribute Table in QGIS's Print Composer

For the legend of a trail map I'm working on I'd like to show the trails and their lengths. I have this data in the table. The problem is that not all of the features (lines) have a name or length. ...
1
vote
1answer
680 views

Problem opening shape file in qgis

I am having a problem opening a shape file using QGIS using 'add vector later'. This is the error message i am getting: /Users/Conrad/AmerindianLands 2/Amerindian_Land_Karasabai.shp is not a valid or ...
1
vote
2answers
291 views

How to select objects by N:M join?

I have a layer with some geometries and a data layer that defines an M:N relation. Is there any way I could select (on the map) objects that are in relation with specific id? Basically I would like to ...
1
vote
1answer
159 views

Python.dll could not be loaded with PyScripter

I'm trying to configure PyScripter with QGIS. I've installed it using OSGeo4W and I'm following instructions to setup a pyscripter.bat file by copying content of qgis.bat file. I have the following ...
1
vote
1answer
61 views

Overlay polygon on raster and save as new raster with same resolution

New to GIS and trying to learn. I'm trying to take a blue marble raster, overlay a countries .shp file, and save an image with the original blue marble image and the country outlines "burned into" the ...
1
vote
1answer
679 views

Can't select layer in the Road Graph plugin QGIS

I'm trying to use the Road Graph plugin in QGIS 2.2.0. I have tried a few line shape files, but it won't let me select the layer (the option is greyed out). I've tried adding a 'SPEED' field and a ...
1
vote
2answers
387 views

How to create a time series with a NetCDF raster from Ensembles E-OBS using GDAL, R, GRASS GIS or SAGA GIS

I downloaded a NetCDF file that contains daily precipitation values from 1-1-1950 to 30-6-2013. The raster has 23191 bands. http://eca.knmi.nl/download/ensembles/download.php My goal is to analyze ...
1
vote
3answers
78 views

How can I change more than one attibute at the same time?

I'm working in QGIS 2.0.1 Dufour. I started by cretaing a shape file form an AutoCad file. The problem is that in the AutoCad, my layers had symbols like: "~; ç; ^". As the QGIS does not support this ...
1
vote
1answer
118 views

Are unicode symbols supported in QGIS labels?

I want to use unicode symbols in a QGIS label - is this supported? I.e. I have this expression for labelling a line: case when xat(-1) - xat(0) > 0 then 'GF ->' else '<- GF' end and ...
1
vote
1answer
136 views

How to create a hyperlink in one point?

I started to use Quantum GIS 2.0.1 Dufour and I'm still trying to understand how to work with it. I have a shape layer in QGIS made of points, and I want to attach a different hyperlink to each of the ...
1
vote
2answers
54 views

How can I determine which polygons contain other polygons?

I am using only free, open source tools. I have two shape files: a shape file of voting precincts and a shape file of census tracts. I want to know: which voting precincts fit inside which census ...
1
vote
1answer
51 views

How do I get the attributes of a particular polygon in qgis

I downloaded a shapefile that has demographic data for census tracts for a city -- each represented by a polygon in the vector layer. I can click the attribute table icon to see the whole sheet of ...