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

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152 views

Programmatically modify layer datasource on project save event (QGIS)

I have a QGIS plugin which allows users to add WFS/WMS layers to the map. I would like to be able to scramble the user ID part (token) of the uri when the project is saved/closed and then use my own ...
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2answers
372 views

How does one export the list of stored WMS-servers in QGis?

Could anyone point me as to where QGis stores the list of WMS-servers you added? I have built a fairly large list of WMS-server on one computer, but the QGis-project file which gets accessed by my ...
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0answers
127 views

QGIS custom form and autocompleted data entering with “validation check”

In Qt-Designer I created a custom form where I can choose serveral species names in two different combo boxes. This combo boxes are linked via "value relation" to the accordant non spatial tables ...
2
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0answers
268 views

length and width of polygon

how can i find polygon's length and width in Qgis(regular polygon and irregular polygon)? i have area and perimeter but possible to have length and width ?.
7
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3answers
531 views

Merge images first, or georeference first?

I'm wanting to georeference and vectorise some features from scans of the OS 1896 Town Plans that I have purchased from the NLS (http://maps.nls.uk/os/london-1890s/info.html). The scans provided are ...
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2answers
62 views

Where are QGIS application setting file(s) stored?

I have some application settings (Windows/QGIS v2.0) that I would like to pass to other users (such as those settings defined under Settings menu>Options>Rendering tab). In ArcGIS they are stored in ...
2
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0answers
165 views

Is there a decent algorithm in QGIS Process Modeller to create a grid?

I am using Process Modeller to automate merging several vector layers and then creating a grid to cover the extent of the merged layer. There are functions which already exist which are not listed in ...
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1answer
193 views

QGIS: graphical-modeler to calculate area of polygons

I'm trying to calculate the area of polygons using the field-calculator in QGIS (2.0.1). If I do this manualy it works fine, but if I do this using the graphical-modeler I get NULL as area for every ...
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0answers
43 views

How can I see the overlay of two features (point & polygon)?

I am trying to open two digitized layers, one containing points in a region and second which I have downloaded separately for the region as polygon layer. I would like to overlay two of these layers ...
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1answer
62 views

How to use QGIS field calculator to delete style code?

I am struggling with following issue: How to delete style code before id codes x.x.xx.. and the }s in the end? Examples below. Any help appreciated! {\fArial|b1|i0|c0|p34;A.B.11} ...
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2answers
447 views

How to make multiple qgis mapbook pages in 1 pdf?

Is it possible to export a mapbook in QGIS 2 with multiple pages all in one PDF? Thanks
4
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2answers
897 views

How to add Georeferenced PDF as layer to QGIS 2.0?

I have some georeferenced pdf's that I would like to open in QGIS. I have read that GDAL version 1.8 and higher will support pdf, and I have GDAL 1.10 installed with QGIS 2.0 on Windows 7, but when I ...
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1answer
191 views

Spatialite Table Difference in QGIS

I am see differences between tables when I view them in spatialite-gui and in QGIS. I have created a table, added columns, and updated the columns in spatialite-gui. Within spatialite-gui I can view ...
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0answers
166 views

Error: .asc is not a supported raster data source

I am new using QGIS and struggling with this error "...... .asc is not a supported raster data source" when trying to add a ."asc" file as a raster. I downloaded the files from ...
0
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1answer
129 views

Mac QGIS files to Windows Arc GIS compatibility

If I download QGIS on to Mac will the shapefiles and layers I create be compatible with ESRI ArcGIS 10.1 on windows?
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0answers
59 views

Error 14: Could not open CRS database

I am using Python Console and loading a Vector Layer using python commands. When the layer is added, QGIS first asks for the CRS to use, but I don't have all the CRS listed out to select the Reference ...
1
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1answer
207 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 ...
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0answers
75 views

HTML Annotations

I am trying to insert html annotations into my map. I was hoping they would be interactive and pop up as you move over or click on a feature, but they don't seem to function this way (that I can ...
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2answers
2k views

QGIS Select by Expression

A basic QGIS 2.2.0-Valmiera, Select By Expression - Field Calculator question. Introduction I am a geologist searching through a geological database (see attached figure). I have a shape file and ...
7
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2answers
619 views

Unable to get python-qgis-common on Kubuntu 14.04

just upgraded my Kubuntu from 13.10 to 14.04 LTS and lost all plugins. Found out that "python-qgis-common" is not installed. Tried to install it but was told that it depends on "sip-api-10.1" which ...
1
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1answer
737 views

Split a line feature using nearby points

I have a line shapefile and a point shapefile, and the line has its own segments and its attribute table, the point shapefile has points near the line above, not on it and the close ...
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1answer
364 views

QGIS crash Ubuntu 14.04

Encountering a crash when requesting QGIS 2.2 to access data on desktop machine. Running Ubuntu 14.04 LTS. $ qgis Warning: loading of qt translation failed [/usr/share/qt4/translations/qt_en_AU] ...
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1answer
156 views

Building with MinGW 4.8

I'm working on a project where we would like to add QGIS features to an existing Qt application. The Qt application has been built with Qt5.2.1 using MinGW 4.8 and thus I think I need to build QGIS ...
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1answer
976 views

QGIS 2.2: GDAL Grid (Interpolation) Error

As much as i understand Raster -> Analysis -> Raster (Interpolation) can provide me with a terrain file out of a shape file with a Z coordinate. I select the input and output file and a Z field. It ...
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0answers
141 views

back up of qgis file

Can we recover a previously saved version of qgis file? For example: I have saved my qgis file about an hour but I need the yesterday's back up of qgis file. The file which does contain today's saved ...
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4answers
592 views

How do I use QGIS 2.2 to plot some locations on a map (of the US by zip code)?

I am a newbie to QGIS. I just installed it on my MAC Airbook with Mavericks. How do I simply plot a few locations on a map of the US? All of the tutorials I can find on the web are for older ...
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1answer
93 views

Excel Nad83 table to gpx-Total noob

I have some waypoint locations that I have entered into a spread sheet in Nad83 the format of table looks like this NAME, -, -, UTM ZONE, Easting, Northing, -, Comment 1184236, 1, CP, 15, 451596, ...
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1answer
202 views

Including two different maps in one QGIS Print Composer

How do I use print composer in QGIS 2.0.1 to produce a final product with two different maps on the same sheet? I can't figure out how to use the 'add a map' button to add anything other than a ...
2
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1answer
539 views

How to get Drainage Divide and Streams from DTM

Does anyone know how you can get a map like this attached, having the digital terrain model? I'm sorry, but I do not know what is the exact technical term in English for them. I hope you understand ...
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1answer
82 views

Why do the SHP lines in QGIS Android look jagged (very simplified)?

I use QGIS for more than five years. I'm trying to make my way with QGIS Android for a while now. For some time I experience the following problem with the "nightly build" 2.0.1-Dufour: the SHP lines ...
2
votes
1answer
759 views

Why does clipping a line layer using a polygon result in an empty shapefile?

I am using QGIS 2.2.0 and want to clip a line layer (roads) so that only those inside a polygon are shown. When I do this using Vector->Geoprocessing Tools->Clip I only get an empty shapefile as an ...
4
votes
1answer
329 views

Programmatically change layer position in the table of contents (QGIS)

I am trying move/position a layer to the bottom of the TOC by using addTopLevelItem on all other layers. I unsure how to reference the layers as QTreeWidgetItem's. def bg_bottom_level_item(self): ...
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0answers
156 views

MODIS images set CRS and reproject

I am developing a plugin which reads MODIS images, and I know that MODIS images are in sinusoidal projection and I need to set that CRS and project the image to WGS84 (epsg 4326) in python. I search ...
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1answer
321 views

QGIS 2.2 - expression string builder to ignore NULL values

Simply put, I would like to create a rule-based filter whereby you add 2 columns together and you get a certain colour as a result. However, some fields in Column_1 may be NULL and those exact same ...
3
votes
1answer
110 views

loss of attribute data when copying between layers

I am trying to copy points from one layer to another in QGIS 2.2 The problem I get is that all the attribute data from the copied points is missing when copied onto the new layer, the columns show ...
4
votes
2answers
180 views

Read an INSPIRE GML in QGIS2.0 : gml:xlink resolving

I'm trying to read an INSPIRE GML, which contains internal and external links between the elements. I saw on the GDAL site that we can set environment variable in order to load this link in QGIS ...
0
votes
1answer
90 views

In QGIS are there similare construction tools to ArcGIS?

For a project we are using ArcGIS to reshape autogenerated features. For that we often use the construction tools polygon, rectangel, circle, etc in ArcGIS. The right angle is also an often used tool. ...
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1answer
643 views

How to go with…somewhat complex geological maps in QGIS?

Just a follow-up to this question QGIS: Line to polygon conversion. Not sure do i have to continue there itself... We are currently digitizing a geological map...which has 36 features in total. Some ...
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4answers
579 views

Needed shape file for Australia and New zealand

I was trying to find a shape file which has Australia and New zealand together(states) so that i could convert to jvectormap for ANZ. where i can find it?
1
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1answer
241 views

finding orientation -direction of polygon

i have one polygon layer and another is point layer,i want to findout orientation automatically of line of polygon which is parellel to the street and closest to the point.i am using Qgis 2.0 .is it ...
1
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0answers
134 views

Problems rendering tilestache served mbtiles in QGIS

I came across Geoffery Hing's walk through on using Tilestache to serve up mbtiles to QGIS. I followed the configuration and I was able to view tiles in the browser without any problems. However, when ...
0
votes
1answer
39 views

Trouble Using Selection Expression in QGIS

I am trying to use the selection expression box to highlight counties by state FIPS. When I use the OR conditional all counties across the US get highlighted. So for example, STATEFIPS = 1 will ...
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0answers
117 views

error (407) Proxy Authentication Required plugins mmqgis e geocoder Qgis

By using Geocoder plugins and mmqgis QGIS to geocode some addresses using Google the error (407) Proxy Authentication Required occurs. I entered the settings and put the QGIS network address, User ...
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2answers
722 views

How to I convert from decimal degrees to meters in Qgis?

I am trying to convert from decimal degrees to meters in QGIS. I have a shape file that is currently in WGS84/UTM zone 19S. I have tried the save as - browse - WGS84 EPSG:4326 but this appears: ...
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votes
1answer
94 views

How do you calculate the area of polygons which overlap a buffer around a point?

I'm new to QGIS (Dufour 2.0.1) and have plotted nests as points on a googlemaps base-map and have created buffer zones around the nests. I've also plotted ponds as polygons on the same base-map. I ...
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1answer
295 views

QgsGeometryAnalyzer.dissolve problems

I am completely new to the QGIS python api and I am running into an error which I cannot solve when trying to use the dissolve class. I used the basics of the PyQGIS Cookbook. In my understanding ...
0
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2answers
84 views

How can i create a link to a whole folder?

I know how to create a hyperlink to a single pdf-file: Create a hyperlink to a pdf file in the attribute table But now I want to make a link to a folder with 3 or 4 pdf files in it. Is that possible? ...
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1answer
137 views

QGIS: Line to polygon conversion

Currently we are working in a geological project..in which all the Contacts, Linear & some other geological features have to be captured. The thing is most of the features have to be Captured as ...
0
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2answers
133 views

Problems building QGIS 1.8.0

I am very new to QGIS (and the entire Linux thing). I am trying to build QGIS 1.8 on ubuntu 12.04LTS. I specifically need to use the 1.8 version of QGIS. When running the "make" command, I see the ...
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0answers
34 views

Looking for QGIS 2.0.1 [duplicate]

So I deleted my old version of QGIS Dufour (2.0.1) with the intention of replacing it with the new version (2.2). It wasn't until I deleted my old version that I realized my Mac OS 10.6.8 is not ...