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

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1k views

How to install PostGIS and OpenLayers plugins?

I am new to QGIS and have installed the QGIS v 2.2.0. For adding google map as a base layer I need to install OpenLayers plugin. I also need to add the PostGIS plugin for DB management purpose. Can ...
0
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1answer
47 views

How to find qgis2 folder to delete in ubuntu

How can i find the qgis2 in qgis and where it is installed, i had one error on when qgis open this error will occurred "[ERROR] Can not make qgis.db private copy" some links told delete the folder ...
1
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1answer
87 views

How to create a TAB with custom CRS using QGIS?

I meet problem about reproject in Qgis. I created coordinate user defined. i used version Qgis 2.2. I defined coordinate: Name: VN 2000 / 107.75 3degees Parameters: +proj=tmerc +lat_0=0 ...
4
votes
1answer
669 views

Continuous color band for a raster legend in QGIS composer legend

I'm looking for a way to insert continuous colour legend for a raster layer. I managed to create discrete symbols with values along the bar, but I would like to have a continuous bar with some values ...
0
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1answer
31 views

Join text with layer

In Mapinfo it´s easy to link a text-layer with a geometric layer by attributes with outcome as a new layer. Where and how to do this in Q-GIS?
1
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1answer
74 views

Transect with square polygons

would like to create with QGis 2.2 (german version) several square polygons (1km ²) that seamlessly connect to each other, so that a strip ( transect ) of 9km times 1km length results . ( I once ...
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0answers
22 views

Move and zoom map-layer while editing

I want to create lines with the help of "CAD-like improved line capture", make a point, pretend an angle or distance want to put the second point. To this end, I have to zoom out on the map, select a ...
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3answers
2k views

How to convert UTM coordinates into Decimal Degree coordinates?

I work on QGis 2.0.1 - Dufour on Macintosh OS X Mavericks. I have UTM coordinates (XXXX and YYYYY) in a table (with one column of X and an other one of Y). I need this coordinates in Decimal Degree. ...
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1answer
58 views

Retrieve path of running plugin in QGIS

In my plugin's directory I've got some XML settings files that I'd like to parse at a particular point during execution of the plugin. Is there a way to get the absolute path where the plugin's .pyc ...
1
vote
1answer
646 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 ...
2
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1answer
130 views

Can you create a CRS of superseded NSW Datum

I want to use a superseded projection (NSW integrated survey datum - referred to as ISG) because my main client utilises it. The projection is based on AGD66. We regularly receive survey files in this ...
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2answers
328 views

Missing Dependency in SAGA. Orfeo Toolbox does not work

Hej guys, I am trying to perforem segmentation from Orfeo Toolbox (QGIS last version 2.2), whenever I try to use the toolbox, I get the following message: Oooops! The following output layers could ...
2
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2answers
383 views

Simplify Multigeometry polygons in QGIS

I am really new to QGIS and KML so this might be obvious but I am too ignorant to know what to do. I have some KML files I would like to use in an application but they are much more complicated than ...
1
vote
1answer
380 views

QGIS Map tools and Map canvas--QString errors

I'm trying to learn more about using QGIS Map Canvas widgets and creating custom map tools, so the information from the PyQGIS cookbook is very helpful. After trying to experiment with mywnd.py from ...
2
votes
1answer
281 views

QGIS html annotation relative paths

I find the QGIS html annotation tool is very useful for quickly accessing a combination of key data attributes and photos. I am having trouble using relative paths for images. This doesn't work: ...
3
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1answer
181 views

Change from polygon to multipolygon in postgres

can somebody describe please how to do the transformation from polygon to multipolygon in the postgres DB, is not possible for me to save my edited data. All data loaded just need to do some editing ...
1
vote
1answer
98 views

How to select and zoom in features from a QGIS Python Plugin

I'm very new to Python. I'm trying to find a way to select and zoom to the features from a QGIS layer. I've created a plugin and built a custom form. I have 3 values from the form which I need to ...
1
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0answers
213 views

Looking for cloud hosting similar to QGIS cloud

I have about 6 or 7 large clients who each require some form of personalised online mapping service. My aim is to produce a secure login required database for each client using my shapefiles and ...
1
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2answers
359 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 ...
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1answer
65 views

QGIS 2.2 expression string builder removes brackets

in QGIS 2.0.1 is used to calculate minimum building distances (Abstandsflächen in German) with an ellipse marker with data definded properties. the expression for this is quite complex: (('Value 1' ...
0
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1answer
63 views

Why do field values change when exporting from QGIS?

Today I came across a very strange behavior of QGIS. Maybe someone knows what's going on? I have a table with two fields which are defined as Double, with a Length of 20 and a Precision of 0. Some ...
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0answers
46 views

Why can't I save a line shapefile?

I'm working with qgis v. 2.0.1. I have some data points and I just wanted to create a new shapefile with line geometry. In the new vectorlayer-window, I added some attributes (approx. 10) and klicked ...
1
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1answer
138 views

Reprojecting kml in NAD27, 83 or WGS84 using QGis

I have downloaded a kml file from Google containing location of shops. The coordinates in that file are in lat/long. I have other shp files containing roads and territories. I am trying to have all ...
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2answers
85 views

Highlight specific area in a box in print composer

My problem can be easily illustrated by the first picture on this site: http://bitmedia.dk/rentegning-af-kommunekort-til-faktaillustration/ I already have the overall map, but I want to make a box in ...
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2answers
99 views

How to number points along a line consecutively

I have a line and along this line I have different points which are max. 20m away from that line. Now I would like to number the points along the line, like shown in the grafic. Any suggestions how to ...
0
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1answer
40 views

Changing band for greyscale in plugin

I am trying to make a qgis plugin to change which band in a multiband data set (netCDF where the band represents time steps) is used for a grey scale rendering. The file works fine with manual ...
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0answers
18 views

Atlas - How to set in rows from table linked to polygonlayer?

I have polygonlayer and a textlayer. The polygons have unique ID´numbers. The textfile also have unique ID-numbers (and therefore possible to join together, yes), but it contains several rows with the ...
0
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1answer
50 views

how to findout semi attched or detached polygon in Qgis?

i m quite new to GIS,i've got polygon shapefiles and i want to find out the way that polygon are attached,semi attched or detached.i have area and perimeter of polygons,but i want to know length and ...
1
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1answer
106 views

How to Lock Grid and Scalebar in QGIS Atlas

Have just started using Valmeira and I am looking at generating an Atlas. I am using irregularly sized features as the index. The challenge I have, is when I set up the template page and scalebar ...
1
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1answer
310 views

QGIS 2.2.0.1 Valmiera, Windows 7 64 bit - copying out of GDALInfo-Window in QGIS not possible

When trying to copy information given out by GDALInfo with different kinds of raster data (DEM, normal georeferenced images etc.) through the interface of QGIS 2.2 by right-clicking and choosing copy ...
2
votes
2answers
1k views

How to extract X Y coordinates and RGB from pixels using python in QGIS?

I'm trying to white a Python plugin in QGIS (2.2) to get, for each pixel of a raster image, its X Y coordinates, as well as, its RGB (3 bands) values. At first I opened the raster file using: rlayer ...
3
votes
1answer
150 views

PostGIS create read only user for QGIS

I am having issues reading spatial tables in QGIS with a select-only "reader" user. I can create the reader user to access regular postgres tables like this: GRANT USAGE ON SCHEMA test TO reader; ...
0
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1answer
208 views

How to extract NDVI values into polygon vector map with QGIS

I have calculated the NDVI values of a satellite image using the raster calculator. Now I need to have these NDVI values extracted into the attribute table of my polygon vector file. Is there a ...
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0answers
29 views

How can I remove dipoles from rasterlayer in QGIS 2.2?

I work with geomagnetic survey data. When convertet into a rasterlayer, every object with a high magnetic potential (for exampel an iron-nail on the surface) is shown as very sharp anomalie called ...
0
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1answer
93 views

Layer relations via Python

Is it possible to, through Python, to create the relations that it's possible to create in Layers/Properties/Fields/Relations, and if so how? I first thought these were saved in the styles, but that ...
1
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1answer
102 views

How to save QGIS composer template with image - e.g. company logo?

I can't figure out how to save QGIS Print composer template with image. In our map compositions we always have company logo in one place. It is easy to add image (logo) to composer and place it to ...
1
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2answers
98 views

How to disable “Simplify geometry” via Python?

After I've loaded a layer from a table in my db I'd like to disable the 'Simplify geometry' (found in Layers/Properties/Rendering) programatically using Python. I've tried several versions of ...
2
votes
1answer
442 views

How to import a 3D DXF file into QGIS with z information as attribute value?

I have a dxf file of 3d contours. after import it does have only layer,x,y attribute and doesn't have Z attribute. how can I provide Z attribute to create a TIN file.
2
votes
2answers
1k views

QGIS 2.2 Crash dumped on Windows 8.1

After I installed QGIS 2.2 via OSGeo4W, as I click the icon of QGIS, then it shows this up, so I can't open QGIS 2.2 Here's some look like troublesome lines in my installation log, 2014/03/23 ...
4
votes
0answers
433 views

How to create multi-ring buffers automatically in QGIS? [duplicate]

I'm wondering if anyone knows of a tool or plugin for QGIS that allows for multi-ring buffers. I've found a post about doing multiple buffers one by one, but was hoping there was a way to do this all ...
0
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0answers
65 views

QGIS 1.8 runtime error under Windows 8.1

I tried to open qgis 1.8, and everytime I click its icon on my desktop, shows this, and then it crashed, thus I always couldn't open it. I saw an analogous question in this post, Microsoft visual ...
0
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1answer
187 views

Why is shapefile layer not visible on WMS layer in QGIS?

In my QGIS project I have added a WMS layer for which the CRS is WGS84 EPSG:4326. Now I want to show my shapefile layer which has the same CRS. QGIS shows the layer separately but does not show with ...
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0answers
272 views

Editing QGIS point layer: retrieve attributes of intersecting line layer

I'm creating a custom editing form using QGIS 2.0 and would like to modify the mouse event when creating a point. I've gotten a start by reading this thread: How to programatically check for a mouse ...
2
votes
2answers
642 views

How to set Eclipse and PyDev for QGIS when ArcGIS is installed?

I have got a lot problems with the configuration of Eclipse with PyDev in order to develop QGIS plugins. The situation is very weird and frustrating. I can import qgis module using Pyscripter without ...
3
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2answers
147 views

How to remove/disable a toolbar via python?

How do I remove or disable a toolbar e.g., Raster, programmatically using Python?
2
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0answers
78 views

Zonal Statistics Freezing QGIS 2.2

Running on Windows; 8gb memory, 500gb HD, i5 cpu; Raster file: 250mb I am having a problem with zonal statistics advancing past 17%. I am trying to run statistics on a crop grown in certain counties. ...
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0answers
121 views

I had an error in Gdalwarp and i don't know the reason

I was trying to warp a raster using a mask and shift it before clipping but when i exectute the command bellow in Qgis/PyQt using QProcess: gdalwarp -s_srs "+proj=merc +a=6378137 +b=6356752 ...
1
vote
1answer
229 views

How do I add a corel scale drawing

I have a plan of a building, drawn to scale in Corel Draw. The whole drawing was 'surveyed' using the principal of taking distances from of each of these 2 points to identify the location of a 3rd ...
1
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3answers
1k views

QGIS 2.0.1.3 (Dufour) and 2..2.0.1 (Valmiera) 64 Bit versions: uninstall not completely possible, crashes at exit

haven't tried the stackexchange page before, but since I can't find information on this problem: I can't completely uninstall QGIS, I want to do a complete, clean reinstall, but whenever I start the ...
2
votes
1answer
146 views

Update postgres/postgis point data attribute from another enclosed polygon shapefile in QGIS

I have a placename point table in postgis with 'district' column. a districts polygon shapefile with district name in 'Name' column. See the image below. I would like to update the 'district' ...