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

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131 views

How can i change vertex option programmatically using python in QGis?

I want to activate the option "Show markers only for selected features" in Setting-> options->vertex markers ,using python. does anyone know if i can do it programmatically ? i attached a photo of the ...
2
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1answer
200 views

How can I set a specific meter scale in the print map composer?

I am making a map for an orienteering class at the environmental education center that I work at. In order for us to easily calculate the distance between orienteering points, I need the scale to be ...
4
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1answer
101 views

Postgis geometry type = Geometry

Simply I've got a number of PostGIS layers that have a geometry type of Geometry, as a posed to point, line, polygon. wkb_geometry geometry(Geometry,27700) QGIS 2.0+ doesn't like this very much ...
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3answers
104 views

Determining gaps in polylines and identifying continuing sections?

Is there a relatively quick way to identify where gaps < a certain size are present between polyline? E.g. would there be an easy way to join line likes the ones in the below image if the gap was ...
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1answer
342 views

Label features on hover/click with QGIS?

Simple question: Is there a built in/easy way to show labels for features based on a hover or click action with QGIS 2.0.1?
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1answer
120 views

Installing Lecos plugin for QGis 2.0.1 on linux fedora 20

I try to install Lecos plugin, which requires python imaging library (pil), but the installation fails with the following: "you need to have the image library pil installed" I installed the ...
1
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1answer
410 views

Merge multiple geometry type TAB files in QGIS/OGR

I have a number of vector layers with all types of geometry (point, line/multiline, poly) and I want to combine them into a single layer in QGIS. I know MapInfo can do it but with the other 99% of my ...
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2answers
175 views

adding helicopter video files to Google Earth or QGIS

Is it possible to add a helicopter's video files to Google Earth or QGIS ? We have a flight path points derived from the xml file associated with the .mpg file which I envision being used to pilot ...
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1answer
173 views

Error using “r.los” in QGIS

I am not a "computer person". So -- I don't know what this error message means. I found this question and answer for this same problem, but the solution did not work for me, dammit. GRASS algorithm ...
5
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2answers
668 views

how would one get the end points of a polyline?

I am attempting to write a script to get the end points of a series polylines, and then use those end points to create a polygon. I'm not sure which tools to begin to use on this project. I would ...
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0answers
46 views

How to get tiff file of project limits at specific scale using QGIS 2.0?

I have shapefile which has a layer extent scale of 1:551920. I want the TIF file exports of the file at a scale of 1:200000. Is there way to do it automatically? Or do I have to do it manually by ...
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0answers
274 views

Printing/exporting WMTS tile layer with desired resolution / zoom level in QGIS

I have a project which uses WMTS and some vector layers in QGIS. I can freely zoom in and out, and tiles are refreshed with appropriate zoom level, just as expected. Now I would like to export part ...
3
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1answer
50 views

New field names after joining 2 tables in QGIS

When joining two files (A.csv and B.shp with a common unique ID) in QGIS the new fields in B.shp (from A.txt) include the name of the field + the name of the file where it comes from (A). For example ...
3
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1answer
221 views

QGIS - How can I convert a raster file to a vector file without making same value cells into one polygon?

How can I convert a raster file to a vector file without making same value cells into one polygon? In the attached image, the values "2124", "2269", "2321", "2634", and "2920" are the polygons ...
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0answers
66 views

Qgis 2.0: Several symbols in one line behind a label?

Is that possible in qgis 2.0: If a city have several POIs which I can not draw at their origin location because of the scale of the map or because there are just too much symbols, can I draw them ...
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1answer
102 views

Sextante in QGIS - downloaded, but does not show up

I downloaded Sextante, and I put it into the directory C:\users[my_user_directory].qgis\python\plugins\sextante-1.0.9\sextant I re-started the computer, but there is still no sign of Sextante in ...
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1answer
70 views

QGIS Hexbin Color Ramp Inversion [duplicate]

I have a very basic question concerning QGIS symbology: How do you invert a color ramp for a hexbin layer? I could do the inversion to get reds to be the higher values in the raster equivalent of the ...
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1answer
409 views

QGIS converting to ASCII question

I am attempting to do some analysis on a raster file and I need to convert it to ASCII. In QGIS, I used [Raster -> Conversion -> Translate] with the asc file format, and I suspect it is simply ...
7
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2answers
682 views

How to write scripts that can call on both Arcpy and PyQGIS?

I have spent quite a bit of time looking for a clear answer this topic and have still been unable to really accomplish my goal of accessing PyQGIS in a stand alone script. Parts of answers have been ...
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1answer
62 views

QGIS problems getting layers to line up correctly.

I am trying to add a raster layer and a vector layer to qgis. I have set both of their CSR to NAD83 Oklahoma North State Plane. It doesn't seem to work even with all the files set to those CSR. ...
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0answers
98 views

QGIS on Android: Access files on Google Drive

I have a set of shape files that I keep updated on Google Drive. I have just installed QGIS on an Android tablet but I can not figure out how to get access to the google drive from the file menu. ...
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0answers
84 views

Simplify by number of points in QGIS

I have a fairly simply question about something I just don't know how to do. I am aware you are able to simplify polygons in QGIS based on distance tolerance but my questions is, is there a way to ...
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1answer
910 views

how do I install QGIS for Android?

I am new to Android (just brought a Nexus 7) and I am trying to get QGIS onto it but I can not find any installation instructions. I have found http://android.qgis.org/download/qgis-installer.apk and ...
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2answers
656 views

How can I crop an area from openstreetmap in QGIS? [duplicate]

I have used openlayers plugin, and I downloaded openstreetmap. I need now only a part of the map, not all of it, how can I do that? I need to crop Dubai city as example, I tried to use Clip in Vector ...
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1answer
150 views

QGIS with CH1903/LV03 and WGS84 layers

I have a few CH1903/LV03 layers (lake, river and the country border of Switzerland) and a layer in WGS84 (two points of two cities, Vaduz and Bregenz). On-the-fly-transformation is activated but ...
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2answers
976 views

How to capture contour lines from OSM cycle map as vector?

In QGIS, there is a plugin to insert a OSM cycle map layer, that brings as an image from http. But I can't convert this OSM Plugin layer to a raster image. I can't even imagine how to get the contour ...
3
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1answer
216 views

Batch map creation, iterated over attributes of a layer, in QGIS

I am using QGIS 2.0.1 under Mac OS-X 10.8.2. I have a layer of counties in New Mexico to which I have joined a csv file that includes presence / absence of plant species by county. I've set up the ...
2
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1answer
106 views

Add Custom Data to OpenLayers Plugin for QGIS

Is there a way to add custom data to the OpenLayers plugin for QGIS? I have tiled data using Map Tiler, which has produced my zoom levels, and an OpenLayers.html. I am hosting it internally on our ...
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0answers
88 views

Rendering OSM with QGIS for MapServer to use in OpenLayers

I want to show tiles in OpenLayers offline. I've installed QGIS 2.0, TileCache, and MapServer on Windows. Enabled plugin OpenLayers in QGIS. What kind of data I suppose to extract from QGIS with my ...
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0answers
77 views

header information is missing from image, after writing using opencv

I am doing complement of an image using open-cv python, while writing the image, open-cv is not writing the header information in the complemented image. my image data are in TIFF format. i am doing ...
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2answers
209 views

How can I read binary PBF and bzipped XML OSM data in QGIS?

How can I read binary PBF OSM data, e.g. example.osm.pbf or bzipped XML OSM data in QGIS?
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3answers
228 views

How do I get the value of the pixel under the cursor?

Is there a tool or something that will give me the value of the pixel under the cursor? What I've got in mind in something like the eyedropper tool in graphics programs that allows you to ...
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0answers
64 views

How to crop google hybrid map in QGIS? [duplicate]

I download google map from openlayers plugin in QGIS, it was like this: How can I crop the view to get a certain area from the map like this:
2
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1answer
204 views

How can I add grid lines to a print composition using pyqgis?

I'm writing a qgis plugin to create an image in the print composer of the current map. I can get the map rendered in the proper place with a frame of the right width, and I can get grid annotations ...
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0answers
58 views

How to convert overlapping polygons in single layer to raster by count in QGIS?

I'm trying to do this in QGIS 2.0 (Mac Mt Lion). But cannot do step 2, as I can't dissolve original polygons by 'count' in QGIS (in that tool at least). Advice?
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0answers
68 views

QGIS over WatchGuard Mobile VPN with SSL

something quite strange occured today. I connected to my office through WatchGuard Mobile VPN with SSL enabled. I got loads of errors about SSL certificates, WMS errors (there were WMS layers in the ...
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1answer
564 views

How can I download maps from mapquest?

I need to get a detailed map for my own purposes. I need it detailed as much as I can see the buildings (like google map hybrid mode). I went to http://open.mapquest.com/ but I couldn't find the way ...
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1answer
242 views

Flow mapper plugin failed

I want to create a desire line with the Flow Mapper plugin using QGIS version 2.1. After I did, it has failed. The data that I used is pictured below. There may be an error procedure I have used. Can ...
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88 views

QGIS: Albers projection in lat lng?

I'm trying to make a map of Russia in the Albers projection. My projection string is: +proj=aea +lat_1=45 +lat_2=70 +lat_0=40 +lon_0=100 +x_0=20 +y_0=20 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m ...
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0answers
82 views

Cropping elements from one layer to an element from another

I'm trying to make a hex map of a country (Russia, in this case). To do this, I've opened a map of Russia in QGIS (from Natural Earth), set up my projection, and created a hex grid with MMQGIS. So ...
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3answers
288 views

How to access shapefile table in QGIS Modeler R scripts?

I need to develop .rsx scripts for QGIS 2.0.1 Modeler to do statistical elaborations on data tables of loaded vector layers. In this case I am not interested in accessing shapefile geometries, I'd ...
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1answer
156 views

OS Boundary Line shp export CSV with description and lat/lng

I have found several post saying it is possible in QGIS to export OS Boundary Line shp files to csv's containing the boundary line in lat/lng (for use on Google map) along with the name of the area, ...
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0answers
199 views

QGIS 2.0 Problem with loading a Layer Style file that contains a transparent pixel list

I work with QGIS 2.0.1. For my raster file I have created a Layer Style with a transparent pixel list. When I import a rasterfile in a new project and load the layer-style file, the map changed to ...
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0answers
215 views

QGIS print composer error due to Java script problem!

I've been experiencing a problem with the QGIS print composer. I am working on a Linux Ubuntu platform (Release 12.04 (precise) 64-bit) and I am using QGIS 2.0.1 Dufour. I need to export a number of ...
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1answer
62 views

How to measure and mark a line or point as a template QGIS?

I'm digitizing some of our sewer assets and need to be able to measure distance and create points. So, for instance, I have a sewer main that is 65m long. I need to mark a point at the 32m mark, then ...
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0answers
84 views

QGIS grabs incorrect field values for categorized style classification

as seen in the first image, the field values QGIS returns when I attempt a 'select by expression' are values found nowhere in the field in question ('FLD_ZONE'). Instead, it returns a selection of ...
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2answers
114 views

How can you insert a custom symbol?

How can you use a custom symbol for either dot density or proportional symbol maps in QGIS? Is there a way to import a symbol of your own such as a drawing or image that you can create or download ...
0
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1answer
101 views

How to change QGIS project color space

Is it possible to change the color model of an entire QGIS project from RGB to CYMK? I know that it's possible to change the color models of individual symbols/features (through the style manager), ...
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1answer
52 views

QGIS Raster Calculator dialog doesn't resemble that in documentation

I'm very new to QGIS. Raster Calculator looks (from online sources) like it ought to have all kinds of buttons and fields. Mine is rather stripped down. I have two rasters open, and I just want to ...
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2answers
609 views

How to avoid “Handle bad layers” message when using QGIS Flowmapper plugin?

In QGIS, if I close a project and try to open it a few days later I often get a message that says "Handle bad layers". This is very frustrating because when I open the project various layers will have ...