Tagged Questions

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

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1answer
71 views

Use PyQGIS to import CSV and draw points using different color

A CSV file contains columns latitude, longitude and color. uri = "file:///C:/data/balls.csv?type=csv&xField=longitude&yField=latitude&spatialIndex=no&subsetIndex=no&watchFile=no" ...
2
votes
1answer
48 views

Add OpenLayers layer from QGIS's Python console?

On QGIS 2.4.0-Chugiak the Openlayers plugin is found under Web menu rather than the Plugins menu. How can you use the Python console to add a Openlayers Google Maps layer? The following code give us ...
3
votes
1answer
38 views

QGIS GRASS shell commands not working in Yosemite

First time asking a question here. Running GRASS 6.4.3 within QGIS 2.4.0 on Mac OS 10.10 Yosemite. I'm trying to run v.net.iso within the GRASS shell, but the following error is returned every time: ...
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0answers
13 views

Tracking Conversation Records using QGIS

I am working on a project that covers three small towns. I wanted to keep track of a large number of conversations I have with an equally large number of land owner. I have a GIS file set up in QGIS ...
0
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1answer
42 views

Integrate QGIS Server with existing Wordpress installation

How can I integrate QGIS Server with an existing worpdress installation? I have tried but cannot get capabilities to appear. Maybe something to do with Htaccess or httpd.conf but I cannot ...
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0answers
20 views

I need to convert a kml file to a shp file without losing any attributes [duplicate]

I am unsure how to do this, I think that global mapper would do the trick but I dont has access to a supported computer. Every conversion technique I try doesnt transfer my attribute table from my ...
1
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1answer
26 views

QGIS 2.4: copying of points to another point layer

in QGIS 2.4 it is not possible any more to copy points of a layer into another layer - I get the message: " Fehler: Objektschreibfehler: Objekterzeugungsfehler (OGR-Fehler: Attempt to write non-point ...
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2answers
51 views

building GDAL with libKML support

I'm attempting to import a kml/kmz file generated using Google Tracks into my QGIS 2.4 system (built with GDAL 1.10). KML files currently lose all attributes, and as such I'm attempting to build GDAL ...
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0answers
36 views

QGIS web client mobile/tablet viewer

I have been looking at OL3-mobile-viewer as an option to make my maps more accessible. Unfortunately I cannot figure out what I need to change to hook it up with my existing QGIS server and ...
9
votes
2answers
115 views

Cleaning blocks pattern from urban LIDAR (blocks uplifted from streets)

We have a 1-meter LIDAR DEM from a city. A small subset can be downloaded from this link: This screenshot shows raw DEM with gray palette (darker belts are streets, and greyish and whitish ...
1
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1answer
37 views

Find lat/lng weighted midpoint from a list of points

Hello I would like some help on a specific task, I am a truck driver and I have an historical list of cities, lat/lng, count where count is the number of times that I've made a delivery in that ...
2
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1answer
77 views

Percent cover from overlapping shapefiles

Apologies if this has been answered elsewhere. I have tried for several days now to come up with a solution to this problem, but haven't found an exact answer that applies to my current situation (or ...
2
votes
1answer
65 views

QGIS select reversed geometries

I have a road network and a geometry for each road direction. One Geometry from A->B and another Geometry from B->A. This geometries are covering each other. Is there a tool available in QGIS to ...
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2answers
57 views

QGIS: Categorized styling - by multiple columns

I´ve got some polygons that I want to colourize by multiple columns. Can this be done or will I have to edit the attributes? Some polygons only have data-attributes in 1 one column, where as other ...
2
votes
1answer
29 views

multi-line attributes in composer

I have a multi-line text attribute in one of my layers, but when I try to display the data using the 'add table' function in Composer, it just gives the text a single line, not enough room to fit. ...
3
votes
4answers
361 views

How to create a new Shapefile with the same attributes as an existing one?

It is quite a frequent occurrence that I want the data I'm about to add to a new shapefile, to have all the same attribute fields as one I created in a previous project. For example, I might have ...
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vote
2answers
52 views

Move coordinates using QGIS

With me I have a csv file. Am using qgis 1.8.5. I added delimited layer to a map shapefile in qgis. I noticed that some cooridates fell out of the boundaries of the .shp file. I selected the ...
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0answers
35 views

Free ebooks of QGIS [duplicate]

I am new to QGIS and python. Can any one tell me, where I can find QGIS and Pyqgis ebooks for free.
1
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1answer
65 views

Could not open/read USGS raster file

I could not open/read the following .img file. The document below says it is a raster file. http://edc2.usgs.gov/1KM/land_sea_mask.php I tried to open it using many ways such as Q-Gis software, and ...
10
votes
3answers
223 views

How can I parallelise embarrassingly parallel GIS operations in QGIS python?

A common requirement in GIS is to apply a processing tool to a number of files or apply a process for a number of features in one file to another file. Much of these operations are embarrassingly ...
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0answers
47 views

QGIS Upslope/Downstream Areas

I am trying to locate areas upstream and downstream of a point of interest in QGIS in order to determine possible areas of origin upstream and areas of impact downstream. I have used a DEM to create ...
0
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0answers
34 views

Syntax Error in qgsapplication file

I am trying to test an QGIS application code example. However, when I try to compile it, it is reporting errors in qgsapplication.h which is coming with the source code of QGIS. I am using QTCreator ...
2
votes
1answer
31 views

qgis-mapserver: GetCapabilities returns no layer

My problem is imilar to this thread I've installed qgis 2.4 and qgis server 2.4 on fedora. I created a simple project containing a vector layer (shapfiles) GetCapabilities request works but there ...
6
votes
2answers
149 views

How do I convert a tweet into a point in QGIS?

I've been doing some research on using R to datamine twitter, but I haven't really found an answer or a decent tutorial for my question. I'm interested in pulling tweets from twitter with a certain ...
0
votes
0answers
21 views

ArcGIS 10: How to mask a raster by using extract by mask tool If the feature mask is larger than the raster area?

I have a problem to mask the the raster which has values ranges -0.73106217384338 - 0.94593381881714. These values have been derived by using equatin (B3-B4)/(B3+B4) from Landsat band 3 and band 4 ...
2
votes
1answer
52 views

How to set default font in QGIS?

Is it possible to modify the default fonts to be used from "MS Shell Dlg 2" to another? If yes, where do I have to set it?
1
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0answers
15 views

How to get value and store it in a variable from a line edit or text edit in pyQT?

How to get value and store it in a variable (in main python plugin) from a line edit or text edit box that were created in QT designer ?
3
votes
1answer
85 views

How to make transparent the background of a WMS layer in Leaflet

I have inserted the following layer from a geoserver in the following Leaflet map : var nexrad = new L.TileLayer.WMS("URL", { layers: 'Wrecks:WrecksGreaterNorthSea', format: 'image/png', ...
3
votes
1answer
61 views

One vector data layer with different styles in QGIS

I have one layer of vector data that I would like to show in two different styles. Is there a way of accomplishing this in QGIS? I've solved it now by duplicating the the vector layer and add ...
1
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0answers
33 views

Error with qgis2threejs plug-in

I am currently endeavouring to use qgis2threejs to create a 3D visual using DSM and orthomosaic data captured using my unmanned aircraft system (UAS). Originally the plug-in seemed to work perfectly, ...
2
votes
1answer
14 views

How to obtain geographic points with a cdv file

I have a xlsx file with a column called CoordX and another with CoordY, I save the file in CSV format (semi-colon) and use the delimited text plugin and follow all the information in the text box. ...
1
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2answers
98 views

How to draw polygons in shapefiles

I've hit a snag and realize this is probably a very simple and basic question, but how do I draw a polygon in a shapefile that I've created from joined points of 2 .csv files? Which specific tool do I ...
2
votes
2answers
33 views

QGIS Forms - How Do I Display a Read-Only Value?

Older versions of QGIS had an "Immutable" option for form fields to make it obvious that data was read-only. How do I display values in the current version and make it obvious that they are ...
1
vote
1answer
79 views

QGIS's raster calculator— running as a batch process?

I have a series of raster files (150 or so) that I need to multiply by a baseline raster. Unfortunately, the series of rasters have a different cell size (30mx30m aka .00027777778 degrees x ...
0
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0answers
19 views

Extracted Contours from DEM translated in QGIS for certain intervals

I created a DEM from several point files in QGIS. Both of these line up well with the remaining data in my file (ie cadaster, aerial imagery, etc). I wanted to generate 2m contours from the DEM ...
1
vote
1answer
48 views

How to load a *.qgs file in a C++ QGIS standalone app?

I'm using QGIS-2.4.0 API to develop a standalone app by C++. I saved a test.qgs file in QGIS Desktop software, in the project, there was one layer and it was visible. Then I loaded the test.qgs ...
1
vote
1answer
43 views

Repetitive behavior in QGIS plugin in connection between Cancel button and pushButton

I'm trying to build a QGIS plugin where I need to ask for a file name using a pushButton connected with a QFileDialog object. I've built a simple plugin using the QGIS plugin builder (putting the text ...
1
vote
2answers
28 views

QGIS 2.4 crashes when symbolizing QgsComposerShape in Python with ScriptRunner

I'm attempting to use ScriptRunner to output a jpeg of a red rectangle using QGIS Composer to understand the QgsComposerShape. Everything works except QGIS crashes when the symbol is applied. The ...
4
votes
1answer
63 views

Is there a public repository of common formating styles for QGIS? Specifically for Tiger data?

I have downloaded the Tiger data for a map I'm working on and wonder if there is somewhere I can download the common formatting styles for these shapes so I don't have to reinvent the wheel. For ...
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0answers
75 views

How to convert length in Decimal degrees to meters programmatically?

I'm new to qgis and I want to find the length of some roads in a map. So I used the following code, from shapely.wkb import loads def getLength(): layer = ...
1
vote
0answers
27 views

Add WMS in QGIS gives an error with Map request failed [error:Host http not found url:http://http//

I got an URL from a friend who is working with Oracle MapBuilder. http://[IP]:11188/mapviewer/wms I tried to get the service via ArcMap and it was working. Then I tried my beloved QGIS and there is ...
2
votes
1answer
25 views

Meaning of r.viewshed output numbers in QGIS?

I have completed a r.viewshed analysis of a point in GRASS7. I have imported the arising Geotiff into QGIS and when viewing the layer in the layer window (after expanding the +) I am presented with a ...
3
votes
1answer
120 views

QGIS Calculate flow length path

I am trying to replicate my Erosion model in ArcGIS for Desktop to QGIS 2.4. I try to calculate in QGIS the upstream distance along the flow path for my agricultural field. I do the equivalent in ...
1
vote
1answer
20 views

Console application in .NET incorporating QGIS tools

I am working on a project where I want to build a standalone application in .NET using QGIS tools. Is there any option like the ArcObjects SDK for .NET? Please help me on this.
3
votes
1answer
55 views

QGIS Topology Checker select errors

I have used the Topology Checker plugin in QGIS to create rules to identify errors in my layer. For example, I have used it to search for all overlapping polygons. This plugin is great for finding ...
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0answers
25 views

how to add different data frames in QGIS? [duplicate]

![enter image description here][1]how can i add different data frames in QGIS and show all data frames in single map like we add different data frames in ARCGIS and in single map we show these data ...
2
votes
1answer
82 views

How to Make an Outside Buffer in QGIS?

I have a layer of street segments that are within a given distance of a fire station. Now I want to make a border around these street segments. If I use Buffer, it puts a buffer around each segment. ...
3
votes
1answer
69 views

Discover multipart features in a layer in QGIS

I am trying to identify multipart features using QGIS version is 1.8.0. I've tried: look at the attributes table select a random feature and check in the canvas if there are multiple geometries ...
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0answers
27 views

QGIS 2.4.0 doesn't support multiple types of geometry in GML file

I'm testing GML 3.2.1 data according to INSPIRE Data specification (version 3.0). Data for theme Cadastral Parcels shall have both polygon geometry and definition point. When I download data from my ...
1
vote
1answer
61 views

QGIS - Identify overlapping polygons in single layer

I have a shapefile of buffered points in QGIS. I need to display all buffer polygons in this layer which overlap. I have experimented with the intersect tool, but this only seems to work if I am ...