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

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30 views

Road Graph Settings

I am unable to configure road graph setting. in "Plug in Menu" there is no road graph settings but it is already installed. Please tell me how to solve this problem.
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1answer
185 views

QGIS raster calculator manual or help

There is plenty unknown about how to use raster calculator, for example: how to write NODATA (Null) value in expression is it possible to use within (polygonLayerName) to clip result between shown ...
3
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3answers
2k views

How to get shapefile of river from OpenStreetMap?

I dont want to download whole map of an area. I just want rivers and other waterbodies present in an area in shapefiles so that I can use them in Qgis. I tried geofabrik but it is giving whole map and ...
2
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0answers
230 views

Can't see Postgis layers added to QGIS

I'm trying to transition from an old Postgres/Postgis database to a new one. I'm working in a fresh install of Win 7 64 bit. I installed Postgresql 9.3 32 bit, then installed PostGIS 2.1.3. I created ...
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1answer
87 views

How to add point attributes to containing polygon?

I have three layers in a QGIS project: layer 1 is a boundary layer of polygons each with and id I will call "p_id" layer 2 is a point layer each with an id called "p_id" layer 3 is a .csv layer ...
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0answers
88 views

Create GeoTIFF for a specific scale

I am working on creating several GeoTIFFs in QGIS. My workflow was to: 1) Export the PDF map at the desired scale (1:64m) 2) Design the map and export the TIFs from Photoshop (I've used several ...
2
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2answers
1k views

How to enable multithreaded processing in qgis 2.2

I have found multiple links that appear to say that this now exists in qgis 2.2, but it appears that it's only using one core to full capacity. This is running on Ubuntu 14.04 The current process is ...
2
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1answer
307 views

QGIS Python Scripting - Syntax definition

After playing around with the Model Builder and looking at the python scripts of what I make, I noticed some syntax which I can't find the definition anywhere. Here is a snippet of the python script ...
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0answers
54 views

Open Source .Net GIS software end-to-end

I need to provide a client with an end-to-end web-based GIS solution running on IIS. I will admit to not knowing much about the subject, other than having developed a Google Earth enabled version of ...
3
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1answer
193 views

How to connect two line ends in QGIS without resorting to other software?

I have two adjacent (ends meet to make one line) polylines in QGIS. I need to properly connect the two ends of the two sections. I've tried the obvious (and less obvious too) but QGIS won't forget ...
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0answers
167 views

change default font of labels in QGIS

I've just opened a feature request, but maybe someone knows a temporary solution. In QGIS 2.2 one can change the default font of the Print Composer (through the Menu Option -> Setttings). But I think ...
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1answer
58 views

style creation in QGIS

I want to create a line style in QGIS (model is attached here with), Any body can help me?, please help me.
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1answer
101 views

QGis export part of map (box with coordinates) as raster

I would like to export a map of Switzerland (as part of googlemaps) to use as a background for a graph, but I need to know exactly where each corner of the map corresponds to (wrt spatial ...
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2answers
214 views

User defined Coordinate Reference System (CRS) in QGIS is not located where expected?

I have received a shapefile with a user defined projection (i.e., +proj=krovak +lat_0=-32.923433 +lon_0=116.47485 +alpha=111.423433 +k=1.00004 +x_0=44328.529781 +y_0=1345943.211845 +ellps=GRS80 ...
1
vote
1answer
558 views

Opening *.pmf file using QGIS?

I have spatial data that has been put together with ArcGIS for Desktop and exported to me as a .pmf file. I'm spearheading a complete move from ArcGIS to QGIS and trying to make our old data still ...
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0answers
309 views

How to print a WMS map with chosen scale and WMS zoom level?

I am trying to print a WMS map in QGIS. If, while in the print composer, I chose a "25000" scale, the composer chooses a WMS layer that actually shows a 1:50000 map. To get down deep at the 1:25000 ...
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1answer
715 views

Spatial Join in QGIS 2.2

I am trying to spatially join point layers of some 12,000 women interviewed in Egypt to Egypt's polygon layers (administrative districts boundaries) using QGIS 2.2 and need some advice. I am a QGIS ...
0
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1answer
93 views

PyQGIS: How to send signal to call unsetMapTool()

I've created a map tool to add some functionality to adding point features in QGIS 2.0. I'd like to unset this map tool if editing has manually been terminated by user. I've attempted as shown below, ...
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1answer
89 views

Add attributes to an output shapefile schema (via meta)

I am trying to copy the schema of an existing shapefile and add to it in an output shapefile. Somehow I am not getting anywhere with this...though the docs seem very clear (and the download page : ...
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0answers
72 views

How to overlay polygons that are in the same layer

I need to INTERSECT many polygons that are in the same layer. Actually each polygons from my layer represent an area of influence from one specific bird species. Since I used to use ArcMap, I found ...
0
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1answer
122 views

QGIS convert polyline to fixed width polygon

I have a shp file of polylines for trails, and I need to convert them all to be polygons that are 8 ft wide (4 ft from the center of each side of the polyline). I tried a following a few other posts ...
5
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3answers
244 views

How to get QGIS to play with pandas (Windows)?

has anybody been successful getting pandas to work with QGIS's Python installation, on Windows? I've used the OSGeo4W installer to install QGIS2.2, which comes with Python 2.7 and Numpy 1.5.1. Any ...
2
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1answer
248 views

Error: Algorithm not found

I wrote the following code to start using QGIS APIs. in a very short script seen below, the "Error: Algorithm not found" is thrown and "print processing.alglist()" is showing none. Any idea why this ...
3
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0answers
77 views

QGIS : launch Atlas composer generation from command line

I am using QGIS 2.2 and have configured a composer with atlas generation. I would like to launch this atlas generation every day. The idea is to write a batch and launch it with a cron. Is it ...
0
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1answer
63 views

georeferencing an image from GoogleEarth

What I actually want to do is very simple, however, there seems to be a bug: I have an image from GE which I want to georeference and set as a background layer. I thus set some placemarks on GE, ...
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0answers
180 views

PyQgis: How can I “append” features to a Vector Layer instead of “stacking” them?

As I read data from a text file and add points to a QgsVectorLayer (as well as related attributes), each new record gets 'stacked' on top of the previous one in the Attribute Table (and within the ...
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0answers
53 views

Slope regions from elevation points using QGIS 2.0

I am using QGIS to create a layer of slope region polygons (e.g. less than 30% slope, 30-50%, more than 50% categories). My data comes from point elevations and I interpolated using SAGA b-spline ...
2
votes
1answer
138 views

Getting length data from GPX files within QGIS

I just got a Garmin etrex and promptly took it for a hike. I can get the path and the trackpoints into QGIS with no issue. However, I cannot figure out how to get the distance between the ...
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3answers
425 views

Import DEM into PostGIS for QGIS

I'm a complete GIS newbie so sorry if I'm using the wrong terminology in searching for a solution to this... I'm trying to import a DEM into PostGIS and display it in QGIS. The data is from the EU-DEM ...
0
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1answer
133 views

DN value from raster to vector tool (QGIS 2.0)

I am using QGIS 2.0 to convert a DEM to vectors, then create polygons of zones of slopes. However, I am unsure of in what units my new "DN" column is. It has lost of precision of z-values from my ...
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0answers
203 views

NDVI from QGIS is giving me NaN values

When I use QGIS' "slope based VI calculation" for Landsat 8 IR and Red bands the resulting NDVI and TTVI maps are all NaN values. When I do the NDVI calculation using the raster calculator it looks ...
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4answers
2k views

Split Lines at Intersection of Other Lines

I have two line layers (roads and contours in this example) and I would like to split the roads layer every time it crosses/intersects a feature on the contour layer. I can't seem to find a tool that ...
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1answer
69 views

Integrate static database with spatial database

I have some questions about how to integrate static database with spatial databases. problematic: I have several static data bases on different platforms (Oracle, MySQL, SQL Server) I want to turn ...
1
vote
1answer
528 views

Iterating over selected features in QGIS Processing

I used to be able to iterate over selected features using the following script in v2.0. import processing features = processing.getfeatures(layer) for feature in features: #Do whatever you need ...
1
vote
1answer
51 views

Rectangle polygon is displayed as triangle

i am wondering why a rectangle polygon that i have created on an official german surveying website (downloaded as compressed shape in a zip-file) is displayed as a triangle when loaded in qgis. mighty ...
0
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1answer
128 views

Blank Shapefile output?

When executing the following command string in the active browser, Qgis projects the triangle polygon and associated attribute table correctly. Upon reopening the shapefile in a new browser, the ...
1
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1answer
230 views

OpenLayers Plugin with on-thy-fly-transformation causes wrong coordinates

I am using the OpenLayers Plugin with the maps from Google Satellite. In Qgis I have chosen on-the-fly-transformation into WGS 84. But the WGS 84 coordinates in Qgis are now 0.15 degrees further E ...
0
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1answer
150 views

Programmatically set layer properties Python Init function

Is it possible to set the layer properties Python Init function field programmatically? I've been looking through the qgis 2.2 api but can't seem to find anything on it. Hint, suggestions and ...
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0answers
62 views

GPS positional, and quality data collection using QGIS

I was wondering if it was possible to record the position along with some of the quality control data in a table when using the GPS information functions to collect some mapping data. I would like to ...
1
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1answer
99 views

generate massive shapefiles

I have a shapefile with 1475 records, and I want to generate a shapefile for each record. What can I do to generate them avoiding selecting and exporting each record to do that?
1
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1answer
114 views

How to close spaces within a polygon in QGIS 2.2?

I have a shapefile displaying the borders of several city units. One of its polygons, however, had free space consisting of four vertices in it. I created another polygon inside the free space and ...
2
votes
3answers
130 views

Mis-aligned shapefiles

I'm a beginner at QGIS and I'm having trouble aligning my shapefiles. I have two datasets: one originally in WGS84 (lat/long) and another in Corrego Alegre/UTM zone 24S. I need to convert the second ...
6
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1answer
3k views

Problems installing QGIS 2.2 on Ubuntu 14.04

After major upgrade to 14.04 I tried to purge and reinstall QGIS. Unfortunately I get and error (full listing below) and cannot finish clean installation. Information in the log points errors to ...
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0answers
89 views

Highlight paths between two points

I'm new to qgis and very sorry if this is a simple question to ask. IS there a way to highlight the available paths (roads) between two selected points in a road map(in qgis) ? I want to find the ...
0
votes
1answer
179 views

Copy .prj file into QGIS projection folder

I want a custom projection used in ArcGIS be available in QGIS. I have the .prj file copied out of a ArcGIS folder (containing different projections). Now, I want this file to be added into QGIS. Is ...
2
votes
1answer
218 views

Import error when utilizing QGIS's Python Init function

Based on the answer to Referencing Qt UIs external to plugin with python. I'm trying to utilize the "Layer Properties / Fields / Python Init function" to execute a file (test_file.py) that is located ...
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0answers
64 views

QGIS API changes from 2.0 to 2.2

I have the same program running on two different machine, one with Qgis 2.0 and the other Qgis 2.2. The machine running 2.2 doesn't seem to render the map canvas. I thought it was how I has creating ...
0
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1answer
97 views

How to delete an edge in QGIS

I have used the Lines to polygons tool to turn a city boundary linestring feature into a polygon. However, the tool has connected some nodes more than one time, resulting in multiple edges . I would ...
2
votes
1answer
242 views

How to style the end of a line?

In the picture you can see, the red lines i added manually. These are the ends of the lines. To distinguish that there is the beginning of a new river segment, i would like to have something like ...
7
votes
2answers
751 views

How to extract vectors from map using QGIS?

I am trying to extract building footprints from a raster map (as shown in the example below). Please note that the maps are out of copyright, have been scanned and georectified by a library and have ...