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

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Import Aerial Images from Google into QGIS?

QGIS 2.6.1, Windows 7 I am looking to import an image from Google Earth into an existing QGIS project. Is it possible to download geo-referenced images from google maps (or google earth) and import ...
5
votes
1answer
2k views

How to compute Walking and Cycling Isochrone maps using QGIS & pgRouting?

Just installed QGIS as I believe I should be able to produce walking and cycling isochrones from a specified point. I have done this pretty easily before using ArcMap, however, I am really struggling ...
2
votes
1answer
214 views

Revert qgis 2.6 installation to qgis 2.4 through OSGeo4W Advanced installer

It is possible to return to qgis 2.4 OSGeo4W installation when I have qgis 2.6? I want with advanced installer. Thanks,
2
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1answer
81 views

remove unwanted areas which are not inside the boundary of second raster

1 raster layer - global map ; 2 raster layer - berlin I cropped out 1 layer using extent of 2 layer and then overlapped these two layers however I see that 1 layer still has areas apart from ...
2
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2answers
398 views

Call output files in temporary directory through Processing Toolbox (python)

I need to create temporary files as intermediate output to be used with processing algorithms. So, I implemented this: Processing.runalgorithm("grass:v.to.rast.attribute", ........, None) This line ...
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2answers
410 views

Issue in the popdown box (QComboBox) in QGIS 2.6 Python plugin

I had developed a plugin that counts the number of features for a layer in Qgis2.6. When i load a layer say 'Airport' for first time and click the pop-down box in the plugin,it lists the airport ...
6
votes
2answers
819 views

How to symbolize features with NULL values in graduated symbology?

I have a polygon feature dataset, and an attribute from a different table that I join (one-to-one) within QGIS in order to symbolise the attributes as a choropleth map. However, not all polygon fields ...
2
votes
1answer
73 views

Does anyone have any tips on figuring out why a Vector Layer didn't load in Pyqgis?

This is a general question. I'm stepping through the pyqgis code and the layer isValid() is always False. I don't see any error messages showing any reason why it wouldn't load. Other similars have ...
2
votes
1answer
410 views

How to scale SVG symbol based on zoom level in QGIS?

I am wondering if there is a way to scale SVG files I have stored as blob in a Spatialite database according to the current zoom level in QGIS. My hope is to have the SVG icon resize itself when the ...
2
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0answers
171 views

Edit WFS-T layers ArcGIS Server in QGIS

I'm trying to edit layers from a service in ArcGIS Server through WFS-T in QGIS. But the AGS only allows writing in version 1.1 of WFS, while QGIS only connects to the WFS Server in version 1.0, ...
0
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1answer
151 views

QGIS 2.6 Crashed for my own plugin

I had developed a plugin that counts the number of features for a layer in QGIS 2.6. I am using Windows 7 os. It works fine when i loaded a layer. But when I remove that added layer and then if I ...
4
votes
1answer
351 views

QGIS “ERROR 6: No translation for Lambert_Conformal_Conic to PROJ.4 format is known.”

I am trying to clip a county DEM file using the PLSS Section shape files as mask layers... that is, I want it clipped to sections so that I can load my DEM into QGIS one section at a time, without ...
2
votes
1answer
241 views

Command line error and missing dependency in QGIS

I have two problems with QGIS 2.6.1 1) When i am trying to open command line i get error: An error occurred during the execution of Python code: Traceback (most recent call last): File ...
1
vote
0answers
156 views

ArcMap KML Multigeometry to Shapefile

I have been troubleshooting this issue for quite some time now. I have a variety of tools available to me: ArcMap, QGIS, as well as OGR2OGR. Unfortunately, I have not had any success with any of these ...
3
votes
1answer
318 views

overlaying raster layer hides my vector layers in PyQGIS

I loaded vector layers and rendered them without a problem but when I tried to add a raster layer as well the map suddenly only shows the raster image and my vector layers are missing. Anything I can ...
3
votes
2answers
401 views

handling QgsVectorLayer (pyQGis begginer question)

I have a simple question. I am trying to start with pyQgis, but I have found it really hard to get a GOOD api Documentation, simple but yet useful. The one of you who did programming in the old ...
2
votes
2answers
509 views

How to mask labels in QGIS using an inverted polygon?

I created a file consists of a raster (snow load) and a vector with municipal boundaries. I added a vector with the contour lines of the snow load. Labels represent the snow load (kN / m2). With the ...
2
votes
1answer
87 views

Isolate features within buffer of another feature - QGIS

I have 2 shapes - one representing line features of pipes, another of roads. I would like to create a separate shapefile consisting only of the pipes that lie within 20m of the roads. Only the ...
2
votes
1answer
59 views

How to deal with QGIS Time Manager error: no attribute 'animationFrameCounter'?

I am using QGIS 2.6 and using the time manager I get the error shown in the attached pic. Anyone knows what the problem is and could someone offer a solution? Many thanks Nicole!
2
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0answers
71 views

QGIS - line between ordered layer of points - take attributes of both points

I have a series of locations in time in a point layer. I want to make a line layer of lines between consecutive points that takes the attributes (in my case, a timestamp) of the 1 points it connects. ...
3
votes
1answer
804 views

How to generate random points with minimum distances between points in multiple polygons

I am looking to create random points for a random stratified survey. There are three different categories being surveyed; for each, I have a single shapefile, each containing a number of polygons. I ...
9
votes
1answer
436 views

How to visualize measure values along linestrings in QGIS?

I have a series of LineStringM geometries. The measure value represents slope (or stream gradient) at each point in the geometry. I love QGIS's robust styling options, but I can't find a way to render ...
0
votes
3answers
1k views

Unable to run R in QGIS 2.6 - rgdal unavailable for R 3.1

I'm attempting to use R within QGIS2.6 on OSX Mavericks but cannot get R to run because rgdal is not available as binary for R3.1.2 (see QGIS log output from R execution console below). I have ...
0
votes
1answer
248 views

QGIS - Understanding how to georeference NAIP CCM jp2 images with lat/lon

I'm a very new QGIS user and no GIS expert. I am having trouble getting jp2 images to align with a vrt raster I've created from SRTM images. What I'm trying to do: Overlay SRTM data with ...
0
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1answer
189 views

QGIS 2.6.1 doesn't load python plugins on Ubuntu after upgrade [duplicate]

I have experienced this scenario once before and now today, whenever I updated my QGIS installation on Ubuntu, it didn't reload python plugins under ~/.qgis2/python/plugins when started, only c++ ...
2
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2answers
536 views

Loading Vector Layer using python console in qgis

I am using qgis2.6 version and new to pyQGIS. I tried to load a vector file using python console in qgis. I don't know where I am wrong. The layer was not loaded and does not show any error too. Help ...
0
votes
1answer
92 views

QGIS Crashes when I connect to QGIS Cloud [closed]

QGIS crashes when I try to connect to QGIS cloud. I just signed up for the cloud service - still testing out the free version. When I try to connect through the plug-in panel (I use no proxy server) ...
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0answers
61 views

How to cut parallelogram with intersecting line?

I have a very specific set of circumstances under which I need to break a parallelogram into 2 pieces. The parallelogram obviously always have 4 vertices and the intersecting line intersects the ...
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0answers
89 views

Tiff Raster File slow to Load in Win 7 64 Bit QGIS 2.6.1

I have been unable to load a Geo Referenced Tiff file in 2.6.1, I have found it it will load but takes minutes, It will load quickly in 2.4 It is a Lidar file so it is large, about 14 gb in size, I ...
3
votes
0answers
639 views

why in my processing of qgis not exist the module Catchment area (Parallel)?

I have qgis 2.4.0 chugiak and have install processing but in the box of tools not exist the module catchment area (parallel), how to install this module? thank you !!!!
0
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1answer
112 views

Combine Elevation Raster and MultilineString to create MultilineStringZ in PostGIS

I want to show how steep a given stream is. I'm using PostGIS and QGIS. I do not have access to ESRI products. I have some ideas, but I'm not entirely sure how to proceed, and some of my assumptions ...
3
votes
1answer
85 views

Why is QGIS rounding off manually added decimal attributes?

I am manually adding a decimal column in qgis and set the width and precision to one more than I actually need (Width: 5, Prec: 5)so the number comes out as 0.XXXXX, but when I save my eidts qgis is ...
4
votes
1answer
275 views

Identifying south facing mountain land, above an elevation, within a slope range, less than fixed distance from major roadways

This odd question comes from believing that such an analysis is plausible in a GIS system. Only, I don't how to accomplish the various discrete steps implied from the Title, nor where to get a topo ...
3
votes
1answer
122 views

QGIS Dissolve tool re-projects and rotates layer

I'm trying to use QGIS (2.6.1-Brighton) to aggregate polygons according to an ID attribute. I'm using the shapefile of school district polygons in Michigan found here: ...
2
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0answers
83 views

Trouble merging 2 rasters using qgis

I am trying to merge two rasters using the "merge" tool on Qgis 2.6. Qgis does complete the process, but the resulting image only shows one of the two rasters with the rest of the extent with really ...
3
votes
1answer
196 views

Calling canvas.saveAsImage from script in QGis -Qstring problem

I want to create a processing script that saves the QGIS MapCanvas exactly as it is seen on the screen and then Zip up the tifw and a created PRJ. The existing QgsMapCanvas.saveAsImage()-method does ...
3
votes
2answers
234 views

How to merge same long lat points with different data into a unique one?

I have a layer where there is more than 1 feature for a same object. Imagine i have a layer called signals. There can be up to 10 features in the same place (long/lat) for a unique signal but the ...
3
votes
1answer
63 views

Can QGIS 2.4 follow symbolic links to load data on Linux?

Q. Can QGIS 2.4 [Edit: NOT 2.8, brain-freeze] follow Linux soft links? I want to add a number of raster layers from a store of NED30m elevation data, and thought I'd do it by creating a collection ...
1
vote
1answer
680 views

Web map viewer for QGIS Server and PostGIS

I have succesfully installed and configured QGIS Server. I tried WMS and WFS via QGIS Desktop and it works perfectly. Now i am looking for a web map viewer to display (only read (WMS viewer i ...
2
votes
1answer
356 views

Colormap to grayscale map using QGIS? [duplicate]

I need to export color orthophoto map to gray scale geotiff file using free tools (like qgis) any idea? I tried qgis preview but this does not produce new geotiff file
2
votes
2answers
164 views

Adding new fields to shapefile alters appearance of borders in QGIS?

I am using QGIS 2.6.0-Brighton and I am trying to add a custom field to my layer made from a shapefile of Italian provinces; everything seems fine when I create a categorized views using region codes, ...
2
votes
1answer
430 views

Distance to nearest hub output not correct

In QGIS 2.6, I'm working with two point layers: center of the population per census tract and stores that accept food stamps. I'm using "distance to nearest hub" to calculate nearest food stamp outlet ...
1
vote
2answers
231 views

Georeferencing PNG with transparency via gdal produce “green pixels” in QGIS?

This is just intriguing while not blocking my way, but I wonder what is going on and would like to get feedbacks from more experienced users. 1) Given a trans.png file (1.1MB) looks good and ...
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vote
4answers
605 views

why Input layers do not have the same grid extent in the processing, hydrological analysis?

I'm trying to generate the hydrological analysis using processing and I have already done some terrain processing using the DEM. In this moment, I'm working in he channel network but, when i assign ...
1
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1answer
109 views

Finding a vertical kilometer between 2 points with specified distance in QGIS

I'm new to GIS software. I want to find 2 points in selected area (lets say Czech Republic) with distance 5km or less and altitude difference 1000m or more. I know that I can use GMTED datasheet with ...
2
votes
2answers
333 views

QGIS equivalent for ArcMap join for purpose of distances from points to polygon?

It is relatively easy to calculate distances from points to a polygon in ArcMap by doing a join and selecting the option for creating a field containing the minimum distance information. i.e. it ...
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1answer
123 views

Qgis corrupted excel file, possibility to repair?

I had an excel file with several data which I imported into Qgis as a layer. For some reasons I had to change the data type of one coloum so I created a new one and imported data from the first ...
0
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0answers
44 views

ST_Touches Function in Iterative Process

Im a complete newbie to postgis. I have the following problem: Got two tables: "mp_power_lines_new" -> contains lines of an electricity grid "uw.new"-> contains polygons of all substations in this ...
4
votes
1answer
2k views

How to Install QGIS 2.6 plugins offline

"Due to various IT policies at my workplace, QGIS is installed on a machine (Window 7, 64bits and QGIS 2.6) that is not connected to the internet. I wish to install a couple of QGIS plugins on this ...
2
votes
1answer
93 views

Object Inspector Button not enabled in python console of qgis

I am using QGIS2.6 version. I loaded an existing py file in a editor. Though I added a codes in the editor, the object inspector button was not enabled. Please help me in figuring out what would be ...