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

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2
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1answer
54 views

Geometry in QGIS 2.6

This might be a beginners question, but I could not find an answer on the internet. I drew a couple of polygons in a vector layer and I am trying to get some basic geometric information into my ...
2
votes
1answer
44 views

How can I open a jpg format with QGIS 2.8?

I'm having some difficulties opening the jpg format at QGIS 2.8. It opens, but nothing appears. Thanks for your help!
1
vote
1answer
59 views

Creating polygons layer from point layer with conveks buffer

I have a point layer of >750000 points representing dwellings with district heating. Now, I want to create polygons for every n of points with a distance of n meters to the next point. I have a ...
2
votes
0answers
94 views

QGIS server 2.6.1 upgrade to 2.8.1 error

I plan on upgrading QGIS server from 2.6.1 to 2.8.1. At the time of 2.6.1 is used, however, to 2.8.1 found the map service can not be used, the emergence of internal server error 500. ...
2
votes
1answer
27 views

Loading Raster using QGIS API in Windows

I am trying to develop a C++ application using QGIS. I have to load a tif file and show it. First I wrote an app similar to samples on the internet. It works on Linux, but it does not work on ...
0
votes
1answer
57 views

QGIS 2.8 Convert a vector to a raster layer

When I change a vector layer to raster using raster button->converse->Vector rasterization in QGIS2.8. I get only a black picture. Why is that so and how can I convert a vector layer to a raster ...
0
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1answer
18 views

How to turn a vectorgraph into raster correctly?

In QGIS2.8 version, I added several points in a point vectorgraph. When using the grid - > Conversion - > rasterized vector , The results turn out into a black figure. How to turn a vectorgraph into ...
1
vote
0answers
29 views

Wrong Scale Bar in Map Composer

I am attempting to add a scale bar into QGIS Map Composer for a single layer showing a map of Jervis Bay, NSW Australia. I have changed both the project and layer CRS to 'MGA56 (EPSG:28356)' and have ...
1
vote
1answer
172 views

Openlayers not rendering on QGIS 2.8

I uninstalled QGIS and removed all files on the computer with QGIS in them. I then reinstalled version 2.8. I still get the same problem that google streetmaps does not display. When I try one of the ...
1
vote
1answer
39 views

Qgis raster calculator not giving output

I want to calculate some result using QgisRasterCalculator and using the code mentioned below.Problem is i am not getting any output raster also if i use this formula in raster calculator it gives ...
1
vote
1answer
39 views

CAD line drawing to GIS polygons

I'm a (reasonably) proficient GIS user (mostly QGIS, but some Arc GIS) who has been thrown the conundrum of converting/importing CAD urban planning drawings (2D drawings produce in AutoCAD 2014) to ...
0
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0answers
26 views

Parking analysis using QGIS or ArcGIS for Desktop? [duplicate]

From the data I have: parking zones, the number of parking spaces per parking, number of parking per month for each parking lot, and the average price of parking for each car park. In addition I have ...
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0answers
41 views

polygon shapefile R extract issues

I'm trying to do simple RF classification in R based on https://gis.stackexchange.com/a/39103/48810. The code I am using is as follows: require(sp) require(rgdal) require(raster) ...
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votes
0answers
83 views

Problem with installing qgis server

I tryed to install the qgis server on my windows 7 64x machine. i follow the link of anita graser and run the osgeo4w setup for the 32bit version. I installed apache und it works fin, but the qgis ...
2
votes
1answer
38 views

How to import the “QGis” class in a script?

I want to check which type of geometry the current layer has. Therefore I use the PyQGIS documentation on Access to Geometry and my code looks like: if iface.mapCanvas().currentLayer().wkbType() == ...
2
votes
1answer
28 views

QGIS 2.8 Labels are lost when setting map rotation with crs on the fly

I was working with QGIS 2.8.1. When I set the map rotation in canvas the canvas rotated as wished but all the labels were lost. I found out if I disable CRS OTF(on the fly) all the labels will be ...
3
votes
1answer
64 views

QGIS 2.6 summarizing area (m²) for current atributes

If I have a code for each polygon and I have counted the area in m² for each of them (all this information is in single columns). How can I summarize these areas by codes (for example summarize all ...
1
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0answers
27 views

QGIS Atlas generation - Export atlas as images - only JPEG, want PNG

I can't find an option to choose image format while exporting Atlas, choices are Export atlas as images / as SVG / as PDF The dialog that opens has no options and it always exports as not so good ...
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0answers
18 views

Incorrect Acreage QGIS 2.6.0

I have six polygons, all of (fairly) similar size. The first one is 8 acres, the others are obviously wrong with 120,000 acres, and 106,000 acres and so on. I am calculating with the field calculator, ...
2
votes
1answer
92 views

Polygon centroid coordinates update error

After a week of unsuccessful fighting I'm forced to ask for your help. I have created a table 't_excavations' with fields 'id_excavation', 'geom' (MULTIPOLYGONE), 'longitude', 'latitude' CREATE ...
1
vote
0answers
36 views

heatmap dislocated when generated [duplicate]

QGIS 2.8.1 Does anyone have the answer to why a generated heatmap appears without coordinates and therefore is not on top of the vectorlayer that it was generated from? I checked the CRS setting but ...
0
votes
1answer
19 views

Problem moving layers in QGIS

Just wondering if anyone ever experiences any problems moving layers? I have set up QGIS in the office and it works brilliantly for everyone apart from one of my colleagues who finds that on odd ...
0
votes
0answers
9 views

GRASS_INFO_ERROR(16605,1) while running a GRASS tool

I have a fresh install of QGIS 2.8.1 with the GRASS plugin on Ubuntu 14.04. I opened the mapset I've created in QGIS 2.6.1 on Windows 7. Then I tried to run v.in.ascii Grass tool and I got following ...
2
votes
1answer
24 views

Polygon shapefile field calculator problem

My project is set in WGS84 only, and I have checked 'enable on the fly'. I have created a polygon shapefile and my problem is that when i use field calculator in the attribute table on my polygon ...
1
vote
0answers
24 views

Update shapefile name with layer name

I had a layer that I split by fields. The resulting files were given a name. I updated the names of the resulting layers in QGIS but have realized that the shapefiles have not been updated ...
1
vote
0answers
11 views

Configuring Identify Feature Tool in Geomoose

Currently,i am workiong on geomoose.And i Faced a problem with the identify tool.Plotted some point data in geomoose and the identify tool displays more than one result for a single point.Is this ...
0
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0answers
20 views

Overlay polygons on raster in different projections

I'm overlaying polygons on a raster to get the average value inside the polygon (using SAGA->Shapes-Grid->Add grid values to shapes in the QGIS Processing Toolbox), using a geographic and a ...
1
vote
1answer
30 views

Connecting polygon accidentally deleted - filling in the gap

New QGIS user, Brighton 2.6. I accidentally deleted an elongated (lots of "peninsulas" polygon that represents a stream-based habitat - two gaps on SW boundary and two on the northern boundary ...
2
votes
1answer
51 views

Euclidean direction

i'm trying to calculate the euclidean direction, in ArcGIS its very easy using the Euclidean Direction tool of Spatial Analyst but in QGIS i don't find how to do it. Any tips for this in free ...
0
votes
1answer
107 views

QGIS: How to add a second polygon that is exactly 5km larger in all directions?

Given is a map with an airport. Within a distance of 5km around the runway there is a so called no fly zone for drones (in Switzerland). I want to show this zone in a map. What I would like to do is ...
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0answers
36 views

QGIS shape file crop

I have a big shape file with greece roads network and i want to extract from it only one part of an island of Greece and make an new shape file with only the attributes of the island.
1
vote
0answers
27 views

QGIS Desktop 2.9.0 - ZoomOut doesn't work [closed]

In the QGIS Desktop 2.9.0-Master the Tool "zoomOut" doesn't work. The "zoomOut" have the same operation of the "zoomIn". This is a bug? I don't know where I report this bug, because I know the 2.9.0 ...
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0answers
24 views

Which VS projects are needed for a custom QGIS build?

Environment: VS 2010 Win 7 QT 4.8.6 QGIS git Src OSgeoW4 I have built the source for QGIS, in order to use it as a base for a custom application. I wanted to know what projects are 100% ...
2
votes
0answers
38 views

QGIS distance from point to line along a specific bearing

I've got a vector layer with points (representing customer locations) and another vector layer with a line (representing the coast line). I want to calculate a "smart" distance to coast. Specifically, ...
0
votes
2answers
33 views

add attribute information from polyline to a point shapefile (QGIS or ArcGIS)

I was wondering if, and how, it is possible to add attribute information from a polyline to a point dataset. I have a network layer with information per street how many scooters went over this street. ...
1
vote
1answer
30 views

QGIS how to save loaded min/max values for raster layers?

I am working with many layers. Each time I open my saved project, I must reload the min/max (properties/style) values. Is there a way to turn off the default 2% cut?
0
votes
1answer
56 views

Heatmap is upside down

I have a point file saved as a shapefile, now I want to produce a heatmap of the values. However the heatmap is projected upside down. I suspect my y coordinates are inverted or negative but I do not ...
1
vote
1answer
56 views

Is there a way to save a spatial join as .sqlite?

I'm joining data from PostGIS and SpatiaLite databases in QGIS using the "Join attributes by location" (Vector -> Data management Tools) tool. However, this has a big limitation - I can only save the ...
1
vote
1answer
30 views

Trouble calculating attribute values in pyqgis [closed]

I recently posted another question about calculating unique IDs for features using python and qgis here Calculating unique ID value for a field in QGIS using python. I am trying to use the same ...
1
vote
1answer
30 views

How to erase polygon from another in QGIS

I want to erase the pink polygon from the blue polygon. I've tried clip, difference, and symmetrical difference. Clip produces an empty polygon. Difference produces just another blue polygon.
1
vote
1answer
83 views

Connecting Data to GIS

Issue 1: I have been working on the re-evaluation of a Late Woodland Palisaded Village in southwest VA. The site map as been digitized in CAD. The original grid has been followed. The excavators did ...
2
votes
1answer
54 views

How to suppress polygon boundaries shared by objects of same type in QGIS?

Given polygons - like landcover in OpenStreetMap or street areas in cadastre - how can one suppress those polygon boundaries which are shared by objects (features) of same type in QGIS (see figure ...
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vote
0answers
17 views

Print boundaries of one layer over another [closed]

i am new to QGIS. I have a base map from google, openstreet map over which i want to show the boundaries of another layer. How can i do that? While trying to edit, is it possible that QGIS allows to ...
0
votes
1answer
23 views

Automatize adjust polygon bounds based on other polygon

I have two polygons, as below: Does exist an automatic way to adjust the vertices of Pink Polygon near of Blue Polygon bounds to Blue Polygon bounds?
3
votes
2answers
148 views

How to ask QGIS to provide upgrade for your distro?

Here I am at StackExchange because QGIS itself doesn't seem to have forums I can ask at. I effortlessly installed QGIS 2.4 and upgraded to 2.6, for my Linux Mint 16, because I just had to put ...
0
votes
2answers
57 views

US map shape distorted in QGIS

I am very new to QGIS and mapping. I am trying to load a US state map shapefile in QGIS. But the problem is it does not look like another US state map available on the internet. The upper part looks ...
1
vote
1answer
54 views

QGIS SAGA Raster Calculator

I am using SAGA --> Grid Calculus --> Raster Calculator on QGIS version 2.6. The formula I am using is: ifelse(gt(a,0), (a), b) where a is my layer with values in a greater extent than that of b. ...
0
votes
0answers
17 views

How to analyse large datasets of street lines to regularly track changes and find mismatches

I am new to working with streets data and am currently looking for the most effective method to analyse the quality of street datasets that are regularly updated and changed. At the moment I am ...
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0answers
39 views

Microsoft Visual C ++ Crash when Install qgis.2.8.1

I have installed and reinstall QGIS ver.2.8.1. and always display a message as shown below. I hope someone can help me fix these problems. Thanks for your help.
1
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1answer
30 views

Problems opening ASC files in QGIS

I am trying to open an .asc file (pick, for example, that one for 2014) from the German Federal Ministry of Transport and Digital Infrastructure. It contains information on the annual solar radiation. ...