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

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1answer
58 views

Receiving GDAL Clipper Error from QGIS? [duplicate]

I realise there has been quite a lot of discussion on this topic and have already read through the suggestions on this forum of how to rectify this problem, but still nothing has worked. I am ...
2
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1answer
40 views

Working Windows Standalone .EXE From QGIS Python Script Using PyInstaller?

Has anyone been able to create a working standalone Windows .EXE file from a QGIS Python Script Using PyInstaller?
1
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1answer
39 views

QGIS2web page does not display curved labels

I have designed a non-real map, using QGIS. Until now, my map was very basic (a few layers with some polygons, dots, and lines). This map is a "decal" from a raster image. I recently add some custom ...
1
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0answers
29 views

Measuring in Print composer and main layer window in QGIS 2.12.3 does not match

I work on the municipality level and I am composing print maps with scalebar. I noticed, that length (or scale of my maps) is presented different when items are measured in my main QGIS 2.12.3 layer ...
1
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0answers
39 views

QGIS on Surface pro 4

I’ve just installed QGIS on my Surface pro 4 and I have a second big screen. So when I put the QGIS on the big screen the user interface is blurred. Can you help me?
2
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1answer
42 views

Is it possible to show data when hovering over an item with qgis2web (OL3)?

I'm using the qgis2web plugin and I want to show the records behind the different items on the map when I am hovering over them. Is that possible when you have layers devided into groups? And my ...
1
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3answers
56 views

QGIS export feature coordinates

I have a big project (whole country) and it contains smaller features (administrative units). My project is in .shp. How to export features' coordinates one by one or all at once as long as all ...
1
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1answer
45 views

Reprojection issue from WGS84 to UTM32

In QGIS I want to transform a point shapefile from WGS84 to UTM32 (EPSG:4647). The result moves the point from somewhere in Norway to a position off the coast of Congo, Africa. Can anyone explain ...
3
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2answers
155 views

Find points that are unique between two tables

I have been trying to work out a query that returns the geometry of points that are unique (eg. not supliacte). Is there a simple way to perform it in just one query? geom is the only common ...
2
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1answer
50 views

QGIS modeler: Error when extracting by non existing attributes. How to avoid displaying of error?

I have a problem with the QGIS modeler: The idea is to extract attributes ("DN" between 40 and 44) out of one layer. I want to use the outcoming layer for further algorithms. I calculated with ...
1
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0answers
35 views

How can I calculate times with gps data using random points on the track? [closed]

I have GPS data from a car that is circulating all the time in a closed circuit. I need to put a few points along the route, about 3 or 4 and calculate the time it takes to get between points. These ...
1
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1answer
28 views

Why doesn't Ordnance Survey street view raster layer appear on qgis map?

I've downloaded the relevant 100 km square of OS Street View raster data and have added the relevant 5 km square to a QGIS 2.8.2 map of scale 1:1500. The layer can be seen in the layers menu but not ...
3
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0answers
23 views

Can't open my saved .qgs file in QGIS [duplicate]

When I try to open my .qgs file I get the following error: It says that the project can't be opened, and that something is wrong when trying to read the project file, this is my translation. Can I ...
5
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1answer
87 views

Sequentially distilling several raster data sets into final map based on first time pixel’s value was greater than zero?

I have 120 daily data sets that contain a value only when a threshold temperature is exceeded. If the threshold has been reached that pixel was assigned a value indicating the day it occurred (the ...
1
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1answer
26 views

Changing legend label when cycling through Atlas created with QGIS composer

I have project which gets updated regularly and can have multiple areas which need to be mapped individually to go into separate reports. I generate an atlas in the composer and I have created a ...
1
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1answer
27 views

How do you view data contained inside hidden directories with QGIS browser?

I am attempting to browse data in a hidden directory, but the QGIS Browser tree view doesn't show in hidden folders? I know, I know...it's hidden. But is there a command-line switch to override this ...
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0answers
3 views

Retaining Raster Point Data Using wms [duplicate]

I have a single band raster being served via geoserver wms. When I view the raster through geoservers built in openlayers viewer I get different point value results than if I ask geoserver for a ...
4
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1answer
64 views

QGIS Finding valves to turn off for water lines

I am wondering if there is a tool for QGIS that can do what I am about to describe. It might be in network analysis but I am not sure. I have used water gems but it does not do what I want it to do. ...
1
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2answers
84 views

Export/Convert .tif + tfw into GeoTiff with tagged Metadata (coordinates)

What is the correct command line for using warp_management in Python (ArcGIS 10.1), to convert several georeferenced .tif's (or folders) with XML world files to GeoTIFF's with permanently written ...
2
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1answer
36 views

How to avoid point stacks?

When geocoding a dataset of about 500 adresses I get a vector point layer. As far everything is fine. The problem is, that the dataset contains multiple entries with the same adress. The result is a ...
0
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1answer
42 views

pyqgis: Add GeoJSON as editable Layer

following GeoJSON should be added to QGIS as an editable Layer: ...
3
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1answer
30 views

QGIS - Field Calculator: scale_linear gives unexpected result

When I try to use scale_linear, its output isn't as I expected. My values are from 1 to 16, so I set domain_min = 1 and domain_max = 16. I want to interpolate to interval from 1 to 4 so I set ...
1
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1answer
49 views

Map composer issue

I am using QGis (latest version, OS X) and whan I create a map on map composer everything works fine. I export the map to pdf file and also goes fine. But when I save and close it and then close the ...
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0answers
30 views

QGIS - Alternatives to Offline Editing Plugin

I am looking for a way to edit my postgis layers offline (in field) using a Microsft Surface Tablet. I have been testing the "Offline Editing Plugin" unsuccessfully. These are the issues I have ...
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1answer
41 views

QGIS Installed Components

We have QGIS installed and our users have roaming profiles. Some of the files which are installed under the .qgis folder in the C:\Users\username directory can grow quite large. These large files ...
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0answers
30 views

QGIS GeoSearch Plugin Issue

We are trying to use the QGIS GeoSearch plugin and intermittently receive issues with it. We know what the cause is and we wondered whether anyone else experienced this issue and had a solution? We ...
1
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1answer
28 views

How to create a grid point layer from a txt file in QGIS?

I have a ascii file (.txt) with the following columns ID, long, lati, value where long, lati are the coordinates (long/lat) of the cell centres of a LAT/LON grid with resolution of 30 arc seconds. ...
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1answer
34 views

Repositioning DXF Imported into QGIS?

I have a polyline drawing from AutoCAD that I would like to reposition manually, if possible. During my efforts so far it has been turned into both a tab file and shape file. The main source of ...
2
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2answers
52 views

Clipping a shapefile in QGIS that has user defined projections

I have two shapefiles for Rwanda which have user defined projections. I am trying to clip the geology shapefile so that it has the same spatial extent as the districts shapefile. When I clip, I do get ...
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1answer
39 views

How to make one checkbox that shows multiple layers in qgis or qgis2web?

I need to create one checkbox in qgis (and qgis2web) that than will show 2 other layers. So basically i don't want to check two checkboxes in the layerlist, but i want to simplify this proces by just ...
3
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0answers
42 views

Combine multiple adjoining parts of a single feature

In QGIS, one polygon feature resulted from merger of several adjacent polygons. This one new polygon feature has a single line through it that I would like to eliminate. When hovering over individual ...
2
votes
1answer
74 views

Colour coding vector layers?

Based on a previous post, I tried to implement this in the expressions tab: CASE WHEN "dBM" <= 0 THEN '255,0,0' WHEN "dBM" > 0 AND "dBM" <= 20 THEN '255,255,0' ELSE '0,255,0' ...
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0answers
10 views

QGIS DB Manager hanging on import

I have a data set which is an extract from OSM. I'm only using the roads shapefile and adding labels. The extract is the state of Pennsylvania. I then tried to import this layer to PostGIS from the DB ...
5
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2answers
87 views

How to differentiate between bare soil and urban areas in Landsat 4-5 land cover classification?

I am trying to classify a Landsat 4-5 image using the semi automatic classification plugin (QGIS). I always get misclassifications between bare soil and urban areas as they have similar spectral ...
2
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1answer
29 views

Mapping out 3D points with QGIS2threejs

I have some points I would like to map out in 3D. The points were gotten from a GPS module athat was attached to a Raspberry Pi. This is the settings I used before starting qgis2threejs: This was ...
1
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1answer
32 views

Changing CRS in QGIS due to pop up window: "CRS warning! Warning: Input layers have non-matching CRS. This may cause unexpected results.” [duplicate]

I'm using GIS to map the movement of animals and their speed and density in different habitat types using shape polygons. When I got to the step ;Count points in polygon' a pop up window appeared ...
3
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1answer
43 views

Find out if overlaying polyline matches polygon centerline in qgis

I have a polygon and a polyline and I need to find a scientific way of how close that polyline is to the actual polygon centerline. Is there any way of doing this in qgis? Any extensions, models, ...
1
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0answers
39 views

QGIS LYON desktop cannot be opened on windows 7

I have installed QGIS lyon from http://qgis.org/downloads/QGIS-OSGeo4W-2.12.3-1-Setup-x86_64.exe on win7. I did not install the default data set. On my desktop, there are some icons of QGIS. ...
2
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1answer
38 views

Extracting NDVI using QGIS from multiple images to Excel?

I created 25 images in QGIS. Each image has different information about the NDVI of the area. How can I extract mean, max, and min information about the NDVI from each image and put it in Excel?
1
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2answers
38 views

How to eliminate points by difference (vector geo processing tool)?

I have a point that falls outside the bounds of my area of study. What I did was select it and resorted to vector commands - GIS - difference. Unfortunately I can not get the desired result. My ...
3
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2answers
75 views

Changing pixel size in 'asc' file using Qgis?

I have soil data and BioClim data from Australia soil data: rows 2200 columns 1400 pixel size 0.0025, -0.0025 255 BioClim data: rows 660 columsn 420 pixel size 0.00833333, -0.00833333 I am ...
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2answers
39 views

How to combine two polyline shapefile together

Here is my question Two shapefile: * A: represent the outer boundary of the city area * B: represent the inner boundaries of the city divisions. I want to * Combine these two shapefile * ...
4
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0answers
44 views

OS terrain 50: .vrt from zip files

I tried to follow what was suggested in How to use OS Terrain 50 in QGIS, but I got the following problem: in spite of being generally able to generate .vrt files using gdalbuildvrt from unzipped ...
1
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2answers
53 views

Calculate Z Median from 3d line?

How does one calculate the median value of Z from a 3D line? The Add Surface Information tool in 3D Analyst only does Min,Max and Mean (average), and requires a surface model. (In this case I have ...
2
votes
1answer
40 views

Automated clearing /tmp using QGIS batch processing?

I'm currently batch processing a bunch (~200 x 200MB) of ascii grid surfaces using some SAGA and GDAL algorithms in QGIS and have been running into "out of storage" errors. The issue is that between ...
3
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1answer
63 views

Counting polygons in one layer that are overlapping/touching/contained in each polygon in separate layer of contiguous polygons using QGIS?

I have a layer of contiguous (pink) polygons (UK Parliamentary constitutencies) and a separate layer containing (blue) polygons representing protected nature areas (Natura 2000 areas): Each ...
3
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1answer
27 views

Disable QGis Tips Panel when application start

I am trying to disable the QGIS Tips Panel with config files. I use QGIS Lyon. - QGIS2.ini - And a custom file define with the parameter --customizationfile I know the user can click on "I've had ...
2
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0answers
12 views

Qgis PCA plugin not responding

I am trying to do principle component analysis, my file size is 1,5GB. It has been not responding past 30 mins, but I decided not to close the program, is it running or I am just waiting for nothing? ...
2
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1answer
39 views

Rename cells in Attribute Table to 'XXX.$ID'

I feel like this should be easy to answer, but I can't get it to work for me. I need to edit the attribute table of a .gpx file before I load it into my GPS, in order to label the points. I can rename ...
3
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3answers
26 views

Connecting points - plugin problem QGIS

I have a question related to connecting points in QGIS. I am doing a project relating to transport. I have a layer of points (bus stops) and I have to connect them according to a timetable (as runs a ...