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Questions tagged [qgis]

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

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6
votes
2answers
12k views

Nearest distance between point layer and line layer, QGIS

I have two layers , line and point layer. I need to make a line layer which connects all points to nearest line features? Did someone make a plugin for qgis? This is very important tool which missing ...
3
votes
1answer
6k views

Finding nearest line to point in QGIS? [duplicate]

Given a point and few lines, how should I go about finding the nearest line to the point? I am aware of Finding nearest line to point using ArcGIS Desktop (ArcObjects/ArcPy)?, but that is in ArcGIS ...
18
votes
7answers
19k views

How to change the order of features in a shapefile?

I have a shapefile and I want to change the order of the features. Is that possible? I want to sort the features in the shapefile because I'm embedding this shapefile in a mobile app. The app will ...
13
votes
2answers
4k views

Ortho Projection produces artifacts

I`m trying to create a sphere-like view using qgis and the "world from space"-projection http://spatialreference.org/ref/sr-org/6980/ (essentialy an ortho-projection). ArcGIS wraps the shapes ...
8
votes
3answers
20k views

Adding ArcGIS Online Services to QGIS?

Looking for info on how to add web mapping services from the Ohio Department of Natural Resources website to QGIS. I've tried nearly a dozen different things online and still can't get results. Don'...
23
votes
5answers
55k views

Importing coordinate data from excel into QGIS?

I have an excel file containing data collected over many years as latitude and longitude coordinates for archaeological sites - how can I import it into QGIS as a new layer?
13
votes
2answers
3k views

How to call the interpolation plugin from the python console?

I would like to call the QGIS interpolation plugin function (TIN method) (Raster->Interpolate) from python console. I can't find the corresponding function within QGIS API or within the ...
7
votes
3answers
16k views

Creating points based on distance and bearing from survey point using QGIS?

I am plotting witness tree data to calculate pre-settlement tree density. I have a shapefile with points along section lines (square miles) at each half mile. I am making another table that contains ...
12
votes
2answers
2k views

Where did the polygons go after projecting a map in QGIS?

I'm fairly new at GIS know-how, but I've run into a problem with a projection of a world map. I have a shapefile of all countries I downloaded from Natural Earth. After projecting it into a ...
9
votes
6answers
5k views

QGIS won't read table columns in CSV import on Mac OS

I am trying to import a CSV file into QGIS, but it ends up looking like my print screen below (program is in Swedish but in the preview window you can see how QGIS won't read my data correctly). I can'...
8
votes
1answer
10k views

Why are the Google basemaps no longer appearing in QGIS?

I had done a few projects using Google Physical/Streets as basemaps but now when I re-open those projects all layers appear except for the google basemap (other layers include .kml). I had ...
7
votes
3answers
2k views

great circles in QGIS and export in 3857 webmap

My plan is to visualize great circles in a leaflet webmap. So coming from this great postgis article and R version I thought it would work like this in QGIS: create line from two points, store ...
13
votes
3answers
40k views

Create a new layer from overlap between two layers?

I'm new to desktop GIS, and will try to ask while lacking the proper terms from the GIS lingo: If QGIS was like Photoshop I would like to make a selection from one layer, and then match that ...
5
votes
1answer
1k views

Rotating symbols per attribute value in QGIS?

I am trying to apply a rule to rotate symbols based on the value of an attribute. I tried to copy Automatically changing the angle of a symbol in QGIS?, which is essentially my question, however it ...
3
votes
3answers
2k views

Couldn't load SIP Module

After reinstalling QGIS, the desktop program runs but generates the python error "Couldn't load SIP Module Pythin support will be disabled" Because of this error, no plug-ins will load. I found a ...
3
votes
3answers
4k views

Data-defined Styles in QGIS

I have downloaded a shapefile of bedrock geology. I need it to be displayed as it should be with the style applied. The supplier will no give me a qml. but i have noticed in the .dbf file the Cyan ...
7
votes
4answers
14k views

Cannot see OpenLayers under Plugin in QGIS?

Although I have installed the OpenLayers plugin in QGIS 2.4, I cannot see it in the list when I click on Plugins. Does anyone else have this issue?
5
votes
1answer
451 views

Turning vector grid into individual shapefiles using QGIS?

I am using QGIS and I created a vector grid on a crop field in order to cut it into plots. I want to save each grid cell into individual polygon shapefiles automatically. Here is an example of a ...
18
votes
3answers
14k views

How to calculate Network Service Areas in QGIS?

Is there any way in QGIS to apply service area buffers e.g if I have a point on a map I wish to show the service coverage of 1 mile, 2 mile, 3 mile, breaks using the road network?
16
votes
7answers
36k views

Viewing LIDAR data (.las) in QGIS?

Is there an easy path to visualizing LIDAR data in QGIS? I have some USGS LIDAR data in .las format downloaded from http://lidar.cr.usgs.gov/. This means I have both the .las and metadata in .xml ...
35
votes
4answers
21k views

Is there an automatic function in QGIS to package all files in a project for transferability?

In my project, I use a lot of geodata from different directories. Now I want to give the QGIS project to a colleague (eg on a CD). Is it possible to copy the shapes from different directories ...
23
votes
2answers
71k views

Cropping Shapefiles in QGIS?

I need to clip a large and very detailed shapefile in QGIS showing environmental data similar to a temperature map. Is there something like the very simple crop tool like in Adobe Photoshop where ...
19
votes
2answers
19k views

How to create a new empty vector layer programmatically?

I am new to python and QGIS. I have looked at a few tutorials of python scripts for QGIS. All of them create new vector and raster layers with some existing data source. eg. shapefile or geotiff or ...
19
votes
2answers
32k views

Controlling Image Output Settings in QGIS?

I am exporting a QGIS map to an image format. I would like to have control over the output settings of the image (dpi), as currently it is only exporting the images at 96 dpi. Does anyone know if ...
8
votes
3answers
8k views

Exporting several files at same time in QGIS?

I have a lot of .TAB files open in QGIS and I want to save them to .SHP so I can work with them in ArcMap. Is there a way to save/export all these files at the same time or do I really have to "save ...
23
votes
2answers
16k views

Seeking qml or sld file for QGIS + OpenStreetMap data? [closed]

I'm looking for a qml file (or equivalent e.g. sld) to allow me to use QGIS to take OpenStreetMap data and produce paper maps. I'm re-asking this question (it was asked once or twice over a couple of ...
15
votes
4answers
5k views

Elevation profile 10 km each side of a line

How can I get an elevation profile for a band of terrain? The highest elevation within 10 km (on each side of the defined line) should be taken into account. I hope my question is clear. Thank you ...
13
votes
4answers
17k views

Digitizing raster automatically? [closed]

I have a raster (.sid extension) file. I want to digitize roads automatically in ArcMap, QGIS, etc. Digitizing by hand would be too time consuming. How can I do this ?
11
votes
2answers
49k views

Changing unit of measure from degrees to meters in QGIS?

I am running QGIS 1.7.0 on windows, and I donwloaded a shapefile of census block group boundaries from TIGER. This file appears to be in the WGS 84 coordinate system, and when I open it in QGIS the ...
8
votes
1answer
3k views

Manipulating Azimuthal Equidistant Projections in QGIS

I have a shapefile of world countries that is projected as Azimuthal Equidistant with Chicago, USA as the center. I would like to change the projection such that Edinburgh, UK is the center. One would ...
7
votes
1answer
16k views

Clip raster layer with *raster* mask layer in QGIS

Given two input layers 1. The clip layer - an arbitrary layer (though in my case it's a float 1 band geotiff) 2. The mask layer - a paletted raster in which every pixel is either NO DATA or a single "...
5
votes
2answers
8k views

Colouring areas between (vector) contours?

Is it possible to colour areas between (vector) contours without making it a DEM first? Joshdoe seems to have done so in Create filled contour map with GRASS but does not say how.
16
votes
2answers
15k views

How to create multiline labels in QGIS?

How can I apply Multiline label option in the label property.Name field contains a lengthy name. I want to wrap it. How can I do it? please help me. My QGIS version is 1.8
14
votes
1answer
10k views

How to extract pixel value counts from a raster in QGIS?

How does one go about obtaining a summary of the counts of cell values within a raster in QGIS? I know QGIS is doing this, in order to provide the summary statistics and histogram in the properties of ...
10
votes
1answer
5k views

Using in-memory vector layer with QGIS processing / SEXTANTE

I'm trying to run the qgis:clip algorithm from console, but am getting an error when using an in-memory layer as the overlay parameter. Is this to be expected, or am I doing something wrong? Code: ...
9
votes
4answers
28k views

Calculating minimum distance between points and polygons in QGIS?

I have two vector layers: one point and one polygon and I want to calculate the minimum distance of each point from the polygons (ie the distance from the closest point of the closest polygon). Is ...
7
votes
3answers
8k views

How to read Greek fonts (ISO-8859-7) in shapefile attributes within QGIS 1.8.0?

I'd like to ask whether there is a way to read greek fonts in a shapefile's attribute table within QGIS 1.8.0.
6
votes
4answers
10k views

Creating DEM from LAS file without using LAStools?

I want to create a ground model from a *.las file. The LAStools are available in QGIS but limited in use (generation of black diagonal in result file), so I can't use this. In the GRASS tools I can ...
15
votes
10answers
18k views

Broken packages and unmet dependency installation QGIS, PostgreSQL and postgis Ubuntu 14.04

I am aware that this could be a duplicate topic but I am struggling for a several days. I upgraded QGIS from 2.8 to 2.18 and after that everything get broken. I couldn't use PostGIS extension on ...
12
votes
1answer
5k views

Sort layers in QGIS table of contents?

When I load a bunch of layers into QGIS from PostGIS, they seem to load in reverse alphabetical order. Is there any tools or plugins that allow you to quickly sort the QGIS TOC in a different order? ...
12
votes
7answers
6k views

Map display not filling window in QGIS on Mac?

In this screenshot of QGIS, you can see that the map is not filling the window. I have tried resizing the window in various ways. Am I missing something obvious, or is this a bug? Versions: ...
10
votes
6answers
8k views

Working with File Geodatabase in QGIS for MAC OSX?

I understand there are programs like OSGeo4W that allow windows users to work with Esri File Geodatabases, but is there something similar for Mac OSX 10.6?
9
votes
2answers
7k views

QGIS 2.4 access .mdb add error

So I followed the instruction here: Can QGIS read an ODBC connection? for adding a .mdb into QGIS. There are great instructions about 1/3 of the way down. But I still can't get it to open. I on ...
6
votes
1answer
789 views

Slope analysis from NED data gives crazy histogram? [duplicate]

I'm attempting a simple slope analysis in QGIS2 using the plugin at Raster -> Terrain Analysis -> Slope. The slope output layer has a very strange histogram, basically spikes at 0 and at 89.9098 with ...
19
votes
6answers
26k views

How to access QGIS Plugin Repositories from behind a proxy?

I have been trying to teach myself QGIS by using this forum and others to help. Most of my questions can be answered by downloading plugins that are available through 3rd party repositories but for ...
7
votes
1answer
9k views

Grouping points in QGIS?

I need to group 400 points in 10 groups with 40 points each. The goal is to get the 40 points geographicly together like this: Any idea how to do this with QGIS?
8
votes
6answers
4k views

How to Digitize Free Satellite Imagery in QGIS - Alignment issues with Openlayers Plugin

I am trying to digitize OpenLayers data (such as Google satellite imagery) with no success. Whenever I try to move or zoom the canvas the vector layer I digitized loses the position relative to the ...
6
votes
2answers
7k views

How to add links to PDFs in a Shapefile?

I want an attribute in a shapefile named "Link" to add. The works are all fine but then I would like to add a link in my directory. This link accesses a PDF. Now, this PDF is not shown. Is there ...
3
votes
2answers
6k views

Unable to run any GRASS 7 algorithms in QGIS 2.18.10 on Windows 7(64)

Running Windows 7 Professional (64bit) SP1. I have QGIS 2.18.10 installed from the standalone installer. The GRASS commands (161 algorithms) are present in the toolbox and seem to run ok. However the ...
8
votes
7answers
22k views

Redefining nodata value into zero in QGIS?

I have an image which i cliped with an AOI polygon. The contour area was set to pixel value = 0 and I have a nodata value of -32768. I want to redefine the nodata value into zero. I used to do this ...