Questions tagged [qgis]

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

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196 votes
6 answers
485k views

Adding Basemaps from Google or Bing in QGIS

ArcGIS Desktop has the option of using basemaps from ArcGIS Online. Does QGIS have any such options?
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  • 3,191
180 votes
7 answers
210k views

Installing File Geodatabase (*.gdb) support in QGIS

I have spent around 2 days to find the way to open GDB (ESRI Geodatabase) in QGIS (or any other open source software) but still without success. I have downloaded the newest OSGeo4W installer and ...
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  • 9,196
108 votes
8 answers
261k views

Calculating polygon areas in shapefile using QGIS

How do I calculate areas of an area shapefile in square meters (m²) or in acres (ha)? I didn't find that functionality in the Vector Tools.
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  • 2,161
106 votes
5 answers
245k views

Merging multiple vector layers to one layer using QGIS

I've imported several shapefiles which where exported from a Mapinfo .tab. Several .tab-files are imported resulting in 20+ layers. Afterwards I want to export it to GeoJSON; but I'm reluctant to ...
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  • 2,109
89 votes
4 answers
109k views

Renaming attributes/fields in shapefile attribute table using QGIS

I would like to rename some fields in my attribute table: Like rename "XRF_N3"in something else. It seems quite a easy issue but I don't find any information about how can I do that.
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  • 1,938
81 votes
5 answers
50k views

Visualising WKT geometry string in QGIS

Is there a simple tool in QGIS to graphically visualise geometry formatted as text? Example geometry: POLYGON((571178 6337246,571178 6402217,598061 6402217,598061 6337246,571178 6337246)) Result: A ...
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  • 4,292
77 votes
12 answers
188k views

Creating point features with exact coordinates in QGIS

How do I create point features with exact (manually entered) coordinates in QGIS? I get precise GPS coordinates from a survey team which I need to add to a point layer. What I want: add point, type in ...
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68 votes
7 answers
42k views

Generating Map Tiles with QGIS

Is it possible to generate map tiles from QGIS? I guess QGIS Server must have a way to do it, but is there a way to just generate the tiles and save them to disk? With the new symbology renderer and ...
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  • 2,857
67 votes
5 answers
114k views

Clipping raster with vector boundaries using QGIS

In QGIS I would like to clip a raster precipitation layer using an admin boundary layer that is vector data. However the Geoprocessing tools seem to be usable only for vector data. How can I clip this ...
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  • 671
65 votes
5 answers
46k views

Building effective heat-maps?

Using ArcGIS, QGIS, Grass, and/or GVSIG: What are some of the tools and processes involved in building effective heat maps? What are the plugins involved? What are the major data requirements? What ...
65 votes
3 answers
96k views

Installing latest QGIS version on Ubuntu? [closed]

I am relatively new to Linux, so can you indicate the exact commands (step-by-step) that I need to type to get the latest QGIS installed on Ubuntu 14.04. I have tried to follow the instructions ...
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  • 759
60 votes
3 answers
69k views

Uninstalling QGIS that was installed using OSGeo

I installed QGIS using OSGEO4W, and would love to know how to uninstall it, because when I go to "Control Panel > Programs > Uninstall" the program does not appear in the list of installed programs. ...
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  • 601
57 votes
8 answers
201k views

Importing DWG into QGIS project?

I have a lot of DWG files like basemap, and water and wastewater network. How do I import these files into my QGIS project?
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  • 629
57 votes
11 answers
63k views

Removing small spaces (slivers) between polygons?

I have a set of polygons representing administrative districts. The districts were digitized by hand, and there are small spaces (slivers) between polygons where the polygons should be touching. How ...
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  • 681
56 votes
2 answers
116k views

Selecting features within polygon from another layer using QGIS

I'm using QGIS 1.8 with a PostGIS database and I have three PostGIS layers in QGISL: a lines, a points, and a polygon. I'm trying to select features in the polygon layer and mark all points within ...
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  • 561
54 votes
9 answers
74k views

Missing Processing Tools in Vector Menu of QGIS

I'm missing all the usual processing tools in the Vector menu in QGIS 2.16 (e.g. Vector Overlay, Analysis, etc). They do appear in the processing toolbox but there's no sign of them in the Vector menu....
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  • 876
54 votes
7 answers
135k views

Getting list of coordinates for points in layer using QGIS?

I've got a layer in QGIS that is comprised of points. Its attribute table doesn't have (show) the corresponding x and y coordinates for each point. Is there a way for me to extract a list of ...
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  • 2,977
54 votes
4 answers
39k views

Making spatial view in PostGIS and adding it as layer in QGIS?

In PostGIS 2.0, I am seeking an efficient way to create a spatially enabled view that is viewable in QGIS. I followed the context of Part 2 of @Mike Toews answer to How to create a table from ...
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  • 22.4k
53 votes
8 answers
17k views

Switching line direction in QGIS

I would like to be able to swap the direction of a polyline/line in QGIS. I made a custom tool to do this in MapInfo, however I can't seem to find anything for QGIS. Does anyone know of a tool to do ...
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  • 33.8k
53 votes
13 answers
19k views

Seeking QGIS user interface tutorials and web resources

I wish to familiarize myself with the capabilities of QGIS up to and beyond QGIS version 3.0. Can you recommend some good web resources and tutorials that would show me QGIS' capabilities? I am ...
52 votes
3 answers
53k views

Choosing between QGIS and GRASS for simple thematic maps with different layers

I was working with GIS and remote sensing in a university and professional environment some ten years ago (ArcInfo etc), so I have some experience even though somewhat outdated. Now I am looking for ...
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  • 553
51 votes
3 answers
65k views

Reprojecting vector layer in QGIS

I have a series of layers of lines (shapefiles) in My Project. The CRS of some are different and to merge them they all must have same CRS. When I use Processing > Toolbox > Qgis_algorithims >...
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  • 511
50 votes
5 answers
42k 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 ...
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49 votes
7 answers
46k views

OpenLayers low resolution and/or shifts in QGIS print composer?

I'm having trouble with the OpenLayers Plugin of Qgis and the map composer: If I create an OSM-background layer and if I want to export this, the OSM-Layer looks perfectly all right in the normal ...
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  • 2,161
48 votes
8 answers
51k views

Using continuous color band for raster legend in QGIS composer legend?

I'm looking for a way to insert continuous colour legend for a raster layer. I managed to create discrete symbols with values along the bar, but I would like to have a continuous bar with some values ...
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  • 771
48 votes
5 answers
22k views

Smoothing DEM using GRASS?

I have a SRTM DEM and I want to create a shaded relief from it. I created the shaded relief in GRASS and the result is very nice, but a little rough because the area is near flat and the DEM is 90m in ...
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  • 9,723
48 votes
8 answers
26k views

Comparing QGIS and gvSIG? [closed]

Many debutant GIS users are asking me which one is better QGIS or gvSIG. Since I use Qgis and I don't have any experience in gvSIG, I aways say that both are very nice softwares and the chose is a ...
47 votes
2 answers
61k views

Understanding difference between Polygon and Multipolygon for shapefiles in QGIS?

Creating Scratch layer gives me a choice between Polygon and Multipolygon, so I started wondering how should I make use of them. Reading a new book "Mastering QGIS" (through this answer by Joseph to ...
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  • 29k
47 votes
5 answers
76k views

Smoothing/generalizing polygon in QGIS

Is it possible to smooth or generalize a polygon in QGIS, perhaps by using a plugin like the Generalizer Plugin for lines? I could convert my polygons to lines, smooth them and convert them back to ...
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  • 7,663
47 votes
4 answers
78k views

Converting ArcGIS (*.mxd) file to QGIS (*.qgs) file

I recently tried to use QGIS and I wondered if you can convert a draft ArcGIS map (*.mxd file) into a QGIS project (*.qgs file). Are there any solutions available? This would avoid thematize the ...
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  • 471
46 votes
5 answers
27k views

Change style properties of several layers simultaneously?

I'm working on bulk data. I have a few hundred GeoTIFF images imported into a QGIS project, and I'd like to modify their layer properties - things like the no-data-value, transparency of certain pixel ...
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46 votes
7 answers
30k views

How to create svg symbols that have modifiable fill color, stroke color and stroke width?

I want to create some svg symbols for Qgis using Inkscape, those symbols must have attributes as described in the question. For the last two days, I have been experimenting as instructed by Sourcepole ...
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  • 1,846
46 votes
4 answers
52k views

Joining non-spatial CSV file to spatial data (shapefile) using QGIS

I have a CSV file which has postcode data in a field, but it is non-spatial e.g. no Easting and Northing. I have a shapefile with postcode in a field and some additional data. I want to join the ...
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  • 505
46 votes
1 answer
63k views

Installing QGIS plugin when offline

Due to various IT policies at my workplace, QGIS is installed on a machine that is not connected to the Internet. I wish to install a couple of QGIS plugins on this system. I have downloaded the ...
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46 votes
1 answer
16k views

Using GeoPackage instead of SpatiaLite, and vice-versa?

I am using now QGIS 2.18, which includes support for GeoPackage format. I know that GeoPackage is like a replacement for Shapefile but not quite so, as GeoPackage has database capabilities. At same ...
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45 votes
8 answers
62k views

How to create polygons with straight lines and right angles in QGIS?

When creating a polygon, how do I do it so that the lines are straight (90, 0 degrees, etc.) and when I create corners they can be right angles? For instance, how do I create a perfect square or ...
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  • 2,977
45 votes
4 answers
53k views

Where does QGIS write its error log messages?

I want to read and copypaste the error log for the crashes I am experiencing in QGIS 2.0. The error I am getting freezes QGIS so I have to ctrl-alt-del. I can see the last message in the panel, but ...
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  • 1,293
45 votes
3 answers
54k views

Manually placing labels in QGIS?

Is there a way to manually place labels in QGIS? I have a map which has almost-duplicate labels in some places (e.g. E 1st St and 1st St) and I'd like to remove some of them. Also, I'd like to ...
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  • 2,857
44 votes
8 answers
158k views

Exporting attribute table to Excel from QGIS

I have seen all the questions for how to export an attribute table to Excel from QGIS, and I try all the answers like copy paste, CSV (in fact this I do not know where to find), but none seems to be ...
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  • 801
44 votes
10 answers
38k views

Identifying duplicate attributes in field using QGIS

I have a point shapefile with thousands of points. It has an "ID" code field that is supposed to be unique. Every now and then the data entry clerk wrongly type the "ID" creating ...
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  • 443
44 votes
4 answers
46k views

Filling column with consecutive numbers in QGIS

I make a new column in my attribute table and it has a default value (for example 0). I want to (probably using the Field Calculator) have the result that row 1 has the value 1, row 2=2 and so on, ...
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  • 2,190
44 votes
5 answers
24k views

Calculating average width of polygon? [closed]

I'm interested in examining the average width of a polygon that represents the road surface. I also have the road centerline as a vector (which is sometimes not exactly in the center). In this example,...
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  • 15.9k
44 votes
2 answers
62k views

How do I check which version of GDAL I have and how many?

I have installed in my computer the following software: PosgresSQL 9.3.2.3 PostGIS 2.1.1.1 QGIS 2.0.1 Dufour (this one installed through the OSGeo4w package) QGIS 1.7.0 Wroclaw As far as I know all ...
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42 votes
3 answers
50k views

Ignoring invalid input features with Intersection tool in QGIS?

In QGIS 2.18, when I used the Vector > Geoprocessing Tools > Intersection tool, I was able to check an option which said "Ignore NULL geometries [optional]". Now I've downloaded QGIS 3.2 and that ...
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  • 1,717
42 votes
7 answers
118k views

Creating new layer from selection in QGIS

Is it possible to create layers from selection in QGIS? I am using QGIS 1.7.4-Wroclaw. To make it easier for others to see this, here are some pics. I used QGIS 2.0.1-Dufour. Selecting Saving Adding
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  • 869
42 votes
5 answers
78k views

Splitting shapefile into separate files for each feature using QGIS or SAGA [closed]

I have a polyline shapefile with about 20 kinds of roads. I would like to know how can I create automatically a vector file for each one. I am aware of how to do it using ArcGIS Desktop - see ...
user avatar
  • 429
41 votes
11 answers
55k views

Is there a way of auto_increment for the ID column in QGIS

I'm creating a fictive map and so I need to create lots of points, lines and for sure polygons. Later on I export my data as geojson. But before that I aways have to go and give every element an ...
user avatar
  • 857
41 votes
9 answers
40k views

GRASS not working with QGIS says This algorithm cannot be run

I updated QGIS to version 3.6 using OSGEO4w When I try to run any GRASS script, I get the following error message : This algorithm cannot be run :-( The specified GRASS 7 folder "C:\OSGEO4~1\...
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  • 1,821
41 votes
8 answers
86k views

How to determine the centroid of polygons?

I have a polygon vector and I want to quickly attain the centroid of this polygon for insertion in a text document. I am working with QGIS. I searched through other questions and although some are ...
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  • 701
41 votes
7 answers
7k views

Interrupting contour lines beneath elevation labels (instead of using label buffers) using QGIS?

Is there a way to interrupt a contour line beneath an elevation label using QGIS?
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