All Questions
30 questions
41
votes
4
answers
66k
views
Loading OpenStreetMap data in QGIS?
In QGIS 1.8 I used the openstreetmap plugin to request data from the server, or open a .osm XML file, which produced 3 layers (polygons, polylines and points) in QGIS.
This was great (give or take ...
- 533
8
votes
1
answer
26k
views
Shapefile/vector layer not appearing in QGIS
I have a shapefile (calling it 'new.shp' for discussion's sake) that won't show up with other layers.
If a fresh file is started and I bring in 'new.shp', it will appear, but any other layers imported ...
- 83
5
votes
1
answer
5k
views
Save map in raster format from QGIS using compression
Is there a method to save a map in raster format from QGIS using compression?
For exemple from "Export map" in ArcGIS there are many options to compress the images depending on the file type (tiff, ...
- 499
5
votes
0
answers
201
views
QGIS 2.18.14 vector Clip analysis producing erroneous result
I am trying to perform a vector clip analysis (vector-->geoprocessing tools pull-down menu) using two complicated vector layers and am getting erroneous results. The clip 'Input layer' is shown here:
...
- 51
4
votes
2
answers
1k
views
Is there a vector affine transformation tool in QGIS2?
In QGIS 1.8, I can transform my point layer with the plugin "Affine transformation". So, this plugin don't exist in QGIS 2.0.
Do you know a method to simply translate (i.e : X -> X+30000) in QGIS 2 ? ...
- 558
4
votes
1
answer
85
views
Combining Layers not outputting correctly in QGIS?
I have two shapefiles I'm trying merge together. I want to use this shapefile in another application I use. When I import them in QGIS, they look exactly how I want them to be positioned (relative to ...
- 61
4
votes
1
answer
437
views
Memory Vector Layer Corrupted?
I was working with a large data set that had data for roads, rivers, railways, etc. all together so I decided to break the different data out so I could label it differently on the map and check each ...
- 399
4
votes
1
answer
1k
views
Joining csv file to vector layer in Processing modeler?
I am trying to join a simple CSV file of values to a vector layer within Processing modeller.
The match would be on an ID held by both files. The CSV file has no geometry.
I can do this easily in ...
- 295
3
votes
1
answer
10k
views
How to edit a vector layer extent?
I'm working on QGIS 2.2, and I would like to make a vector layer extent bigger (thus the clip option is not suitable) to match exactly my mask layer extent. I would like the new added area to be empty....
- 31
3
votes
3
answers
2k
views
Invalid geometry message when using Difference tool
I am using the Vector \ Geoprocessing \ Difference tool to get the resulting area when taking a) current ground disturbance away from b) historic total ground disturbance to give c) what has been ...
- 633
3
votes
2
answers
820
views
QGIS: Class boundaries
I have seen that people already had issues about overlapping class boundaries with the classification of graduated vector data.
I am wondering if there is somewhere written in the documentation if ...
- 63
3
votes
2
answers
2k
views
Error when Add GeoJSON protocol layer in QGIS
I tried to add these GeoJSON files to QGIS (2.18.9 & 2.14.15) with Add a vector layer by Protocol, GeoJSON with GUI OR Python Console:
https://raw.github.com/geobabbler/geodata/master/geojson/...
- 1,096
2
votes
3
answers
5k
views
Qgis is not exporting vector PDF at larger scales
Context
We're now in the process of transferring our systems to Qgis.
what needs to be done
I need to export a DXF based map from Qgis into vector pdfs, in order to import into the program we use ...
- 487
2
votes
1
answer
921
views
Adding new columns from other shapefiles - Land use density
New here but I've been following the stack exchange for a while to get many answers on my newbie journey in GIS. I'm trying to find out how to merge different point in polygon classes by column.
...
- 23
2
votes
1
answer
401
views
QGIS. get intersect line segments from polygons
I have 2 types of Polygons. one big Polygon (P1) and multiple smaller polygons (P2) all located inside P1.
Is there a way to get the line segments that intersect/touch?.
Running "Geoprocessing ...
2
votes
2
answers
203
views
Deleting vector lines beyond image extents using QGIS?
I am using QGIS 2.2
I have one vector line layer (roads) that stretches beyond my base image (see below).
I wish to have the roads "clipped/trimmed or deleted" right at the edge of the image's ...
- 61
2
votes
1
answer
409
views
QGIS 2.12.3 Crashes on buffering line vectors
I'm using QGIS 2.12.3 and I'm trying to create a buffer of 100 mt around a line vector using the Vector - Geoprocessing Buffer tool, but qgis crashes at every try. I've already checked that the RS of ...
- 243
2
votes
0
answers
27
views
QGIS upgrade from 1.8 to 2.12: Vector layers are not displayed
I just updated my very outdated version of QGIS. I was running 1.8 and thought the new version would work out a couple kinks that had developed. Well, now I can't even figure out how to make my vector ...
- 21
1
vote
2
answers
1k
views
Multiparts to singleparts to error - QGIS
I work with this polygon and I try to use the vector tool "Singleparts to Multipart" in order to expload the layer to multipart, so I can select each part seperatly.
I don't care if the features in ...
- 4,082
1
vote
1
answer
1k
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 ...
- 19
1
vote
1
answer
388
views
Plugin SWAP vector direction doesn't work in QGIS
I've installed plugin Swap vector direction in QGIS.
But it doesn't work. I click and nothing.
I need to flip lines (22 000 000 lines).
In ArcGIS takes many hours and still flipping.
I thought ...
- 11
1
vote
1
answer
934
views
Projecting vector data in QGIS?
I'm running QGIS 2.2 on Ubuntu 14.04. Trying to project data gives me a hard time right now.
The last time I did that was in 2.0 and I basically changed the projection by saving the data as a new ...
- 291
1
vote
0
answers
617
views
Getting vector layers to appear in map rendering?
I am using QGIS 2.18.7 on Windows 7. I am attempting to write a pyqgis script that will create a map rendering and save it, using a raster layer, a polygon layer, a line layer and a point layer. The ...
- 253
1
vote
0
answers
126
views
Data dependent override on colour and linewidth of line pattern fill not working after upgrade to QGIS 2.12
I have recently upgraded to QGIS 2.12 which has resulted in a problem with one of my projects, whereby the data dependent override of the line width and colour of a line pattern fill and SVG marker ...
1
vote
0
answers
355
views
How to set pen width of rivers based on scalerank attribute (QGis 2.2)?
I have a Vectorlayer from NaturalEarth.com with riverdata that includes "scalerank" information. Now I want to display these with different pen width based on their scalerank, like this:
scalerank 1 ...
- 389
1
vote
2
answers
895
views
QGIS 2.0 Automatic generation of a vector layer out of a point layer
I am an environmental engineer and the aim of my QGIS 2.0 project is to visualize the results of a sewage water system inspection. In a first step I included the hoppers from a csv file and added a ...
- 25
0
votes
1
answer
460
views
Using Rasterize Tool (vector to raster) of QGIS
I am using QGIS 2.18.28.
I am trying to convert a vector file into a raster using the rasterize tool however it us just producing a back block of a single value. I am rather confused as I have used ...
- 25
0
votes
1
answer
127
views
Understanding polygonize tool- QGIS 2.14
I tried to convert all the roads (red) from this raster into vector:
but when i use the convert tool- Polygonize, i get this result:
whereas, i expect to get all the roads with single clear DN/ RGB....
- 4,082
-2
votes
1
answer
12k
views
Easy way to create buffer in QGIS 2?
In the old version of QGIS creating buffer was a relatively complicated task.
Basically you had to save your layer as a new one with metric cylinder CRS in order to calculate distance correctly.
If ...
- 2,867