17
votes
Accepted
Place label along line near start and end of line in QGIS
2020 Oct update - label placement at start/end of lines or with a given offset is now be an inbuilt feature of QGIS 3.16 ! Link shows it in action.
QGIS 3.8 to 3.14
Consider using the geometry ...
- 13k
16
votes
Accepted
Splitting a Polyline at intersections
You need to use Split lines by lines tool, and use the same file as input layer and split layer, as you can see below:
You can find the tool from Processing toolbox -> QGIS Geoalgorithms -> ...
- 41.4k
12
votes
Accepted
Generating urban blocks by road centerlines using PyQGIS
General strategy for the solution:
Compute dissolved buffer area by road width. (Tool: Buffer)
Create bounding box of road layer. (Tool: Extract layer extent)
Remove the portion that overlaps the ...
- 78k
8
votes
How can I use roads from OSM data in R?
I downloaded a dataset from the City of Rome using the osmar package. After that, I followed your query to get the desired highways and then build a random SpatialPoints object inside Rome bounding ...
- 3,176
8
votes
Accepted
Divide a polygon into multiple small polygons using a MultiLineString
You may not need to use this MultiLineString variable for what you aim at. This works:
from shapely.geometry import Polygon, LineString
from shapely.ops import linemerge, unary_union, polygonize
poly ...
- 10.3k
8
votes
Accepted
Blending features in QGIS: Approximating road edges for map render
You need to use Symbol levels to have nicely rendered crossing lines. Using symbol levels you can sort the symbol levels and thereby control the order in which the different symbol layers are rendered....
- 41.4k
7
votes
Accepted
Merging close lines using v.clean
Buffering the road may be a solution to this problem.
create a dissolved buffer of the road using around 20 unit map distance.
import the layer into a postgis database and create the middle line ...
- 441
7
votes
Accepted
Switching road names from uppercase to mixed case in ArcMap?
In ArcGIS Field Calculator, you can use a simple Python expression with the string.capwords function to capitalize only the first letter of each word and change everything else to lowercase. Select ...
- 3,112
7
votes
Accepted
USGS topo symbols for light-duty and unimproved roads
This can be done in QGIS using two custom line styles (see the bottom of this answer for the two style files you can import into QGIS):
While it might seem like the "Light Duty Road" (two ...
- 6,934
6
votes
Accepted
Does OSM Road segments contain intersections - reg
In the OSM raw data, all ways (roads or else) are described as a sorted set of node numbers. Roads can be identified by a highway-tag, with some exceptions like highway=bus_stop, bridleway or footway.
...
- 77.1k
6
votes
Shortest path using line layer QGIS
"Shortest path (point to point)" can do what you need. First, all your lines have to be in the same layer. Merge them if needed.
Then, to avoid your error, your lines need to be connected ...
- 35.6k
6
votes
Accepted
Styling road intersections
Duplicate each layer (Right click on the layer name > duplicate layer). This does not create any additional data. It simply loads the same source data into the project again.
Change the style of the ...
- 25.1k
6
votes
Accepted
Finding Minimum Spanning Tree using QGIS
There is an already existing tool in processing plugin in GRASS -> Vector -> v.net.spanningtree
You will need to specify the vector line layer and the nodes ( optional )
and in advanced ...
- 3,275
6
votes
Accepted
Why osmId is not the same across the same road?
OpenStreetMap IDs are given for each segment of a OSM way (in this case the road). In OpenStreetMap roads need to be split in segments when attributes change, for example the maximum speed or the ...
- 5,237
6
votes
Accepted
Defining extent to limit labeled area in QGIS
You can use Rule-based labeling with this expression as the rule filter
within(
$geometry,
layer_property('raster', 'extent')
)
- 17.9k
6
votes
Defining extent to limit labeled area in QGIS
You can set the data defined "Show label" in the "Rendering" category with the expression intersects(layer_property('smaller_layer', 'extent'), $geometry) to do this.
Without ...
- 4,049
6
votes
Find highest (uphill) side of the road in QGIS
Single sided buffer both sides. I buffer with 40 m distance. To create two polygon layers, one for each side.
Field calculate the column side on both layer, value Left on the left buffer and Right on ...
- 77.7k
5
votes
Travel time calculator QGIS
For whoever also stumbles on this question. Now for more than 2 years since the inital question was raised and QGis 3.X has become more mature, one could achieve this by ORS tools or QNEAT3
ORS ...
- 73
5
votes
Measuring distance between points along line in QGIS
I first thought this question was basically same as another recent question Points layer distance from the start of line layer in QGIS.
However, there is an added complexity in this one, that OP ...
- 31.2k
5
votes
World's roads layer
OpenStreetMap data might be what you are looking for -- it is somewhat standardized and pretty up-to-date across many parts of the globe.
Check out their wiki for steps on download and converting ...
- 1,477
5
votes
Accepted
Road design using Least cost path by longitudinal slope in ArcGIS Desktop?
Connecting 2 points on contours by straight line is not going to work, as seen on your second picture line crosses same contour twice. I also very much doubt that any out of the box tools can help you....
- 23.3k
5
votes
Accepted
Get values of terrain elevation of roads in QGIS?
(I would suggest not to follow the approach in the linked blog post.)
You should be able to use more straightforward tool, Profiles from lines in QGIS Processing Toolbox | SAGA | Terrain Analysis - ...
- 31.2k
5
votes
Accepted
Extracting roads shapefiles from old TIGER/Line RT format?
QGIS
has a built-in driver for the TIGER data, as you've noted, through GDAL. This is exposed through the GUI in the Data Source Manager/Add Vector layer dialogs.
Similarly to how one would load ...
5
votes
Identifying road intersections in QGIS
Solution 1
Run Menu Processing / Toolbox / Line Intersections (see documentation) to get a new layer with points showing where lines cross (red dots in the screenshot). You can select twice the same ...
- 74.9k
4
votes
Accepted
Calculating density map of cycleways using fishnet in ArcGIS Desktop?
To do this I would:
Intersect your cycleways and the fishnet
Use Summary Statistics to SUM the lengths of the intersected cycleways by fishnet polygon ID
Use Join Field to join the summed lengths ...
- 65.4k
4
votes
Get values of terrain elevation of roads in QGIS?
The blog post example is completely wrong (see the comments box of the blog!).. With the recent QGIS version (3.4.) I can do it easily with the tool "Extract vertices", which gives you all line ...
- 1,866
4
votes
Accepted
Mapping out railways from paper?
You have to scan your paper map and then georeference your file, so that the image is aligned correctly in space in your coordinate system:
http://desktop.arcgis.com/en/arcmap/latest/manage-data/...
- 358
4
votes
Finding Minimum Spanning Tree using QGIS
You may also rely on the 'Minimum Spanning Tree' plugin of QGIS 3.x.
The paper Geo-MST: A geographical minimum spanning tree plugin for QGIS discusses the plugin thoroughly.
- 1,009
4
votes
Switching road names from uppercase to mixed case in ArcMap?
There are code samples for converting to Proper case in the ArcGIS help for field calculation. I can't tell if that is what you want but it is what I would expect in addresses. Proper case capitalizes ...
- 925
4
votes
Divide a polygon into multiple small polygons using a MultiLineString
I might misinterpret your question, but if you want to treat each line in the list of lines separately you can replace
merged = linemerge([poly.boundary, multi_line])
with
merged = linemerge([poly....
- 1,356
Only top scored, non community-wiki answers of a minimum length are eligible