Questions tagged [polyline-creation]
Used for questions about making polyline features
327
questions
2
votes
1
answer
99
views
Creating tangential lines at points along shoreline in QGIS
I want to create tangential lines for each point along a shoreline in QGIS, such as the dashed line I've hand-drawn.
These points are not randomly spaced, they each represent the angle at which each ...
- 21
1
vote
1
answer
38
views
Geometry still set as point when creating lines in QGIS Geometry Generator
I'm using QGIS to analyze coastal erosion and have come across an issue with geometry type. I have a vector layer of about 150 control points along the shoreline and used a geometry generator to ...
- 11
0
votes
0
answers
39
views
Calculating Length of Polylines in Miles Based on Individual Point Features
I am using ArcMap 10.8.
I may be trying to do too much in one query, but I'm hoping there is a way to do what I'm trying to do without repeating the process 1,657 times.
I am trying to analyze the ...
2
votes
2
answers
117
views
Converting polygons to lines that are split depending on borders being shared in QGIS
I have a file containing polygons that delineate the boundaries of municipalities within a specific region. I want to convert the polygon boundaries to lines. The resulting lines should be split ...
- 51
1
vote
1
answer
173
views
Creating radial lines from center of polygon to edge in QGIS
I have a set of polygons for which I need 16 radial lines each from the centroid of the polygon to the edge (see image). So far I have only found a python script to create radial points for a circle (...
- 91
3
votes
2
answers
134
views
Drawing routes (on road shapefile) between X,Y coordinates in QGIS
I've got a column with 300 of start points and 300 of end points (X,Y coordinates for each point).
I now want each row in the column to connect with each other (e.g. X,Y Coordinate for Start Point, ...
- 31
3
votes
1
answer
501
views
How to get the centerline of a polygon without artefacts in Python?
I am using Python to obtain the central line of a polygon (blue line) which represents the contour of a road (red line). To do so, I have used the Centerline library as shown below:
from centerline....
2
votes
0
answers
54
views
Building route on defined graph of roads with intermediate stops in QGIS
I have a layer with stops of public ground transportation routes. I also have a layer with a graph of roads where public transportation can go. I need to build a route from the first to the last ...
3
votes
3
answers
748
views
Building the shortest path between two points inside polygon using QGIS
With QGIS I need to build the shortest route between two points inside a polygon. I have a vector polygon layer and I need to build a path inside it from the starting point to the ending point. How ...
- 347
6
votes
1
answer
191
views
Drawing an arc with length proportional to a distance in QGIS
From two points layers:
'ORIGIN' → Origin point at coordinate 0,0
'CLUSTERS' → Points identified by cluster with field "CLUSTER_ID"
I am drawing a line from each point in the 'CLUSTERS' ...
- 2,419
3
votes
2
answers
230
views
Recreating the shape of curved arrows with QGIS Geometry Generator
In QGIS, I have a line layer with straight lines, consisting only of two vertices: start- end endpoint. I can now use Geometry Generator (see below for the expression I use) to create a third point in ...
- 73.1k
8
votes
1
answer
267
views
Connecting dynamically the 8 nearest lines to @map_extent_center in QGIS
Starting from a points geometry layer, I am working on the following function that has the goal of drawing 8 nearest lines to the @map_extent_center of the map view:
make_line(
$geometry,
@...
- 2,419
6
votes
1
answer
119
views
Drawing 10 nearest lines from each point connecting to the centroid of the 5 points nearest to each point with QGIS expression
Starting from a layer with point geometry, my goal is to do two calculations in one Geometry Generator expression.
First, for each point, I would like to calculate the centroid for the 5 points ...
- 2,419
5
votes
1
answer
144
views
Joining point data in chronological order using timestamp in QGIS
I have a data set which gives me the location of livestock every 30 minutes over months. I want to join these points to show the path travelled by individual animals. I have a unique ID for each ...
0
votes
0
answers
82
views
Merge multiple tracklogs or route points to one polyline
I'm having a similar case like the one posted Tracklogs to single line OR several lines to one line?.
However what differs in my question here is that I want to display the merged or common shared ...
