Questions tagged [polyline-creation]
Used for questions about making polyline features
325
questions
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2
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Connecting points to line segments along path in QGIS
I have a set of points that fall along a trail, as in this image:
and I need to convert these points to line segments.
The points fall along a polyline, and points on the same line share a common ID &...
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vote
1
answer
129
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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 (...
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votes
1
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100
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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, ...
- 1,315
3
votes
1
answer
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Drawing polyline with user input points in QGIS using Python
I have an empty layer in QGIS in that i just want to draw a polyline by selecting points on layer using Python.
For example, if I select a start point and endpoint on a layer, I want to draw a line ...
CommunityBot
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4
votes
1
answer
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Split a polylines according to a specific point in R
I have 2 distinct spatial objects:
on one hand I have a SpatialLinesDataFrame
on the other hand I have a SpatialPointsDataFrame
Considering one line and one point that intersects that line, I ...
CommunityBot
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2
votes
1
answer
189
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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....
- 2,141
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168
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Automatic Vectorisation in ArcGIS
Is there any method or tool/model for ArcGIS to draw automatic line based upon raster data values.
E.g i have a DEM and i want to automatically generate a line feature passing through all those pixels ...
CommunityBot
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1
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259
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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,
@...
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votes
3
answers
476
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 ...
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2
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0
answers
51
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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 ...
- 32.9k
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4
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Creating perpendicular line transects in PostGIS
I have a river network (Line with arrow as shown in image below) and I need to create perpendicular lines to the river at every 15 meters as you walk along it (see image below).
Is there a function in ...
- 5,048
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2
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Decode Google Polylines in JS
I am a complete novice at coding and am trying to return a decoded polyline in array of (lat;lng) from an encoded polyline string.
I found a similar post here
Converting encoded polylines into GeoJSON ...
CommunityBot
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votes
6
answers
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Creating all possible line segments between all points using QGIS
I want to connect all points in a point feature with every possible line segment using QGIS.
For example, how a pentagon has five points with ten line segments connecting them all to form a pentagram ...
- 32.9k
2
votes
3
answers
654
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Connecting thousand of points in QGIS
I have thousands of points generated along river channels. I am trying to connect these points based on distance. Furthermore, I tried "Join attributes by nearest Points" and "Geometry ...
- 32.9k
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1
answer
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Creating line layer with features using PyQGIS
In QGIS GUI, a line feature is created using this icon
How to create a line with a fixed distance from a vector layer using PyQGIS.
This my example:
from qgis.core import *
from qgis.PyQt.QtCore ...
- 65.2k
6
votes
1
answer
177
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' ...
- 71.2k
3
votes
1
answer
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Using points2one plugin in QGIS
I downloaded the points2one plugin and tried many times to connect points to a line, but it never worked.
Is there something that I set wrong?
I tried the answer, but it has been running for 10 ...
- 32.9k
2
votes
2
answers
197
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 ...
- 71.2k
6
votes
1
answer
107
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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 ...
- 32.9k
8
votes
2
answers
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Building the shortest route through all points in QGIS
How to build the shortest route through all selected points, starting from a given point? Which plugin to use?
There is a point layer and a linear layer for all routes between points.
- 32.9k
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1
answer
136
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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 ...
- 32.9k
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votes
0
answers
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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 ...
- 101
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votes
2
answers
2k
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Connecting two nodes with line to close segment in QGIS
I have a line that I drew where the ends are not connected. I now want to select the two end nodes and hit a button to have QGIS connect them with a line segment. How do I do this?
- 71.2k
53
votes
8
answers
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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 ...
- 32.9k
4
votes
1
answer
186
views
Creating horizontal lines connecting points using QGIS Geometry generator
I am using the geometry generator to learn how to generate vectors using expressions. Currently, I have a point vector, and I would like to create horizontal lines (shown in red: manually drawn) ...
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votes
1
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260
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Adding vectors (segments) connecting pairs of points from CSV file in QGIS [duplicate]
a) Given: In QGIS 3.28 I have two sets of points: Points M and Points N (See embedded image), given by their coordinates in a CSV file.
b) Required: A set of vectors (or segments) connecting the pairs ...
- 32.9k
3
votes
2
answers
347
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Generating lines at the end of each measurement with plugin in QGIS
It would be very useful to have a tool like this when measuring and even more useful to generate lines at the end of the operation.
I use this plugin which is part of a small GIS program (Map Maker 3....
- 71.2k
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votes
0
answers
52
views
Unable to convert raster to polyline
I'm having trouble successfully converting a raster to a polyline feature in ArcGIS Pro. My ultimate goal is to take the values from a raster image and join them to a line layer so that I can ...
- 65.2k
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4
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Joining lines when direction is not known
I am struggling with this problem: I have a polyline made up of several segments. Each segment is made up of points, each point identified in 3D space by coordinates and elevation. Together, if ...
- 3,126
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votes
6
answers
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Drawing lines from points in QGIS
I have a point layer and need to draw a line passing through or in the vicinity of the points (up to 0.5m distance between the point and the line).
The nodes of the line will receive the attributes of ...
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votes
2
answers
208
views
Ordering points when making line in QGIS Virtual Layer
I've got a QGIS point geometry layer with four point features and a numeric field sequence. I want to create a virtual layer joining these points into a line geometry layer (which will have one ...
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votes
6
answers
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Converting polyline to polygon in QGIS
I have a shapefile with city areas, but unfortunately the shapefile only contains single lines. The shapefile looks like this:
I want to convert those lines to an area-polygon shapefile in QGIS. I ...
- 10.3k
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votes
4
answers
4k
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Calculating line with the longest distance inside polygon in QGIS
I want to calculate the "diameter" of polygons in QGIS. The "diameter" is defined as the distance between the two most distant points of the polygon.
I couldn't find a fitting ...
- 32.9k
1
vote
0
answers
58
views
Creating line inside polygon using QGIS
I do have polygons in different shapes, most of them squeezed.
How can I create one line inside each polygon, along? I have checked it in QGIS but could not find a way to do it.
I have tried to create ...
- 32.9k
6
votes
1
answer
240
views
Creating feature from multiple LineStrings using PyQGIS
I am trying to create a closed LineString made of a number of CircularSrings, but have got stuck. I cannot see how to add the geometry from both strings.
This is what I have so far. QGIS version 3.4....
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2
votes
1
answer
57
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Merging polylines to next one in QGIS
I'm working with QGIS and I'm not super familiar with that.
I created a Shapefile with several polylines. In some cases, my polylines do not match each other directly. For further proceedings, I would ...
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votes
0
answers
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Recalculating chainage values from a parallel line
I am currently trying to recalculate the chainage value of one line in contrast with another parallel line.
I have two polylines layers and their corresponding chainage (two layers in point geometric ...
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34
votes
1
answer
10k
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Drawing perpendicular lines in PyQGIS
I have a situation like this:
What I need to do is to connect each point to every line that is at most, let's say 200 m, away from the point. In other words, I need to draw a perpendicular line from ...
- 32.9k
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votes
4
answers
336
views
Importing points from CSV file with NaN as vertical separator in QGIS
I am importing a CSV file with the coordinates of several points forming some kind of circle structure. The different circles are separated in the file table with one line of NaN, NaN.
When I import ...
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1
vote
0
answers
68
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Function to get style called repeatedly - Angular OpenLayers
I have a functionality where I can modify a polyline by dragging its coordinates over the map. In order to visually separate it from untouched polylines, I apply a new style when creating the ...
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votes
3
answers
203
views
Getting layer attributes along path between two points in QGIS
In QGIS I have a map of source [square] and receptor points [circles], see map. I also have a layer with ground-type data (Corine Land Type 2018). I want to know how the ground type changes along ...
- 32.9k
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4
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Creating Isochrones in QGIS
In QGIS I have tried to create isochrones around points for quite some time. Is there any option to create isochrones on the GUI in QGIS?
I know how to create them using pgAdmin (using e.g. @underdark'...
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0
answers
117
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How to calculate the polyline area in QGIS
How to calculate the polyline area in QGIS?I have the width and length and I want to calculate the area of the river using that information so I can redraw my river using the area size calculated. ...
4
votes
1
answer
240
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Drawing line arrow from origin/destination coordinates fields using Geometry Generator in QGIS
From the following table structure with the fields "ORIG_LATITUDE", "ORIG_LONGITUDE", "DEST_LATITUDE", "DEST_LONGITUDE":
I clarify that the field names ...
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0
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1
answer
54
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Create a point/Polyline on map
I am new to ArcGIS JavaScript API.
With below code, am trying to add a point/Polyline on the map
Spatial Reference is 2881
for Example POINT (914723.27587074414 524669.72858949) and PolyLine(912367....
2
votes
2
answers
190
views
Connecting points by line number and code in QGIS
I am looking to connect points with a line using Geometry Generator or Virtual layer. Each point has a unique number, a code and a line number. The goal is to display in QField application the lines ...
- 16.9k
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vote
1
answer
68
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QGIS merge line within 1 long line
I have a long line, which is separated by nodes. How could I merge them to make just one very long line?
This is a similar query here:
Join / merge lines that touch and intersect in QGIS
But is it ...
- 71.2k
0
votes
0
answers
173
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ArcGIS Pro: Convert Multipatch Shapes to 3D-Polylines
Multipatch shapes which represent tubes should be converted to a 3D-polyline which will represent the the trajectory of the tubes (i.e. the center of the rings which build the tube). The tubes are ...
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votes
1
answer
1k
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Drawing line between two places with via-points
I have prepared a GPS-tracking dataset, currently consisting of one table with stopping points and one table with the raw GPS-points. The first table contains a column for any stopping point showing ...
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2
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Extracting Transit Layer polylines (e.g. subway lines) and using them in Google My Maps?
I am trying to create a Google My Map of Tokyo Metro and Toei Subway lines. So far, I've been painstakingly drawing the subway lines manually, only using a mouse. Here's what I've got so far (WIP, of ...
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