Questions tagged [line]
A set of ordered co-ordinates that represent the shape of geographic features too narrow to be displayed as an area at the given scale (contours, street centrelines, or streams), or linear features with no area (county boundary lines)
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Moving (snap) lines to nearest features in QGIS
I have two sets of lines: Layer A (a planned network) and Layer B (how the network was realized). The course of the lines on those two layers is similar, but not the same and they do not have the same ...
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Closing open polylines to create polygons in ArcGIS Pro [closed]
I have a large file with right-of-way lines displaying the edge of roadways. I am trying to create polygons that encompass the entire area within these lines but have stumbled upon a handful of issues ...
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Uploading transit data to QGIS
I'm in QGIS and I've got a map of all the bus routes. The only problem is that they are all one layer, and I can't color each route individually. There isn't a property (as far as I can tell) that can ...
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QGIS: Problem to rasterize track
I'm not able to rasterize a GPS plot in QGIS (layer Chemins in red which is interpolation of GPS points) , the output is empty even though it works when I tried with a new simple layer with two line (...
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Difference of two polyline layers in QGIS
I have an original polyline layer and a modified one representing only a part of the original network. In an example case I cut 10 meters at start and end of each feature using Geometry by expression ...
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Removing lines that intersect with other within the same layer
This may be very simple, but I have a line feature class in ArcGIS and I want to remove all the lines that intersect other lines in the feature class. So in the example below, I would like to remove ...
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Create alternatingly colored line segment in QGIS
I have a request to carry out a task which resembles Creating alternatingly colored line from points layer in QGIS.
Is it possible to achieve an alternation of color between sections (several lines) ...
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Extract specific lines from multiple layers
In QGIS I have 16 layers (polygons) which represent the extents of shoreline erosion/recession at different time scales and scenarios into the future. Each layer contains 10 polygons. What I want to ...
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Determine area enclosed by multiple segments
I am trying to determine the area enclosed by multiple linestrings. For example, in the following picture, I have 4 linestrings, forming 2 closed polygons. I'd like to be able to get the coordinates ...
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Want to curve lines that are already connected (not drawing)
I have three layers. 1 point data with slaughterhouses, 1 point data with stores, and 1 line layer connecting the two (I connected them using the plugin "Connect points").
I want the lines ...
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ArcGIS Pro 3.2 fill gaps line section using another line layer
I extracted two lines layers of road condition. One was surveyed when the roads were dry. The other layer is when the roads were wet. The dry layer has some gaps
And I want to fill these gaps with the ...
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How do I find the length of part of a line segment that crosses a polygon boundary?
I have a street centerline table and a borough boundary polygon table. I want to select any centerlines that cross borough boundaries and also return the how much of that centerline is crossing each ...
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Using label placement via PyQGIS
In QGIS 3.28 I am trying to align my labels along line features but cannot get them in curved mode. I tried:
layer = iface.activeLayer()
layer.placement = Qgis.LabelPlacement.Curved
settings = ...
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How to clean dangling ends from bathymetric lines so they can be polygonized? [duplicate]
Problem
I want to turn bathymetric lines into polygons. However, the bathymetric line datasets have multiple dangling ends within them. Because of this, the 'Lines to polygons' or 'Polygonize' tools ...
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Finding number of lines touching intersection point in polyline layer using QGIS
I am trying to calculate the number of lines touching an intersection point to calculate the number of 3-way, 4-way (etc) intersections within my polyline layer. E. g. when 4 lines are connected to an ...
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Cross-slope of a trail in ArcGIS Pro
I am trying to make an accessible map that includes the typical and maximum slope and the typical and maximum cross slope. I understand how to determine the elevation profile of the trail, but it is ...
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Creating relation for duplicate lines
I have two datasets with some duplicate lines. I can select the duplicates with GRASS v.select:
v.select ainput=map1 binput=map2 output=duplicates operator=equals
or QGIS Select by Location:
...
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Generate shortest straight path between points and a given elevation in QGIS
I'm trying to do terrain analysis in QGIS.
I have a vector layer with equally spaced points along a slope, and these points are somewhat parallel to the coastline of a fjord:
I'm interested in ...
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How to draw 8 lines away from every point in a layer using QGIS?
In QGIS I have a layer of many points, and I am trying to draw 8 lines of radius, r, from each point outwards, in the eight windrose directions (N, NE, .. etc). What is one method that can be used to ...
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Is it possible to split a polyline into three equal segments that are rounded down to the nearest integer without allocating the remaining amount?
I need to split polylines that are over 900m into three equal segments. I need the segment lengths to be integers that are rounded down without the remaining amount being allocated to either the last ...
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Identifying near continuous line features in a broken network
I have a line dataset which contains thousands of records, the network isn't continuous and it is broken in many locations. The aim is to find potential routes which are continuous in long sections, ...
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Creating equidistant points along polyline with multiple objects
I want to create equidistant points along a polyline layer that consists of multiple objects. The problem using the "point along geometry" tool in the QGIS processing toolbox is that every ...
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Find the median line from the input broken line
I already tried to use ST_Simplify, but as the result Wrong Line was gotten, because the function reduced the number of points significantly and curvature was lost.
Is it possible to get the Desired ...
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Draw line between China and South America through the Pacific Ocean in Leaflet
I am relatively new using Leaflet.js. I want to draw a polyline in Leaflet.js between China and South America through the Pacific Ocean. Instead, I can only draw this line through both places through ...
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QGIS 3.22.16 Selecting points near lines
I try to select and delete some roads (lines) that have a False value in the attribute table. Along with that, I need to delete all the gullies (points)along these road. I don't have any related Field ...
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QGIS 3.22.16 Split road lines at polygon border
I am using the QGIS 3.22.16. I tried to get the length of the roads in each county. I used the clip tool however the road length of the ones crossing the boundary still the same length. By any chance ...
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Adding slope to lines drawn using PyQGIS
I want to add a slope to lines drawn using PyQGIS. The lines drawn with PyQGIS are currently green, but I want them to appear brown. How can I achieve this?
The code I wrote:
import math
from qgis....
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How to convert turn-by-turn text directions into polyline data
I am interested in converting turn-by-turn text directions into polyline data.
For example, the turn-by-turn text directions would look like this:
STARTING AT 1805 VICTORIA DR - SOUTH ON VICTORIA DR ...
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Multiply line using style in OpenLayers
I'm working on a map application, where I should display multiple routes, each with its own name and coloring. In some locations, there are multiple routes following the same path.
Is there a way to ...
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Create wider selection area to select lines on map using LeafletJS
When there are thin lines on the map, it is very difficult to click them with the mouse cursor. So is there any option to wider the selection area for lines in LeafletJS, without increasing the line ...
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Placing label along line problems
I would like to get the map rotation python code (it varies depending on the atlas rotation). My goal is to create a label along a line offset in a perpendicular direction. I am using the code: , but ...
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Split a line using "Split lines by maximum length" does not generate a result using QGIS
In QGIS I try to split a line of 11.7 km length into segments of 450m plus a rest. I tried to use "Split lines by maximum length", but it just does not work.
For some reason, to the right of ...
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Create Points to Line in QGIS while keep all information of points
I am creating a storm track using HURDAT2 data which provided by NOAA. Provided Storm track information available in points like below snip (only sample)
Earlier with help of Previous version of QGIS ...
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Combined style for GeoJSON line in Leaflet
In leaflet I have a GeoJSON of line type. I want the latter to have two styles, the solid color in the background and a dotted line inside, as shown in the following image:
In the image, I have two ...
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Function to draw lines based on starting point, angle and length
I have used an R script to calculate the distance from a point within a polygon to the edge of the polygon at 1-degree increments. This has been saved as a CSV file. I am now wanting to create a ...
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Trouble with a line intersection algorithm
So to put this in perspective, I have a DXF file, I parsed the lines from the DXF file and I have to create polygons from those lines. I decided to save the created polygons from those lines to SVGs ...
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Calculating new id with suffix for another id field that has duplicates in QGIS
I have a linear dataset that has a unique "ID" for every row, but many of the linear features needed to be segmented. After segmenting, there are some rows that were split into two, three, ...
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ArcGIS Pro: Counting points near a line within a sliding window
I am trying to determine a solution to this problem in ArcGIS Pro:
We need to generate a count of points that lie within a specified distance of a line, evaluated within all contiguous 1 mile sections ...
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Advanced QGIS Marker Line symbol controls
With a line geometry layer, I can use a "Marker Line" symbology element to regularly space markers along a line, for example every 20mm, even if there's no line vertexes there. I can also ...
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Splitting lines and deleting segments in QGIS
I have created a line that I now want to partially delete. I tried to do it with "split feature" but it didn't work. The wohle line deleted automatically when using this function.
As you ...
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Plotting transect line with equally spaced points and get the coordinates in QGIS
In QGIS I am trying to plot a transect line. For this I would like to place points every 500m along a line and get the coordinates of each point, but have not managed to achieve this unfortunately.
Is ...
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Width of lines determined by attribute value in SLD in GeoServer
I read in Size of points determined by attribute value in SLD in Geoserver, that it is possible to set the size of points via an attribute supplied by the data source as follows:
<se:Size><...
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Drawing arrow only at the start and end of a line string in OpenLayers
I want to draw an arrow only at the end and start of the line string. The arrow should point in the direction of the last / first segment. I have found one way to do this, but it leads to bad ...
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Create dashed lines in QGIS that will export as dashed in a GeoJSON file
I have a project that has several lines in QGIS. I know how to make them display as dashed in QGIS, but I need to make them into actual dashed lines instead of just displaying them as dashed because ...
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Creating dotted line in OpenLayers with outline and fill color for each dot
I want to create a line style with dotted lines, where each dot has an outline color and a different fill color. I know how to make dotted lines, but is it possible to have different colors for the ...
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Is there a format like polyline6 but with altitude for API
I develop a REST API and need to send/receive coordinates with their altitude.
For now we only needed latitude and longitude so we were using Polyline6 to have an efficient way to transfer data.
...
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How to add attributes to connected elements
I have a Points dataframe (shp). Those Points are connected via a lines (polylines, each element only connects two points) (shp). I would like to choose manually two points (in the picture the yellow ...
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QGIS, place points on polylines by name of the the polyline and linear distance along that polyline from a CSV
I have a CSV file with mileposts for road hazards on named roads, but I do not have coordinates. I have a polyline GeoPackage layer with said roads. The road names on the hazards CSV and road gpk ...
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Automated way of connecting line features with dangles in ArcGIS Pro
I have a line layer with around 9000 features. There is disconnectivity throughout the dataset Is there an automated to connect these?
Attached are examples.
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QGIS - Electrical Power Grid: getting the value from a previous line
I am working with two layers. One of them is a set of lines supposed to represent the electrical grid of a city. And the other one is a set of points representing the utility poles of the grid.
The ...
