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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Midpoint coordinates from line in Field Calculator (QGIS)

I'm looking for a way to collect the mid-point coordinates of my LineString type Shapefile using the Field Calculator. What I've already tried was x(centroid($geometry)), but this calculates the mean ...
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1 vote
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29 views

Flux maps (?) in QGIS

How this kind of map that I think is called "Flux map" can be performed in QGIS? I'd like to implement it in a time model of wind streams.
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Calculate angle between two furthest points

I need a way of automating this whole process rather than measuring the angle manually. I want to calculate the largest viewing angle from each of the viewpoints (red dots) in relation to the ...
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Split polylines at each polygon boundaries in QGIS [duplicate]

How to split polylines at each polygon boundary in QGIS ?
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2 votes
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15 views

How to export KML file without having layer name in front of field name in QGIS

I output the KML file from shape file (line). It's include the description of the distance of line. When I output to KML, it showed the layer name in front of Field name (e.g- 11:Descriptio - 648.38 ==...
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32 views

Merging all lines with only one connecting line in QGIS

I have a line layer consisting of road links. Some of these are connected to the next link only through one node (not in an intersection). I'd like to get rid of these non-intersection line breaks and ...
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Automatic Label positioning next to Line Layer in QGIS

My labels are always right on the line they are related to. I can´t find an option to automatically position them next to the line and not right on it. I think I tried all the options. I work with ...
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1 answer
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Making middle point going on curve lines in QGIS

I've these lines so when i want to point the middle by going to Vector > Geometry Tools > Centroid the point goes on the Straight line only, but when i have lines with curves the point doesn't ...
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Cutting Lines By Set Amount in QGIS

I have a large set of lines in a rough grid formation which run in a N/S and E/W direction and fill an irregular shaped polygon from edge to edge. I need ideally to cut 1500m from the end and start of ...
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Calculating missing points on line vector in QGIS

I have a linear vector of a river subdivided in 55 traits, all connected to each other. In 5points along the river i toke some measurements. What I want to do is to calculate the values in the 50 ...
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4 votes
1 answer
33 views

Adding/concatenating multiple values in column when using line intersections in QGIS

I want to use the "Line Intersection" function in QGIS to create points wherever lines cross. The lines are roads and I need the road names in my points layer. Does anyone have an idea how I ...
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1 vote
2 answers
37 views

Extending lines to edge of polygon, but not where start/end point intersects another line

I have made center line dataset from polygons. However, at the endpoints these lines didn't extend to the edge of the polygons. So I used the FME line extender tool, to extend the lines by large ...
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  • 438
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1 answer
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Add another set of coordinate values in the same point entity in QField (line start and end)

In an attemp to add another set of x,y coordinate to QField (mark the start and the end of a line feature with points) I have created another set of "lat" "long" fields linked to a ...
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2 votes
1 answer
44 views

Getting line length of geometry of parent feature as default value in child feature in QGIS

I have: a parent line-layer 'MyParentLineLayer' (referenced layer) with a field "parent_uuid" (referenced field). a child geometryless-layer 'MyChildLayer' (referencing layer) with a field &...
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41 views

How to create line data with start and end x,y coordinates that also follows a road network shapefile in QGIS

I am using QGIS. I currently have a road network that some work is occurring on here and there and I need to produce line data that shows exactly where along the network the work is happening. I have ...
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2 votes
1 answer
47 views

Use polygon lines to create masks

Given a tile (the cropped base map in the left) and polylines (red lines), is there any tool/workflow in QGIS to convert them into masks in the right?
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QGIS how to draw a circular polyline?

I would like to draw a semi-circular pattern (arc) on QGIS as a polyline. I did it before but have no idea how I achieved it. I am on QGIS 3.16.4. I would like to replicate the black arc lines called &...
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  • 137
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1 answer
52 views

QGIS Offset Points by value

I've got one layer with a line (e. g. a road) and one layer with points (e. g. trees along the road). So far, the points are placed right on the line, but the attribute table of the point layer has a ...
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3 votes
1 answer
50 views

Creating lines indicating the shortest distance points to line in QGIS [duplicate]

How can I create lines indicating the shortest distance from a points dataset to a to line, avoiding the line to points tool first? In the past (at another company) we used MapInfo "Distance ...
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2 votes
1 answer
46 views

Symbolizing line thickness by M-values

Is there a possibility in QGIS 3 to render line thickness by M values on every vertex? The new Interpolated Line symbol layer type introduced in version 3.20 seems suitable for the task, but so far ...
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3 votes
2 answers
150 views

Selecting the maximum value from series of polygons that intersect with line in QGIS

Is there a way to select the cell (single) with the maximum value in a polygon layer using the intersection of a line? The first image is the grid (polygon) layer with the attribute field "VALUE&...
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2 votes
0 answers
51 views

Create lines between points layer and line layer (but not the nearest)

I'd like to create lines between a point layer and a line layer, but not in shortest line function in geometry generator. I using this command in geometry generator: make_line ( $geometry, ...
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0 answers
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labeling line on qwc2 - bad position

We use QWC2 to show lines of our energy-network. The lines are labeling with the name of the line (e.g. M30001 or M10001 like the screenshot). Unfortunately, the label is every time at the frame of ...
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2 votes
1 answer
54 views

Creating new polygons from intersecting polygon and polylines in QGIS

I want to create new polygons from the intersecting polygon and polylines shown in the images below. At the output, I need to get four polygons representing the polygons shown in the top image after ...
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  • 199
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1 answer
38 views

Extract Elevation data from DEM and add Z-Values to Polyline file

Is there an efficient way to add elevation data from a DEM Raster to a polyline shapefile? I am attempting to add elevation data to a city roads shapefile to map out flash flooding issues. The streets ...
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1 vote
1 answer
64 views

QGIS autoadjust the line to another existing line nearby

I have the line created by the "Point to path" function. The algorithm produces just a straight line, whereas I would like to have this line auto-adjusted to the other line (or buffer) which ...
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-1 votes
1 answer
63 views

Clip Line Layer to Polygon but retain the Lines outside the polygons

I want to clip a line layer to a polygon layer, but retain the lines outside the polygons. Can anybody assist me in doing this please? On the image included, the lines are in red and the polygon in ...
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2 votes
1 answer
50 views

"One or more line ignored due to geometry not having a minimum of three vertices" error when "Line to Polygon" in QGIS

Converting "Line to Polygons" using geometry tools in Vector could not be executed results shows this picture How to solve this issues?
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11 views

Measuring length of polyline which overlaps polygon in ArcGIS Online

I want to measure the length of a polyline which is not completely within a selected polygon. I want only the length of the polyline which overlaps the polygon.
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2 votes
1 answer
75 views

How to get a list of lines, with a list of polygons that they intersect? [closed]

I am a new user in a PostGIS environment and don't even know where to start. I have two tables, one storing lines and the other storing polygons. I to create a query that can be used to get a separate ...
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2 votes
1 answer
76 views

Clip a line that overlaps two polygons in QGIS

Is there a way to clip a line that overlaps two polygons in QGIS? The line needs to be resized to either the poly/line intersection on the inside of the polygons or the poly/line intersection on the ...
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  • 105
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0 answers
23 views

Making line thickness based on the sum of overlapping lines in QGIS [duplicate]

In QGIS 3.22.2 I have used the ORS distribution calculation tool to work out the number of vehicles that go from one origin to multiple destinations. I am trying to represent this number as a line ...
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0 votes
1 answer
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Polyline endpoint query layer in ArcGIS Pro

I have an Oracle 18c/SDE.ST_GEOMETRY polyline FC (15,000 features). I want to create a query layer (or db view) that will display the startpoints and endpoints of the lines in ArcGIS Pro. Is there a ...
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1 vote
0 answers
46 views

Leaflet multiOptionsPolyline - draws color on the next segment instead of the right one

It's my first time using multiOptionsPolyline to draw a multicolor polyline from an array of LatLng points, with red segments if distance is smaller or equal to 90m and green if bigger. var polyLine = ...
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4 votes
2 answers
215 views

Drawing lines that overlap inside the perimeter using QGIS

I want to make a map, with two plots. I want to draw them only with a line along the perimeter of each one, with different colour. My problem is that when the lines overlap, only one colour is showed. ...
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2 votes
0 answers
27 views

Generating Points Along Lines not starting at the start of my line feature

I am trying to generate chainage points in 50m intervals on a road system including the start and end of the line. Each road is its own single continuous line and while attempting to solve my issue, I ...
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3 votes
1 answer
45 views

Splitting line-layer with point-layer in QGIS

I have a separate layer with polylines that are merged into one object. I want to split it by a separate layers with points in QGIS. I have tried using the SAGA tool "Split Lines at Point" ...
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1 vote
0 answers
17 views

Dissolve features based on attribute and a distance

I have a streets layers where the lines don't align. There are multiple features/rows for the same street and the lines are not connected (see picture for how they look). I want to connect these lines ...
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0 answers
18 views

Points in lines extraction of coordinates automate

I'm currently working on a project with ArcMap. I'm having a problem on how to extract the x,y info of all the points in a line, meter by meter. This is the problem & objective: So I have 1 line, ...
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3 votes
1 answer
79 views

Appropriating ID for all lines inside polygon in QGIS

I have 12 Polygons with a lot of lines in every Polygon. The Polygon have each its own "ID". I would like to add the "ID" of the polygon to the lines it is containing.
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1 answer
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Add line shapefile to 3D raster plot in rasterVis

I have generated a 3D raster plot using the plot3D function in the rasterVis package in R. For enhanced data visualisation, I want to add a line shapefile, representing a sampling transect, to the 3D ...
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0 votes
1 answer
96 views

Create point feature at line intersection and split lines - R [closed]

I have a shapefile that shows all the roads in Germany. Hereby, I want to create a point at each intersection of lines. Based on this created point, I can split the line into separate line features. ...
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4 votes
1 answer
102 views

Rotating point layer according to line layer in QGIS

I got two layers: (1) a line layer with water pipelines and (2) a point layer that shows hydrants and so forth. The points are located, mostly, on the line layer. For the symbology of the hydrants i ...
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  • 457
0 votes
1 answer
36 views

Using ArcGIS Pro tools to determine front of polygons in relation to street lines

I am looking for help to develop a process to identify the sides and lengths of parcel polygons in relation to streets to determine the 'front' of the polygon, i.e. facing the street, so I can then ...
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7 votes
4 answers
218 views

Generating dangle point for polyline in QGIS

How do I generate the dangle points (into shapefile or something) (blue dots in picture below) of any polyline in QGIS? These are not start/end vertices.
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  • 680
1 vote
1 answer
82 views

How to export DXF lines and polylines into one shapefile in QGIS

I imported a DXF file into QGIS and now after editing it, I wish to save different parts of it as a shapefile. When I go to save the layers by highlighting the ones I want and pressing right click >...
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  • 140
1 vote
0 answers
34 views

Calculating shortest distance between points within polygon using QGIS Continued - by group and ordered by longitude

I am trying to use something similar to the least cost paths in SAGA in order to draw a line through various points, grouped by unique ID levels, and ordered by longitude, and restrict it to a raster. ...
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1 vote
1 answer
20 views

How to calculate Beginning and End Intersections of Polylines?

I have ArcMap 10.8.2 and am working with road networks consisting of intersecting polylines. Each segment has its own ID and I would like to calculate its position relative to other segments. The ...
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  • 261
1 vote
0 answers
33 views

Capturing accurate polygons from field data

Drawing out a new polygon with snapping enabled to closely follow the vertices of the track line that I have seems to work, but I get the impression that the track itself has far more information that ...
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3 votes
1 answer
94 views

Visualizing a polyline with decreasing width towards one end (QGIS)

I am acquiring data related to the hydrography of a territory. I would like to use a symbology that allows me to have a line whose thickness decreases as it reaches its end (like the example in the ...
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