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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4
votes
1answer
129 views

Linear referencing to calculate maximum distance between points by group along line (river system) using ArcGIS Pro

I am using ArcGIS Pro. I have a series of points representing animal locations that were tracked in a small stream. I would like to get the distance between the most upstream and downstream location ...
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1answer
31 views

Attach features of lines to points

I am trying to calculate the cost of network to homes. In the image i have cable (brown line) between utility boxes(pink/blue points) and home feed (black dash) to the home. I know the cost for each ...
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0answers
87 views

Smooth contour lines/correctly extract contour lines from a DEM in QGIS

I have a DEM obtained as a result of the interpolation of elevation points TIN Interpolatin: I extracted the contour lines in QGIS and the result is this: After I tried to apply the Line Smoothing ...
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1answer
44 views

ArcPy Raster to Polyline outputting empty shapefiles and a 999999 error?

I am running a lengthy script to post-process raster channel paths into polylines so I can measure their length using Add Geometry. Script runs well until I go to convert the rasters to lines using ...
2
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1answer
81 views

Simplified lines disappear in smaller zoom levels in ArcGIS JavaScript v.4.14 map

I have a GraphicsLayer on ArcGIS js map with many lines of varying lengths (1 to 200m). However, in smaller zoom levels the short lines disappear. For example, in the images below the red lines are ...
3
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1answer
81 views

Exporting shapefiles as SVG polylines

Recently I've been using QGIS to create fracture tracemaps as line shapefiles. I need to export these lines as an SVG that uses the tag polylines rather than paths. I've used the SimpleSVG plugin but ...
1
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1answer
32 views

Put the start and the end name of a point object into the layer of the line object that connects them? [duplicate]

I am new to QGIS. I am given two layers with point objects. In their attribute table each of this objects has a code (name) given previously to it by someone else. Then I import the lines from AutoCAD ...
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1answer
52 views

A simple way to merge lines separated by a space in QGIS

In QGIS after creating contour lines by extracting them from a DEM (Extraction > Contour) and smoothing them (Line Smoothing) I noticed this situation: In order to smooth out the corners ...
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3answers
295 views

QGIS alternatives to GDAL contours to polygons

I have Windows 7 running 3.10.2-A Coruña. The only success I have had in creating nested polygons from a raster dataset is using GDAL with -p to create polygons. However, I recently cancelled the ...
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0answers
51 views

Adding break/vertex on a polyline from points

I have a polyline which consists of just one geometry. I have points which are evenly spaced (25m). How would I add these point vertices to the line so that the points will create one line segment/...
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2answers
745 views

Which method to find intersection between lines with polygon

How could you find intersection between lines intersected with polygon? I want to find the lines only that located inside the map and intersected with polygon then change the colour of intersected ...
4
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1answer
81 views

Align labels on a vertical line

I have a series of contour lines with relative elevations (Z value). I am trying to align the labels so that they are all on the same imaginary line. It's a process that I usually do with Autocad ...
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1answer
115 views

Find lines whose both start and end point ends in a polygon

I have a river dataset, which is dissolved, so between two lakes there will always be one single river line. Now I want to find all rivers that starts in a lake, and ends in a lake. So if my rivers ...
2
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1answer
143 views

Where is the “Intersection” tool located in QGIS 3?

I would like to generate the intersection between lines and polygons lines and polygon in QGIS 3 and extract the id number for each line. I would like to assign a red color to the resulting lines ...
0
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1answer
103 views

Joining more than two lines that intersected in one point using FME

i have point connects with four lines in dgn file Each line has his unique id ,iam usng FME 2018 software i used line combiner for the map ,i found only ,each two lines is able to connect together ....
4
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1answer
166 views

Converting polygon to line in QGIS

When I'm doing "polygon to line" analysis on ArcGIS the result is individual line features but in QGIS is not. How can I execute "polygon to line" in QGIS where each polygon becomes individual line ...
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1answer
37 views

QGIS 3.10 Populate attribute table with ellipsoidal distances along lines

I have a GIS with a logistics layer that contains line features. The lines have been digitised from aerial photography and each line represents a path from A to B, following roads, rail and waterways. ...
2
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0answers
39 views

Measuring line input in attribute table

I'm using QGIS 3.10.0 A Coruna. I have a polygon layer (buildings) where I would like to measure each side depending on its geographic direction (north, east,...). I'm using the tool "Measure Line", ...
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0answers
25 views

Create polylines from CSV in QGIS [duplicate]

I have a CSV with 500 ship routes. Every row is a different trip and the columns have the values of ship_name, lat_1, lng_1, lat_2, lng_2,lat_3, lng_3... lat_20, lng_20 How can I insert this ...
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0answers
17 views

Average raster value between points

I have a rasterized stream network, with point (species presence) data overlaying it. What would be the basic workflow for determining the average cell value between all possible combinations of ...
4
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1answer
77 views

Splitting self-overlapping lines with points using PostGIS

I have a line geometry that partially overlaps itself (think about a line going A -> B -> C -> B -> D) and a set of points (not on the line but close to it) that I want to use to split the line in ...
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0answers
20 views

Polyline to Raster - Thicken overlapping lines

I have a featureclass with around 300 polylines. Since the all follow a route network to a single point, as they approach this point many of them overlap. What i want to do is to rasterise the ...
6
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7answers
373 views

Creating point at line end using QGIS

For an examination of a local power grid, I need to mark the transformation stations (substation) by simply create a point for each station. What I want to do is that QGIS creates a point at the end ...
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0answers
25 views

Distance be between points: XYtoLine “Length” different from Add Geometry Attribute (geodesic) “length geodeisic” (ArcGIS Desktop)

I have a set of coordinates (WGS_1984) for patients home locations (Point A) and the first facility they visited (Point B). I want to calculate the distance between point A and B for each patient. I ...
3
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1answer
135 views

Calculating intersection angles of multiple polylines QGIS

I have one vector layer of multiple polylines that intersect each other in QGIS. What I want to do: calculate all intersections angles (2-ray, 3-ray, 4-ray and 5-ray types) in this vector layer. What ...
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0answers
48 views

Is it possible to merge multiple polylines into one

I have vehicle GPS coordinates of the route. In my case vehicles can drive through one road multiple times, so overall it can look like round trips. Is there any way to merge two traces into one, so ...
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1answer
51 views

Conversion TIFF to shp, duplicates polygons [closed]

The purpose of my project is 512 KML tiles which represents an entire map. By editing the KML files I realized that there is redundancy of the polylines. So I look for why and it happens to the ...
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1answer
42 views

Measuring length from one polyline vertex to other polyline

I have two polyline which represent the river bank of a particular section of a river drawn based on Satellite imagery at 1984 and 2019. As you can see in the picture, it is drawn in red line with ...
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0answers
78 views

Simplify line in QGIS

I have very long curvey line which I want to smplify. I have used the simplify tool on QGIS but it is still not simplified enough. Tgose are the parameters I have used: The thing is that I still have ...
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1answer
53 views

Joining point layer with line layer using coordinates

I am using QGIS 3.14, and I want to represent a road network. I had a polyline layer (3257 entities) as a background. For each one I have calculated x_start, y_start, x_end, y_end coordinates, length ...
2
votes
1answer
91 views

Copying set of points perpendicular along polyline

I have a polyline which represents the middle of a river. Perpendicular to this polyline there is a layer with a set of points. These points all have an "X" and "Y" coordinates as well as a height ...
6
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1answer
210 views

Creating outer glow effect depending on the graduated symbology color of a shapefile - QGIS

I am working with a line shapefile that represents the road network of a city. I used a graduated symbology to draw each roads depending on their attribute value. Now, I want to get the outer glow of ...
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2answers
58 views

Create a polygon to wrap around polyline features in QGIS 3

I have a series of polylines representing sewer mains, with an attribute indicating the network it is in. Is there a way to create a polygon that wraps around all of the polylines with the same ...
1
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1answer
30 views

Slope and side-slope of vineyard rows

I have a question about interpreting the slope and side-slope of vineyard rows using a line vector layer and a DEM. I am trying to calculate the slope along the row (split into 2 meter lengths) as ...
0
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1answer
92 views

Lat/Long WKT field to line geometry

I'm working with data containing multiple lat/long entries within a single row. I am using PostGreSQL to process the data. Is there a way to take the WKT lat/long field and convert it into a line geom ...
4
votes
1answer
106 views

How do I construct a line from points that are out of order?

I'm using ArcGIS Pro and would prefer solutions using ArcPy, ArcMap, or ArcGIS Pro, but an open source alternative may work too. I'm trying to construct a line from a series of points using the ...
3
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3answers
83 views

Generalising lines of varying detail in QGIS

I am trying to generalise a line in QGIS so that I can export it as a vector without it having an unnecessarily huge file size. The line shows the GPS track of a road trip, and as such varies between ...
1
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1answer
70 views

Getting bike lane length with QGIS?

I am trying to get bike lane lengths from the following data set. To do so I have tried using the add geometry attribute from the processing toolbox. I have tried both calculate using Layer CRS and ...
0
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0answers
132 views

Getting polyline midpoint coordinates using ArcGIS REST API

I have an ArcGIS 10.7.1 feature service that integrates polyline GIS assets to a work order management system. In the work order management system, I want to retrieve the midpoint coordinates of the ...
0
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1answer
52 views

Remove parts of line layer [closed]

I have a shapefile layer in QGIS containing Europes coastlines. I want to extract only Norways coastline from this. If I make a polygon layer that overlaps only Norway and then use the Vector ...
0
votes
1answer
78 views

Measure part length of polygon using QGIS

I have a polygon file of area boundaries and I want to measure part of the polygon lines in each area which next to the sea. Is there a way to do this? In theory I guess I could edit and make ...
3
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0answers
34 views

Find distance between multiple discrete sets of points QGIS3.8

No similar question seems to relate to my issue but I desperately need help with calculating distances. I have a CSV with the residential postcode of 200 000 patients. For each patient, I also have ...
1
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3answers
157 views

How to find errors (gaps and overlaps) in a line feature class in ArcMap

I have a line feature class that contains roads that were manually edited. Now I want to check if all road crossings have been edited correctly. I want to check that there is no small gap or overlap (&...
1
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1answer
460 views

Big polyline with Leaflet

I'm using Leaflet for a project where I track the path of an entity along the map in realtime. I made a buffer with the last 1000 points but it is visible only through a big zooming cause the points ...
3
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0answers
205 views

Animating lines in QGIS

I am trying to set up an animation showing lines which represent erosion contours moving back. Effectively the animation will show 1 whole line then the next line then the next line etc. for about 20 ...
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0answers
58 views

Create cross sections equally spaced in a poly line imported from QGIS to MATLAB?

I had to create an Excel sheet with each profile cross-section which gave me the coordinates and elevations from a poly line of 2300 m length, referenced from 5 different DGM, which composed the study ...
6
votes
1answer
106 views

Merge/join only the lines which are snapped to vertices in QGIS

I have polygons drawn with AutoCAD as Mline (Multiline type) which are rendered in QGIS as 8 segments for each feature. An example of one selected feature is shown in the picture below: I want to ...
0
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0answers
34 views

Draw (extend) a straight line from points

Is there any existent tool or workflow to generate a straight line in ArcMap? I have a lot of point that represent plant counting (one point per plant) and I need to generate e line that represents ...
2
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0answers
82 views

Snapping line layer to line layer

I'm working on a project where I need to snap an existing line layer to a different line layer. These lines represent streams and rivers. I'm working within QGIS Maderia 3.4 LTR. I've tried using the ...
3
votes
1answer
355 views

Creating a Line feature in PyQGIS QGIS 3.x

In QGIS GUI, a line feature is created from this icon 1.jpg How to Create a line with a fixed distance from a vector layer in python console. This my example: from qgis.core import * from qgis....

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