Geographic Information Systems

Questions tagged [linear-referencing]

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Linear referencing is the method of storing geographic locations by using relative positions along a measured linear feature.

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45 views

Creating linear event table from geometry using QGIS Linear Referencing

I am trying to find a way to dynamically create an event table from a linear feature. Imagine the example below. Registration of a sidewalk/fence or similar. The colours represent different routes. ...
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2answers
41 views

How to create a line feature which contains the overlying polygon attributes?

I have a road network Shapefile which intersects a polygon feature class. I need to create a excel table which contains the road number, the attribute from the intersecting polygon feature class and ...
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0answers
27 views

Handling events that cross more than one route using Linear Referencing of QGIS

I am working on implementing linear referencing. How would you deal with the situation below? Where an event is stretched across two or more "routes". At the moment I am playing around with the ...
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0answers
40 views

Trying to understand QGIS LRS plugin - How to implement?

I have been trying to understand how to implement the LRS plugin but there are many things that does not "click" in my head. Not sure if it is the terminology or the process i dont understand, please ...
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0answers
9 views

Route Events Not Updating

I have created a route events point field based on a table. When using version 10.2 on a previous computer, the route events would update when the values in the table were changed. You would ...
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0answers
14 views

Locate features along routes: measurement unit output?

I am using ArcMap version 10.3.1: I have a polyline (also converted to a route feature) and points layer. All points lie on the line. I want to calculate the distance each point is from either the ...
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9 views

LRS plugin dropdown selections not working

I have just loaded the LRS plugin but when I try to access the layer with measures drop down selections on the measure tab they are not working. Calibration drop downs work and so to do the layer ...
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0answers
18 views

Get the measure M along a CircularStringM in PostGIS without first converting to a LineStringM

I've been struggling to get PostGIS 2.5 to run any linear referencing functions on geometry containing curves (CircularStringM, CompoundCurveM for example). Is it possible to get the measure M along ...
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1answer
124 views

Linear referencing using QGIS only

I would like to do some basic linear referencing (label the distance along a line every 1000 m e.g.) without using plugins or PostGIS or creating points along the line. I tried working with ...
2
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1answer
66 views

Find order of points along polyline

I have a points layer with random points located along a route (polyline layer). I was wondering if there is a simple way to give a sequence number to each point in the order they show up along the ...
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0answers
22 views

Importing 3D DXF and using LRS

I've got a dxf in AutoCAD with a different Z value in each vertex. I'm importing this dxf to QGIS and running the LRS plugin to work with some chainages. My problem is that when running the chainage ...
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13 views

FeatureClass in Pipeline Referencing FeatureDataset created with ArcGIS Pro is read-only from ArcMap

I created a Pipeline Referencing Feature dataset, and inside it is created a Point Feature class, I did that using ArcGIS Pro. when I try to access the information from ArcMap, I am able to load the ...
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1answer
35 views

Create routes when the measure source is not “length”?

I need to do some linear referencing work with a network of lines with specific beginning and endpoints. The first step is to take the network of lines and use the geoprocessing tool "Create Routes" ...
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1answer
80 views

Locating features along route in QGIS?

I have a polyline and points layer. The points lie on both sides of the polyline at some distance. I want to calculate the minimum distance between all the individual points and the polyline. I can ...
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96 views

Making route event layer in QGIS?

In my situation: I have a CSV file with information about specific road segments: Road number, start kilometer, end kilometer. And I have road shapefile with Road numbers. The task is to create a ...
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1answer
34 views

Linear referencing - Make Route event layer: wrong spacing of points along route?

I want to simulate the ArcGis tool Generate points along line with linear referencing tools (we don't have the licence for the former). Our methodology is to create/use a line create an excel table ...
2
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1answer
51 views

Finding points along lines, given lengths along those lines, using QGIS?

I have one layer with a network of lines and a second layer with its associated line and its distance along that line. Is there a way to generate points for all these rows along their associated ...
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1answer
28 views

“Locate features along routes” tool and line features - how to use XY tolerance?

I am trying to use the "locate features along routes" tool to map guardrails to a route, but I'm seeing some very strange behavior. As a test case, I'm selecting a single guardrail (pictured) that is ...
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0answers
46 views

Reducing excessive segmentation from Linear Referencing? [closed]

Can anyone suggest a resource which discusses different approaches to cleaning up linearly references events in order to minimize the occurrence of small dynamic segments? I'm working with many ...
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1answer
71 views

Changing kilometer to lat/long in roads using QGIS?

I have accident data that I take them from the police station, unfortunately, they save accident point as a kilometer from that police station instead of lat/long. also, I am working with QGIS, now I ...
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0answers
82 views

How is the LRS ArcGIS Measure Along a Line implemented?

I'm trying to replicate a nasty corner case in a LRS implementation that doesn't agree with ArcMAP measure tool. I've tried measuring distance in its native shp coordinate system NAD83 (27916) to no ...
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0answers
36 views

Route numbers changed by QChainage

I am a fairly new user of QGIS 3.6: I have a river system consisting of a main stem and several tributaries. In preparation for using LRS (to create 'events from an XL table with chainages), I first ...
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1answer
104 views

Display route Events option in ArcGIS Pro

In ArcMap you can add event table and route reference feature class and when you right click on event table there is an option display route events. I am struggling to find that option in ArcGIS Pro. ...
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58 views

Mapping objects/assets along polygon line using ArcGIS Pro?

I am working with an open rail data set which is imported to my ArcGIS Pro project. The rail data is loaded to ArcGIS as a shapefile and includes kilometer notation for a specific rail segment. The km ...
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37 views

Segmentation of a line based on several overlapping lines within the first line

I stumbled over a problem which I can't figure out myself so maybe you can help me.. I have a line going from 0 to 100% of its length. On this line I have 1:n lines with different information and ...
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83 views

Creating points with linear referencing

I have traffic data that shows tracks that have start and end times (in YYYYMMDD-HHMMSS format) and the speed (m/s) the vehicle was moving. From that I've calculated total traveled distance (m) and ...
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196 views

ArcGIS Make Route Event Layer, “ROUTE NOT FOUND” is output

I have a polyline shapefile that's about 200,000 meters long, and I am trying to get xy coordinates for specific distances along the line. The polyline shapefile is in UTM coordinates. I ran the ...
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1answer
171 views

Generating Points Along Line at irregular intervals using ArcGIS Desktop?

What tool do I use to generate points along a line from an input list of lengths? For example: Length_km 0.12 0.2 0.38 etc. ArcPy solutions are okay. I tried: testOut = outpath + '\\' + '...
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5answers
116 views

Use of linear referencing on a route that span over 3 different UTM zones

I have a long route (~2400 KM) that span 3 different UTM zones. (N - 37, 38, 39) On this route there is a sign every 1 km-approximately (km marker), these signs help in determining the exact location ...
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1answer
137 views

Using ArcGIS JavaScript to calculate length of line feature where clicked

I am working with arcgis JavaScript API and a linear referencing feature. I want to be able to click on a line of a feature and calculate the length from beginning of the line to where I clicked. Then ...
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1answer
34 views

Using dBase table converted from CSV to Make Route Event Layer?

I'm using the tool 'Make Route Event Layer' and I need to use a dBase table for the event table, but the data are saved in a CSV file. When I try with dBase table that I created myself all go good, ...
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1answer
106 views

Splitting line into segments of different length with ArcGIS Desktop?

I have a river network and I have to split each river into transects of different length. The distances where the lines have to be split are in an excel sheet. For example I have to split the river 1 ...
2
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1answer
221 views

Route event layer failing to draw all features

I am encountering some unexpected behaviour in attempting to use linear referencing tools to produce a route event layer for a road network. I have produced a polyline route shapefile from a ...
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0answers
30 views

Layers Created from table not saving?

I'm new to QGIS. I have imported a shapefile for a road network. I have then imported a table containing condition data about the network. I have used the LRS plugin and the data displays perfectly ...
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0answers
55 views

Select events that represent the most recent work on roads

I have a question on Stack Overflow where I ask about Selecting events that represent the most recent work on roads. So far, I have been provided an answer that seems to work, although it is quite ...
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1answer
28 views

Creating PolylineZM from Points using ArcGIS Desktop?

I have a point feature class that is essentially hundreds of vertices along a single line. The Attribute Table contains MD (Measured Depth) values, XY fields of each point feature, and a ID field for ...
2
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0answers
52 views

Software support for GML 3.3 Linear Referencing?

Are you aware of any software supporting import/export of Linear Referencing data in GML version 3.3 format? Apparently no software application, proprietary or FOSS, currently supports it explicitly. ...
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1answer
85 views

positionAlongLine() does not give equal distances on curve using ArcPy?

I'm trying to use positionAlongLine() to create equally spaced points down a polyline as part of a loop. I also need to calculate the distance at the same time. However, on curves there is a mismatch ...
2
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2answers
2k views

Calculate distance to points along line in ArcMap?

I have two shapefiles: a series of points and a polyline created from the points with the tool Points to Line. Both shapefiles have the same projected coordinate system with a linear unit in metres. ...
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1answer
448 views

Adding m value to points using ArcMap? [closed]

I have used Points to line to create a polyline from a series of points. I want the points to have attributes with m values corresponding to the distance from the start of the line. There is also a ...
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1answer
133 views

Using Tissot's Indicatrix Validate Conversion to ECEF

When using NED & ECEF as CRS: https://www.mathworks.com/help/map/ref/ned2ecef.html?requestedDomain=true Am I should worry from getting 'classical' projection issues? For example when x,y are ...
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0answers
46 views

POSTGIS: lwgeom_clip_to_ordinate_range clipping routine returned NULL

I'm trying to do linear referencing with st_locatebetween. In the past everything went well. But from now on, i get following issue: lwgeom_clip_to_ordinate_range clipping routine returned NULL ...
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0answers
120 views

Linear referencing route events for trajectory data

I am trying to show route events for depths with trajectory data. The depth data has both positive and negative values (starts 50m above sea level and ends km's below the sea level). The below process ...
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0answers
126 views

LRS plugin does not return measure field.

Does anyone know how to use the LRS plugin in QGIS 2.18.14? I have a layer of roads and points I need to determine the distance along the roads. I tried but I can not get a measure field. Does ...
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1answer
553 views

Plotting points along line at specific distance value using PyQGIS?

I'm trying to figure out a way to plot points along a polyline at distances that I have in a .csv file (not a point layer with valid lat/long). There seem to be quite a few ways to create points ...
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0answers
49 views

StoryMap : following a path not a location point

I am looking for a way to make a storymap with StoryMap JS (Knight Lab) or any other Opensource solution, where it can focus on a Path (a part of a waypoint), and still have the link with the text ...
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1answer
133 views

Linear Referencing Complex Intersections/Road Segments

What is the proper way to handle complex/branching intersections in linear referencing? I have a road shapefile I was going to linear reference, but I have some segments that are very complex. I have ...
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2answers
167 views

Route Events Won't Interpolate Z Values On 3D Route?

I am trying to interpolate z values based on the example provided in this post on geonet. In it she has a set of know x,y,z locations that she turns into a Polyline Z and converts to a route (...
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1answer
54 views

New route events based on existing route events' locations/values

The goal is continuous values along a line based on known values of certain segments along the line. I was pointed towards linear referencing an an approach, so am currently trying to derive the ...
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1answer
506 views

Finding upstream and downstream distance between points along river network polyline

I have a network of polylines making up a stream network (from the National Hydrology Dataset). I also have 2 point files: one of areas of interest and another of locations of dams within the network. ...

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