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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15 views

Seeking Linear Referencing Tutorial in QGIS? [on hold]

I'm looking for a tutorial on how to create routes using the LRS Plugin for QGIS. There are several web pages that specify what each tab and field mean, which is helpful of course, but I can't seem to ...
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28 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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18 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 ...
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1answer
45 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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20 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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30 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
58 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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58 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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19 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
32 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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36 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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35 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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62 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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105 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
116 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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46 views

Is there a way to linear reference a line in QGis [duplicate]

Iv'e seen a number of plugin's that do things like create grids of points and such like, but what I need to do ideally is to create a line of points that follows a line geometry, and then drop those ...
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5answers
98 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
94 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
31 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
73 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
117 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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29 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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53 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
27 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 ...
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50 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
68 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 ...
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2answers
983 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
223 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
110 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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39 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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92 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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92 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
458 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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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
108 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
134 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
51 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
413 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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1answer
258 views

MakeRouteEventLayer_lr Vs Display Route Events

I've two script tools. The first one prepares data for the second script to work. The first tool routes a table along a line using MakeRouteEventLayer_lr. The second script tool reads the selection ...
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35 views

How to calibrate/put points on a network

I would like to staled points on a network. I have shape-point and I would like to take them and put/position them to position correctly on the network. I think it's easy but I'm lost
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1answer
132 views

Finding distance from river outlet to points, following river, using ArcGIS Desktop?

I have a line (the river (in blue)) and a shapefile of points (plants colonies (in orange)) and I need to find the distance between the river outlet and many points along the river instead of "as the ...
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0answers
95 views

Automation Error while running Geoprocessing tool using VBA in ArcMap?

I am trying to run a geoprocessing tool in ArcGIS 10.2 as a part of a VBA GUI (kind of) that I'm trying to create - unfortunately it gives me an automation error. I'm new to VBA and ArcGIS. The ...
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1answer
580 views

QGIS 2.14.14 Essen LRS Error “TypeError: object of type 'NoneType' has no len()”

I have recently installed the Essen version of QGIS and I am having difficulty running a query I have ran without problem on previous versions of QGIS. I want to provide 'measurement' data to a ...
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2answers
131 views

calculate distance of points from reference points along a line

I have a points layer and a multi-part non-overlapping line layer (a line divided into segments). All the points fall exactly on the line. I have the coordinates of the start and endpoint of each ...
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1answer
42 views

What geoprocessing tool to use for analysis of multiple line feature classes?

I have many line feature classes that I am trying to use in an analysis. For sake of the question I will just use a basic example. I have a line feature class of State Roads for the state of Florida....
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663 views

Perform Calculations in Cartesian Frame (NED/ECEF) Vs. Geodetic Frame

I'm recording robot's path (using INS) in Cartesian frame coordinates (x,y,z) relative to origin point. So essentially I've created NED coordinate system. Origin point has exact (in advance measured) ...
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36 views

Is there an established method to declare “Forward” on a linear feature

Is there an accepted way to establish a Forward direction for a linear feature regardless of the ordering of the points used to store the feature? An example would come from Roadway Design in the ...
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84 views

QGIS virtual layer: Linear referencing result with gaps

I have a layer with some roads, and a table, with information of whether the road is paved or unpaved. The table contains linear referencing measurements from (vanpos) - to (totpos). I'm using a ...
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91 views

QGIS and LRS. Define points along line from distance in .txt file

I'm working with QGIS 2.14.3. and am a fairly novice user. I have a shapefile layer with polylines, each line is identified by a unique 'LCS_CODE' field. In a spreadsheet (imported as a text file ...
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1answer
153 views

Query M value where point intersects route in ArcGIS?

Is there a way I can query the M value along my route where a point touches the line. I'd like to use the field calculator in my Points fc to query the M value where the point intersects the line and ...

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