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

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12
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1answer
396 views

How to maintain integrity between changing street network and geocoded points?

We maintain hundreds of thousands of points geocoded against a dual-centerline Navteq street network. We are faced with the challenge of maintaining referential integrity between our points and the ...
11
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5answers
14k views

Finding distance of point along polyline?

We need to find the distance of a series of point along a given polyline. We have a polyline dataset repsenting rivers in a catchment, broken up into river reaches (FID 1 through 35 for example). We ...
10
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2answers
719 views

What is an “XYZM” measurement model?

SpatiaLite supports a remarkable number of different dimension models. Interestingly, some of their values support a "measure" coordinate (XYM, XYZM). How would this measure-coordinate be used, and ...
8
votes
6answers
3k views

Get a point on a polyline from end points given distance along poly line

I have start point and end point of a polyline. How can I get a point on that polyline from end points specified by the given distance. How can I get this by using arcpy provided that this script ...
8
votes
2answers
254 views

ArcGIS 10: Create an event linear layer from a point layer based on directionality

I have a point layer that reflects the speed limits and a line layer of the roads. The location of the speed sign indicates in which direction the speed limit applies. How can I make linear event ...
7
votes
2answers
1k views

For a given feature find the closest point along a given path

Looking for a Java based (foss4g) solution for the following: I am using a path along with a buffer to find features that are along the path. For each of the features returned I want to find the ...
7
votes
1answer
77 views

Adding Route Shapefile (PolylineM) to QGIS?

I'm new to QGIS (and to this amazing forum as well) and I already have an issue : I received a Route Layer in SHP format (PolylineM). I've easily loaded this file into QGIS but it doesn't seem to ...
7
votes
2answers
1k views

Finding the distance between points along a river (Linear referencing)

I am new to gis and am struck. I have a network of rivers which is made up of small linestrings (polylines). In a different shapefile, i have locations of several stations on a river. I need to find ...
6
votes
2answers
618 views

Which Open Source GIS application support Linear Referencing and Dynamic Segmentation?

I'm looking for an Open Source GIS application that supports Linear Referencing and Dynamic Segmentation for the development of a road inventory system. I already know about GRASS but I'd like to know ...
6
votes
1answer
4k views

How to create a point along a line given distance

I have been given a non-spatial database which contains the names of lines which I have a shapefile for. The database also has names of points and the distance of each point from the origin along the ...
6
votes
4answers
2k views

How to interpolate points along a line in Python for ArcGIS 9.3?

I am building a Python geoprocessing script for ArcGIS 9.3. In the script, I have a simple LINE feature class with one row, one line. How can I use a linear referencing system to interpolate a point ...
6
votes
1answer
278 views

NYC Subway Line Station Order?

I've currently got data on the NYC subway stations (including name, position, and how many people entered and existed during a timeframe). Also, I have the data on which stations have which train ...
6
votes
1answer
398 views

Near tool producing odd results for batch-snapping; how to best perform batch-snapping?

I am trying to use the Near tool in Arc10 as described in Snapping points to a line using ArcGIS geoprocessing tools for the purposes of batch-snapping a feature class of points to a feature class of ...
6
votes
1answer
433 views

How to store historical versions of road (route) portions?

Part of my job is to analyze certain portions of road for our clients. A client will ask, I want to look at Road A from parcel XYZ to parcel RST and Road B from parcel RST to parcel OPQ. The way I do ...
5
votes
3answers
1k views

FME - Calculate distance of point along a line

I have created an FME workspace which inputs a pipeline as well as other linear features which cross it (waterways, roads, railways, fences, other pipelines, etc). The output is a point file which ...
5
votes
1answer
124 views

Merging and joining two line feature classes while maintaining attributes from both using ArcGIS for Desktop?

I created an event layer using the MAKE ROUTE EVENT LAYER tool based on anticipated scheduled events. The road layer which is the base layer is intact. What I would like to achieve is combine layer ...
5
votes
2answers
445 views

How to divide polyline into 1-mile increments?

I have a river shapefile that I need to break up into 1-mile increments. The polyline is 53 miles in distance, so I should I have about 53 mile markers as a result. I have tried the Divide tool, ...
4
votes
4answers
224 views

Is city-supplied GIS data sufficient for transit operators or do they need their own set of GIS data?

City GIS data is usually built in a format where streets/avenues/boulevards/etc are modeled as lines that are geographically located in the middle of the streets/avenues/boulevards/etc. Is that ...
4
votes
1answer
148 views

How best to map lines based on multiple attributes?

I need to plot lines onto a map to display road quality. I'm already using colours to distinguish between different road conditions, but I also need to display another factor - the survey origin. ...
4
votes
2answers
160 views

How to identify gaps in linear point data in FME?

I have been given a spreadsheet which contains coordinates of welds along a pipeline. I'm using FME to create points from the coordinates. On average, the points are roughly 11 metres from each ...
4
votes
1answer
56 views

Why would running LocateFeautresAlongRoutes GP tool return null?

I'm currently using the LocateFeaturesAlongRoutes tool wrapper for C#/.NET for a custom tool I'm developing for ArcMap 9.3.1. I've been able to run this tool in ArcMap outside of code in a tool with ...
3
votes
2answers
440 views

Linear referencing: Assigning RouteIds to polyline feature class

I have a Linear Referencing Route System in ArcGIS Geodatabase format (polylines with M values) and a separate polyline feature class of short segments (called TMC) that do not have RouteIds ...
3
votes
3answers
839 views

How to preserve the original direction of NHD segments when creating a route using the gp.CreateRoutes_lr tool?

I am trying to figure out how to preserve the original line direction of NHD High Resolution data that I am selecting out and creating a route with. I'm using ArcGIS 9.3.1 and this is a python script. ...
3
votes
3answers
408 views

Redistribute linestring vertices to specified distance

I use a groundwater model program called GMS, and it has a very useful function "Redistribute vertices" (more info). I use this function all the time to both simplify and provide regular spacings ...
3
votes
2answers
67 views

Move points along a line, 100m left or right

In ArcMap 10, I have several hundred points taken along a zig-zag transect (line) but I need to move these points 100m to the left or right, perpendicular to the line. The points are stored as a ...
3
votes
1answer
2k views

Linear Referencing using ArcGIS v10

I'm a fairly experienced ArcGIS user, but am new to Linear Referencing. Here's my problem .... I have a road segment dataset, stored as a simple line feature class in File Geodatabase, and I have a ...
3
votes
2answers
2k views

How to get accurate mile markers from DOT ShapeFile?

I'm having trouble getting accurate mile markers through route traversal using PostGIS. Based on the discussion in Geocode from mile marker/milepost to latitude/longitude?, I downloaded Texas ...
3
votes
2answers
100 views

Linear referenced data driven pages

I am trying to create a form of data driven page that incorporates linear referencing very similar to the "Linear referencing scenarios" example: I have a map that I will display on each page that ...
3
votes
1answer
831 views

How to create perpendicular line from point on one line to an intersection with the nearest polygon layer?

I am trying to create laterals from a layer of sewer mainlines and have yet to Google a thoroughly helpful answer. Hoping to find some help here. I have a layer of mainlines that have a direction ...
3
votes
2answers
289 views

How do I snip/split polylines at chainages?

What is the best way to snip/split lines at chainages? E.g I have a csv with the uniq ID of the polyline item and a start and end chainage. I want to extract the lines between the chainages stated. ...
2
votes
1answer
48 views

Does ST_GEOMETRY support Linear Referencing

I am wondering if the ArcGIS ST_GEOMETRY provides Linear Referencing functions, such as creating a point based on a given measurement, like Oracle Spatial. I couldn't find any function like that in ...
2
votes
2answers
122 views

How to find measures of points that are close to route in ArcGIS 10.2?

What I have is a route layer of a river and points layer with associated temperature data (temperature of the river) that were collected using an airplane. The path of the points does not match the ...
2
votes
2answers
447 views

Get Point at distance on a LineString using NetTopologySuite

I am quite sure there is a function in NTS that actually gets us a point at a distance along a line starting at first vertex. I am using NetTopologySuite version 1.12.1. In Shapely, the python ...
2
votes
2answers
506 views

ArcGIS Server Object Extension for Analyzing Linearly Referenced Data

I have just begun learning about the ArcGIS Server Object Extension (SOE) capabilities, specificially with ArcGIS 10. Is there an example available of an SOE that can return information about ...
2
votes
1answer
107 views

How to access M-values in QGIS?

I am working with Linear Reference Systems and I know is very easy to get M coordinate (M-value) from a shapefile in ArcGIS. But, how to get the M-value in QGis? If you have doubts about my issue, ...
2
votes
1answer
76 views

How to get location of Milestones from Linear referenced data?

I have shapefile of highways, where each segment has the information indicating the starting mile and ending mile. Using these fields, I have created Routes, using the 'Create Route' gp tool from the ...
2
votes
2answers
60 views

How to begin creating a linear referenced gdb with NHD

Our legacy fish distribution data contains data by reaches. Reaches are arbitrary locations on streams, eg. reach 1, 2, 3. Each reach's from-to are known, but not by x,y coords. An example is 'brown ...
2
votes
1answer
67 views

How to compute the distance from the beginning of a line for every points using postgis

I have a line, for which I need to know, for every point that compose it, what is the distance from the beginning. The data is stored in PostGis 2.0 For example, for the line with the point a, b, c, ...
2
votes
0answers
30 views

What determines direction in “Hatches”?

I created a route layer that uses hatches to help determine addresses along a street centerline. About 90% of the time, the hatches go up from zero in the direction that the line was digitized but ...
2
votes
0answers
169 views

Snap points to line and calculate chainage using Open source GIS

I have a line layer (representing a pipeline) and a points layer (representing valves) and I would like to calculate the chainage of the valves along the pipeline. I assume that I would first need ...
2
votes
0answers
286 views

How to use the linear referencing plugin?

I need a guide how to use this plugin properly, I'm a newbie on PostGIS and I'm trying to use the linear referencing plugin of QGIS. I've created a database on postgreSQL with the postGIS extension ...
2
votes
0answers
58 views

Get distance after path distance allocation

I use ArcGIS 10.1 in Windows XP. I have a two point feature data sets One containing a single point P1 and another containing multiple points Pm. I computed the minimum-distance path from P1 to each ...
2
votes
0answers
112 views

Problem to transform events from one route to another

I have a road feature class layer containing parts like 1_10, 1_20. 2_10, 2_20... etc. 1_, 2_ is later used to create the route and _10, _20 is indicating the direction (the road feature classes were ...
2
votes
0answers
220 views

Linear Referencing Methods: Station Equation origins

DEAR PEOPLE FROM THE FUTURE: Here's what we've figured out so far… I am working in the pipelines field, and I get in touch with the concept of the linear referencing methods, specifically with ...
1
vote
2answers
63 views

Split lines into non-overlapping subsets based on points

Given a table with line geometry, and one or more points that are snapped to this line in a separate table, I would like to split each line with one or more intersecting points at each of the ...
1
vote
1answer
92 views

How do I create measured line segments along existing polylines from a starting point?

I realize my problem may be solved using Linear Referencing, and if that's the case I'm looking for help figuring out the workflow involved there. I'm working in ArcGIS 10.2 Desktop Basic, and this ...
1
vote
1answer
624 views

Measuring Distance from Point to Point Along a Path in ArcMap

I am looking at a village and want to find the distance from each house (point) to the pagoda (point). However, I want the distance to be measured along a path (which I digitized as a polyline) and ...
1
vote
1answer
82 views

Writing length of line along the line

I sometimes have to write out the length along a line for every couple of hundred meters or kilometers. This applies to pipes, when the construction team wants to know where along the pipe they are or ...
1
vote
1answer
290 views

Calculate distance of points along a route QGIS

I have a line layer and a point layer, I need the distance between the first and the last point measured along the line. How can I do that using QGIS? Do I need to know linear reference? I don't ...
1
vote
2answers
212 views

Postgis 2.0 - How to get a Point from given LinestringM and a measure?

If I have a cable route linear referenced and stored in a LinestringM with M value is the length (in meters) from the start of the route - for example: LINESTRING M (0 0 0, 10 0 20, 12 0 40, 20 0 50, ...