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

learn more… | top users | synonyms

3
votes
1answer
850 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 ...
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
223 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 ...
2
votes
2answers
454 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 ...
6
votes
1answer
285 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 ...
0
votes
2answers
234 views

How to create a route and add that route as layer to map using ArcPy?

I wrote a little script for ArcGis, and when I make it run by GUI it happens that it seems to create routes but the routes do not appear in the TOC. Consequently, when the script tries to execute ...
10
votes
2answers
735 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 ...
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 ...
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 ...
4
votes
1answer
149 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. ...
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 ...
6
votes
2answers
623 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 ...
4
votes
4answers
225 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 ...
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
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 ...
12
votes
1answer
397 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 ...
3
votes
2answers
443 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
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 ...
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
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 ...
3
votes
3answers
850 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. ...
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 ...
3
votes
3answers
413 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 ...
11
votes
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 ...
6
votes
1answer
434 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 ...
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 ...
2
votes
2answers
507 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 ...