# Tagged Questions

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

23k 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 ...
18k views

### Creating point file along line (trail) at regular distances (0.20 miles) using ArcGIS Desktop?

I'm using ArcGIS 10.1. I have a trail network that I'm trying to establish signs along the trails every 0.20 miles. Is there a way to create the point file from the line feature?
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### 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 ...
445 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 ...
5k 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 ...
2k 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 ...
484 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 ...
2k views

### Counting points along polyline at given distance of every 40 Ft using ArcMap?

I've got a polyline representing a pipeline and have a pig run that has metal loss. I am going to create a points shapefile in ArcMap 9.3.1 of the metal loss locations along the pipeline but want to ...
2k 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 ...
2k 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 ...
5k 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 ...
222 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 ...
478 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 ...
951 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 ...
3k 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 ...
2k 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, ...
3k views

### Segment road network line shapefile into new equal length segments line shapefile?

I would like to subdivide a road network for an entire state into segments of equal length. So, Highway X would be divided into 0.5 mile segments, with a record for each segment, and Highway Y would ...
3k 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 ...
923 views

### How to use the linear referencing plugin from QGIS with postGIS data?

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 ...
551 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 ...
432 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 ...
829 views

### Calibrating routes gives interpolation error in ArcGIS Desktop?

I know that copy a question is not exactly great way to ask on this forum, but my situation is exactly the same as this unresolved issue on the (closed) ESRI forum: I have a stream centreline (...
399 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 ...
334 views

### Arcpy: Names and distances of nearest intersecting roads in layer 1 to end points of a road segment from layer 2

As shown in the image below, I'd like to return a new field in layer 2 that for each segment stores a string:"Road C, 1 km from Road A to 0.5km From Road B". Calculation of the distances could be ...
1k 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 ...
1k 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 ...
242 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 ...
181 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. ...
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### What is the level of error I should expect when using a NAD StatePlane CRS from an adjacent state?

I am adding Georgia data to my GIS database and, unlike the California data I've added, have decided to use my existing EPSG:3361 (South Carolina StatePlane) coordinate reference system for ...
155 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 ...
770 views

### How to find Chainage of points using QGIS

I have two types of Road shape files. Road (Polyline) and important points (waypoints) along the road. Both of these shape files are prepared using GPS. I want to find the chainage of the points. Is ...
65 views

### Saving a calibrated route in QGIS for “future” use

Can a Calibrated Vector (after using LRS) be saved with M values, so that the file does not have to be calibrated every time is used? We're currently working on State road data, and it has many ...
68 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 ...
213 views

### Intersecting overlapping polylines using ArcGIS for Desktop?

I have 4 multipart polyline shapefiles (download a sample dataset here). The geometries are identical, except for the length of segments in each shapefile. They represent 4 variables describing an ...
574 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. ...
444 views

### Generating random points on a route

I am trying to generate random points on a route from one point to another. What I have till now is, given a source and a destination, I can get a route using Google's API. But how do I get the ...
1k views

### Calculating the distance between points and multiple lines?

I have a point shapefile of about 100 points and a polyline shapefile of about 200 lines and I am interested in finding the distance between every point and each individual polyline. My polyline ...
1k 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 ...
1k views

### How to preserve original direction of NHD segments when creating route using 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. ...
593 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 ...
58 views

### Calculate Statistics along a Linear Feature

I have a linear feature class (road network) that is split into segments less than 2 miles in length. Each segment is assigned a value. I want to calculate a distance weighted sum in some manner such ...
554 views

### Assigning RouteIDs to polyline feature class in ArcGIS Linear referencing?

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 currently....
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### Dynamic Linear Referencing of events in QGIS from Excel or CSV using virtual layer

I have a PostGIS table with a geometry type LINESTRING M to represent routes. Here is the table specification: CREATE TABLE routes ( fid serial PRIMARY KEY, r_name text NOT NULL, geom geometry(...
68 views

### Create chainage points from hatch in ArcGIS

I have routes representing road centrelines created my geodatabase. I have hatched these features with point symbols and lables every 100m as shown below: I would like to create a point feature ...
418 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 ...
3k 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 ...
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 ...
360 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 ...