# Tagged Questions

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

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### Create point on a line with given distance from end in PostGIS

Does anyone know how to create points along a line (MultiLineString geometry) with a given distance in PostGIS? I'd like to create points at a regular distance over a line, which represents a ...
235 views

### Routing problem finding shortest route to line

inspiration on how to solve this problem. (Ascii art, I don't have points to insert picture) I need to find Z Z = Shortest route from X Using Road (no point exists here) O = The points that makes ...
212 views

### How to Create in Route Event layer with Right Angle?

I have collected GPS points along the road. and got Right angle Tape measurements of Boundary walls and other objects from that respective points. I have those records in Excel Sheet and GPS ...
16 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 ...
61 views

### Geocoding Street Segments Based on Extents in ArcGIS for Desktop?

I have a list of projects that need to be geocoded or drawn through some sort of automated process in ArcGIS 10.3 for Desktop. The are listed by primary street, a begin street intersection, and an end ...
136 views

### How to get polygon distance from a route?

I need to calculate the location of polygons along the route in ArcGIS (ArcInfo) 9 or 10. What I have already found out is only the calculation of the start and end of the intersection of a polygon ...
96 views

### Linear Reference initial datasets

I am trying to work with Linear Reference system as I found It in ArcGis website: http://resources.arcgis.com/en/help/main/10.1/index.html#//003m00000002000000 But I'm losing something in the ...
287 views

### Using M 'Measure' value in SQL Server 2008

MS Sql Server 2008 geometry type supports adding Z and M values to geometry objects, including linestrings. However, I cannot find any way to make use of these values, since methods such as ...
59 views

### ArcGIS Linear Referencing successive overlay operations

I have 8 tables with RouteID, BeginMeasure and EndMeasure. I want to successively overlay them starting with the first two and then overlaying the result and the next table then the result of that ...
140 views

### Best method to find routes from a set of points

I have lines table (postgis enabled database) representing the streets. I have collected few gps points along a route and I would like to match it with the streets in order. Scenario - I am jogging ...
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### creating shortest route using line segment layer as network locations

Using Arc10.2.1, trying to create a truck route that begins at one location on a county street grid and ends up in the same place, obeying a feature class of guard rail line segments throughout an ...
91 views

### How to locate events at intersections using linear referencing?

I am having problem in locating intersection crashes. Actually I have intersecting legs with their specified begin and end mileposts. I am trying to locate crashes based on the milepost values. ...
33 views

### Finding measurements of unknown points relative to reference points with known lat, long and measurements?

I am trying to measurements of the distance of multiple points relative to reference points of known latitude, longitude and measurements along a river. Is there tool that can do this? Would ...
849 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 ...
210 views

### ArcPy QueryPointAndDistance: Incorrect Lengths?

Background: I'm currently trying to determine the chainage (distance m) of my points along a polyline (i.e. proposed railway alignment). A colleague within my firm assisted me with the following ...
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### PyQGIS: standard and advanced linear referencing possibilities

I'm aware of the existence of the following QGIS plugins: QChainage Event layer linear referencing LRS Although, all of these tools offer some linear referencing capabilities, I find that they ...
339 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 ...
47 views

### ArcMap, Network analyst data preparation

I have line feature class with pedestrian network ... and information about network parameters (surface type, surface quality, slope, etc. ... not in digital form now). I want to create network ...
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### Make Route Event Layer snaps event points to vertexes?

In ArcMap 10.2.1 I have made a route event layer using the geoprocessing tool in the normal way, trying to add equidistant route events along a route every 1.6 meters. This works fine in all the ...
169 views

### Creating Route events in ArcGIS

In ArcGIS I have a set of routes, some of whose direction I change using the flip edit so that they are in the direction I require. I am able to make route event layers. However, why is it that after ...
109 views

### Linear Referencing along a polyline

I'm trying to use the "Locate Features along Routes." I have a simple polyline and I have an excel sheet of To and From miles. The excel sheet has no X&Y coordinates. The excel sheet has the ...
84 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 ...
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### PostGIS: How to distinguish overlapping routes (i.e., LineStrings) based on their direction?

I have a set of routes which are represented by LineStrings in my PostGIS database. These routes represent journeys that people make. I want to come up with routes that (a) overlap, and (b) have the ...
88 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 ...
165 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 ...
19 views

### Help with Modelbuilder workflow

I am new to ModelBuilder and am working on a project to teach myself how to use it for graduate research. A friend of mine recommended it to me since he was doing something similar in class. I am ...
42 views

### Offsetting points from lines using SQL Server Spatial?

I'm new with SQL spatial data processing, so I'm not sure how to solve my task. I have two tables - table with lines and table with points that are located on lines. Lines and points are related by ID ...
137 views

### Find the point distance along a streams polyline?

Working in ArcGIS. I am looking for a way to find the distance of a point along a streams polyline. I read Finding distance of point along polyline? and it seems to be similar to what I need...the ...
33 views

### Creating a reference line among LiDAR points and retrieving distances between them?

I have a LAS dataset which contains points with x and y coordinates. For further analysis I need a new dimension which can be adjusted as the dataset requires. To make it understandable I made this ...
27 views

### Shapely's object.project method dealing with overlapping polyline

So I am interested in knowing how far along a polyline a given point sits. Python's shapely package has a method to do such a thing, see the below code: from shapely.geometry import LineString ip = ...
81 views

### Dynamic segmentation with respect to a control factor

Is there a way either with python scripts or other solution to dynamically segment a table with linear measures (from-to fields) Each segmented section (from-to) should have all the item numbers ...
108 views

### How can I extract the measurelength, highmeasure and lowmeasure of routes in ArcGIS

I'm trying to create road Routes in ArcGIS, which traditionally have been created using workstation. I've managed to write a Python script to do this, however, unlike ArcInfo, the attributes ...
24 views

### Is there a tool to split self-created measurement values?

Is there any way to split created measurement values across multiple polylines? For example, if there are two lines that each have F_MEAS=0 and T_MEAS=0.5, is there any way to choose both edges, say ...
110 views

### Query Data from an Event Table in ArcGIS (Linear Referencing)

My goal is to store a bunch of past present and future Events in a central place from different vehicles, query those tables on demand and display the result in ArcMap. Note that right now, my Route ...
137 views

### How to locate M values in ArcGIS Silverlight API?

I am trying to work with M values in the Silverlight API. I gather that the IdentifyParameters would be used to identify a milepost by clicking along the line, but what would I use to query an M ...
76 views

### Linear referencing in Geographic Coordinate System (GCS) using ArcGIS for Desktop?

I want to make a new line segment in event table with linear referencing ArcGIS 10.2 for Desktop. I'm using two tools: Create Route with input line feature in Geographic coordinates system and ...
21 views

### Creating points at specified distances along line radiating from midpoint of each line using ArcGIS for Desktop?

I want to create points at specified distances (i.e. every 10 meters) along a line radiating from the midpoint of each line. While I could manually create a number of 'buffers' from each mid-point ...
46 views

### Find nearest upstream sensor to Event data

I am a newbie to ArcGis. I am trying to find out the nearest upstream sensor to an accident data table . The inputs that I have are: Sensor details: Latitude, Longitude, Road Name, Road Direction ...
62 views

### Interpolate missing M values along a line

Is there some way in PostGIS to interpolate missing M coordinates in a geometry like this? select ST_MakeLine(ARRAY[ ST_MakePointM (0, 1, 10), ST_MakePoint (0, 2), ST_MakePoint (0, ...
37 views

### Locating Multiple Points on Mutlipes routes by a Unique ID

I'm trying to get a "MEASURE" for Points along a route. I need ARCGIS10 Desktop Linear Referencing tools or other application to use a unique identifier to match the Lines in the route to points ...
23 views

### Selection Based on Range of Values from another table

I'll try to explain this is as simply as possible. I've figured out how to create this table in SQL, no problem. But I'd like to have this done in python as part of a larger model. I have a feature ...
48 views

### Measuring distance on line geometry with ArcGIS IOS

I'm developing an IOS application which should run offline and need a feature; I want to be able to calculate distance to a point from the start of a given line geometry. With ...
159 views

### Locate features along routes when features are parallel

I am trying to use Esri's Linear Referencing Tool to conform a drawn line to a road route. I have a fairly large search radius of 20m. As long as the line I draw touches the route at some point, ...
112 views

### SQL Spatial Tools package - linear referencing

The SQLSpatialTools package website seems to be temporarily down, so I cannot access the article on linear referencing tool posted there at the moment. Is it possible, by any other means, to obtain a ...
107 views

### How to publish linear referencing capability in ArcGIS for server?

I created a linear referencing event and want to publish as linear referencing service in ArcGIS for server . The problem is when i want to publish, High warning shows the linear referencing event ...
83 views

### Object: Createobject Layer Invalid Data Source

I'm using a tool made for ArcGIS, however I keep getting this error (see picture). I do not know any python code and I'm trying to get this script to run. # Import system modules import sys, ...