Measures and Linear Reference Systems

A Linear Reference System (LRS) is used to store locations relative to their positions along a linear feature that has measures. Measure distances are then used to identify the location of these points or lines along the linear feature, rather than using X,Y values. Rather than rely on calculating the length of the (possibly simplified) geometries, a measure (m) value is stored on each vertex of the line to store the real-world distance.

1Integrate can read and write data from Data Stores that have LRS measures stored on line geometries as a third ordinate (M).

For information on which Data Stores support measures, please refer to your chosen Data Store.

Built-ins Using Measures

There are a number of specific Built-in functions that use measures. Typical use cases are:

• Generating a point geometry or line geometry for an asset which uses Linear Referencing. This can include a start measure and optionally (for a line) an end measure along it.

• Generate a measure distance along an LRS line from a geometry.

• Validating measures, e.g. measure distance is not off the end of the referenced line.