APPENDIX BLinear Referencing

In all the chapters of this book, we use coordinates to locate spatial objects on the surface of the earth. Coordinates locate objects in a two-dimensional space, such as longitude and latitude. As you saw in Chapter 4, a large number of different coordinate systems can be used in this way. They are all defined as spatial reference systems.

Spatial coordinates are not the only way to locate objects. Some objects are better identified by their position along a linear feature: their location can be described by a measure value (such as travel distance) with respect to some known point on the feature (such as its start point). This type of location referencing using a measure value (instead of the latitude/longitude ...

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