This document discusses using RESTdesc to enable automated composition of sensor web APIs. RESTdesc can be used to describe the functionality of web APIs for sensors like temperature, location, and pressure sensors. These descriptions are modeled as rules that can be chained together using semantic web reasoning. The author has tested this approach and found that RESTdesc composition scales well, with chains of over 500 APIs completing in under 2 seconds. This allows for automated composition of sensor web APIs to answer complex queries.