High Quality Content by WIKIPEDIA articles! Observations and Measurements (O M) is an International Standard which defines a conceptual schema encoding for observations, and for features involved in sampling when making observations. While the O M standard was developed in the context of geographic information systems, the model is derived from generic patterns proposed by Fowler and Odell, and is not limited to spatial information. O M is one of the core standards in the OGC Sensor Web Enablement suite, providing the response model for Sensor Observation Service (SOS).