Tripod A portable, three-legged frame used as a platform for supporting the weight and maintaining the stability of some other object. Typically used as a data collection platform to which sensors are attached. Observation platform Definition adapted from Wikipedia. See http://en.wikipedia.org/wiki/Tripod ODM2 Equipment Type Controlled Vocabulary ODM2 Working Group A vocabulary for describing types of equipment used for making observations. Examples include sensors, batteries, radios, dataloggers, samplers, etc.