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TSPI
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[photogrammetry, measurement]
Acronym for time-space-position-information. The position and attitude information provided about an airborne or space-based platform by the onboard use of an Inertial Measurement Unit (IMU) integrated with a Global Positioning System (GPS) and potentially other sensors and computational algorithms. Commonly used to provide the exterior orientation of a remote sensor, either in real time or as a post-processed result.