Polar Orbit vs Sun Synchronous Orbit - GIS Geography
Polar Orbits
Types of Orbit
Weather satellite orbits — Science Learning Hub
Geo-stationary and polar satellite
Polar Orbit (PO) - AcqNotes
Analysis of an Observing System Experiment for the Joint Polar Satellite System in: Bulletin of the American Meteorological Society Volume 97 Issue 8 (2016)