SRTM Shuttle Radar Topography Mission
Remote Sensing

SRTM Shuttle Radar Topography Mission

During an 11-day mission, Space Shuttle Radar Topography (SRTM) mission captured Earth’s elevation at 1 arc-second (30 meters) for over 80% of the Earth.

polar orbits
Remote Sensing

Polar Orbit vs Sun Synchronous Orbit

A polar orbit satellite travels pole-to-pole. For a sun-synchronous orbit, it passes over any given point on Earth’s surface at the same local solar time.

Remote Sensing

Geosynchronous vs Geostationary Orbits

While geosynchronous satellites can have any inclination, the key difference is that satellites in geostationary orbit lie on the same plane as the equator.

Free Satellite Imagery
Data Sources

15 Free Satellite Imagery Data Sources

If you want free satellite imagery, there’s no better way to do it then follow this incredibly useful guide. We rank the best sources of free satellite data.