Uses rods and cones to capture electro magnetic waves Passive Remote Sensor Invented in 1975, it uses a charge coupled device to capture images The earliest non-biological remote sensing device -- first mentioned in China between 390 and 470 BC Active Remote Sensor 1. The Human Eye 2. Camera Obscura 3. Digital Camera 4. Landsat Satellite 5. Shuttle Radar Topography Mission (SRTM)