active cavity radiometer irradiance monitor satellite biosphere calipso california institute of technology china-brazil earth resources satellite program cloudsat defense meteorological satellite program disaster monitoring constellation earth observing system earth observation satellite envisat european remote-sensing satellite fengyun fourier transform spectroscopy geostationary operational environmental satellite gravity recovery and climate experiment hydros icesat ikonos infrared jet propulsion laboratory landsat program metop meteosat multi-functional transport satellite nasa npoess new millennium program nimbus program orbiting carbon observatory polar orbit project vanguard quickbird quikscat remote sensing seasat seawifs solar radiation and climate experiment stratosphere television infrared observation satellite terrasar-x tropical rainfall measuring mission troposphere weather satellite