NASA SP.

aerial aircraft altitude aluminum tube analysis angle Apollo 12 Apollo 9 astronauts band color contamination craters detection Earth Resources Survey effect Ektachrome electron environment environmental ERTS examined exposure field film filter flux footpad glass ground identified imagery impact impact craters indicated infrared laboratory land lens light lower shroud lunar dust lunar fines lunar material lunar soil lunar surface measurements ment meteoroid MICROMETEORITE microwave mirror mission Moon multispectral NASA observed obtained operations optical panchromatic particles percent processing produced radar radiation radiometer record reflectance region relatively remote sensing resolution sample satellite scanner scanning scoop sensor shown in figure shows silicon Skylab solar wind spacecraft spectral spectrum studies surface sampler Surveyor 3 camera Surveyor 3 television techniques Teflon television camera temperature thermal tion track densities tritium vegetation vidicon wavelength