); [EMAIL_ADDRESS] (G.S. ); [EMAIL_ADDRESS] (T.Y. ); [EMAIL_ADDRESS] (Q.Z. ); [EMAIL_ADDRESS] (K.F.H. ); [EMAIL_ADDRESS] (E.M.M. ); [EMAIL_ADDRESS] (S.G.U. ); [EMAIL_ADDRESS] (S.W.F.) [PERSON]
1 NASA's Goddard Space Flight Center, Code 618, Greenbelt, MD 20771, USA; [EMAIL_ADDRESS] (C.S.R.N. ); [EMAIL_ADDRESS] (P.K.C. ); [EMAIL_ADDRESS] (G.S. ); [EMAIL_ADDRESS] (T.Y. ); [EMAIL_ADDRESS] (Q.Z. ); [EMAIL_ADDRESS] (K.F.H. ); [EMAIL_ADDRESS] (E.M.M. ); [EMAIL_ADDRESS] (S.G.U. ); [EMAIL_ADDRESS] (S.W.F.) [PERSON]  
1 NASA's Goddard Space Flight Center, Code 618, Greenbelt, MD 20771, USA; [EMAIL_ADDRESS] (C.S.R.N. ); [EMAIL_ADDRESS] (P.K.C. ); [EMAIL_ADDRESS] (G.S. ); tianya@[EMAIL_ADDRESS] (T.Y. ); [EMAIL_ADDRESS] (Q.Z. ); [EMAIL_ADDRESS] (K.F.H. ); [EMAIL_ADDRESS] (E.M.M. ); [EMAIL_ADDRESS] (S.G.U. ); [EMAIL_ADDRESS] (S.W.F.) [PERSON]
1 NASA's Goddard Space Flight Center, Code 618, Greenbelt, MD 20771, USA; [EMAIL_ADDRESS] (initially tasked with testing advancements that could potentially increase sensor performance while reducing instrument mass, power consumption, and cost. The three primary instruments on the EO-1 spacecraft were designed to acquire visible through near-infrared (VNIR) and shortwave infrared (SWIR) wavelength information in the solar reflected spectrum [2]. These are the Advanced Land Imager (ALI), the Hyperion, and the Linear Etalon Imaging Spectrometer Array (LEISA) Atmospheric Corrector (LAC), the latter of which is not discussed further in this paper. EO-1 demonstrated that its 8-band multispectral (MS) imager, ALI, provides a significant improvement over the Landsat 7 Enhanced Thematic Mapper plus (ETM+) and previous Landsat Thematic Mapper (TM) instruments due to increased signal to noise ratio while decreasing instrument size and weight. EO-1 also validated the scientific value of orbital imaging spectroscopy with Hyperion, the first spaceborne hyperspectral land imaging instrument, and demonstrated that a moderate-spatial/high-spectral resolution imager could be used in self-correction of atmospheric effects--to retrieve the apparent surface reflectance from top of atmosphere (TOA) radiances--and systematic errors [3]. It was originally thought that these new technologies could improve the TM/ETM+ sensor series found on the Landsat 4-7 satellites [4; 5], and indeed some of these technologies were utilized for the Landsat 8 Operational Land Imager (OLI) sensor launched in 2013, which featured the adoption of the push-broom style sensor and improved quantization [6; 7]. With no indication of sensor degradation through the end of the one-year baseline mission in 2001, the EO-1 mission was extended, allowing ALI and Hyperion to continue collecting images [3]. The mission was chartered to collect and distribute ALI MS and Hyperion hyperspectral products in response to Data Acquisition Requests (DARs), which were soon established as a collaboration with the US Geological Survey (USGS) Earth Resources Observation and Science (EROS) Data Center (EDC). There were four extensions of the mission [8], during which normal operations continued and the daytime imagery were used in numerous science investigations [9] including characterizing forest structure [10; 11; 12], water quality [13; 14], desert dust flows [15], and disaster monitoring activities [16; 17; 18]. Additionally, the nighttime imagery was greatly utilized by the volcano monitoring network [19; 20].