USE OF EO-1 HYPERION DATA TO CALCULATE SPECTRAL BAND ADJUSTMENT FACTOR (SBAF) BETWEEN THE L7 ETM+ AND TERRA MODIS SENSORS G. Chander a , N. Mishra b , D. L. Helder b , D. Aaron b , T. Choi c , A. Angal d , X. Xiong e a SGT, Inc., U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center, Sioux Falls, SD, 57198, USA. Work performed under U.S. Geological Survey contract 08HQCN0005 b South Dakota State University (SDSU), Brookings, SD, 57007, USA c Sigma Space Corporation, 10210 Greenbelt Road, Lanham, MD, 20706, USA d Science Systems and Applications (SSAI), Inc., 10210 Greenbelt Road, Lanham, MD, 20706, USA e NASA Goddard Space Flight Center (GSFC), Greenbelt, MD, 20771, USA 1. INTRODUCTION To monitor the land surface processes over a wide range of temporal and spatial scales, it is critical to have coordinated observations of the Earth’s surface using imagery acquired from multiple spaceborne imaging sensors. However, an integrated global observation framework requires an understanding of how land surface processes are differently seen by various sensors. This is particularly true for the sensors acquiring data in spectral bands whose relative spectral responses (RSRs) are not similar and thus may produce significantly different results while observing the same target depending on the surface characteristics. The characterization and quantification of these effects are necessary to achieve an integrated Global Earth Observation System of Systems (GEOSS) for coordinated and sustained observation of the Earth. Previous studies focused on monitoring the long-term on-orbit calibration stability of the Terra Moderate Resolution Imaging Spectroradiometer (MODIS) and the Landsat 7 (L7) Enhanced Thematic Mapper Plus (ETM+) sensors using the Committee on Earth Observation Satellites (CEOS) reference standard pseudo- invariant test sites (Libya 4, Mauritania 1/2, Algeria 3, Libya 1, and Algeria 5) [1], [2], & [3]. The ETM+ has six reflective spectral bands at 30 m spatial resolution with spectral coverage from 0.45 to 2.36 m, one panchromatic band at 15 m spatial resolution, and one 60 m spatial resolution thermal band. The MODIS sensor has 36 spectral bands, with band center wavelengths ranging from 0.41 to 14.23 m. MODIS Bands 1 and 2 have a spatial resolution of 250 m at nadir, Bands 3–7 of 500 m at nadir, and Bands 8–36 of 1 km at nadir. In this study, a spectral band adjustment factor (SBAF) is derived using hyperspectral Earth Observing-1 (EO-1) Hyperion measurements. Hyperion is a high resolution grating imaging spectrometer, capable of resolving 220 spectral bands from 0.4 to 2.5 microns with 30 m spatial resolution, and provides near continuous (hyperspectral) information regarding the spectral signature of the ground. Hyperion images a 7.5 km by 100 km surface area and provides 10 nm (sampling interval) contiguous spectral bands. Fig. 1 illustrates a typical Libya 4 top-of- atmosphere (TOA) reflectance spectrum and compares the RSR profiles of the ETM+ and MODIS sensors.