WO2008106770-A2  KERRIGAN J.R. ET AL.: 'Development of a lunar-source imaging GFCR for measurement of tropospheric carbon monoxide' PROCEEDINGS OF SPIE-INTERNATIONAL SOCIETY OF OPTICAL ENGINEERING vol. 4360, 2003, pages 682 - 689;  TOLTON B.T. ET AL.: 'A concept for a gas-filter correlation radiometer to remotely sense the atmospheric carbon dioxide column from space' GEOSCIENCE AND REMOTE SENSING SYMPOSIUM 2002, pages 2128 - 2120, XP010598528WO2008106770-A3  TOLTON B.T. ET AL.: 'A concept for a gas-filter correlation radiometer to remotely sense the atmospheric carbon dioxide column from space' GEOSCIENCE AND REMOTE SENSING SYMPOSIUM 2002, pages 2128 - 2120, XP010598528;  KERRIGAN J.R. ET AL.: 'Development of a lunar-source imaging GFCR for measurement of tropospheric carbon monoxide' PROCEEDINGS OF SPIE-INTERNATIONAL SOCIETY OF OPTICAL ENGINEERING vol. 4360, 2003, pages 682 - 689, XP008128133;  See also references of EP 2162709A2;  TOLTON B.T. ET AL.: "A concept for a gas-filter correlation radiometer to remotely sense the atmospheric carbon dioxide column from space", GEOSCIENCE AND REMOTE SENSING SYMPOSIUM, 2002, pages 2128 - 2120, XP010598528;  KERRIGAN J.R. ET AL.: "Development of a lunar-source imaging GFCR for measurement of tropospheric carbon monoxide", PROCEEDINGS OF SPIE-INTERNATIONAL SOCIETY OF OPTICAL ENGINEERING, vol. 4360, 2003, pages 682 - 689, XP008128133;  See also references of EP 2162709A4EP2162709-A2  PFISTER G ET AL: "Effects of a spectral surface reflectance on measurements of backscattered solar radiation: application to the MOPITT methane retrieval", JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY AMERICAN METEOROL. SOC. USA, vol. 22, no. 5, May 2005 (2005-05), pages 566-574, XP5512156, ISSN: 0739-0572;  SHU-PENG HO ET AL: "Improvement of the global surface emissivity from MOPITT measurements and its impacts on the retrievals of tropospheric carbon monoxide profiles", PROCEEDINGS OF THE SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING SPIE-INT. SOC. OPT. ENG. USA, vol. 5652, no. 1, 2004, pages 124-135, XP040193954, ISSN: 0277-786X;  YASUSHI YAMAGUCHI ET AL: "Overview of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER)", IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 36, no. 4, 1 July 1998 (1998-07-01), XP011021073, ISSN: 0196-2892;  HUNT L A ET AL: "Simultaneous Earth views from CERES, MISR and MOPITT", GEOSCIENCE AND REMOTE SENSING SYMPOSIUM, 2004. IGARSS '04. PROCEEDINGS . 2004 IEEE INTERNATIONAL ANCHORAGE, AK, USA 20-24 SEPT. 2004, PISCATAWAY, NJ, USA,IEEE, vol. 7, 20 September 2004 (2004-09-20), pages 4523-4526, XP010751915, DOI: 10.1109/IGARSS.2004.1370160 ISBN: 978-0-7803-8742-3;  XIAOXIONG XIONG ET AL: "An overview of MODIS radiometric calibration and characterization", ADVANCES IN ATMOSPHERIC SCIENCES, SCIENCE PRESS, BE, vol. 23, no. 1, 1 January 2006 (2006-01-01), pages 69-79, XP019317917, ISSN: 1861-9533;  See also references of WO 2008106770A2US8158944-B2  Tolton, B.T., and D. Yashcov, "A Concept for a Gas-Filter Correlation Radiometer to Remotely Sense the Atmospheric Carbon Dioxide Column From Space," IEEE International Geoscience and Remote Sensing Symposium [IGARSS '02], Toronto, Jun. 24-28, 2002, vol. 4, pp. 2118-2120.;  Ho, S.-P., et al., "Improvement of the Global Surface Emissivity From MOPITT Measurements and Its Impacts on the Retrievals of Tropospheric Carbon Monoxide Profiles," in S.C.Tsay, et al. (eds.), Proceedings of SPIE_Passive Optical Remote Sensing of the Atmosphere and Clouds IV 5652(1):124-135, 2004.;  Hunt, L.A., and N. A. Ritchey, "Simultaneous Earth Views From CERES, MISR and MOPITT," Proceedings of IEEE International Geoscience and Remote Sensing Symposium (IGARSS '04), Anchorage, Alaska, Sep. 20-24, 2004, vol. 7, pp. 4523-4526.;  Pfister, G., et al., "Effects of a Spectral Surface on Measurements of Backscattered Solar Radiation: Application to the MOPITT Methane Retrieval," Journal of Atmospheric and Oceanic Technology 22(5):566-574, May 2005.;  Supplementary European Search Report mailed Nov. 17, 2011, issued in corresponding European Application No. EP 08 714 716, filed Mar. 3, 2008, 12 pages.;  Yamaguchi, Y., et al., "Overview of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER)," IEEE Transactions on Geoscience and Remote Sensing 36(4):1062-1071, Jul. 1998.;  Xiong, X., and W. Barnes, "An Overview of MODIS Radiometric Calibration and Characterization," Advances in Atmospheric Sciences 23(1):69-79, Jan. 2006.