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Changyong Cao

Satellite Meteorology and Climatology Division

Sensor Physics Branch
Research Scientist

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photo of Changyong CaoChangyong Cao is a research physical scientist specializing in the calibration of radiometers onboard NOAA's operational environmental satellites. In addition to the operational pre&post calibration support, he is responsible for developing and refining the methodology for inter-satellite calibration using the simultaneous nadir overpass (SNO) method, which has been used for the long-term on-orbit instrument performance monitoring of all radiometers on NOAA's polar orbiting satellites, and is being used by scientists for quantifying inter-satellite calibration biases in developing time series for climate change detection studies. He is co-chair of the Calibration Product Oversight Panel (CalPOP), and the chair for the GOES-R cal/val working group. He also chairs the CEOS/WGCV (Committee on Earth Observation Satellites/Working Group on Calibration/Validation, http://wgcv.ceos.org).

Before joined NOAA in 1999, Changyong was a senior scientist in remote sensing with the System Engineering and Technology Group at Lockheed Martin, NASA Stennis Space Center, where he supported a number of NASA projects ranging from hyperspectral spaceborne/airborne instrument preflight calibration, inflight radiometric and spectral calibration, validation and verification, and advanced remote sensing applications. He was an Assistant Professor and laboratory manager at Southern Illinois University in the early 1990s, where he developed a GIS/RS lab with the emerging Linux and legacy remote sensing image processing systems. Changyong received his Ph.D. degree in Geography specializing in remote sensing and geographic information systems from Louisiana State University in 1992. He received his Bachelor of Science degree in geography from Peking (Beijing) University in 1982.

Most Recent Publications

Wang, L., C. Cao, and P. Ciren, 2007: Assessing NOAA-16 HIRS Radiance Accuracy Using Simultaneous Nadir Overpass Observations from AIRS. J. Atmos. Oceanic Technol., in press.

Cao, C., K. Jarva, and P. Ciren, 2007: An improved algorithm for the operational calibration of HIRS. J. Atmos. Oceanic Technol., 24, 169- 181.

Zou, C., M. Goldberg, Z. Cheng, N. Grody, J. Sullivan, C. Cao, and D. Tarpley, 2006, Recalibration of Microwave Sounding Unit for Climate Studies Using Simultaneous Nadir Overpasses, Journal of Geophysical Research, . Journal of Geophysical Research, 111, D19114, doi:10.1029/2005JD006798.

Cao, C., P. Ciren, M. Goldberg, F. Weng, and C. Zou, 2005, Simultaneous Nadir Overpasses for NOAA-6 to NOAA-17 satellites from 1980 to 2003 for the intersatellite calibration of radiometers, NOAA Technical Report.

Cao, C., H. Xu, J. Sullivan, L. McMillin, P. Ciren, and Y. Hou, 2005, Intersatellite radiance biases for the High Resolution Infrared Radiation Sounders (HIRS) onboard NOAA-15, -16, and -17 from simultaneous nadir observations. Journal of Atmospheric and Oceanic Technology, Vol.22, No. 4, pp. 381-395.

Ignatov, A., C. Cao, J. Sullivan, X. Wu, R. Levin, R. Galvin, 2005, Use of inflight space count measurements to constrain the calibration offset in the AVHRR solar reflectance bands, Journal of Atmospheric and Oceanic Technology, Vol. 22, pp.180-200.

Cao, C., J. Sullivan, E. Maturi, and J. Sapper, 2004, The effect of orbit drift on the calibration of the 3.7um channel of the AVHRR onboard NOAA-14 and its impact on night-time sea surface temperature retrievals (abstractthis link opens in a new window), International Journal of Remote Sensing, Vol. 25, No. 5, 975-986.

Cao, C., M. Weinreb, and H. Xu, 2004, Predicting simultaneous nadir overpasses among polar-orbiting meteorological satellites for the intersatellite calibration of radiometers (abstractthis link opens in a new window). Journal of Atmospheric and Oceanic Technology, Vol. 21, April 2004, pp. 537- 542.

Rao, C.R.N., C. Cao, and N. Zhang, 2003, Inter-calibration of the MODIS and ATSR-2, International Journal of Remote Sensing, Vol. 24, No. 9, pp.1913-1924.

Heidinger, A., C. Cao, and J. Sullivan, 2002, Using MODIS to calibrate AVHRR reflectance channels, Journal of Geophysical Research, Vol. 107, No. D23, 4702.

Cao C., M. Weinreb, and J. Sullivan, 2001, Solar Contamination Effects on the Infrared Channels of the AVHRR, Journal of Geophysical Research, Vol. 106, No. D24, pp. 33463-33469.

E-mail: Changyong.Cao@noaa.gov