Amit Angal

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Amit Angal

  • SENIOR ENGINEER
  • 301.867.2041
  • NASA/GSFC
  • Mail Code: 618
  • LANHAM , MD 20706
  • Employer: SCIENCE SYSTEMS AND APPLICATIONS INC
  • Current Projects

    Joint Polar-orbiting Satellite System (JPSS) Program

    Support the pre-flight characterization of the JPSS-2 VIIRS instrument

    Support the early on-orbit calibration and characterization of the JPSS-1 VIIRS instrument

    MODIS Characterization Support Team

    On-orbit characterization of the MODIS instruments onboard the Terra and Aqua satellites

    VIIRS Characterization Support Team

    On-orbit calibration of the Suomi NPP and NOAA-20 VIIRS instruments

    Awards

    2017 Hydrosphere, Biosphere and Geophysics HBG Annual Peer Award for Scientific/Technical Support

    2016 NASA Group Achievement Award (MODIS Characterization Support Team)

    2012 HOBI Group Achievement Award (MODIS Characterization Support Team and MODIS sensor Working Group)

    Selected Publications

    Refereed

    Angal, A., X. Xiong, Q. Mu, et al. D. R. Doelling, R. Bhatt, and A. Wu. 2018. "Results From the Deep Convective Clouds-Based Response Versus Scan-Angle Characterization for the MODIS Reflective Solar Bands." IEEE Transactions on Geoscience and Remote Sensing, 56 (2): 1115-1128 [10.1109/tgrs.2017.2759660]

    Angal, A., X. Xiong, A. Wu, X. Geng, and H. Chen. 2018. "Improvements in the On-Orbit Response Versus Scan Angle Characterization of the Aqua MODIS Reflective Solar Bands." IEEE Transactions on Geoscience and Remote Sensing, 56 (3): 1728-1738 [10.1109/tgrs.2017.2767206]

    Xiong, X., A. Angal, W. L. Barnes, et al. H. Chen, V. Chiang, X. Geng, Y. Li, K. Twedt, Z. Wang, T. Wilson, and A. Wu. 2018. "Updates of Moderate Resolution Imaging Spectroradiometer on-orbit calibration uncertainty assessments." Journal of Applied Remote Sensing, 12 (03): 1 [10.1117/1.jrs.12.034001]

    Angal, A., X. Xiong, D. Helder, M. Kaewmanee, and L. Leigh. 2018. "Assessing the calibration differences in the reflective solar bands of Terra MODIS and Landsat-7 enhanced thematic mapper plus." Journal of Applied Remote Sensing, 12 (04): 1 [10.1117/1.jrs.12.044002]

    Oudrari, H., J. McIntire, X. Xiong, et al. J. Butler, Q. Ji, T. Schwarting, and A. Angal. 2018. "An Overall Assessment of JPSS-2 VIIRS Radiometric Performance Based on Pre-Launch Testing." Remote Sensing, 10 (12): 1921 [10.3390/rs10121921]

    Bhatt, R., D. R. Doelling, A. Angal, et al. X. Xiong, B. Scarino, A. Gopalan, C. Haney, and A. Wu. 2017. "Characterizing response versus scan-angle for MODIS reflective solar bands using deep convective clouds." Journal of Applied Remote Sensing, 11 (1): 016014 [10.1117/1.jrs.11.016014]

    Angal, A., X. Xiong, and A. Wu. 2017. "Monitoring the On-Orbit Calibration of Terra MODIS Reflective Solar Bands Using Simultaneous Terra MISR Observations." IEEE Transactions on Geoscience and Remote Sensing, 55 (3): 1648-1659 [10.1109/tgrs.2016.2628704]

    Chang, T., X. Xiong, A. Angal, A. Wu, and X. Geng. 2017. "Aqua and Terra MODIS RSB Calibration Comparison Using BRDF Modeled Reflectance." IEEE Transactions on Geoscience and Remote Sensing, 55 (4): 2288-2298 [10.1109/tgrs.2016.2641258]

    Wu, A., X. Geng, A. Wald, A. Angal, and X. Xiong. 2017. "Assessment of Terra MODIS On-Orbit Polarization Sensitivity Using Pseudoinvariant Desert Sites." IEEE Transactions on Geoscience and Remote Sensing, 55 (7): 4168-4176 [10.1109/tgrs.2017.2689719]

    Mu, Q., A. Wu, X. Xiong, et al. D. Doelling, A. Angal, T. Chang, and R. Bhatt. 2017. "Optimization of a Deep Convective Cloud Technique in Evaluating the Long-Term Radiometric Stability of MODIS Reflective Solar Bands." Remote Sensing, 9 (6): 535 [10.3390/rs9060535]

    Chen, H., X. Xiong, A. Angal, and K. A. Twedt. 2017. "On-Orbit Characterization of the MODIS SDSM Screen for Solar Diffuser Degradation Estimation." IEEE Transactions on Geoscience and Remote Sensing, 55 (11): 6456-6467 [10.1109/tgrs.2017.2728520]

    Chang, T., X. J. Xiong, A. Angal, and Q. Mu. 2016. "Assessment of MODIS RSB detector uniformity using deep convective clouds." J. Geophys. Res. Atmos., 121 (9): 4783-4796 [10.1002/2015jd024652]

    Chen, H., X. Xiong, A. Angal, X. Geng, and A. Wu. 2016. "Alternative method of on-orbit response-versus-scan-angle characterization for MODIS reflective solar bands." J. Appl. Remote Sens, 10 (2): 024004 [10.1117/1.jrs.10.024004]

    Angal, A., X. Xiong, J. Sun, and X. Geng. 2015. "On-orbit noise characterization of MODIS reflective solar bands." Journal of Applied Remote Sensing, 9 (1): 094092 [10.1117/1.jrs.9.094092]

    Xiong, X., M. D. King, V. V. Salomonson, et al. W. L. Barnes, B. N. Wenny, A. Angal, A. Wu, S. Madhavan, and D. O. Link. 2015. "Moderate Resolution Imaging Spectroradiometer on Terra and Aqua Missions." Qian/Optical Payloads for Space Missions, 53-89 [10.1002/9781118945179.ch3]

    Lyapustin, A. I., Y. Wang, X. Xiong, et al. G. Meister, S. E. Platnick, R. C. Levy, B. A. Franz, S. Korkin, T. Hilker, C. J. Tucker, F. G. Hall, P. J. Sellers, A. Wu, and A. A. Angal. 2014. "Scientific impact of MODIS C5 calibration degradation and C6+ improvements." Atmos. Meas. Tech., 7: 4353-4365 [10.5194/amt-7-4353-2014]

    Choi, T., J. Xiong, A. Angal, G. Chander, and J. Que. 2014. "Assessment of the spectral stability of Libya 4, Libya 1, and Mauritania 2 sites using Earth Observing One Hyperion." Journal of Applied Remote Sensing, 8 (1): 083618 [10.1117/1.JRS.8.083618]

    Mishra, N., D. Helder, A. A. Angal, J. Choi, and X. Xiong. 2014. "Absolute Calibration of Optical Satellite Sensors Using Libya 4 Pseudo Invariant Calibration Site." Remote Sens., 6 (2): 1327-1346 [10.3390/rs6021327]

    Sun, J., X. Xiong, A. A. Angal, H. Chen, and X. Geng. 2014. "Time-Dependent Response Versus Scan Angle for MODIS Reflective Solar Bands." Geoscience and Remote Sensing, IEEE Transactions on , 52 (6): 3159-3174 [10.1109/TGRS.2013.2271448]

    Xiong, X., A. Angal, J. Sun, T. Choi, and E. Johnson. 2014. "On-orbit performance of MODIS solar diffuser stability monitor." J. Appl. Remote Sens, 8 (1): 083514 [10.1117/1.jrs.8.083514]

    Chander, G., A. Angal, T. Choi, and J. Xiong. 2013. "Radiometric Cross-Calibration of EO-1 ALI With L7 ETM+ and Terra MODIS Sensors Using Near-Simultaneous Desert Observations." IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing, 6 (2): 386-399 [10.1109/JSTARS.2013.2251999]

    Wu, A., J. Xiong, and A. Angal. 2013. "Derive a MODIS-Based Calibration for the AVHRR Reflective Solar Channels of the NOAA KLM Operational Satellites." IEEE Trans. Geosci. Remote Sensing, 51 (3): 1405-1413 [10.1109/TGRS.2012.2220780]

    Angal, A., J. Xiong, T. Choi, et al. G. Chander, N. Mishra, and D. L. Helder. 2013. "Impact of Terra MODIS Collection 6 on long-term trending comparisons with Landsat 7 ETM+ reflective solar bands." Remote Sensing Letters, 4 (9): 873-881 [10.1080/2150704X.2013.809496]

    Wu, A., J. Xiong, D. R. Doelling, et al. D. Morstad, A. Angal, and R. Bhatt. 2013. "Characterization of Terra and Aqua MODIS VIS, NIR, and SWIR Spectral Bands' Calibration Stability." IEEE Trans. Geosci. Remote Sensing, 51 (7): 4330-4338 [10.1109/TGRS.2012.2226588]

    Chander, G., N. Mishra, D. L. Helder, et al. D. B. Aaron, A. A. Angal, T. Choi, X. Xiong, and D. R. Doelling. 2013. "Applications of Spectral Band Adjustment Factors (SBAF) for Cross-Calibration." IEEE Trans. Geosci. Remote Sensing, 51 (3): 1267-1281 [10.1109/TGRS.2012.2228007]

    Helder, D., K. J. Thome, N. Mishra, et al. G. Chander, X. Xiong, A. A. Angal, and T. Choi. 2013. "Absolute Radiometric Calibration of Landsat Using a Pseudo Invariant Calibration Site." IEEE Transactions on Geoscience and Remote Sensing, 51 (3): 1360-1369 [10.1109/TGRS.2013.2243738]

    Toller, G., J. Xiong, J. Sun, et al. B. Wenny, X. Geng, J. Kuyper, A. Angal, H. Chen, S. Madhavan, and A. Wu. 2013. "Terra and Aqua moderate-resolution imaging spectroradiometer collection 6 level 1B algorithm." Journal of Applied Remote Sensing, 7 (1): 073557 [10.1117/1.JRS.7.073557]

    Angal, A. A., J. Xiong, A. C. Wu, G. Chander, and T. Choi. 2013. "Multitemporal Cross-Calibration of the Terra MODIS and Landsat 7 ETM+ Reflective Solar Bands." IEEE Transactions on Geoscience and Remote Sensing, 51 (4): 1870-1882 [10.1109/TGRS.2012.2235448]

    Angal, A., G. Chander, X. Xiong, T. Choi, and A. Wu. 2011. "Characterization of the Sonoran desert as a radiometric calibration target for Earth observing sensors." Journal of Applied Remote Sensing, 5 (1): 059502-059502-6 [10.1117/1.3613963]

    Wu, A., X. Xiong, A. Angal, and W. Barnes. 2011. "Evaluation of detector-to-detector and mirror side differences for Terra MODIS reflective solar bands using simultaneous MISR observations." International Journal of Remote Sensing, 32 (2): 299-312 [10.1080/01431160903464138]

    Chander, G., X. Xiong, T. Choi, and A. A. Angal. 2010. "Monitoring on-orbit calibration stability of the Terra MODIS and Landsat 7 ETM+ sensors using pseudo-invariant test sites." Remote Sensing of Environment, 114 (4): 925-939 [10.1016/j.rse.2009.12.003]

    Angal, A. A., X. Xiong, T. Choi, and G. Chander. 2010. "Using the Sonoran and Libyan Desert test sites to monitor the temporal stability of reflective solar bands for Landsat 7 enhanced thematic mapper plus and Terra moderate resolution imaging spectroradiometer sensors." Journal of Applied Remote Sensing, [10.1117/1.3424910]

    Xiong, X. (., A. Wu, B. Wenny, J. Choi, and A. Angal. 2010. "Progress and lessons from MODIS calibration intercomparison using ground test sites." Canadian Journal of Remote Sensing, 36 (5): 540-552 [10.5589/m10-082]

    Selected Publications

    Refereed

    Angal, A., X. Xiong, Q. Mu, et al. D. R. Doelling, R. Bhatt, and A. Wu. 2018. "Results From the Deep Convective Clouds-Based Response Versus Scan-Angle Characterization for the MODIS Reflective Solar Bands." IEEE Transactions on Geoscience and Remote Sensing 56 (2): 1115-1128 [10.1109/tgrs.2017.2759660]

    Angal, A., X. Xiong, A. Wu, X. Geng, and H. Chen. 2018. "Improvements in the On-Orbit Response Versus Scan Angle Characterization of the Aqua MODIS Reflective Solar Bands." IEEE Transactions on Geoscience and Remote Sensing 56 (3): 1728-1738 [10.1109/tgrs.2017.2767206]

    Xiong, X., A. Angal, W. L. Barnes, et al. H. Chen, V. Chiang, X. Geng, Y. Li, K. Twedt, Z. Wang, T. Wilson, and A. Wu. 2018. "Updates of Moderate Resolution Imaging Spectroradiometer on-orbit calibration uncertainty assessments." Journal of Applied Remote Sensing 12 (03): 1 [10.1117/1.jrs.12.034001]

    Angal, A., X. Xiong, D. Helder, M. Kaewmanee, and L. Leigh. 2018. "Assessing the calibration differences in the reflective solar bands of Terra MODIS and Landsat-7 enhanced thematic mapper plus." Journal of Applied Remote Sensing 12 (04): 1 [10.1117/1.jrs.12.044002]

    Oudrari, H., J. McIntire, X. Xiong, et al. J. Butler, Q. Ji, T. Schwarting, and A. Angal. 2018. "An Overall Assessment of JPSS-2 VIIRS Radiometric Performance Based on Pre-Launch Testing." Remote Sensing 10 (12): 1921 [10.3390/rs10121921]

    Bhatt, R., D. R. Doelling, A. Angal, et al. X. Xiong, B. Scarino, A. Gopalan, C. Haney, and A. Wu. 2017. "Characterizing response versus scan-angle for MODIS reflective solar bands using deep convective clouds." Journal of Applied Remote Sensing 11 (1): 016014 [10.1117/1.jrs.11.016014]

    Angal, A., X. Xiong, and A. Wu. 2017. "Monitoring the On-Orbit Calibration of Terra MODIS Reflective Solar Bands Using Simultaneous Terra MISR Observations." IEEE Transactions on Geoscience and Remote Sensing 55 (3): 1648-1659 [10.1109/tgrs.2016.2628704]

    Chang, T., X. Xiong, A. Angal, A. Wu, and X. Geng. 2017. "Aqua and Terra MODIS RSB Calibration Comparison Using BRDF Modeled Reflectance." IEEE Transactions on Geoscience and Remote Sensing 55 (4): 2288-2298 [10.1109/tgrs.2016.2641258]

    Wu, A., X. Geng, A. Wald, A. Angal, and X. Xiong. 2017. "Assessment of Terra MODIS On-Orbit Polarization Sensitivity Using Pseudoinvariant Desert Sites." IEEE Transactions on Geoscience and Remote Sensing 55 (7): 4168-4176 [10.1109/tgrs.2017.2689719]

    Mu, Q., A. Wu, X. Xiong, et al. D. Doelling, A. Angal, T. Chang, and R. Bhatt. 2017. "Optimization of a Deep Convective Cloud Technique in Evaluating the Long-Term Radiometric Stability of MODIS Reflective Solar Bands." Remote Sensing 9 (6): 535 [10.3390/rs9060535]

    Chen, H., X. Xiong, A. Angal, and K. A. Twedt. 2017. "On-Orbit Characterization of the MODIS SDSM Screen for Solar Diffuser Degradation Estimation." IEEE Transactions on Geoscience and Remote Sensing 55 (11): 6456-6467 [10.1109/tgrs.2017.2728520]

    Chang, T., X. J. Xiong, A. Angal, and Q. Mu. 2016. "Assessment of MODIS RSB detector uniformity using deep convective clouds." J. Geophys. Res. Atmos. 121 (9): 4783-4796 [10.1002/2015jd024652]

    Chen, H., X. Xiong, A. Angal, X. Geng, and A. Wu. 2016. "Alternative method of on-orbit response-versus-scan-angle characterization for MODIS reflective solar bands." J. Appl. Remote Sens 10 (2): 024004 [10.1117/1.jrs.10.024004]

    Angal, A., X. Xiong, J. Sun, and X. Geng. 2015. "On-orbit noise characterization of MODIS reflective solar bands." Journal of Applied Remote Sensing 9 (1): 094092 [10.1117/1.jrs.9.094092]

    Xiong, X., M. D. King, V. V. Salomonson, et al. W. L. Barnes, B. N. Wenny, A. Angal, A. Wu, S. Madhavan, and D. O. Link. 2015. "Moderate Resolution Imaging Spectroradiometer on Terra and Aqua Missions." Qian/Optical Payloads for Space Missions 53-89 [10.1002/9781118945179.ch3]

    Lyapustin, A. I., Y. Wang, X. Xiong, et al. G. Meister, S. E. Platnick, R. C. Levy, B. A. Franz, S. Korkin, T. Hilker, C. J. Tucker, F. G. Hall, P. J. Sellers, A. Wu, and A. A. Angal. 2014. "Scientific impact of MODIS C5 calibration degradation and C6+ improvements." Atmos. Meas. Tech. 7 4353-4365 [10.5194/amt-7-4353-2014]

    Choi, T., J. Xiong, A. Angal, G. Chander, and J. Que. 2014. "Assessment of the spectral stability of Libya 4, Libya 1, and Mauritania 2 sites using Earth Observing One Hyperion." Journal of Applied Remote Sensing 8 (1): 083618 [10.1117/1.JRS.8.083618]

    Mishra, N., D. Helder, A. A. Angal, J. Choi, and X. Xiong. 2014. "Absolute Calibration of Optical Satellite Sensors Using Libya 4 Pseudo Invariant Calibration Site." Remote Sens. 6 (2): 1327-1346 [10.3390/rs6021327]

    Sun, J., X. Xiong, A. A. Angal, H. Chen, and X. Geng. 2014. "Time-Dependent Response Versus Scan Angle for MODIS Reflective Solar Bands." Geoscience and Remote Sensing, IEEE Transactions on 52 (6): 3159-3174 [10.1109/TGRS.2013.2271448]

    Xiong, X., A. Angal, J. Sun, T. Choi, and E. Johnson. 2014. "On-orbit performance of MODIS solar diffuser stability monitor." J. Appl. Remote Sens 8 (1): 083514 [10.1117/1.jrs.8.083514]

    Chander, G., A. Angal, T. Choi, and J. Xiong. 2013. "Radiometric Cross-Calibration of EO-1 ALI With L7 ETM+ and Terra MODIS Sensors Using Near-Simultaneous Desert Observations." IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing 6 (2): 386-399 [10.1109/JSTARS.2013.2251999]

    Wu, A., J. Xiong, and A. Angal. 2013. "Derive a MODIS-Based Calibration for the AVHRR Reflective Solar Channels of the NOAA KLM Operational Satellites." IEEE Trans. Geosci. Remote Sensing 51 (3): 1405-1413 [10.1109/TGRS.2012.2220780]

    Angal, A., J. Xiong, T. Choi, et al. G. Chander, N. Mishra, and D. L. Helder. 2013. "Impact of Terra MODIS Collection 6 on long-term trending comparisons with Landsat 7 ETM+ reflective solar bands." Remote Sensing Letters 4 (9): 873-881 [10.1080/2150704X.2013.809496]

    Wu, A., J. Xiong, D. R. Doelling, et al. D. Morstad, A. Angal, and R. Bhatt. 2013. "Characterization of Terra and Aqua MODIS VIS, NIR, and SWIR Spectral Bands' Calibration Stability." IEEE Trans. Geosci. Remote Sensing 51 (7): 4330-4338 [10.1109/TGRS.2012.2226588]

    Chander, G., N. Mishra, D. L. Helder, et al. D. B. Aaron, A. A. Angal, T. Choi, X. Xiong, and D. R. Doelling. 2013. "Applications of Spectral Band Adjustment Factors (SBAF) for Cross-Calibration." IEEE Trans. Geosci. Remote Sensing 51 (3): 1267-1281 [10.1109/TGRS.2012.2228007]

    Helder, D., K. J. Thome, N. Mishra, et al. G. Chander, X. Xiong, A. A. Angal, and T. Choi. 2013. "Absolute Radiometric Calibration of Landsat Using a Pseudo Invariant Calibration Site." IEEE Transactions on Geoscience and Remote Sensing 51 (3): 1360-1369 [10.1109/TGRS.2013.2243738]

    Toller, G., J. Xiong, J. Sun, et al. B. Wenny, X. Geng, J. Kuyper, A. Angal, H. Chen, S. Madhavan, and A. Wu. 2013. "Terra and Aqua moderate-resolution imaging spectroradiometer collection 6 level 1B algorithm." Journal of Applied Remote Sensing 7 (1): 073557 [10.1117/1.JRS.7.073557]

    Angal, A. A., J. Xiong, A. C. Wu, G. Chander, and T. Choi. 2013. "Multitemporal Cross-Calibration of the Terra MODIS and Landsat 7 ETM+ Reflective Solar Bands." IEEE Transactions on Geoscience and Remote Sensing 51 (4): 1870-1882 [10.1109/TGRS.2012.2235448]

    Angal, A., G. Chander, X. Xiong, T. Choi, and A. Wu. 2011. "Characterization of the Sonoran desert as a radiometric calibration target for Earth observing sensors." Journal of Applied Remote Sensing 5 (1): 059502-059502-6 [10.1117/1.3613963]

    Wu, A., X. Xiong, A. Angal, and W. Barnes. 2011. "Evaluation of detector-to-detector and mirror side differences for Terra MODIS reflective solar bands using simultaneous MISR observations." International Journal of Remote Sensing 32 (2): 299-312 [10.1080/01431160903464138]

    Chander, G., X. Xiong, T. Choi, and A. A. Angal. 2010. "Monitoring on-orbit calibration stability of the Terra MODIS and Landsat 7 ETM+ sensors using pseudo-invariant test sites." Remote Sensing of Environment 114 (4): 925-939 [10.1016/j.rse.2009.12.003]

    Angal, A. A., X. Xiong, T. Choi, and G. Chander. 2010. "Using the Sonoran and Libyan Desert test sites to monitor the temporal stability of reflective solar bands for Landsat 7 enhanced thematic mapper plus and Terra moderate resolution imaging spectroradiometer sensors." Journal of Applied Remote Sensing [10.1117/1.3424910]

    Xiong, X. (., A. Wu, B. Wenny, J. Choi, and A. Angal. 2010. "Progress and lessons from MODIS calibration intercomparison using ground test sites." Canadian Journal of Remote Sensing 36 (5): 540-552 [10.5589/m10-082]

                                                                                                                                                                                            
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