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Contact Info:
Jet Propulsion Laboratory
M/S 300-243
4800 Oak Grove Drive
Pasadena, CA 91109
Phone: 818.354.4321
Email: Click here
Member of:
Radar Science
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Biography:
Ziad Haddad is the supervisor of the Radar Science group (334H) in the Radar Science & Engineering Section. At JPL, he designed, implemented and validated the Tropical Rainfall Measuring Mission's combined radar-radiometer instantaneous precipitation profiling algorithm. He also designed the data compression algorithm for the Cassini mission's synthetic aperture radar, as well as the mosaic filtering algorithm to minimize the uncertainty in the topographic heights estimated by the Shuttle Radar Topography Mission. Ziad also assisted the Phoenix landing radar Tiger Team in developing a real-time processing procedure adapted to the constraints of that radar, and he designed a novel data filtering application to estimate the parameters that characterize the tidal motion on Europa from future interferometric radar measurements. In addition to his work at JPL, Ziad is currently a visiting researcher at the UCLA Joint Institute for Regional Earth System Science and Engineering.
Education:
PhD in mathematics (1983) from MIT
BA in mathematics and computer science (1980) from UCLA
Research Interests:
Ziad''s current research activities include the development of stochastic algorithms for the estimation of precipitation and cloud parameters from remote sensing data, including Bayesian approaches to train passive microwave radiometers (using nearly simultaneous radar measurements) to retrieve the vertical distribution of condensed water.
Professional Experience:
Before joining JPL in 1991, Ziad taught mathematics at MIT, analyzed radar detection and tracking problems at the MIT Lincoln Laboratory, modeled wave propagation in complex media at AT&T/Bell Laboratories, and taught mathematics at the University of California at San Diego while pursuing research in nonlinear filtering and estimation.
Selected Publications:
Lewis, W.E., S. Tanelli, Z. Haddad, G.J. Tripoli, E. Smith,
"Geostationary Doppler Radar and Tropical Cyclone Surveillance,"
J. Atmos. Ocean. Tech..
July 2011.
Fore, A., Z. Haddad, E. Rodriguez, T. N. Krishnamurti,
"Scatterometry Retrievals of Wind in Hurricanes Using Non-Simultaneous Passive Microwave Estimates of Precipitation and a Split-Step Advection/Convection Model,"
Pure Appl. Geophys. 168,
pp. 1-10.
July 2011.
Z.S. Haddad and K.-W. Park,
"Vertical profiling of precipitation with passive microwaves: the main obstacle and one way to overcome it,"
submitted to J. Geophys. Res.
July 2008.
Z.S. Haddad, J.P. Meagher, S.L. Durden, E.A. Smith and E.Im,
"Drop size ambiguities in the retrieval of precipitation profiles from dual-frequency radar measurements,"
J. Atmos. Sci., vol. 63,
pp. 204-217.
January 2006.
W.-K. Tao, E.S. Smith, R.F. Adler, Z.S. Haddad, A.Y. Hou et al,
"Retrieval of latent heating from TRMM measurements,"
Bull. Am. Met. Soc., vol. 87,
pp. 1555-1572.
January 2006.
J.P. Meagher and Z.S. Haddad,
"To what extent can raindrop size be determined by a multiple- frequency radar?,"
J. Appl. Meteor., vol. 45,
pp. 529-536.
2005.
Z.S. Haddad, J.P. Meagher, R.F. Adler, E.A. Smith and E. Im,
"Global variability of precipi- tation according to the Tropical Rainfall Measuring Mission,"
J. Geophys. Res.-A 109, Art. No. D17103.
2004.
K.-S. Kuo, E.A. Smith, Z.S. Haddad, E. Im, T. Iguchi and A. Mugnai,
"Mathematical-physical framework for retrieval of rain DSD properties from du al-frequency Ku-Ka-band satellite radar,"
J. Atmos. Sci., vol. 61,
pp. 2349-2369.
2004.
S.L. Durden, J.P. Meagher and Z.S. Haddad,
"Satellite observations of spatial and interannual variability of lightning and radar reflectivity,"
Geophys. Res. Let., vol. 31,
pp. Art. No. L18111.
2004.
J.P. Meagher, Z.S. Haddad and E. Im,
"Principal component analysis for rain drops and its application to the remote sensing of rain,"
Quart. J. Roy. Met. Soc., vol. 128,
pp. 559-571.
2002.
D. Coppens, Z.S. Haddad and E. Im,
"Estimating the uncertainty in passive microwave rain retrievals,"
J. Atmos. Ocean. Tech., vol. 17,
pp. 1618-1629.
2000.
D. Coppens and Z.S. Haddad,
"Effects of raindrop size distribution variations on microwave brightness temperature calculation,"
J. Geophys. Res., vol. 105,
pp. 24483-24489.
2000.
S.L. Durden and Z.S. Haddad,
"Correction of Doppler radar data for aircraft motion using surface measurements and recursive least squares estimation,"
J. Atmos. Ocean. Tech., vol. 16,
pp. 2026-2029.
1999.
S.L. Durden and Z.S. Haddad,
"Comparison of radar rainfall retrieval algorithms in convective rain during TOGA COARE,"
J. Atmos. Ocean. Tech., vol. 15,
pp. 1091-1096.
1998.
S.L. Durden, Z.S. Haddad, A. Kitiyakara and F.K. Li,
"Effects of nonuniform beam filling on rainfall retrieval for the TRMM precipitation radar,"
J. Atmos. Ocean. Tech., vol. 15,
pp. 635-646.
1998.
Z.S. Haddad, E.A. Smith, C.D. Kummerow, T. Iguchi, M.R. Farrar, S.L. Durden, M. Alves and
W.S. Olson,
"The TRMM ‘Day-1’ radar/radiometer combined rain-profiling algorithm,"
J. Meteor. Soc. Japan, vol. 75,
pp. 799-809.
1997.
Z.S. Haddad, D.A. Short, S.L. Durden, E. Im, S. Hensley, M.B. Grable and R.A. Black,
"A new parametrization of the rain drop size distribution,"
IEEE Trans. Geosci. Remote Sensing, vol. 35,
pp. 532-539.
1997.
S.L. Durden, A. Kitiyakara, E. Im, A.B. Turner, Z.S. Haddad, F.K. Li and W.J. Wilson,
"ARMAR observations of the melting layer during TOGA COARE,"
IEEE Trans. Geosci. Rem. Sens., vol. 35,
pp. 1453-1456.
1997.
Z.S. Haddad and D. Rosenfeld,
"Optimality of empirical Z–R relations,"
Quart. J. Roy. Met. Soc., vol. 123,
pp. 1283-1293.
1997.
A.R. Jameson, F.K. Li, S.L. Durden, Z.S. Haddad, B. Holt, T. Fogarty, E. Im and R.K. Moore,
"SIR-C/X-SAR observations of rain storms,"
Remote Sensing of Environment, vol. 59,
pp. 267-279.
1997.
Z.S. Haddad, P. Dubois and J.J. Van Zyl,
"Bayesian estimation of soil parameters from radar backscatter data,"
IEEE Trans. Geosci. Rem. Sens., vol. 34,
pp. 76-82.
1996.
Z.S. Haddad, E. Im and S.L. Durden,
"Optimal estimation of rain rate profiles from single- frequency radar echoes,"
J. Appl. Meteor., vol. 35,
pp. 214-228.
1996.
Z.S. Haddad, E. Im, S.L. Durden and S. Hensley,
"Stochastic filtering of rain profiles using radar, surface-referenced radar, or combined radar-radiometer measurements,"
J. Appl. Meteor., vol. 35,
pp. 229-242.
1996.
Z.S. Haddad, S.L. Durden and E. Im,
"Parametrizing the raindrop size distribution,"
J. Appl. Meteor., vol. 35,
pp. 3-13.
1996.
S.L. Durden, Z.S. Haddad, L.A. Morrissey and G.P. Livingston,
"Classification of radar imagery over boreal regions for methane exchange studies,"
Int. J. Rem. Sens., vol. 17,
pp. 1267-1273.
1996.
Z.S. Haddad, A.R. Jameson, E. Im and S.L. Durden,
"Improved coupled Z–R and k–R relations and the resulting ambiguities in the determination of the vertical distribution of rain from the radar backscatter and the integrated attenuation,"
J. Appl. Meteor., vol. 34,
pp. 2680-2688.
1995.
Z.S. Haddad, E. Im and S.L. Durden,
"Intrinsic ambiguities in the retrieval of rain rates from radar returns at attenuating wavelengths,"
J. Appl. Meteor., vol. 34,
pp. 2667-2679.
1995.
Z.S. Haddad and S.R. Simanca,
"Filtering image records using wavelets and the Zakai equation,"
IEEE Trans. on PAMI, vol. 17,
pp. 1069-1078.
1995.
S.L. Durden, Z.S. Haddad, E. Im, A. Kitiyakara, F.K. Li, A.B. Turner and W.J. Wilson,
"Measurement of rainfall path attenuation near nadir: a comparison of radar and radiometer methods at 13.8 GHz,"
Radio Sci., vol. 30,
pp. 943-947.
1994.
Z.S. Haddad and B.E. Parkins,
"Designing Doppler signals to overcome transmission nonlin- earities,"
IEEE Trans. on ASSP, vol. 40,
pp. 2459-2463.
1992.
Z.S. Haddad,
"Solutions completes pour les ondes en milieux ´elastiques stratifi´es a frontieres non-planes,"
Revue d’Acoustique, vol. 82,
pp. 105-110.
1987.
Z.S. Haddad,
"A Coxeter group approach to Schubert varieties,"
in Infinite Dimensional Groups with Applications, V.G. Ka?c Ed., Springer Verlag,
pp. 157-167.
1985.
Z.S. Haddad,
"Two remarks on the quaternions,"
Pi Mu Epsilon J., vol. 7,
pp. 32-36.
1981.
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