Hunt, E. Raymond


Research Physical Scientist


  • 1984 Ph.D. (Botany) University of Michigan, Ann Arbor, MI
  • 1981 M.S. (Botany) University of Michigan, Ann Arbor, MI
  • 1978 B.S. (Botany) Ohio University, Athens, OH

Research Interests

  • Detection of invasive plant species using remote sensing (see 'On the Research Side' in the January, 2008 BARC e-Newsletter)
  • Estimation of canopy water content using shortwave infrared reflectance
  • Combination of remote sensing and modeling to determine carbon balance of vegetation
  • Use of Unmanned Airborne Vehicles (UAV's) as an alternative platform for agricultural remote sensing


Recent Past Projects


Previous Career

  • 1984-1986: University of California at Los Angeles, Laboratory of Biomedical and Environmental Sciences, Los Angeles, CA; Postdoctoral Research Associate
  • 1986-1989: NASA Jet Propulsion Laboratory, Pasadena, CA; Member of the Technical Staff and Postdoctoral Research Associate
  • 1989-1995: University of Montana, School of Forestry, Missoula, MT; Research Assistant Professor
  • 1995-1999: University of Wyoming, Department of Botany, Laramie, WY; Assistant Professor
  • 1999-Present: USDA-ARS Hydrology and Remote Sensing Laboratory, Beltsville, MD; Research Physical Scientist


Selected Publications

Hunt, E. R., Jr. and Rock, B. N., Detection of changes in leaf water content using near- and middle-infrared reflectances, Remote Sensing of Environment 30:43-54, 1989.

Hunt, E. R., Jr., Running, S. W., and Federer, C. A., Extrapolating plant water flow resistances and capacitances to regional scales, Agricultural and Forest Meteorology 54:169-195, 1991.

Hunt, E. R., Jr., Airborne remote sensing of canopy water thickness scaled from leaf spectrometer data, International Journal of Remote Sensing 12:643-649, 1991.

Hunt, E. R., Jr., Relationship between woody biomass and PAR conversion efficiency for estimating net primary production from NDVI, International Journal of Remote Sensing 15:1725-1730, 1994.

Hunt, E. R., Jr., Piper, S. C., Nemani, R., Keeling, C. D., Otto, R. D., and Running, S. W., Global net carbon exchange and intra-annual atmospheric CO2 concentrations predicted by an ecosystem process model and three-dimensional atmospheric transport model, Global Biogeochemical Cycles 10:431-456, 1996.

Slaton, M. R., Hunt, E. R., Jr., and Smith, W. K., Estimating near-infrared leaf reflectances from leaf structural characteristics, American Journal of Botany 88:278-284, 2001.

Winslow, J. C., Hunt, E. R., Jr., and Piper, S. C., A globally applicable model of daily solar irradiance estimated from air temperature and precipitation data, Ecological Modelling 143:227-243, 2001.

Kelly, R. D., Hunt, E. R., Jr., Reiners, W. A., Smith, W. K., and Welker, J. M., Relationships between daytime carbon dioxide uptake and absorbed photosynthetically active radiation for three different mountain/plains ecosystems, Journal of Geophysical Research - Atmospheres 107(D14):19.1-19.8, (DOI 10.1029/2001JD001181), 2002.

Parker-Williams, A., and Hunt, E. R., Jr., Estimation of leafy spurge cover from hyperspectral imagery using mixture tuned matched filtering, Remote Sensing of Environment 82:446-456, 2002.

Winslow, J. C., Hunt, E. R., Jr., and Piper, S. C., A phenological model of the global C3 and C4 grass distribution with application to the United States Great Plains under a VEMAP climatic change scenario, Ecological Modelling 163:153-173, 2003.

Smith, W. K., Kelly, R. D., Welker, J. M., Fahnestock, J. T., Reiners, W. A., and Hunt, E. R., Jr., Leaf-to-aircraft measurements of net CO2 exchange in a sagebrush steppe ecosystem, Journal of Geophysical Research - Atmospheres 108(D3):9.1-9.9 (DOI: 10.1029/2002JD002512), 2003.

Hunt, E. R., Jr., Everitt, J. H., Ritchie, J. C., Moran, M. S., Booth, D. T., Anderson, G.L., Clark, P. E., and Seyfried, M. S., Applications and research using remote sensing for rangeland management, Photogrammetric Engineering & Remote Sensing 69: 675-693, 2003.

Hunt, E.R., Jr., Daughtry, C. S. T., Walthall, C. L., McMurtrey, J. E., III, and Dulaney, W. P., Agricultural remote sensing using radio-controlled model aircraft, p191-199, In: VanToai, T. (Ed.), Digital Imaging and Spectral Techniques: Applications to Precision Agriculture and Crop Physiology, ASA Special Publication. ASA-CSSA-SSSA, Madison, Wisconsin, 2003.

Parker-Williams, A., and Hunt, E. R. Jr., Accuracy assessment of leafy spurge detection with hyperspectral remote sensing, Journal of Range Management 56:106-112, 2004.

Gillham, J. H., Hild, A. L., Johnson, J., Hunt, E. R., Jr., and Whitson, T. H., WISP: weed invasion susceptibility prediction model for rangeland geographic information systems, Arid Lands Research and Management 18:1-12, 2004.

Daughtry, C. S. T., Hunt, E. R., Jr., and McMurtrey, J. E., III. Assessing crop residue cover using shortwave infrared reflectance, Remote Sensing of Environment 90:126-134, 2004.

Jackson, T. J., Chen, D., Cosh, M., Li, F., Anderson, M., Walthall, C., Doraiswamy, P., and Hunt, E. R., Jr., Vegetation water content mapping using Landsat data derived normalized difference water index for corn and soybeans, Remote Sensing of Environment 92:475-482, 2004.

Hunt, E. R. Jr., Kelly, R. D., Smith, W. K., Fahnestock, J. T., Welker, J. M., and Reiners, W. A. Carbon sequestration in two rangeland ecosystems from remote sensing and net ecosystem exchange, Environmental Management 33(supplement):S432-S441, 2004.

Hunt, E. R., Jr., McMurtrey, J. E., III, Parker-Williams, A. , and Corp, L. A., Spectral characteristics of leafy spurge leaves and flower bracts, Weed Science 52:492-497, 2004.

Daughtry, C. S. T., Hunt, E. R., Jr., Doraiswamy, P. C., and McMurtrey, J. E., III., Remote sensing the spatial distribution of crop residues. Agronomy Journal 97:864-871, 2005.

Hunt, E. R., Jr., Cavigelli, M., Daughtry, C. S. T., McMurtrey, J. E., III, and Walthall, C. L., Evaluation of digital photography from model aircraft for remote sensing of crop biomass and nitrogen status. Precision Agriculture 6:359-378, 2005.

Hunt, E. R. Jr., and Miyake, B. A., Comparison of stocking rates from remote sensing and geospatial data. Rangeland Ecology & Management 59:11-18, 2006.

Hunt, E. R., Jr., and Parker Williams, A. E., Detection of flowering leafy spurge with multispectral imagery. Rangeland Ecology & Management 59:494-499, 2006.

Daughtry, C.S.T., Doraiswamy, P.C., Hunt, E.R., Jr., Stern, A.J., McMurtrey, J.E., Prueger, J.H., Assessing crop residue cover and soil tilliage intensity. Soil and Tilliage Research 91:101-108, 2006.

Doraiswamy, P.C., McCarty, G.W., Hunt, E.R., Jr., Yost, R.S., Doumbia, M. Franzluebbers, A.J., Modeling soil carbon sequestration in agricultural lands of Mali. Agricultural Systems 94:63-74, 2007.

Hunt, E. R., Jr., Daughtry, C.S.T., Kim, M.S., and Parker Williams, A.E., Using canopy reflectance models and spectral angles to assess potential of remote sensing to detect invasive weeds. Journal of Applied Remote Sensing 1(013506):1-17, 2007.

Yilmaz, M.T., Hunt, E.R., Jr., Goins, L.D., Ustin, S.L., Vanderbilt, V.C., and Jackson, T.J., Vegetation water content during SMEX04 from ground data and Landsat 5 Thematic Mapper imagery. Remote Sensing of Environment 112:350-362, 2008.

Daughtry, C.S.T., and Hunt, E.R., Jr., Mitigating the effects of water on remotely sensed estimates of crop residue cover. Remote Sensing of Environment, in press.

Yilmaz, M.T., Hunt, E.R., and Jackson, T.J., Remote sensing of vegetation water content from equivalent water thickness using satellite imagery. Remote Sensing of Environment, in press.

Contact Information

USDA-ARS Hydrology and Remote Sensing Laboratory
Bldg. 007, Rm. 104, BARC-West
Beltsville, MD 20705-2350 USA
Voice: (301) 504-5278
Fax: (301) 504-8931