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William Douglas Philpot

  • William Douglas Philpot
  • Dept: Civil and Environmental Engineering
  • Title: Professor
  • Address: 453 Hollister Hall
  • Phone: 607 255-0801
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Engineering was not an obvious initial choice for a carreer. My first degree was a B.A. degree in Music from New York University in 1969. While an undergraduate I was performing professionally in and around NY City with a wide variety of musical groups with the expectation of continuing with music as a career. After graduation, two years in the Army, and a more objective look at my abilities and interests, I returned to school with a different perspective and altered goals, obtaining a B.S. degree in Physics from the State University of New York at Stony Brook. Continuing on to graduate school in oceanography, specializing in ocean optics and remote sensing, I obtained M.S. (1987) and Ph.D. degrees (1981) in Marine Studies at the University of Delaware. Upon graduation I was delighted to join the faculty of the Department of Civil and Environmental Engineering at Cornell University, where I have conducted research in remote sensing that has involved a broad range of applications of remote sensing - from ocean optics to vegetation monitoring to beach trafficability. Sabbatical leaves in academia (RIT, University of Southern Mississippi), industry (WRI) and government (NASA, Naval Research Laboratory) have empowered a broad perspective and knowledge base in remote sensing and radiative transfer while broadening my contact base. I continue to conduct research in a variety of aspects of remote sensing and teaches courses in Remote Sensing and Digital Image Processing.

Research Interests

My research deals with remote sensing of the earth, focusing on mathematical modeling of the physical interactions of light with the earth's atmosphere and surface, and the way those interactions affect the view of the earth and water as seen from satellite. Rather than being primarily concerned with the cultural or geographic patterns displayed in an image, my focus has been on the spectral and spatial patterns at the pixel level and what that implies about the earth's surface and the intervening atmosphere. For example, in my early career the emphasis was on problems related to sensing of water properties in the coastal zone (bathymetry, water quality, bottom type, etc.) That study involves understanding the optical properties of the water, the bottom, and any materials suspended in the water column, and modeling how all of those affect the observed reflectance of the water. In recent years I have been drawn to more land- and atmosphere-based problems, although still with a primary focus on radiative transfer/physical interaction. Most recently, I have been involved in modeling reflectance from soils as they change from saturated to air-dry, with the intent of relating the spectral reflectance to the both the amount and distribution (i.e., pore water, adsorbed water, surface water) of water in the soil, and the effects of the particle size distribution and bulk density of the soil sample. As with the ocean applications, this involves understanding the optical properties (scattering and absorption) of soils in order to more effectively make remote measurements which could retrieve details related to the compositional and mechanical properties of the soil, as well as the water content. Another aspect of my research has been in the analysis of digital imagery and LIDAR data. Data analysis in this case encompasses topics ranging from geometric and radiometric correction to spatial and spectral pattern recognition and includes general processes as well as specific applications. In image processing the emphasis is on spectral data retrieval and modeling of the spectral-directional reflectance of the earth's surface. For lidar, the emphasis has been on the characterization and interpretation of full waveform lidar, with particular emphasis on the interplay of a bathy metric lidar pulse with different materials on the ocean bottom. Regardless of the sensing system or specific application, the overall goal is to understand the interaction of light with the earth surface in order to improve the interpretation of the remote signal.

Teaching Interests

In designing courses in remote sensing, my objective has been to train intelligent users of data collected from satellite and aircraft. The core philosophy has been that, regardless of the application, intelligent use of these data requires a basic understanding of the underlying physics as well as an acquaintance with the design of the major sensing systems since both of these impact the information content, processing and interpretation of the remote data. Thus, the courses are designed to introduce students to basic radiative transfer modeling, and to provide a survey of the types of sensing systems in use today, the types of data that they produce, and the tools and techniques available for interpretation and analysis, with reference to specific applications as appropriate. This approach fits the audience, which is typically made up of a mix of engineering and non-engineering graduate students having an interest in using remote sensing data for their own research. The two primary courses have been CEE 6100 Remote Sensing Fundamentals and CEE 6150 Digital Image Processing. Other remote sensing topics are covered using CEE 6180 Special Topics: Remote Sensing course and, when appropriate, CEE 6170 Project in Remote Sensing.


Selected Publications

  • Bachmann, Charles M., Roy J. Hughes, Andrei Abelev, van Roggen, Nichols Elena, C. Reid, Gordon Mattis, Robert A. Fusina, Rong-Rong Li, Katarina Z. Doctor, Deric Gray, Marcos J. Montes, William Philpot. 2015. "Tools for hyperspectral exploitation of multi-angular spectra (THEMAS): May 2012 and June 2013 Experiments". NRL/MR/723 Washington, D.C., United States: Naval Research Laboratory.
  • Tian, J., W D Philpot. 2015. "Relationship between surface soil water content, evaporation rate, and water absorption band depths in SWIR reflectance spectra." Remote Sensing of Environment 169: 280-289.
  • Sadeghi, M., S B. Jones, W D Philpot. 2015. "A linear physically-based model for remote sensing of soil moisture using short wave infrared bands." Remote Sensing of Environment 164: 66-76.
  • Bachmann, C M., William Douglas Philpot, A. Abelev, D Korwan. 2014. "Phase angle dependence of sand density observable in hyperspectral reflectance." Remote Sensing of Environment 150: 53-65.
  • Kim, Minsu, Joon Yong Park, Yuri Kopilevich, Grady Tuel, William Douglas Philpot. 2013. "Correction for reflected sky radiance in low-altitude coastal hyperspectral images." Applied Optics 52 (32): 7732-7744.

Selected Awards and Honors

  • Emeritus Member (American Society of Photogrammetry and Remote Sensing (ASPRS)) 2015
  • Senior Member (IEEE Geoscience and Remote Sensing Society) 2016
  • 2011 ASPRS Presidential Citation (American Society of Photogrammetry and Remote Sensing) 2011


  • BA (Music), New York University, 1969
  • BS (Physics), State University of New York at Stony Brook, 1973
  • MS (Marine Studies), University of Delaware, 1978
  • Ph D (Marine Studies), University of Delaware, 1981