Three-dimensional modeling of agricultural canopies for thermal IR exitance studies

James Alan Smith; Jeffrey A. Pedelty; Jerrell R. Ballard Jr.; Thomas J. Schmugge

doi:10.1117/12.298184

30 December 1997 Three-dimensional modeling of agricultural canopies for thermal IR exitance studies

James Alan Smith, Jeffrey A. Pedelty, Jerrell R. Ballard Jr., Thomas J. Schmugge

Proceedings Volume 3222, Earth Surface Remote Sensing; (1997) https://doi.org/10.1117/12.298184
Event: Aerospace Remote Sensing '97, 1997, London, United Kingdom

Abstract

We present a simple, three-dimensional vegetation canopy thermal infrared exitance model for agricultural scenes. Computer graphics and ray-tracing techniques are used to estimate three-dimensional canopy view factors and scene shadows. The view factors are used to weight the individual contributions of soil and vegetation emission computed by steady-state energy budget formulations. We compare the three- dimensional model results to a one-dimensional formulation for an agricultural test site from the Hydrologic Atmospheric Pilot Experiment and Modelisation du Bilan Hydrique. The root mean square error is daylight brightness temperature for the one dimensional model was 2.5 degrees Celsius and 2.0 degrees Celsius for the three dimensional model.

Citation Download Citation

James Alan Smith, Jeffrey A. Pedelty, Jerrell R. Ballard Jr., and Thomas J. Schmugge "Three-dimensional modeling of agricultural canopies for thermal IR exitance studies", Proc. SPIE 3222, Earth Surface Remote Sensing, (30 December 1997); https://doi.org/10.1117/12.298184

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