비의류제품

mapping surface energy balance components by combining landsat thematic mapper and ground-based meteorological data

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 477
surface energy balance components were evaluated by combining satellite-based spectral data with on-site measurements of solar irradiance, air temperature, wind speed, and vapor pressure. maps of latent heat flux density ( lambda e) and net radiant flux density (r/sub n/) were produced using landsat thematic mapper (tm) data for three dates' 23 july 1985, 5 april 1986, and 24 june 1986. on each date, a bowen-ratio apparatus located in a vegetated field was used to measure lambda e and r/sub n/ at a point within the field estimates of lambda e and r/sub n/ were also obtained using radiometers aboard an aircraft flown at 150 m above ground level the tm-based estimates differed from the bowen-ratio and aircraft-based estimates by less than 12 percent over mature fields of cotton, wheat, and alfalfa, where lambda e and r/sub n/ ranged from 400 to 700 wm/sup -2/
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