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Retrieval of land surface albedos from satellite measurements.

机译：从卫星测量值中检索陆地表面反照率。

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摘要

This dissertation discusses a program of research directed to providing a global, monthly Bidirectional Reflectance Distribution Function (BRDF) and albedo dataset at 1 km resolution for use in atmospheric aerosol and global climatological research. BRDF is the quantitative description of the directional properties of a surface, which vary as a function of wavelength and surface structure. Albedo is the integral of BRDF and quantitatively describes the shortwave energy balance at the surface. Both quantities are of interest to researchers in climatology, meteorology and atmospheric physics.; Complex relationships exist between land cover and BRDF and these may be used as a priori information in BRDF retrieval from directional reflectance data. A comparison of such a land cover-constrained retrieval and a conventional, free-inversion retrieval of BRDF and albedo over the KONVEX experimental site demonstrated that the land cover-constrained method produces more accurate BRDF retrievals when observations are limited in number.; After the validation phase, the BRDF and albedo retrieval is applied using existing land cover maps and satellite imagery from NOAA's Advanced Very High Resolution Radiometer instrument. The inversion procedure relies on a many-to-many mapping of land cover classes to BRDF classes dependent on factors such as vegetation senescence and snow cover. Using this procedure, we provide global albedo data for February and July 1995 at 1 and 10 km resolutions.; These data are the first available global 1 km albedo maps which explicitly use both satellite reflectance data and surface-dependent BRDF models, and provide a reference against which NASA's future Earth Observing System Moderate Resolution Imaging Spectroradiometer albedo and BRDF products may be compared. In addition to providing valuable quantitative data, the maps reveal important regional changes in albedo, such as the effects of the Indian Monsoon, the varying effects of snow over forested and treeless land covers and the effects of vegetation senescence in temperate zones.
机译：本论文讨论了一个研究计划，旨在提供分辨率为1 km的全球月度双向反射分布函数（BRDF）和反照率数据集，用于大气气溶胶和全球气候研究。 BRDF是表面方向性的定量描述，其随波长和表面结构的变化而变化。反照率是BRDF的组成部分，定量描述了表面的短波能量平衡。气候学，气象学和大气物理学的研究人员都对这两个数量感兴趣。土地覆盖物与BRDF之间存在复杂的关系，这些关系可以用作从方向反射率数据进行BRDF检索的先验信息。在KONVEX实验地点，对这样的土地覆盖受限的反演和常规的BRDF和反照率的自由反演进行的比较表明，当观测数量有限时，土地覆盖受限的方法会产生更精确的BRDF反演。在验证阶段之后，使用现有的土地覆盖图和来自NOAA的超高分辨率高分辨率辐射计仪器的卫星图像，对BRDF和反照率进行检索。反演程序依赖于土地覆被类别到BRDF类别的多对多映射，取决于植被衰老和积雪等因素。使用此程序，我们以1 km和10 km的分辨率提供了1995年2月和7月的全球反照率数据。这些数据是第一个可用的全球1 km反照率地图，其中明确使用了卫星反射率数据和依赖于地面的BRDF模型，并为NASA未来的地球观测系统中分辨率成像分光辐射度计反照率和BRDF产品进行比较提供了参考。这些地图除了提供有价值的定量数据外，还揭示了反照率的重要区域变化，例如印度季风的影响，积雪覆盖的森林和无树土地覆盖物的变化影响以及温带地区植被衰老的影响。

著录项

  • 作者

    Strugnell, Nicholas Chrisophe.;

  • 作者单位

    Boston University.;

  • 授予单位 Boston University.;
  • 学科 Physical Geography.; Remote Sensing.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 249 p.
  • 总页数 249
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然地理学;遥感技术;
  • 关键词

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