Mapping net radiation using Landsat 5 imagery and digital elevation model

Revista Brasileira de Engenharia Agrícola e Ambiental

Di Pace, Frederico T.²  Silva, Vicente de P. R. da³  Silva, Bernardo B. da³  Silva, Saulo T. A. da¹ 

[1]UFCG

[2]UFAL

[3]UFCG, Campina Grande

关键词: radiance;    surface albedo;    emissivity    INTRODUÇÃO O conhecimento do saldo de radiação é fundamental em estudos agrometeorológicos;    de monitoramento climático e previsão de tempo;   

DOI  :  10.1590/S1415-43662008000400009

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

Net radiation is an important component of the surface energy balance in studies of evapotranspiration of irrigated crops and in evaporation of hydrological basins. The objective of this research was to determine the surface radiation balance, by using multispectral imagery of the Thematic Mapper (Landsat 5 satellite). In this study the SEBAL (Surface Energy Balance Algorithm for Land) and DEM (Digital Elevation Model) were used in order to correct the albedo and vegetation indices under the influence of the slope aspects were used for each study area. TM (Thematic Mapper) imageries were used for two different dates (December 4, 2000 and October 4, 2001). The calculations were accomplished with and without use of the DEM. The land surface temperature and albedo values with DEM were larger than without DEM in both years, for two selected areas. Results also show that for obtaining net radiation based on imagery of the TM - Landsat 5 the topographical effects of the study area must be considered.

【 授权许可】

CC BY-NC