Characterization and monitoring of semi-arid landscape in the Maule region from satellite data

Revista Brasileira de Engenharia Agrícola e Ambiental

Frau, Carlos M.³  Maldonado, Francisco D.²  Hernández, Yohana M.³  Valenzuela, John G.³  Valeriano, Marcio M.¹  Rojas, Yony O.³  Santos, João R.¹ 

[1] Instituto Nacional de Pesquisas Espaciais, São José dos Campos;Fundação de Ciências, Aplicações e Tecnologias Espaciais, São José dos Campos;Universidad de Talca, Talca, Chile

关键词: semi-arid;    change detection;    remote sensing;    radiometric rotation    INTRODUCCIÓN La desertificación ha sido catalogada como uno de los problemas socioambientales más agudos de Chile;   

DOI  :  10.1590/S1415-43662010000600013

学科分类：农业科学（综合）

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

【 摘 要 】

The objective of this research is to apply the Radiometric Rotation Controlled by No-change Axis (RCNA) technique on Landsat TM images, 2004 and 2008, covering the coastal dry land of the Region of Maule, Chile, in order to obtain the spatial distribution of changes and degradation in the forest landscape. The RCNA procedure allows the use of images without atmospheric calibrations, whose empirical method for the label was based on field observations. The Kappa Index for the change thematic image was 0.74, showing that the recovery and loss of vegetation were 17 and 5%, respectively. SRTM (Shuttle Radar Topography Mission) data were used to derive slope angle, where the major proportion of no-change surface occurs in areas of high and low slope. In the category of recovery of vegetation, the major proportion takes place in the 10-50% slope class. On the other hand, the loss vegetation is uniformly distributed through the whole gradient of the slope angle.

【 授权许可】

CC BY-NC