Detecting deforestation with multitemporal L‐band SAR imagery: a case study in western Brazilian Amazônia

Autor:	R. Almeida-Filho, A. Rosenqvist, Y. E. Shimabukuro, R. Silva-Gomez
Rok vydání:	2007
Předmět:	geography geography.geographical_feature_category Backscatter Terrain Old-growth forest Debris law.invention law Deforestation Thematic Mapper Clearing General Earth and Planetary Sciences Radar Geology Remote sensing
Zdroj:	International Journal of Remote Sensing. 28:1383-1390
ISSN:	1366-5901 0143-1161
Popis:	Applications of L-band SAR data to map deforestation are generally based on the assumption that undisturbed forests consistently exhibit higher radar backscatter than deforested areas. In this Letter we show that depending on the stage of the deforestation process (slashing, burning and terrain clearing), this assumption is not always valid, and deforested areas may display a stronger radar return backscatter than primary forest. The analysis of multitemporal SAR images, supported by several Landsat Thematic Mapper (TM) images and field knowledge, showed that wood materials left following the deforestation practices function as corner reflectors, causing an initial increase in the radar backscatter, which then subsequently decreases over time as the debris on these fields are removed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9b3e0af1deaa8d1ead6b11a1bbab2e4d https://doi.org/10.1080/01431160600754591 Zobrazit plný text záznamu