Structural characterization of canopies of Eucalyptus spp. using radiometric data from TM/Landsat 5

CERNE

Mello, Márcio Pupin¹  Ponzoni, Flávio Jorge¹  Pacheco, Ludmila Roque Ferraz¹  Santos, Sandra Benfica dos¹  Campos, Rogério Costa¹  Andrades Filho, Clódis de Oliveira¹ 

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关键词: Spectral characterization;    estimate of biophysical data;    reflectância de dosséis.;   

DOI  :  10.1590/S0104-77602012000100013

来源: Universidade Federal de Lavras-UFLA

【 摘 要 】

Empirical approaches and, more recently, physical approaches, have grounded the establishment of logical connections between radiometric variables derived from remote data and biophysical variables derived from vegetation cover. This study was aimed at evaluating correlations of dendrometric and density data from canopies of Eucalyptus spp., as collected in Capão Bonito forest unit, with radiometric data from imagery acquired by the TM/Landsat-5 sensor on two orbital passages over the study site (dates close to field data collection). Results indicate that stronger correlations were identified between crown dimensions and canopy height with near-infrared spectral band data (ρ_s4), irrespective of the satellite passage date. Estimates of spatial distribution of dendrometric data and canopy density (D) using spectral characterization were consistent with the spatial distribution of tree ages during the study period. Statistical tests were applied to evaluate performance disparities of empirical models depending on which date data were acquired. Results indicated a significant difference between models based on distinct data acquisition dates.

【 授权许可】

Unknown