TOTAL WOOD VOLUME ESTIMATION OF EUCALYPTUS SPECIES BY IMAGES OF LANDSAT SATELLITE
| Autor: | Elias Fernando Berra, Catize Brandelero, Rudiney Soares Pereira, Elódio Sebem, Laura Camila de Godoy Goergen, Ana Caroline Paim Benedetti, Diogo Belmonte Lippert |
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| Jazyk: | portugalština |
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Ciência Florestal, Vol 22, Iss 4, Pp 853-864 (2012) |
| Druh dokumentu: | article |
| ISSN: | 0103-9954 1980-5098 19805098 |
| DOI: | 10.5902/198050987566 |
| Popis: | http://dx.doi.org/10.5902/198050987566Models relating spectral answers with biophysical parameters aim estimate variables, like wood volume, without the necessity of frequent field measurements. The objective was to develop models to estimate wood volume by Landsat 5 TM images, supported by regional forest inventory data. The image was geo-referenced and converted to spectral reflectance. After, the images-index NDVI (Normalized Difference Vegetation Index) and SR (Simple Ratio) was generated. The reflectance values of the bands (TM1, TM2, TM3 e TM4 ) and of the indices (NDVI and SR) was related with the wood volume. The biggest correlation with volume was with the NDVI and SR indices. The variables selection was made by Stepwise method, which returned three regression models as significant to explain the variation in volume. Finally, the best fitted model was selected (volume = -830,95 + 46,05 (SR) + 107,47 (TM2)), which was applied on the Landsat image where the pixels had started to represent the estimated volume in m³/ha on the Eucalyptus sp. production units. This model, significant at 95% confidence level, explains 68% of the wood volume variation. |
| Databáze: | Directory of Open Access Journals |
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