Landsat TM image restoration for mapping narrow water channels connecting small lake systems in Central Amazon: Mamirauá Sustainable Development Reserve - RDSM *
Dayson
Jardim-Lima, National Institute of Amazonian Research - INPA / Project INPA/Max-Planck, dayson@ltid.inpe.br
(Presenting)
Maria Teresa
Fernandez
Piedade, National Institute of Amazonian Research - INPA / Project INPA/Max-Planck, maitepp@internext.com.br
Helder
Lima
Queiroz, Mamirauá Sustainable Development Institute - IDSM, hqueiroz@ufpa.br
Evlyn
Márcia Leão de Moraes
Novo, National Institute of Space Research -INPE, evlyn@ltid.inpe.br
Jarauá and Mamirauá Lake Systems of the Focal Area of Mamirauá Sustainable Development Reserve - RDSM are characterized for a myriad of small lakes, either isolated or connected among themselves. The degree of lake connection to main rivers (Solimões and Japurá) along time is a key aspect for the understanding of biogeochemistry processes taking place in the area. The RDSM size (260,000 ha) and complexity, however, prevents an accurate mapping of this connection over time. This paper reports the use of image restoration techniques to improve spatial resolution of Landsat-5TM images in order to map lake connectivity changes between the high and low water. Images (Path/Row 001/62) were acquired at extreme low water (300 cm) and high water (1400 cm) levels. The images were submitted to restoration. Several pixel sizes were tested (from 25 to 5 m), Results showed that 10 to 15 m restoration provided the best channel definition allowing to map channel otherwise not defined in the images.