| Abstrak/Abstract |
Mangrove ecosystems are important for nursery ground, sediment trap, and
coastal protection. Karimunjawa Islands are a group of islands which have mangrove
forest as conservation area, particularly in Karimunjawa and Kemujan Island. This
study aims to map the extent of mangrove forest in multiple years, and examine their
changes. We used multitemporal ASTER VNIR images which recorded in different
year. We used maximum likelihood algorithm to classify each image into some
classes such as building, open land, pond, mangrove forest, and non mangrove
vegetation. Overall accuracy of the images classification is 81,63% with the value of
kappa index equal to 0,8105. Images analyses showed that during 12 years, there
was 27,8775 ha of land conversions occurred from mangrove to open land; 28,735 ha
from mangrove to building; and 27,8775 ha from mangrove to fishpond. Mangrove
forests change were caused by illegal logging, improper utilization of mangrove area,
and economic factor. |
