Aplikasi Citra ALOS PALSAR Multiwaktu Resolusi 50 m dalam Identifikasi Tutupan Lahan di Provinsi Lampung

Abstract

Land cover change is a state of land in which changes occured through passing time due to human activities (Lillesand & Kiefer 1990). Land cover change has different change dynamics between one land to another, that it requires continuous monitoring to observe those changes. The use of remote sensing technology had become a very important part in the mapping of land-closure and land-use, as well as land cover changes associated with the study of vegetation, crops and soil of the biosphere. Cloud cover had posed obstacles in the use of LANDSAT and SPOT optical imagery in Indonesia. Active remote sensing systems (radar) which has the ability to one way technology to overcome the obstacles. In 2006, the Japanese government launched a satellite named ALOS (Advanced Land Observing Sattelite) that carries the radar sensor (JICA 2011). One of the sensor types is PALSAR (Phased Array Type L-band Shynthetic Aperture Radar) operating each year, so it can be used for monitoring land cover change. This study aimed to analyze land cover change and identity the dynamics of changes in one year periods of 2007-2008 and 2008-2009, as well as the two-year period of 2007-2009 using multitime ALOS PALSAR image with spatial resolution of 50 m in Lampung province. Field research was conducted on August 10th until 18th 2012 in Lampung province. The method of this research is visual analysis of land cover change combining RGB HH-HV-HH/HV 1:50.000 scale and matrix of land cover change. The results of the visual analysis of ALOS PALSAR imagery in 50 m resolution showed 17 land cover classes namely water, airport, dry land forest, swamp forest, plantation forest, multiplants field, pineapple field, sugarcane field, open land, savanna, rubber wood plantation, oil palm plantation, settlements, dry land farming, paddy fields, scrub / shrub wetlands, and ponds. The pattern of changes observed in Lampung province was a drastic change in which open land changed into a vegetated land or otherwise vegetated land changed into open land. Based on the type of land cover, the change of land cover in Lampung both in one year and two years periods had the similar kind of change, which was transformation from open land into sugarcane field, open land into pineapples field, sugarcane field into open land, pineapple field into open land, and rubber wood plantation into open land.