Bulletin of the Geological Society of Malaysia, Volume 59, November 2013, pp. 19 – 26
Geological Agency, Ministry of Energy and Mineral Resouces Republic of Indonesia
Jalan Diponegoro No 57, Bandung 40122, Indonesia
Abstract: Indonesia is an archipelago comprising over 13,700 islands and a total territory of more than seven million km2. Geologically, the earth’s crust in this region displays several special features as a result of the collision of three mega plates, Eurasia, Indiaustralia and Pacific. Inter-related features such as island arcs, volcanic belts, seismic zones, gravity anomaly zones, and deep sea trenches resulted from the collision process.
Knowledge of the regional geology of the entire Indonesian region was greatly advanced by the completion of systematic geological mapping at the scale of 1: 100,000 of Jawa and Madura Islands and at the scale of 1:250,000 on the other islands. A great quantity of data concerning various aspects of geology and geophysics, collected during more than 50 years, has accumulated.
The need for geological information at a larger scale, however, is now increasing. This demand is related to national development programs as well as to Indonesia’s industrial growth. Exploration for energy, mineral and ground water resources, the generation of information for land-use planning and geological hazard mitigation will all benefit from the availability of geological maps at the scale of 1:50,000. Therefore, since 2010 the Geological Agency, Ministry of Energy and Mineral Resources of Republic of Indonesia, has initiated new geological mapping project starting with geological interpretation based on data from satellite imagery combined with existing field data.
The methodology for geological interpretation is based on visual interpretation of remote sensing data of morpho-structural aspects of the imagery combined with field data existing in a GIS environment. Interpretation keys were determined in order to provide guidelines on how to recognize certain geological objects on satellite imagery. Preparation of data including the creation of shaded relief of the digital surface model (DSM) and intensity layer of orthorectified images (ORRI), contour generation, color composite of optical images, drainage pattern generation and fusion of passive and active remotely-sensed images.
Keywords: geological map, remote sensing, Indonesia