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REMOTE SENSING APPLICATION IN EVALUATING THE SOUTHERN LEYTE 
GEOTHERMAL PROJECT (SLGP), SOUTHERN LEYTE, PHILIPPINES 
Rex A. Camit, Raymund D.C. Leynes and Nilo A. Apuada” 
PNOC Energy Development Corporation 
Rexcamit@hotmail.com 
Working Group IV/2 
KEY WORDS: Remote Sensing, Geographic Information System, Integration, Hydrothermal, Thermoluminescence. 
ABSTRACT 
Remote Sensing (RS) approach was applied to refine the existing geological and hydrological models of the Southern 
Leyte Geothermal Project (SLGP). Landsat thematic mapper and radar imageries were processed mainly for geological 
and structural interpretations. The spectral classification of altered grounds and/or thermal springs was extracted from 
the Landsat TM imagery using the Normalized Difference Vegetation Index (NDVI) and the Principal Component 
Analysis (PCA) methods. 
This study revealed the spatial relationship between faults, lineaments, stratigraphic contacts and hydrothermal 
manifestations in the project area. The northeast and east-northeast structures dissect the Cantodoc-Tamar volcanic 
edifice and control the distribution of most hydrothermal manifestations (i.e. Mahalo-Mainit thermal area to the east and 
Tabunan thermal area to the west). Mount Cabalian harbors predominant NW structures that are believed to channel 
hydrothermal fluids at deeper levels of the reservoir (i.e. Hugpa kaipohan). This study indicates the existence of more 
than one geothermal system in the Southern Leyte Geothermal Project (SLGP). These include (1) Cabalian, (2) 
Cantodoc and (3) Tamar system. Geophysical (e.g. resistivity and gravity anomalies), geochemical and petrological (i.e. 
thermoluminescence data) data are consistent with this geological evaluation. 
1 INTRODUCTION 
The study area covers the Southern Leyte Geothermal Project (SLGP). It includes the Quaternary volcanoes of Cabalian 
and Cantodoc and Tamar (Figure 1). The study area is bound to the west by Sogod Bay, to the east by the Philippine 
Trough and to the south by Cabalian Bay. 
  
Leyte Guif 
  
      
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International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000. 221