| Author | I Nyoman Radiarta |
| Call Number | AIT Thesis no.SR-02-1 |
| Subject(s) | Coral reef ecology Remote sensing Geographic information systems
|
| Note | A thesis submitted in partial fulfillment of the requirements
for the degree of Master of Science |
| Publisher | Asian Institute of Technology |
| Abstract | Coral reefs are important resources for the great majority of tropical countries.
However, very little info1mation on maps showing the distribution of various benthic
habitats in the coral reef is available. Remote sensing technologies have great potential in
overcoming this information void. In this present study, Landsat 7 ETM+ has been used for
investigating coral reef habitats that is mainly dedicated to coral mapping on reef top areas
in shallow water depths. GIS technique and field data are also considered in this study. The
study area is located around three major islands (Mensanak, Medang and Benan Islands)
and several smaller islands in Riau Archipelagos, Riau Province. This area is one of the
Coral ReefManagement (COREMAP) areas.
Bands 1 and 2 were used for mapping coral habitats in the study area. Image
enhancement techniques have been applied for extracting benthic habitats (biotic and
abiotic) such as: band ratio, principal component analysis and water colunm correction.
Algorithms were developed to marginalize the bottom effects on spectral responses. Final
classification using K Mean classification has identified six classes of reef habitat. By
using 20 sampling points, an overall classification accuracy of about 76% (or a kappa
coefficient of 0.69) was achieved.
This study indicated that using Landsat 7 ETM+ with the spatial resolution of 30 m,
sand could be separated from other benthic habitats easily. However, difficulties in
separation of bio habitat from other benthic habitats were found in this study. Separations
between live coral and sand were easier than between live coral and bio habitat because on
the image both of them appeared relatively dark. |
| Year | 2002 |
| Type | Thesis |
| School | School of Advanced Technologies (SAT) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Space Technology Application and Research (SR) |
| Chairperson(s) | Tripathi, Nitin Kumar ; |
| Examination Committee(s) | Borne, Frederic;Jensen, K. R. ; |
| Scholarship Donor(s) | PAATP, ADB Loan No. 1526-INO; |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2002 |