Coral reefs change detection using remotely sensed data L a case study in Bintan Beach International Resort, Riau Islands, Indonesia

ABSTRACT

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SYAWALUDIN ALISYAHBANA HARAHAP (2006). Coral Reefs Change

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Q Detection Using Remotely Sensed Data: A Case Study in Bintan Beach

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- % s t International Resort, Riau Islands, Indonesia. Under the direction of

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g VINCENTIUS P. SIREGAR and IDUNG RISDIYANTO.

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~ E X S S _{Bintan Beach International Resort is located on North of Bintan Island}

(I@ Islands province), this area is placed on 104°17'50" to 104°38'36"E and

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f r m 1°6'10" to 1°15'29"N, has soft relief with slope 5 - 15%. Mostly, beach

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m ₄ a r k is covered by sandy beach with the depth of waters is about 1 - 20 meters. ' C Q t D Q C

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Beach International Resort region represent a coastal area that high

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a-((I 3 0. r c * Q s d$amic change. It has competence in conserve, protect as well as develop this

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_{. art& and it have concern and responsive about ecosystem change. In this research,}

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g &&oral reef ecosystem become main target because it very essential matter that

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sh&ld be monitored for planning or to avoid may further change that can damage

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f, The Objectives of this research are to detect and mapping coral reefs using

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~tely sensed data and image processing technique, further to analysis the coral

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change during two periods (1992 and 2003). A two periods of Landsat-5 TM

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2. 3- P) il 14,1992) and Landsat-7 ETM+ (March 04,2003) images with the path/row

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359 was used for coral reef mapping in the Bintan Beach International Resort.

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To properly use these data, a minimum set of correction needs to be made:

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)metric, geometric and water column correction as well as ground-truthing. r

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E unsupervised classification was used for image classification and post-

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ifzcation comparison method was used for change detection.

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The result of training area processing was produced attenuation coeficient

: (k,/kj) are 1.526129 for image of 1992 and 0.879188 for image of 2003. feature classes of coral reef performed in 5 (five) classes were the live coral

, dead coral (DC), dead coral with algal (DCA), sand (S) and macro algal ). The overall accuracy was found in this research is 76.66 %. LC has been m:asing equal to 16.84% or 271.08 ha where in 1992 the area is 422.87 ha to 9 ha in 2003. Also by DC and DCA, in 1992 the area of DC is 535.70 ha, while in 2003 it has been decreasing equal to 17.20% or 258.69 ha in 2003, DCA has been decreasing equal to 15.96% or 256.94 ha from 478.53 ha in to 221.59 in 2003. The improvement of coral reefs class is viewed only on and macro algal, even sand has been increasing equal to 48.3 1% or 777.90 ha 630.70 ha in 1992 to 1408.60 ha in 2003, while macro algal has been : m a s i n g equal to 1.69% or 27.13 ha from 145.77 ha in 1992 to 172.90 ha in

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words: Coral reefs, change detection and remotely sensed data.

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