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Zonasi Geomorfologi dan Koreksi Kolom Air Untuk Pemetaan Substrat Dasar [PAPER]

ABSTRACT  Bias may occur on attenuation coefficient ratio estimated from water column correction method. This bias then contribute to t...



ABSTRACT 
Bias may occur on attenuation coefficient ratio estimated from water column correction method. This bias then contribute to thematic accuracy of bottom substrate images. This study used  eomorphologic spatial zonation to improve thematic accuracy of bottom substrate maps that produced from water column correction method.  Quickbird pixel values were converted to the top of atmosphere radiance and followed by water column correction to make bottom substrate map with three themes i.e. sand, seagrass and coral reef.  Field data were grouped using Bray Curtis method and become basis of image reclassification.  Geomorphological profile was extracted from green and red composite images, refer to a bathymetric survey. This combined method was significantly reach the thematic accuracy up to more than 80%.

Keywords : Quickbird, bottom subtrate, thematic accuracy

ABSTRAK 
Salah satu kelemahan metode koreksi kolom air adalah dapat memunculkan bias dalam estimasi rasio
koefisien atenuasi.  Bias ini berkontribusi pada nilai akurasi tematik peta substrat dasar. Studi ini menggunakan pendekatan zonasi geomorfologi untuk meningkatkan akurasi tematik peta substrat yang dihasilkan dari metode koreksi kolom air.  Nilai piksel citra Quickbird dikonversi ke radiansi dan dilanjutkan dengan koreksi kolom air untuk menghasilkan peta substrat dasar dengan tiga tema: substrat dominan pasir, lamun dan karang.  Data lapangan dikelompokkan menggunakan metode Bray curtis dan menjadi dasar bagi reklasifikasi.  Profil geomorfologi dicitra disadap dari gabungan kanal hijau dan merah, mengacu pada hasil survei batimetri. Akurasi tematik metode kombinasi ini dapat mencapai lebih dari 80%.

Kata kunci: Quickbird, substrat dasar, akurasi tematik

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RSGIS INDONESIA: Zonasi Geomorfologi dan Koreksi Kolom Air Untuk Pemetaan Substrat Dasar [PAPER]
Zonasi Geomorfologi dan Koreksi Kolom Air Untuk Pemetaan Substrat Dasar [PAPER]
https://1.bp.blogspot.com/-XqhTtQzlmXM/XTqfnlqXPQI/AAAAAAAAB58/WtsMEEuDdEUOhMPiabSf_Xe8xZ5CpAKwACLcBGAs/s640/Untitled.jpg
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RSGIS INDONESIA
https://www.rsgis.info/2019/07/zonasi-geomorfologi-dan-koreksi-kolom-air-untuk-pemetaan-substrat-dasar.html
https://www.rsgis.info/
https://www.rsgis.info/
https://www.rsgis.info/2019/07/zonasi-geomorfologi-dan-koreksi-kolom-air-untuk-pemetaan-substrat-dasar.html
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