Oil spill is a great threat for marine ecosystem. Oil discharge has become a public concern in all over the world with the increase of marine traffics. Indonesian government has declared state of emergency over oil spill which devastated Balikpapan bay in March 2018. The deadly oil spill impacts marine ecosystem as well as the communities. This study aims to map the oil spill over Balikpapan bay by utilising SAR imagery of Sentinel-1. Automatic and semi-automatic approaches are presented in this study to detect the oil spill. Oil spill is automatically detected using Oil Spill Detection toolbox of Sentinel Application Platform (SNAP). Furthermore, semi-automatic method is also demonstrated by utilising pre and post-oil spill SAR imageries. Our experiment shows that semi-automatic method has better performance than automatic detection by SNAP. Nevertheless, both approaches are useful to map oil spill in term of time and cost effectiveness.
Satellite-Derived Bathymetry (SDB) merupakan salah satu teknik dalam penginderaan jauh untuk penyediaan data kedalaman perairan dangkal menggunakan citra satelit. Pada citra, kisaran panjang gelombang 450 hingga 580 nm memiliki kemampuan menembus perairan dengan cukup baik dibandingkan dengan panjang gelombang yang lain. Penelitian ini bertujuan untuk mengetahui pengaruh resolusi spasial dalam estimasi kedalaman khususnya dengan algoritma Stumpf menggunakan panjang gelombang tampak. Studi ini dilakukan menggunakan citra Worldview 3 dan Sentinel 2A di Kepulauan Karimunjawa, Jawa Tengah. Hasil dari penelitian ini menunjukkan bahwa model kedalaman terbaik pada citra Worldview 3 dan Sentinel 2A yaitu dengan nilai y=0,8847x + 0,2204 dan R2 sebesar 0,7135 dan y=0,858x + 0,3123 dan R2 sebesar 0,6974. Panjang gelombang tampak dengan band ratio Hijau-Biru pada citra Worldview 3 dan Sentinel 2A menghasilkan kedalaman terbaik pada rentang kedalaman 0-5 m yang ditunjukkan dengan nilai RMSE sebesar 1,526 dan 1,558 m. Dari penelitian ini, dapat disimpulkan bahwa citra satelit resolusi tinggi menghasilkan nilai RMSE yang cenderung lebih kecil dibandingkan dengan citra resolusi sedang.
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