Indrastata, Vania Aristawati (2026) Pengaruh Koreksi Sun Glint terhadap Akurasi Estimasi Kedalaman Laut dengan Algoritma Lyzenga pada Citra Sentinel-2 (Studi Kasus: Pekalongan, Jawa Tengah). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Informasi kedalaman perairan dangkal merupakan salah satu data penting dalam pengelolaan wilayah pesisir, seperti untuk keperluan navigasi, pemetaan, dan monitoring lingkungan laut. Namun, pengukuran kedalaman secara langsung melalui survei lapangan membutuhkan waktu, biaya, dan tenaga yang relatif besar. Oleh karena itu, pemanfaatan citra satelit melalui metode Satellite Derived Bathymetry (SDB) menjadi salah satu alternatif yang efisien untuk mengestimasi kedalaman perairan dangkal. Meskipun demikian, akurasi estimasi kedalaman dari citra satelit dapat dipengaruhi oleh gangguan pada permukaan air, salah satunya adalah fenomena sun glint, yaitu pantulan cahaya matahari pada permukaan air yang dapat mengganggu informasi spektral objek perairan. Penelitian ini bertujuan untuk mengetahui pengaruh koreksi sun glint terhadap kualitas citra Sentinel-2 yang digunakan untuk pemanfaatan SDB, mengetahui hasil estimasi kedalaman sebelum dan sesudah koreksi sun glint, serta membandingkan akurasi kedalaman hasil estimasi terhadap data kedalaman in-situ. Penelitian dilakukan di perairan Pekalongan, Jawa Tengah, dengan menggunakan data citra Sentinel-2 dan data kedalaman in-situ. Metode yang digunakan adalah Satellite Derived Bathymetry (SDB) menggunakan algoritma Lyzenga. Hasil penelitian menunjukkan bahwa koreksi sun glint memberikan perubahan pada karakter visual dan statistik reflektansi citra, yang ditunjukkan oleh perbedaan rona, tekstur, serta penurunan nilai minimum, maksimum, dan median reflektansi pada Band 2, Band 3, dan Band 4. Namun, nilai standar deviasi pada citra terkoreksi dan tanpa koreksi relatif sama, sehingga koreksi sun glint pada penelitian ini belum menunjukkan pengaruh yang signifikan dalam mengurangi variasi piksel yang berkaitan dengan noise permukaan air. Estimasi kedalaman pada citra terkoreksi sun glint (Citra A) menghasilkan rentang kedalaman 3,6466–7,5833 meter, sedangkan citra tanpa koreksi sun glint (Citra B) menghasilkan rentang 4,4493–8,2146 meter. Hasil uji akurasi menunjukkan bahwa citra terkoreksi sun glint (Citra A) memberikan hasil yang lebih baik, dengan nilai R² sebesar 0,7427 dan RMSE sebesar 0,5204 meter, dibandingkan citra tanpa koreksi yang memiliki nilai R² sebesar 0,6773 dan RMSE sebesar 0,5819 meter. Dengan demikian, citra terkoreksi sun glint lebih mampu merepresentasikan variasi kedalaman perairan dangkal terhadap data in-situ.
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Shallow water depth information is an important dataset for coastal area management, including navigation, mapping, and marine environmental monitoring. However, direct depth measurement through field surveys requires considerable time, cost, and effort. Therefore, the use of satellite imagery through the Satellite Derived Bathymetry (SDB) method has become an efficient alternative for estimating shallow water depth. Nevertheless, the accuracy of depth estimation from satellite imagery can be affected by disturbances on the water surface, one of which is the sun glint phenomenon, namely the reflection of sunlight on the water surface that can interfere with the spectral information of aquatic objects. This study aims to determine the effect of sun glint correction on the quality of Sentinel-2 imagery used for SDB applications, to identify the depth estimation results before and after sun glint correction, and to compare the accuracy of the estimated depths with in-situ depth data. The study was conducted in the waters of Pekalongan, Central Java, using Sentinel-2 imagery and in-situ depth data. The method employed was Satellite Derived Bathymetry (SDB) using the Lyzenga algorithm. The results showed that sun glint correction caused changes in the visual characteristics and reflectance statistics of the imagery, as indicated by differences in tone, texture, and decreases in the minimum, maximum, and median reflectance values in Bands 2, 3, and 4. However, the standard deviation values of the corrected and uncorrected imagery were relatively similar, indicating that sun glint correction in this study did not show a significant effect in reducing pixel variation associated with water surface noise. Depth estimation from the sun glint-corrected imagery (Image A) produced a depth range of 3.6466–7.5833 meters, while the uncorrected imagery (Image B) produced a range of 4.4493–8.2146 meters. Accuracy assessment results showed that the sun glint-corrected imagery (Image A) performed better, with an R² value of 0.7427 and an RMSE of 0.5204 meters, compared to the uncorrected imagery which had an R² value of 0.6773 and an RMSE of 0.5819 meters. Therefore, the sun glint-corrected imagery was better able to represent variations in shallow-water depth compared with the in-situ data.
| Item Type: | Thesis (Other) |
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| Uncontrolled Keywords: | Koreksi Sun Glint, Marin Optik, Perairan Dangkal, Satellite Derived Bathymetry (SDB), Survei Batimetri, Bathymetric Survey, Optic Marine, Satellite Derived Bathymetry (SDB), Shallow Water, Sun Glint Correction. |
| Subjects: | G Geography. Anthropology. Recreation > GC Oceanography |
| Divisions: | Faculty of Civil Engineering and Planning > Geomatics Engineering > 29202-(S1) Undergraduate Thesis |
| Depositing User: | Vania Aristawati Indrastata |
| Date Deposited: | 22 Jul 2026 04:39 |
| Last Modified: | 22 Jul 2026 04:39 |
| URI: | http://repository.its.ac.id/id/eprint/136467 |
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