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.
Dalam bidang oseanografi beberapa fenomena laut dapat dilihat menggunakan peta Suhu Permukaan Laut (SPL). Selain SPL, kondisi pasang surut juga penting untuk diketahui karena menggambarkan karakteristik suatu perairan. Penelitian ini bertujuan untuk mengetahui variasi SPL dan karakteristik pasang surut di perairan pulau Bali, Indonesia. Data SPL diperoleh dari National Oceanic and Atmospheric Administration (NOAA) pada 2015 – 2017 dan data pasang surut diperoleh dari Badan Informasi Geospasial (BIG) pada bulan Juni 2017 dengan interval data satu jam. Dari hasil percobaan menggunakan metode Admiralty menunjukkan bahwa tipe pasang surut di perairan pulau Bali, Indonesia tergolong Campuran dengan kecendurungan Semi Diurnal dengan bilangan Formzahl sebesar 1.01 (0.25 < F £ 1.5). Kemudian parameter elevasi Highest High Water Level (HHWL) dan Lowest Low Water Level (LLWL) yang diperoleh dari perhitungan sebesar 1.0512 dan -1.0504 meter. Selanjutnya pengolahan data SPL menunjukkan pada Juni 2015 (Musim Kemarau) nilai SPL berkisar 24.05 – 29.11 oC dengan rata-rata sebesar 27.73 oC. Kemudian pada Desember 2016 (Musim Penghujan) nilai SPL berkisar 22.96 – 28.87 oC dengan rata-rata sebesar 27.00 oC. Selanjutnya pada Februari 2017 (Musim Penghujan) nilai SPL berkisar 23.36 – 30.4 oC dengan rata-rata sebesar 27.20 oC. Sehingga dapat disimpulkan bahwa SPL di perairan Pulau Bali pada musim penghujan cenderung lebih rendah dibandingkan musim kemarau. Secara umum wilayah bagian utara pulau Bali cenderung memiliki suhu lebih tinggi dibandingkan dengan perairan bagian selatan.
Satellite-Derived Bathymetry (SDB) is an alternative for obtaining shallow water depth data. The existence of images with various resolutions, the availability of a complete image band can develop the extraction results. This method is based on the principle of the satellite's visible band to estimate water depth. The mapping of shallow water depth is dependent on water conditions, both its brightness and surface. When the sensor senses a water object, the reflected reflection comes from the surface, and some sensors cannot penetrate the water object. The sun's position and the sensor's point of view when sensing it results in interference from the water surface (Sunglint). The sunglint effect on the image can be reduced by performing RGB band correction with NIR Infrared. This study aims to demonstrate the effect of Sunglint's correction on three SDB approaches, namely Thresholding, Rationing, and Mean Value on Worldview 3 imagery in Karimunjawa Islands, Central Java. This study's results indicate that the Sunglint correction on Worldview 3 imagery affects the depth extraction results. The best results are shown by Sunglint's correction using the Thresholding approach (B2-B7), which produces the best correlation with R2 of 0.7364 and (B7-B2) with R2 = 0.7351. Contrastingly, the lowest correlation was generated using the Mean Value ((B2 + B7) / 2) approach without Sunglint's correction with R2 = 0.4015. So this research proves that the Worldview 3 image with Sunglint correction can provide bathymetry data, especially in shallow waters.
Computerization has an essential role in the field of remote sensing. Various methods for automatic coastline analysis continue to develop. This study aims to determine the performance of three methods, namely Roberts' Filter, Segmentation, and Band Ratio on Landsat 8 imagery, in producing land edges that are directly adjacent to the sea area (coastline). This study shows that the non-fusion image, the resulting edge, is less sharp than the fused image in the Roberts' filter method. The use of a 2x2 matrix on the Roberts' filter, the range of values from 0.52 to 0.56 in the segmentation method, and the Green Band Ratio -Near-Infrared produce various accuracy. The best method is produced by Band Ratio, where the edge detection results are close to the image's actual conditions. Meanwhile, unsatisfactory results are produced by the segmentation method.
The objective of this research is to investigate employee satisfaction in one of Indonesian business firms named BM*. The study also tries to identify different factors influencing on employee satisfaction in the firm and to give appropriate suggestion for performance improvement. Methodology of this research is based on a survey and a questionnaire based on Human Resource Index (HRI) with measure 15 is used for the assessment. The results show that employee satisfaction of BM* was relatively high. However, some of the attributes show the HRI were low. The study gives some insight to improve the customer satisfaction.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.