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METODE DUAL KANAL UNTUK ESTIMASI KEDALAMAN DI PERAIRAN DANGKAL MENGGUNAKAN DATA SPOT 6 STUDI KASUS : TELUK LAMPUNG (DUAL BAND METHOD FOR BATHYMETRY ESTIMATION IN SHALLOW WATERS DEPTH USING SPOT 6 DATA CASE STUDY: LAMPUNG BAY) Muchlisin Arief; Syifa Wismayati Adawiah; Ety Parwati; Sartono Marpaung
Jurnal Penginderaan Jauh dan Pengolahan Data Citra Digital Vol. 14 No. 1 Juni 2017
Publisher : Indonesian National Institute of Aeronautics and Space (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1004.554 KB) | DOI: 10.30536/j.pjpdcd.2017.v14.a2618

Abstract

Depth data can be used to produce seabed profile, oceanography, biology, and sea level rise. Remote sensing technology can be used to estimate the depth of shallow marine waters characterized by the ability of light to penetrate water bodies. One image that can estimate the depth is SPOT 6 which has three visible canals and one NIR channel with 6 meter spatial resolution. This study used SPOT 6 image on March 22, 2015. The image was first being  dark pixel atmospheric corrected by making 30 polygons. The originality of this method was to build a correlation between the dark pixel value of red and green channels with the depth of the field measurement results, made on June 3 to 9, 2015. The algorithm  derived experimentally consisted of: thresholding which served to separate the land by the sea and the correlation function. The correlation function was obtained: first correlating the observation value with each band, then calculating the difference of minimum pixel darkness value and minimum for red and green channel was 0.056 and 0.0692. The model was then constructed by using the comparison proportions, so that the linear equations were obtained in two channels: Z (X1, X2) = 406.26 X1 + 327.21 X2 - 28.48. Depth estimation results were for a 5-meter scale, the most efficient estimation with the smallest error relative mean occured in shallow water depth from 20 to 25 meters, while the result of   10 meters scale from 20 to 30 meters and the estimated depth hadsimilar patterns or could be said close to reality. This method was able to detect sea depths up to 25 meters and had a small RMS error of 0.653246 meters. Thus the two-channel method coukd offer a fast, flexible, efficient, and economical solution to map topography of the ocean floor.AbstrakData kedalaman dapat digunakan untuk menghasilkan profil dasar laut, oseanografi, biologi, dan kenaikan muka air laut. Teknologi penginderaan jauh dapat digunakan untuk mengestimasi kedalaman perairan laut dangkal yang ditandai dengan kemampuan cahaya untuk menembus badan air. Salah satu citra yang mampu mengestimasi kedalaman tersebut adalah SPOT 6 yang memiliki tiga kanal visible dan satu kanal NIR dengan resolusi spasial 6 meter. Pada penelitian ini, Citra SPOT-6 yang digunakan adalah 22 Maret 2015. Citra terlebih dahulu dilakukan koreksi atmosferik dark pixel dengan membuat 30 poligon. Originalitas dari metode ini adalah membangun suatu korelasi antara nilai dark pixel kanal merah dan hijau dengan nilai kedalaman hasil pengukuran lapangan yang dilakukan pada 3 sampai dengan 9 Juni 2015. Algoritma diturunkan secara eksperimen yang terdiri dari thresholding yang berfungsi untuk memisahkan daratan dengan lautan dan fungsi korelasi. Fungsi korelasi diperoleh pertama-tama mengkorelasikan nilai pengamatan dengan masing-masing band, kemudian menghitung selisih nilai dark pixel maksimum dan minimum untuk kanal merah dan hijau yaitu 0,056 dan 0,0692. Selanjutnya, dibangun model dengan menggunakan dalil perbandingan sehingga diperoleh persamaan linier dalam dua kanal yaitu: Z(X1,X2) = 406,26 X1 + 327,21 X2 – 28,48. Hasil estimasi kedalaman, untuk skala 5 meter, estimasi yang paling efisien dengan Mean relatif error terkecil terjadi pada kedalaman perairan dangkal dari 20 sampai dengan 25 meter, sedangkan untuk skala 10 meter dari 20 sampai dengan 30 meter dan juga hasil estimasi kedalaman yang diperoleh mempunyai pola kemiripan atau dapat dikatakan mendekati kenyataan. Metode ini mampu mendeteksi kedalaman laut hingga 25 meter dan mempunyai RMS error yang kecil yaitu 0,653246 meter. Dengan demikian, metode dua kanal ini dapat menawarkan solusi cepat, fleksibel, efisien, dan ekonomis untuk memetakan topografi dasar laut.
METODE PENENTUAN TITIK KOORDINAT ZONA POTENSI PENANGKAPAN IKAN PELAGIS BERDASARKAN HASIL DETEKSI TERMAL FRONT SUHU PERMUKAAN LAUT Rossi Hamzah; Sartono Marpaung; Teguh Prayogo
Jurnal Penginderaan Jauh dan Pengolahan Data Citra Digital Vol. 13 No. 2 Desember 2016
Publisher : Indonesian National Institute of Aeronautics and Space (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (989.184 KB) | DOI: 10.30536/j.pjpdcd.2016.v13.a2364

Abstract

Information points coordinate of potential fishing zones (PFZ) is required by user that to be more effective in conducting fishing operation. The results of thermal front detection using single image edge detection (SIED) asshape contour lines. This research aims to determine points coordinate for potential fishing zone based on detection of thermal fronts sea surface temperatures.To determine point coordinate performed segmentation on detection result according to size fishnet grid. Contour line contained in each grid is a polygon shape.Centroid of each polygon is point coordinate of PFZ. The result of sea surface temperature data processing from Terra/Aqua MODIS and Suomi NPP VIIRS satellitesindicates that method of determination the centroid of polygon is very effective in determining the point coordinate of PFZ. Using that method the processing stages of satellite data to be faster, more efficient and practical due to the information of PFZ is already as points coordinate.Abstrak Informasi titik koordinat zona potensi penangkapan ikan (ZPPI) sangat diperlukan oleh pengguna agar lebih efektif dalam melakukan operasi penangkapan ikan. Hasil deteksi termal front menggunakan metode Single Image Edge Detection (SIED) dalam bentuk garis kontur. Penelitian ini bertujuan untuk menentukan titik koordinat ZPPI berdasarkan hasil deteksi termal front suhu permukaan laut. Untuk menentukan titik koordinat dilakukan segmentasi hasil deteksi sesuai ukuran fishnet grid. Garis kontur yang terdapat dalam setiap grid merupakan bentuk poligon. Pusat geometri dari setiap poligon merupakan titik koordinat ZPPI. Hasil pengolahan data suhu permukaan laut dari satelit Terra/Aqua MODIS dan Suomi NPP VIIRS menunjukkan bahwa metode penentuan pusat geometri poligon sangat efektif dalam menentukan titik koordinat ZPPI. Dengan menggunakan metode tersebut tahap pengolahan data satelit menjadi lebih cepat, efisien dan lebih praktis karena informasi ZPPI sudah dalam bentuk titik koordinat.
ANALYSIS OF SEA SURFACE HEIGHT ANOMALY CHARACTERISTICS BASED ON SATELLITE ALTIMETRY DATA (CASE STUDY: SEAS SURROUNDING JAVA ISLAND) Sartono Marpaung; Wawan K. Harsanugraha
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 11, No 2 (2014)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1367.718 KB) | DOI: 10.30536/j.ijreses.2014.v11.a2611

Abstract

Sea surface height anomaly is a oceanographic parameter that has spatial and temporal variability. This paper aims to determine the characters of sea surface height anomaly in the south and north seas of Java Island. To find these characters, a descriptive analysis of monthly anomaly data is performed spatially, zonally and temporally. Based on satellite altimetry data from 1993 to 2010, the analysis shows that the average of sea surface height anomaly varies, ranging from -15 cm to 15 cm. Spatially and zonally, there are three patterns that can be concidered as sea surface height anomaly characteristics: anomaly is higher in coastal areas than in open seas, anomaly is lower in coastal areas than in open seas and anomaly in coastal area is almost the same as in open seas. The first and second patterns occur in the south and north seas of Java Island. The third pattern occurs simultaneously in south and north seas of Java Island. Characteristics of temporal anomaly have a sinusoidal pattern in south and north seas of Java Island.
ANALISIS KARAKTERISTIK NET PRIMARY PRODUCTIVITY DAN KLOROFIL-A DI LAUT BANDA DAN SEKITARNYA Sartono Marpaung; Teguh Prayogo; Emi Yati; Anang Dwi Purwanto; M. Rizki Nandika; Dede Dirgahayu Domiri; Dony Kushardono
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 14 No. 1 (2022): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.v14i1.36757

Abstract

Net primary productivity (NPP) and chlorophyll-a (Chl-a) are indicators of water productivity. In this study, an analysis of NPP and Chl-a characteristics in the Banda Sea was carried out using the Hovmöller diagram and Pearson’s correlation. The NPP data used comes from VGPM and Chl-a from Aqua MODIS satellite. The results of data analysis from January 2003-December 2020, NPP and Chl-a reached highest concentrations in dry season and lowest in wet season. For monthly data, the highest concentrations occurred in August and the lowest in April and December. The waters of the Banda Sea include mesotrophic waters with monthly average of NPP 429 mg C/m2/day and Chl-a 0.24 mg/m3. During La Niña and El Niño, there was a change (decrease/increase) the concentration of NPP and Chl-a in dry season and transition period II. NPP and Chl-a have a high correlation and a strong linear relationship. NPP and Chl-a have almost the same pattern/tendency temporally. The change of NPP concentration temporally corresponded to change of Chl-a concentration. Seasonal factors, La Niña and El Niño have a strong influence in influencing the variability of NPP and Chl-a concentrations. High productivity based on NPP and Chl-a didn’t affect for skipjack and tuna seasons (big pelagic), that occurs in wet season and transition period II. High productivity affects to flying fish season (small pelagic) that occurs in dry season.