Abstract:<h4>Peran dan manfaat ekosistem lamun secara ekologis merupakan hal yang harus diamati secara terperinci, terlebih potensi kerusakan yang dapat terjadi. Pemantauan kondisi ekosistem tersebut dapat dilakukan dengan memanfaatkan teknologi penginderaan jauh. Dalam penelitian ini, algoritma Lyzenga digunakan untuk mengolah nilai piksel yang ada pada citra satelit Landsat-8 dan Sentinel-2. Aplikasi algoritma Lyzenga akan menghasilkan nilai yang menunjukkan identitas dari objek yang terdapat di perairan pesisi… Show more
“…Satelite data using Sentinel-2A which is a polar-orbit satellite launched by European Space Agency (ESA). Sentinel-2A has 13 bands with a spatial resolution of 10 m and 20 m and acquisition from the website of https://scihub.copernicus.eu/dhus/ (Yanuar et al, 2018) . Field variable measured are seagrass species, density, chlorophyll-a, biomass and carbon.…”
Chlorophyll-a in seagrass biomass is functioned for the photosynthetic process and store the organic carbon in their biomass of the leaf, rhizome, and root. Ecologically has functioned as blue carbon in reducing global warming adaptation and mitigation strategy. The study aimed to explore seagrass species, chlorophyll-a content, biomass and carbon stock at Karimunjawa Island. Develop algorithms of the Sentinel-2A satellite data based on field seagrass chlorophyll-a, biomass and carbon and at Pokemon and Bobby beach Karimunjawa Island. Four species of seagrass found at Bobby and Pokemon beach are Holodule pinifolia with a density of 160.44 ind.m−2 , Enhalus acoroides with 26.22 ind.m−2, Halophila ovalis with 6.67 ind.m−2 and Thalassia hemprichii with 4.44 ind.m−2.The lowest seagrass chlorophyll-a is 5.854 mg.ml−1 found in H. pinifolia and the highest is 20.819 mg.ml−1found in E. acoroides at Pokemon beach. The range of seagrass chlorophyll-a at Bobby beach was 3.485 - 14.133 mg.ml−1 in T. hemprichii. The smallest individual biomass dry weight was found in T.hempirichii with 1.32 g.dry.weight per individu, and the biggest in E.acoroides with 6.98 g.dry.weight per individu. The highest seagrass biomass at Pokemon beach was in E. acoroides with 236.93 g.m−2 which has a wide leaf morphology and the lowest in H. pinifolia with 75.91 g.m−2 with the smallest leaf morphology. The range of seagrass biomass at Bobby beach is 97.62 - 264.48 g.m−2 which is dominated by T.hempirichii. The range of seagrass carbon was 109.63 - 136.82 gC.m−2at Pokemon beach, and in the range of 95.00 - 114.01 gC.m−2 at Bobby beach. Algorithm of seagrass chlorophyll-a = -36.308 (B3/B4)2 – 140.41(B3/B4) + 83.912 ; biomass = -7028.3 (B3/B4)2 + 14948 (B3/B4) – 7764.4; carbon = -17.529(B2/B3)2 + 143.82(B2/B3) – 5.3362 for Pokemon beach. Algorithm of chlorophyll-a = 455.02 (B2/B4)2 + 823.72 (B2/B4) + 375.48; biomass = -14699 (B3/B2)2 + 28395(B3/B2) – 13537; and carbon = - 0.001(B3/B4)2+ 0.209(B3/B4) - 10.203 for Bobby beach. The use of Band-2 (0.490 ????m), Band-3 (0.560 ????m) and Band-4 (0.665 ????m) Sentinel-2A satellite data in the development of seagras chlorophyll-a, biomass and carbon algorithm was found to be significant.
“…Satelite data using Sentinel-2A which is a polar-orbit satellite launched by European Space Agency (ESA). Sentinel-2A has 13 bands with a spatial resolution of 10 m and 20 m and acquisition from the website of https://scihub.copernicus.eu/dhus/ (Yanuar et al, 2018) . Field variable measured are seagrass species, density, chlorophyll-a, biomass and carbon.…”
Chlorophyll-a in seagrass biomass is functioned for the photosynthetic process and store the organic carbon in their biomass of the leaf, rhizome, and root. Ecologically has functioned as blue carbon in reducing global warming adaptation and mitigation strategy. The study aimed to explore seagrass species, chlorophyll-a content, biomass and carbon stock at Karimunjawa Island. Develop algorithms of the Sentinel-2A satellite data based on field seagrass chlorophyll-a, biomass and carbon and at Pokemon and Bobby beach Karimunjawa Island. Four species of seagrass found at Bobby and Pokemon beach are Holodule pinifolia with a density of 160.44 ind.m−2 , Enhalus acoroides with 26.22 ind.m−2, Halophila ovalis with 6.67 ind.m−2 and Thalassia hemprichii with 4.44 ind.m−2.The lowest seagrass chlorophyll-a is 5.854 mg.ml−1 found in H. pinifolia and the highest is 20.819 mg.ml−1found in E. acoroides at Pokemon beach. The range of seagrass chlorophyll-a at Bobby beach was 3.485 - 14.133 mg.ml−1 in T. hemprichii. The smallest individual biomass dry weight was found in T.hempirichii with 1.32 g.dry.weight per individu, and the biggest in E.acoroides with 6.98 g.dry.weight per individu. The highest seagrass biomass at Pokemon beach was in E. acoroides with 236.93 g.m−2 which has a wide leaf morphology and the lowest in H. pinifolia with 75.91 g.m−2 with the smallest leaf morphology. The range of seagrass biomass at Bobby beach is 97.62 - 264.48 g.m−2 which is dominated by T.hempirichii. The range of seagrass carbon was 109.63 - 136.82 gC.m−2at Pokemon beach, and in the range of 95.00 - 114.01 gC.m−2 at Bobby beach. Algorithm of seagrass chlorophyll-a = -36.308 (B3/B4)2 – 140.41(B3/B4) + 83.912 ; biomass = -7028.3 (B3/B4)2 + 14948 (B3/B4) – 7764.4; carbon = -17.529(B2/B3)2 + 143.82(B2/B3) – 5.3362 for Pokemon beach. Algorithm of chlorophyll-a = 455.02 (B2/B4)2 + 823.72 (B2/B4) + 375.48; biomass = -14699 (B3/B2)2 + 28395(B3/B2) – 13537; and carbon = - 0.001(B3/B4)2+ 0.209(B3/B4) - 10.203 for Bobby beach. The use of Band-2 (0.490 ????m), Band-3 (0.560 ????m) and Band-4 (0.665 ????m) Sentinel-2A satellite data in the development of seagras chlorophyll-a, biomass and carbon algorithm was found to be significant.
“…The user accuracy value is an accuracy value that shows the right classification class based on the field data and the producer accuracy value is the accuracy value in the classified class from the classification results [31]. While the overall accuracy value is an overall picture of the error rate of image data processing that is applied, where the closer to the maximum value, the smaller the error data generated [32][33]. Table 8 shows the results of the calculation of the accuracy-test using the confusion matrix method for the classification of Sentinel-2 images in 2019 and Unmanned Surface Vehicle field data.…”
Section: Accuracy Testmentioning
confidence: 99%
“…For example, the producer accuracy value is influenced by the calculation factor of the Lyzenga algorithm, while the user accuracy value is influenced by the input or calculation process. In addition, factors such as training samples, correction process, spatial resolution, GPS accuracy also affect the accuracy value obtained [32]. Please explain why such things have influenced the result of the accuracy test.…”
Today, the area of seagrass ecosystems in Indonesia is estimated to have shrunk significantly. Bintan Island has quite a large seagrass ecosystems area. Along with the development of satellite technology, monitoring of conditions and changes to a coastal ecosystem can be carried out effectively through remote sensing technology. One satellite image that is relatively new and has good spatial quality is Sentinel-2 with a spatial resolution value of 10×10 m2 / pixel. Field data retrieval is facilitated by the use of Unmanned Surface Vehicle (USV). This research went through several stages such as image pre-processing, water column correction, masking, unsupervised classification, and detection of changes of seagrass area. The data obtained from the USV becomes the data for the accuracy-test in the supervised classification. Seagrass area was obtained in Beralas Pasir and Beralas Bakau Island is 84.27 ha (2016), 81.3 ha (2019) and 77.4 ha (2021). Detection of seagrass to non-seagrass area changes resulting 31.35 ha (2016-2019) and 30.91 ha (2019-2021). On the other hand non-seagrass to seagrass area is 24.84 ha (2016-2019) and 27.98 ha (2019-2021). The accuracy test of 2019 image classification and Unmanned Surface Vehicle data resulting overall accuracy at 62.20%.
“…Waktu pengolahan citra Sentinel-2 sedikit lebih lama dari Landsat 8 tetapi lebih cepat dibandingkan SPOT 7. Resolusi pada citra Landsat 8 dan Sentinel-2 termasuk menengah karena memiliki resolusi 30 m dan 15 m, sedangkan SPOT 7 merupakan citra yang memiliki resolusi tinggi yaitu 6 m. Hal ini sesuai dengan pengelompokkan resolusi spasial (Yanuar et al 2018) sebagai berikut: 30m -1.000 m (resolusi rendah), 5 -30 m (resolusi menengah), dan 0,4 -5 m (resolusi tinggi). Menurut Oktaviani dan Johan (2016) waktu pengolahan citra Sentinel-2 hampir sama dengan citra Landsat 8 karena keduanya tidak memakan waktu lama, tetapi untuk citra SPOT 7 cukup lama karena memiliki resolusi tinggi sehingga membutuhkan ruang data yang lebih besar Biaya Sentinel-2 sama dengan Landsat 8 karena keduanya bisa didapatkan secara gratis, berbeda dengan SPOT 7 yang membutuhkan biaya yang cukup mahal untuk mendapatkannya.…”
Teknologi penginderaan jauh dan sistem informasi geografis selalu berkembang dan telah menghasilkan berbagai jenis citra yang direkam dengan berbagai sensor (multisensor). Penelitian ini bertujuan untuk membandingkan efektivitas dan efisiensi citra satelit Landsat-8, Sentinel-2, dan SPOT 7 yang digunakan dalam pemetaan tutupan lahan Hutan Pendidikan Konservasi Terpadu (HPKT) Tahura Wan Abdul Rachman (Tahura WAR). Metode yang digunakan adalah metode Analytical Hierarchy Process (AHP) dan perbandingan parameter. Nilai bobot dan skor AHP masing-masing parameter (waktu, biaya, ketersediaan citra, akurasi dan proses pengolahan) didapatkan dari hasil wawancara dengan ahli atau praktisi pengguna citra satelit, sedangkan perbandingan parameter dianalisis dengan studi literatur dan perhitungan manual. Hasil penelitian menunjukkan bahwa citra yang paling efektif dan efisien adalah citra Sentinel-2. Citra tersebut tergolong sangat baik ditinjau dari segi biaya, akurasi, proses pengolahan dan resolusi yang dimilikinya.Kata kunci: Analytical Hierarchy Process, citra satelit, sistem informasi geografis, Tahura WAR, tutupan lahan
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