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Estimasi Cadangan Karbon Mangrove Menggunakan Citra Sentinel-2A di Desa Banjarsari Pulau Enggano
Get PDFGlobal climate change remains one of the major challenges of the 21st century, and mangrove ecosystems play a crucial role as blue carbon sinks, helping mitigate greenhouse gas emissions. However, data on mangrove carbon stocks in Indonesia’s outermost islands, such as Enggano Island, are still limited. This study aims to estimate the aboveground carbon stock of mangrove forests in Banjarsari Village, Enggano District, by integrating field measurements and Sentinel-2A imagery. Biomass was calculated using an allometric approach, while spatial carbon estimation was derived from the Normalized Difference Vegetation Index (NDVI). The results show that the mangrove area covers approximately 193,25 ha, dominated by dense vegetation (98%) with NDVI values ranging from −0.5 to 0.94. The dominant species were Rhizophora apiculata. The total above-ground carbon stock was estimated at 44,276.78 tons C. The regression between NDVI and carbon stock produced the equation y = 2.1402x − 185.36, with a coefficient of determination (R²) of 0.48 and an RMSE of 161,14 tons/ha. These findings demonstrate the significant carbon storage capacity of Enggano’s mangrove ecosystem and highlight its crucial role in supporting climate change mitigation and low-carbon development in Indonesia’s remote coastal regions. Perubahan iklim global menjadi tantangan utama abad ini, dan ekosistem mangrove berperan penting sebagai penyerap karbon biru (blue carbon) yang efektif dalam menekan emisi gas rumah kaca. Namun, informasi mengenai stok karbon mangrove di wilayah kepulauan terluar Indonesia, seperti Pulau Enggano, masih sangat terbatas. Penelitian ini bertujuan mengestimasi cadangan karbon mangrove bagian atas di Desa Banjarsari, Kecamatan Enggano, melalui integrasi data lapangan dan citra Sentinel-2A. Biomassa dihitung menggunakan pendekatan alometrik, sedangkan estimasi spasial karbon diperoleh melalui analisis indeks vegetasi NDVI. Hasil penelitian menunjukkan bahwa luas ekosistem mangrove mencapai 193,25 ha dengan dominasi kerapatan rapat (98%) dan nilai NDVI berkisar antara −0,5 hingga 0,94. Spesies dominan yang ditemukan adalah Rhizophora apiculata. Total cadangan karbon diperkirakan mencapai 44.276,78 ton C. Hubungan antara NDVI dan stok karbon menunjukkan persamaan regresi y = 2,1402x − 185,36 dengan koefisien determinasi (R²) sebesar 0,48 dan RMSE 161,14 ton/ha. Hasil ini menegaskan bahwa ekosistem mangrove Enggano memiliki potensi besar sebagai penyerap karbon, sekaligus berkontribusi terhadap upaya mitigasi perubahan iklim dan kebijakan pembangunan rendah karbon di wilayah pesisir terpencil Indonesia
APLIKASI TEKNOLOGI PENGINDERAAN JAUH DALAM PENDUGAAN ESTIMASI CADANGAN KARBON MANGROVE BAGIAN ATAS MENGGUNAKAN CITRA SENTINEL-2A DI DESA BANJARSARI KECAMATAN ENGGANO
No full textPerubahan iklim global menjadi tantangan utama abad ini, dan ekosistem mangrove
berperan vital sebagai penyerap karbon biru (blue carbon) yang efektif dalam menekan
emisi gas rumah kaca. Namun, informasi mengenai stok karbon mangrove di wilayah
kepulauan terluar Indonesia, seperti Pulau Enggano, masih sangat terbatas. Penelitian ini
bertujuan mengestimasi cadangan karbon mangrove bagian atas di Desa Banjarsari,
Kecamatan Enggano, melalui integrasi data lapangan dan citra Sentinel-2A. Biomassa
dihitung menggunakan pendekatan alometrik, sedangkan estimasi spasial karbon
diperoleh melalui analisis indeks vegetasi NDVI. Hasil penelitian menunjukkan bahwa
luas ekosistem mangrove mencapai 193,25 ha dengan dominasi kerapatan rapat (98%)
dan nilai NDVI berkisar antara 0,1 hingga 0,94. Spesies dominan yang ditemukan adalah
Rhizophora apiculata. Total cadangan karbon diperkirakan mencapai 44.276,78 ton C.
Hubungan antara NDVI dan stok karbon menunjukkan persamaan regresi y =
0,2265x+176,57dengan koefisien determinasi (R²) sebesar 0,48 dan RMSE 161,14
ton/ha. Hasil ini menegaskan bahwa ekosistem mangrove Enggano memiliki potensi
besar sebagai penyerap karbon, sekaligus berkontribusi terhadap upaya mitigasi
perubahan iklim dan kebijakan pembangunan rendah karbon di wilayah pesisir terpencil
Indonesia
Kata Kunci: Mangrove, karbon, Sentinel 2
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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