No abstract

Mangrove forest is the most well known in Langsa City. Mangrove forest has high productivity and rich of biodiversity. However, the mangrove area has decreased in quantity. It caused by human activities (anthropogenic factors) and natural conditions. Aims of this research are to map the spatial distribution of mangrove forest in Langsa City, analyze the changes occurring mangrove area, and identify the factors that leading to the changes. Landsat 5 and Landsat 8 OLI images are selected to represent data with multi temporal images (1996, 2006, 2016, and 2018). This study used the maximum likelihood classification on multispectral data. The result of the research showed the accuracy of Landsat 8 OLI images in 2018 was 62.50%. Mangrove area changes during three periods of observed data, i.ehas decreased to 419.04 ha in 1996-2006, increase to 459.76 ha in 2006-2016, and decreased 330.57 ha in 2016-2018. These changes were generally caused by anthropogenic factors such as logging, garbage buildup, over function of mangrove to café, bridge and settlement. On the other hand, natural factors did not caused the change. Natural factors value in research location are accepted by mangrove growth requirements, i.e water pH was 7.8, temperature was 34°C, salinity was 33.03, and DO (Dissolved Oxygen) was 5.28.

Strategi pencegahan penyebaran covid-19 di tingkat satuan pendidikan wajib ditingkatkan. Hal ini untuk mengedukasi siswa menerapkan perilaku hidup bersih dan sehat karena anak-anak yang merupakan golongan rentan terpapar dan tertular Covid-19. Banyak lembaga pendidikan kewalahan dalam membuat pengawasan terhadap anak-anak untuk pencegahan penularan covid-19. Pengabdian masyarakat ini bertujuan memberikan strategi pencegahan virus covid-19 pada Sekolah Dasar di Kec. Pante Bidari, Aceh Timur. Kegiatan PKM ini dilakukan dengan memberikan teori dan strategi pencegahan virus covid-19 pada 4 (empat) Sekolah Dasar yaitu SDN Pante Panah, SDN Paya Demam Dua, SDN Lhoknibong, dan SDN Bandar Baru Kabupaten Aceh Timur. Metode yang digunakan dalam pengabdian ini adalah pendekatan kualitatif dengan jenis penelitian deskriptif. Subjek dalam pengabdian ini adalah guru kelas dan siswa di wilayah kabupaten Aceh Timur. Tahap pelaksanaan dilakukan dengan tiga tahapan, yaitu survei, koordinasi, dan monitoring dan evaluasi. Tahap pertama merupakan tahap persiapan. Pada tahap ini kelompok pengabdi melakukan survey pendahuluan untuk melihat kondisi di lapangan mengenai strategi pencegahan virus covid-19 pada sekolah dasar di Kec. Pante Bidari, Aceh Timur dihasilkan oleh masyarakat. Tahapan kedua strategi yang kreatif dan inovatif sebagai upaya pencegahan Covid-19. Tahap yang terakhir adalah tahap monitoring dan evaluasi. Pada tahap ini dilakukan evaluasi atas hasil yang telah dicapai oleh masyarakat. Berdasarkan hasil pengabdian, disosialisasikan sepuluh strategi pencegahan covid- 19, yaitu rajin mencuci tangan dengan benar, menggunakan hand sanitizer jika tidak ada air dan sabun,  menggunakan masker secara benar, menggunakan face shield, penyemprotan disinfektan, memberi vitamin sebagai imun booster, menggunakan tisu saat bersin dan batuk, menghindari bepergian selama pandemi, dan menghindari kontak langsung dengan orang lain.

One of the most attractive ecosystems to be used as tourist destinations is coral reefs. The coral reef ecosystem on Weh Island, Aceh, Indonesia is one of the coastal ecosystems that have a strategic role in ecological and economic development. One of the ecological and economic development efforts can be done through marine tourism. This study aims to analyze the distribution of coral reefs to develop marine tourism in Weh Island. This study uses Landsat 8 OLI image data and field observations. The technique used in this research is the image data analysis technique using multispectral classification. The results showed that the coral reefs on Weh Island in 2020 amounted to 13,136,000 Ha. Therefore, the development of marine tourism must create tourism zones to maintain the sustainability of coral reef ecosystems.

As one of the largest archipelagic countries globally, Indonesia has diverse natural resources, one of which is the coral reef ecosystem. Coral reef ecosystems are spread across almost all Indonesian waters, and Pulau Weh Sabang is one distribution area. This study aims to determine the distribution of coral reef ecosystems and test landsat 8 oli imagery accuracy in mapping coral reef ecosystems. The method used in this research is the nearest neighbour algorithm object-based classification method. The results showed that the coral reef ecosystem in Pulau Weh Sabang was divided into two classes: a healthy coral reef ecosystem class with 277.38 hectares and a medium condition coral reef ecosystem class with an area of 710.01 Ha.Keywords:Landsat 8 oliMappingDistributionCoral reefWeh Island