Estimating number of trees with field plots located in remote or inaccessible areas can be a costly and timely endeavor. Unmanned aerial vehicle (UAV) remote sensing allowing for the estimation of the forest vegetation offers an alternative to traditional ground-based forest measurements. It is an important supplement to traditional aerial and satellite remote sensing due to its flexible, fast and cost-effective capability for acquiring very high spatial resolution imagery. In this study, we explored the application of UAV to monitoring mangrove forests in Margasari Lampung Indonesia. Using the UAV, we collected aerial photos of the Margasari mangrove area. The adaptive thresholding and contour extraction methods were applied to measure the number of trees of the mangrove forest.
Aplikasi Mission Planner merupakan salah satu aplikasi Ground Control Station yang bersifat open-source. Aplikasi Mission Planner dibangun oleh Michael Oborne dan menjadi aplikasi GCS yang paling umum digunakan. Aplikasi Mission Planner digunakan untuk mengontrol serta memonitoring misi penerbangan. Aplikasi ini juga dapat menerima serta mengirim perintah data penerbangan. Dalam melakukan misi penerbangan, aplikasi Mission Planner dioperasikan oleh operator GCS. Dalam mengoperasikan Mission Planner, akan lebih baik jika tampilan aplikasi disesuaikan dengan kebutuhan operator. Oleh karena itu, dilakukan pengembangan tampilan aplikasi Mission Planner yang sesuai dengan kebutuhan. Sehingga diharapkan dapat mempermudah operator GCS dalam mengoperasikan penerbangan. Penelitian ini mengembangkan tampilan dari aplikasi Mission Planner berbasis desktop. Pengembangan dilakukan dengan menggunakan Microsoft Visual Studio Community 2019 dengan bahasa pemrograman C#. Penelitian ini diuji coba dengan menggunakan fasilitas dari Laboratorium Teknik Digital.
Gunung Anak Krakatau is one of the active volcanoes in Indonesia. In October -December 2018, it erupted 156 times by releasing incandescent materials and toxic gases in the form of sulphur dioxide (SO2), carbon dioxide (CO2), and hydrogen sulphide (H2S) at 2 km radius. The release of SO2 gas indicates that magma is approaching the surface and puts the volcano on alert status. Finally on 22 December 2018 the continued eruption caused the flank collapse on some part of the volcano, triggered a tsunami that stroke the coastal of Lampung and Banten. This work investigated the SO2 gas monitoring technology using Differential Optical Absorption Spectroscopy (DOAS). The study specifically concerns on the working principles of DOAS, optimization of DOAS with optical bandpass filters and amplifiers, as well as the implementation architecture design of DOAS from Gunung Anak Krakatau Volcano to Hargo Pancuran Monitoring Station. Based on this study, the DOAS can be used to monitor SO2 gas by using a catadioptric telescope and the optimization works for UG11 as an optical bandpass filter and Raman Amplifier as the amplifier.
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