Judul: Estimasi Evapotranspirasi Spasial Menggunakan Suhu Permukaan Darat (LST) Dari Data MODIS Terra/Aqua Dan Pengaruhnya Terhadap Kekeringan
Abstrak: Evapotranspirasi merupakan informasi penting dalam perkembangan bidang pertanian di Indonesia. Keterbatasan jumlah stasiun cuaca yang melakukan pengukuran mengenai evaporasi dan evapotranspirasi di Indonesia, merupakan salah satu penyebab kurang meratanya penelitian mengenai evapotranspirasi di Indonesia. Oleh karena itu penelitian ini dilakukan dengan tujuan untuk mengestimasi evapotranspirasi dari nilai suhu permukaan darat (LST), dan menganalisis adanya hubungan antara evapotanspirasi dengan kekeringan. Penggunaan metode penginderaan jauh dalam penelitian ini dilakukan untuk mengatasi keterbatasan data dari stasiun cuaca. Hasil yang diperoleh dari pendugaan evapotranspirasi menggunakan data Citra MODIS Terra/Aqua di Bogor nilainya berkisar antara 11.4 – 14.5 mm/8 hari, Indramayu berkisar 10.7 – 12.6 mm/8 hari, Malang berkisar antara 10.6 – 14.2 mm/8 hari dan Surabaya berkisar antara 11.3 – 12.2 mm/8 hari. Sedangkan nilai evapotranspirasi dari pengukuran lapang di Bogor berada pada kisaran 23.7 – 33.2 mm/8 hari, Indramayu berada di kisaran 22.8 – 32.4 mm/8 hari, Malang berada pada kisaran 21.5 – 31.4 mm/ 8 hari dan Surabaya berada pada kisaran 21.4 – 32.9 mm/8 hari. Dari hasil penelitian ini diketahui bahwa evapotranspirasi bukan merupakan satu – satunya unsur meteorologi yang mempengaruhi terjadinya kekeringan. Dan tinggi rendahnya evapotranspirasi dipengaruhi oleh beberapa faktor seperti topografi, keadaan atmosfer/cuaca (CH, kelembaban, suhu, angin, dll). Nilai keeratan antara LST dengan ETp lebih tinggi dibandingkan nilai keeratan antara NDVI dengan ETp. Dalam hal ini proses evapotranspirasi merupakan salah satu faktor tak langsung pada suatu kejadian kekeringan.
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Judul: “Perhitungan Evapotranspirasi Menggunakan Citra MODIS (Studi Kasus: Das Cimadur, Banten)”
Abstrak: Evapotranspiration (ET) is the most important component of water balance after precipitation. Currently, measurement of evapotranspiration can be conducted with the input data based on Remote Sensing data. This research analyzed empiric equation of evapotranspiration, the Blaney-Criddle, using Land Surface Temperature (LST) value, extracted from Moderate Resolution Imaging Spectroradiometer (MODIS), as an temperature input in this equation. In this research validation was made between LST MODIS (day and night) and temperature of climatology station of Darmaga, at various height (5 cm, 100 cm, 120 cm) and times (07.00, 07.10, 13.00, 13.50 WIB). On LST day, temperature estimated by MODIS, closer to the temperature measurement on climatology station at a height 5 cm, with a R2 value 0,362. While the LST night have a fairly strong relationship with the T station at a height 120 cm. However, the highest R2 value obtained on the relationship between LST night with the T station at a height of 100 cm with a R2 value of 0,567. Generally, the evapotranspiration potential value in Cimadur watershed ranged from 4,45-5,65 mm/day (close to actual condition). With remote sensing based, evapotranspiration value can be presented spatially and temporally. However, there are constraints related the availability of data that caused the evapotranspiration value is only available in the dry months. This study shows that if this condition is corrected by combining the best availability of LST within a month, the availability of data in one month can be increased more than 50% from the initial condition 0%. The validation result between evapotranspiration value which is resulted by the Blaney-Criddle (ETm) and evapotranspiration value from evaporation pan A and Lysimeter, was giving the ETm value closer to the evapotranspiration value from pan A with a different value between ETm and pan A ranged from 0,82-1,32 mm (for 1x1 pixel) and 0,62-1,34 mm (for 3x3 pixel).
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Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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