Abstract
A research using remote sensing have been done on Kawah Wurung-Ijen. This research was conducted to analyze the distribution of land surface temperature and to identify the geothermal manifestations. The land surface temperature was obtained by using emissivity method of calculating the Normalized Difference Vegetation Index (NDVI). Remote sensing data was used more secund data from Landsat 8. The result shows that the research area has the land surface temperature distribution in ranges 10°C to 50°C. The interpretation shows any anomalous area in ranges 31°C to 50°C that indicated as geothermal potential area. The anomalous are associated with volcanic areas. In the West is associated with Mt. Genteng, in the North is associated with Mt. Gending Waluh. In addition, there is also an anomaly in the East precisely around kolovium of Mt. Kukusan.
Highlights
A research using remote sensing have been done on Kawah Wurung-Ijen
This research was conducted to analyze the distribution of land surface temperature
The land surface temperature was obtained by using emissivity method of calculating the Normalized Difference Vegetation Index
Summary
Data penginderaan jauh yang digunakan pada penelitian ini merupakan data sekunder dari Landsat 8. Data untuk menentukan sebaran suhu permukaan tanah pada penelitian adalah kanal multispektral (kanal 4 dan kanal 5) dan infra merah (kanal 10 dan 11). Pengumpulan data dilakukan dengan mengunduh data citra Landsat 8 yang direkam pada waktu yang berbeda-beda dan pada musim yang hampir sama yaitu 24 Mei 2015, 28 Agustus 2015, 26 Mei 2016, 11 Juni 2016 dan 29 Juli 2016 dari situs USGS dengan daerah penelitian adalah Kawah Wurung, Kabupaten Bondowoso, Provinsi Jawa Timur seperti pada Gambar 1. Langkah awal yang dilakukan terhadap data citra landsat 8 adalah melakukan deteksi awan dan kabut. Semakin banyak luas liputan awannya maka semakin banyak pula informasi permukaan Bumi yang hilang karena tutupan awan dan sekaligus bayangannya. Peta lokasi daerah penelitian di Kawah Wurung-Ijen, Kabupaten Bondowoso, Jawa Timur (kotak merah) menunjukkan elevasi berdasarkan data SRTM DEM dengan interval kontur 20 m. Selanjutnya untuk melihat persentasi proyeksi vertikal dari tutupan lahan bervegetasi di suatu daerah dapat dilakukan dengan menghitung fraksi vegetasi menggunakan persamaan berikut [13]:
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