Perubahan suhu permukaan tanah / Land Surface Temperature (LST) terhadap kekeringan di wilayah Kecamatan Ampek Angkek, Kabupaten Agam, Sumatera Barat

Andre; Eva Purnamasari; Triyatno; Dilla Angraina

doi:10.21009/JSG.v4i2.02

Authors

Andre Departemen Penginderaan Jauh dan Sistem Informasi Geografis, Sekolah Vokasi, Universitas Negeri Padang
Eva Purnamasari Departemen Penginderaan Jauh dan Sistem Informasi Geografis, Universitas Negeri Padang
Triyatno Departemen Penginderaan Jauh dan Sistem Informasi Geografis, Universitas Negeri Padang
Dilla Angraina Departemen Penginderaan Jauh dan Sistem Informasi Geografis, Universitas Negeri Padang

DOI:

https://doi.org/10.21009/JSG.v4i2.02

Keywords:

Land Surface Temperature, Normalized Difference Drought Index (NDDI) , Landsat 8 OLI, Kabupaten Agam

Abstract

This study analyzed changes in land surface temperature and its relationship with drought in Ampek Angkek District, Agam Regency, West Sumatra. A descriptive quantitative approach used Landsat 8 OLI/TIRS imagery from 2019, 2022, and 2025. Land surface temperature was derived through radiometric and atmospheric correction, brightness temperature, vegetation proportion, and surface emissivity processing. Drought in 2025 was mapped with the Normalized Difference Drought Index, combining vegetation and land-moisture information. Field validation was conducted at 40 sample points, and the relationship between land surface temperature and drought was tested using Spearman’s rho. Maximum land surface temperature increased from 27 °C in 2019 to 30 °C in 2022 and 32 °C in 2025. The 2025 drought map classified the entire study area as severe drought, with index values of 0.6628–0.8549. Spearman’s rho was 0.669 with a significance value of <0,05, showing a significant positive association. Field observations supported the pattern of lower vegetation and soil moisture accompanied by higher surface temperature.