Sains Malaysiana 41(7)(2012): 841–846

Application of a Simple Mono Window Land Surface Temperature Algorithm

from Landsat ETM+ Over Al Qassim, Saudi Arabia

(Aplikasi Algoritma Tetingkap Mono Suhu Permukaan Tanah Daripada Landsat

ETM+ bagi Al QAssim, Saudi Arabia)

H.S. Lim*, M. Z. Mat Jafri & K. Abdullah

School of Physics, Universiti Sains Malaysia, Minden 11800 Penang, Malaysia

Sultan Alsultan

Remote Sensing Center of Environment Consultant, ISPRS, commission 7 WGVII/7

Middle East Coordinator, Malaz, Al Nurii St., P.O. Box. 92038, Riaydh City 11653, Saudi Arabia

Diserahkan: 12 April 2011 / Diterima: 21 Februari 2012

ABSTRACT

This study was conducted to retrieve the land surface temperature (LST) from Landsat ETM+ data for Al Qassim, Saudi Arabia. The proposed technique employed a mono window LST algorithm for retrieving surface temperature from Landsat ETM+. The land surface emissivity and solar angle values were needed in order to apply these in the proposed algorithm. The surface emissivity values were computed based on the NDVI values. The LST values derived from ATCOR2_T in the PCI Geomatica image processing software was used for algorithm calibration. The results showed a high correlation coefficient (R) and low root-mean-square error (RMS) between the LST values retrieved from the proposed algorithm and ATCOR2_T. This study indicated that the proposed algorithm is capable of retrieving accurate LST values and the derived information can be used in the environmental impact assessment for Al Qassim area.

Keywords: Algorithm; ATCOR2_T; LST

ABSTRAK

Kajian ini dilakukan dengan mendapatkan suhu permukaan tanah (LST) daripada data Landsat ETM+ untuk Al Qassim, Arab Saudi. Teknik yang dicadangkan ini menggunakan algoritma tetingkap mono LST untuk mendapatkan suhu permukaan daripada Landsat ETM+. Nilai pancaran permukaan tanah dan nilai-nilai sudut suria diperlukan untuk melaksanakan dalam algoritma yang dicadangkan. Nilai pancaran permukaan tersebut dikira berdasarkan nilai NDVI. Nilai LST berasal daripada ATCOR2_T dalam perisian computer Geomatica PCI digunakan untuk kalibrasi algoritma. Hasilnya menunjukkan pekali korelasi yang tinggi (R) dan nilai sisihan punca min kuasa dua yang rendah (RMS) antara LST nilai dianggarkan daripada algoritma yang dicadangkan dan ATCOR2_T. Kajian ini menunjukkan bahawa algoritma yang dicadangkan mampu mendapatkan nilai LST dengan kejituan yang tingggi dan maklumat yang diperoleh boleh digunakan dalam penilaian kesan persekitaran untuk kawasan Al Qassim.

Kata kunci: Algorima; ATCOR2_T; LST

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*Pengarang untuk surat-menyurat; email: hslim@usm.my