PEMANFAATAN BAND TERMAL CITRA LANDSAT UNTUK IDENTIFIKASI KELUARAN AIRTANAH LEPAS PANTAI (KALP) DI PANTAI UTARA LOMBOK
Abstract
This paper examines the use of Landsat 7 and 8 thermal band as an indirect method of identifying submarine groundwater discharge (SGD) in the northern coast of Lombok Island. Image processing steps include atmospheric correction, the acquisition value of the effective temperature, effective temperature anomalies and effective standardised temperature anomalies, as well as image enhancement. Effective standardised temperature anomaly map has more varied pattern than the effective temperature map. But both of them have not been able to demonstrate the extreme temperatures that indicate the location of SGD. Parameter of effective standardised temperature anomaly could not be used as a single variable. SGD identification in tropical area needs more detailed spatial resolution. The acquisition time has also to be considered i.e. when low tidal and for low temperature SGD, when the water temperature is warmer.
Abstrak
Makalah ini mengkaji penggunaan band termal citra Landsat 7 dan 8 sebagai metode tidak langsung dalam mengidentifikasi kehadiran keluaran airtanah lepas pantai (KALP) di perairanutara Pulau Lombok. Langkah pengolahan citra meliputi koreksi atmosferik, pemerolehan nilai suhu efektif, anomali suhu efektif, dan anomali suhu efektif standar serta penajaman citra. Peta
anomali suhu efektif standar memiliki pola yang lebih bervariatif dibandingkan peta suhu efektif. Namun keduanya belum dapat menunjukkan suhu ekstrim yang mengindikasikan lokasi KALP. Parameter anomali suhu efektif standar tidak dapat dipergunakan sebagai variabel tunggal. Identifikasi lokasi KALP di daerah tropis membutuhkan data citra dengan resolusi spasial yang lebih detail. Pemanfaatan data citra juga perlu memperhatikan waktu perekaman citra yaitu pada saat kondisi perairan hangat untuk kasus KALP bersuhu rendah dan pada saat air surut.
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DOI: http://dx.doi.org/10.14203/risetgeotam2017.v27.422
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