Jeoid Değişimlerinin ICESat Altimetre Verisi ile Hesaplanan Su Seviyelerine Etkisi

Abstract

Çalışmada, ICESat uydusundaki GLAS altimetre verileriyle hesaplanan su seviye yüksekliklerine jeoid yüksekliklerinin etkileri Burdur Gölü (BG) üzerinde incelenmiştir. Su yüzeylerinin günlük olarak tespit edilebilmesi için MODIS uydusuna ait karla kaplı alan haritaları kullanılmıştır. ICESat verilerindeki Global EGM2008 jeoid ile hesaplanan ve BG yer gözlem ölçülerinin su seviye farkları -0.96m ile -0.60m aralığında olup hataların ortalama karekökü 0.73m dir. Güncellenen jeoid ile hesaplanan su seviyelerinin hataları -0.20m ile 0.16m aralığında olup hataların ortalama karekökü 0.12m’ye inmiştir. DSİ yer gözlem verileri ile yapılan karşılaştırmada R2 0.98 olarak bulunmuştur. Birbirini takip eden kış ve yaz su seviye farkları 0.74m hesaplanıp maksimum 1.0m lik değişim içinde kalmıştır.

Keywords

• Burdur Gölü
• jeoid
• EGM2008
• ICESat
• GLA14
• MODIS

Effect of Geoid Variations on ICESat Altimeter Based Water Surface Elevations

Abstract

This study investigates the effects of geoid variations on GLAS altimeter onboard ICESat satellite based water surface elevations (WSE) over Burdur Lake (BL). MODIS snow-covered area maps are used to detect water surfaces daily. The differences between ground observations of BL WSE and those calculated using ICESat Global EGM2008 geoid varied between -0.96m and -0.60m with a root mean square error of 0.73m. The errors of re-calculated water levels with the updated geoid heights varied from -0.20m to 0.16m and the root mean square error decreased to 0.12m. Comparison with DSİ ground observations yielded R2 as 0.98. Water level differences between the successive winter and summer is 0.74m and remained within the maximum change of 1.0m.

Keywords

• Lake Burdur
• Geoid
• EGM2008
• ICESat

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