HYPERION GÖRÜNTÜSÜ İLE ATMOSFERİK DÜZELTME YÖNTEMLERİNİN KARŞILAŞTIRILMASI: ORMAN ALANI ÖRNEĞİ

Öz

Uzaktan algılama amaçlı algılayıcılar tarafından elde edilen yansıma değerleri atmosferik etkilerden dolayı hatalar içermektedir. Dolayısıyla, özellikle hiperspektral uydu görüntülerinin işlenmesinde ve analizinde doğru sonuçlar elde edilmesi için atmosferik düzeltme önemli bir işlemdir. Bu kapsamda, EO-1 Hyperion hiperspektral uydu görüntüsü kullanılarak atmosferik ışınımsal transfer modelleri (FLAASH, ATCOR)  ve Doğrusal Ampirik (EL) yöntemi kullanılarak performans sonuçları sunulmuştur. Elde edilen düzeltilmiş verilerin kalite analizi ASD spektroradyometre aleti ile yapılan yer ölçmeleri kullanılarak gerçekleştirilmiştir. Çalışmada elde edilen sonuçlara göre EL ve ATCOR yöntemlerinin atmosferik etkinin giderilmesinde en iyi sonuçları verdiği, FLAASH yönteminin ise düzeltilmiş reflektans eğrilerinde güçlü sapmalara neden olduğu görülmüştür.

Anahtar Kelimeler

• Uydu görüntüsü,Hiperspektral,Hyperion,Atmosferik düzeltme

A Comparison of Atmospheric Correction Methods on Hyperion Imagery in Forest Areas

Öz

The reflectance values recorded by Earth observing satellite sensors can be different from the surface reflectance values measured on the ground due to interference of gases and water vapor in the atmosphere. Therefore, atmospheric correction is a significant procedure to derive the true surface reflectance value during the processing of remotely sensed imagery especially with hyperspectral data. In this context, this study attempts to analyze the quality of the surface reflectance derived from EO-1 Hyperion hyperspectral imagery using the atmospheric radiative transfer (RT) models (FLAASH and ATCOR) and empirical line (EL) method. In the study, ground-based reflectance measurements derived from ASD FieldSpec spectroradiometer are used as reference to evaluate the quality of the retrieved surface reflectance. The results showed that EL and ATCOR methods achieved the best results for reducing some of the atmospheric effects, but FLAASH method resulted in strong anomalies in the corrected reflectance.

Anahtar Kelimeler

• Satellite Image,Hyperspectral,Hyperion,Atmospheric Correction

Kaynakça

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