Remote Sensing and GIS Applications in Environmental Sciences

A Synthesis Approach of Remote Sensing Data and Spectral Libraries to Estimate Land Surface Emissivity

Document Type : Original Article

Authors

1 Department of Geomatics, School of Marand Engineering, University of Tabriz,

2 Department of Geomatics, Marand Faculty of Engineering, University of Tabriz, Tabriz, Iran,

10.22034/rsgi.2022.14399

Abstract

In this research, a synthesis approach to estimating Land surface emssivity (LSE) using remote sensing data and a spectral library that can be used to any optical sensor is proposed. The suggested method not only estimates the LSE as a function of the reflection of various surface effects, but it also takes into account the spectral response functions (SRF) of the thermal and reflective bands when calculating the LSE. The suggested approach was applied to a Landsat 8 imagery, and the resulting LSE was compared to and verified using two LSE products from the ASTER. The findings indicated that the LSE from the proposed methodology in Landsat 8 thermal band 10 has a root-mean-square error of 0.76 % and 0.75 %, respectively, when compared to the equivalent LSE product of the first and second ASTER Images. This error was also calculated in the 11 thermal band, with values of 1.49 and 1.06 %, respectively. This error was also calculated in the 11 thermal band, with values of 1.49 and 1.06 %, respectively. The results of this study compute the surface emissivity as a function of the reflectance of the reflective bands, and each pixel associated with that reflectance has a unique emissivity value that differs from that of nearby pixels. The prior technique, on the other hand, assigned a constant emissivity coefficient to the value of the group of pixels, and the surface emissivity was computed as a constant discrete value in each part of the image.

Keywords

 در این تحقیق، یک رویکرد ترکیبی از دادههای سنجش از دور و کتابخانه طیفی جهت برآورد گسیلمندی سطح پیشنهاد گردیده است که بر روی هر سنجنده اپتیکی قابل اجراست. روش پیشنهادی نه تنها با دقت بهتری گسیلمندی سطح را بصورت تابعی از انعکاس عوارض مختلف سطح تخمین میزند، بلکه توابع پاسخ طیفی باندهای حرارتی و انعکاسی را در برآورد گسیلمندی سطح مدنظر قرار میدهد. همچنین، روش پیشنهادی رابطه ضعیف بین گسیلمندی و بازتاب فقط باند قرمز در روشهای قبلی را بدلیل استفاده از بازتاب همه باندهای انعکاسی تقویت مینماید. روش پیشنهادی بر روی تصویری از لندست 8 اجرا شد و گسیلمندی حاصل با دو محصول گسیلمندی سنجنده هوابرد پیشرفته با رادیمترسنج انعکاسی و حرارتی )استر( مقایسه و اعتبارسنجی شد. نتایج نشان داد که گسیلمندی حاصل از روش پیشنهادی در باند 01 حرارتی لندست 8 در مقایسه با محصول گسیلمندی متناظر تصویر بررسی اول و دوم سنجنده استر به ترتیب دارای خطای 67/1% و 67/1%  با در نظر گرفتن پارامتر ریشه میانگین مربعات خطا میباشد، همچنین این خطا در باند 00 حرارتی به ترتیب دارای مقدار 94/0% و 17/0% محاسبه گردید .خطای بیشتر در باند حرارتی 00 میتواند مربوط به اختلاف نسبتاً زیاد در تابع پاسخ طیفی و رنج طیفی و طول موج موثر بین باند 00لندست 8 و باند 09 استر باشد. نتایج این تحقیق، گسیلمندی سطح را به صورت تابعی از بازتاب باندهای انعکاسی محاسبه کرده و گسیلمندی سطح در هر پیکسیل متناسب با بازتاب انعکاسیش مقدار گسیلمندی خاص خود را دارد که متفاوت از پیکسیلهای مجاورش است در حالی که در روش قبلی برای گروهی از پیکسلها که مقادیر ثابتی از ضریب گسیل تعلق میگرفت و گسیلمندی سطح بصورت مقدار ثابت و گسسته در هر منطقهای از تصویر محاسبه میگردید .

کلمات کلیدی: گسیلمندی سطح زمین، دمای سطح زمین، لندست 8، سنجش از دور.

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Remote Sensing and GIS Applications in Environmental Sciences
Volume 1, Issue 1 - Serial Number 1
March 2022
Pages 67-91
  • Receive Date: 13 November 2021
  • Revise Date: 03 December 2021
  • Accept Date: 05 December 2021