نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد سنجش از دور، دانشگاه آزاد، واحد تهران جنوب

2 استادیار گروه مهندسی نقشه‌برداری، دانشگاه آزاد، واحد تهران جنوب

چکیده

مادة آلی محلول رنگی (CDOM) مقیاس مهمی در سنجش کیفیت آب است. می‌توان اذعان کرد CDOM نور موجود در لایه‌های آب را کاهش می‌دهد و فعالیت‌های بیولوژیکی فتوسنتز را مختل می‌کند و سرانجام، مانع رشد جمعیت فیتوپلانکتون‌‌هایی می‌شود که برای زنجیرة غذای آبزیان ضروری‌اند. در بیشتر تحقیق‌هایی که تا کنون به انجام رسیده، از طول موج خاصی برای اندازه‌گیری ضریب جذب CDOM استفاده شده است اما، در این تحقیق، امکان استفاده از گسترة‌ وسیعی از باندهای طیف مرئی، برای تعیین مادة آلی محلول رنگی، در طول موج‌‌های 443-254 (254، 260، 350، 375، 400، 412، 440، 443) نانومتر در ماهوارة لندست 8 بررسی شده؛ ضمن آنکه مناسب‌ترین نسبت باند برای اندازه‌گیری مادة آلی محلول، در طول موج‌های قابل‌ اندازه‌گیری، با استفاده از الگوریتم SVR (اجزای این پارامتر بهینه‌سازی شده است) به‌دست آمده است. در پژوهش حاضر، نسبت باندهای Coastal به قرمز (R1/R4)، آبی به قرمز
(R2/R4) و نسبت باندهای سبز به قرمز (R3/R4) برای بازیابی CDOM در نظر گرفته شده است. براساس نتایج و با توجه به ضریب تعیین (71/0=R2) و میزان خطاها ( m161/1MSE=،m-1 077/1RMSE= وm-1 946/0MAE=) می‌توان نتیجه گرفت که استفاده از نسبت باندهای سبز به قرمز در ماهوارة لندست 8 مناسب‌ترین گزینه برای تعیین مادة آلی محلول رنگی است. افزون‌براین، نتایج این تحقیق مشخص کرده‌اند که اندازه‌گیری  CDOMدر طول موج 440 نانومتر می‌تواند شاخص مناسبی برای بررسی کیفیت دریاچه‌ها، براساس غلظت آنها، محسوب شود.

کلیدواژه‌ها

عنوان مقاله [English]

Optimal Band Selection of Landsat-8 Images for Estimation of CDOM of Lakes Using Support Vector Regression

نویسندگان [English]

  • Mohammad Momeni Esfahani 1
  • Amir Shahrokh Amini 2

1 M.Dc. of RS and GIS, Islamic Azad University, South Tehran Branch

2 Associate Prof., Dep. of Surveying Engineering, Islamic Azad University, South Tehran Branch

چکیده [English]

Colored dissolved organic matter (CDOM) is an important measure of water quality. CDOM can reduce the amount of light in water layers, disrupt the biological activity of photosynthesis, and inhibit the growth of phytoplankton populations that are essential for the aquatic food chain. Contrary to conducted research to date, which uses a specific wavelength, in this paper, we first examined the possibility of using visible portion of the spectrum to determine CDOM at 254-443 nm (254, 260, 350, 375, 400, 412, 440, 443 nm) in Landsat 8 . we then selected the most appropriate band ratios to measure CDOM at measurable wavelengths using the SVR algorithm (the parameters of which have been optimized using the genetic algorithm). It is noteworthy that in this study, the ratio of Coastal to red bands (), blue to red (), and the ratio of green to red bands () were considered for CDOM retrieval. Based on the results, considering the coefficient of determination ( = 0.71) and the amount of errors (MSE = 1.161 , RMSE = 1.077  and MAE = 0.946 ), it was concluded that the ratio of green to red bands in Landsat 8 is the most suitable choice for determining the colored dissolved organic matter. Moreover, according to the results from this study, the measurement of CDOM (440) is the most appropriate index for evaluating the quality of lake water resources in terms of their concentrations.

کلیدواژه‌ها [English]

  • Colored dissolved organic matter
  • SVR
  • Landsat 8
  • Water quality measurement
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