بررسی قابلیت داده‌های تک‌قطبشی TanDEM-X در برآورد ارتفاع تاج‌پوشش جنگل‌های هیرکانی (مطالعۀ موردی: جنگل شصت‌کلاته)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموختۀ کارشناسی ارشد جنگلداری، دانشکدۀ علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان

2 استاد گروه جنگلداری، دانشکدۀ علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان

3 استادیار گروه جنگلداری، دانشکدۀ علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان

4 استادیار گروه علوم اطلاعات جغرافیایی و رصد زمین، دانشکدۀ علوم رصد زمین، دانشگاه توئنته، هلند

10.22034/ijf.2023.367017.1905

چکیده

در این پژوهش، قابلیت داده‌های راداری تک‌قطبشی ماهوارۀ TanDEM-X در برآورد ارتفاع تاج‌پوشش جنگل‌های هیرکانی بررسی شد. دو رویکرد تداخل‌سنجی تفاضلی با به‌کارگیری مدل رقومی زمین حاصل از داده‌های لیدار هوابرد و مدل Sinc حاصل ساده‌سازی مدل پراکنش حجمی نامنظم روی سطح Random Volume over Ground (RVoG) مقایسه شد. منطقۀ پژوهش در بخشی از طرح جنگلداری دکتر بهرام‌نیای گرگان (شصت‌کلاته) واقع شده است. آمار زمینی 308 قطعه نمونۀ دایره‌ای به مساحت 1/0 هکتار برای ارزیابی دقت رویکردهای استفاده‌شده در برآورد ارتفاع تاج‌پوشش به‌کار گرفته شد. به ‌این منظور میانگین ارتفاع لوری در محل قطعات نمونه محاسبه شد. دامنۀ همدوسی برای برآورد ارتفاع تاج‌پوشش با استفاده از مدل Sinc به‌کار برده شد و با حذف اثر توپوگرافی از فاز رفع ابهام‌شده که با فاز حاصل از زمین در مناطق باز تطبیق یافته بود، ارتفاع تاج‌پوشش به روش تداخل‌سنجی تفاضلی به‌دست آمد. پس از تصحیح هندسی تصاویر، میانگین ارتفاع تاج‌پوشش برآوردی در محل قطعات نمونه استخراج شد. نتایج ارزیابی مستقیم ارتفاع تاج‌پوشش برآوردی نسبت به واقعیت زمینی نشان داد که رویکرد تداخل‌سنجی تفاضلی نسبت به مدل Sinc با مقادیر مجذور میانگین مربعات خطای مطلق RMSE و نسبی rRMSE به‌ترتیب 86/2 متر و 28/12 درصد و ضریب تبیین 33/0 از دقت بیشتری برخوردار است. این درحالی است که نتایج قابل مقایسه‌ای با استفاده از مدل Sinc به‌دست آمد (m41/3 RMSE = و 64/14% rRMSE =). به‌طور کلی تحقیق حاضر پتانسیل نسبی داده‌های با طول موج کوتاه TanDEM-X و مدل‌های مبتنی بر همدوسی را به‌منظور برآورد ارتفاع تاج‌پوشش جنگل‌های هیرکانی در سطح وسیع نشان می‌دهد، اگرچه تنها 15 درصد از تغییرات میانگین ارتفاع لوری به‌وسیلۀ مدل Sinc بیان شد. از این‌رو پژوهش‌های بیشتری برای درک عوامل تأثیرگذار بر صحت نتایج از جمله نوع گونه، شیب و مشخصه‌های برداشت تصویر ضروری به نظر می‌رسد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Feasibility of single-polarized TanDEM-X data for Hyrcanian forest height estimation (Case study: Shast-Kalateh forest)

نویسندگان [English]

  • M Poorazimy 1
  • Sh Shataee Jouibary 2
  • ,J. Mohammadi 3
  • H Aghababaei 4
1 MSc., Dept. of Forestry, Gorgan University of Agricultural Science and Natural Resources, I. R. Iran
2 Prof., Dept. of Forestry, Gorgan University of Agricultural Science and Natural Resources, I. R. Iran
3 Assistant Prof., Dept. of Forestry, Gorgan University of Agricultural Science and Natural Resources, I. R. Iran
4 Assistant Prof., Dept. of Earth Observation Science, University of Twente, N. L. Netherland
چکیده [English]

In this study, the capability of single-polarized TanDEM-X data was assessed for estimating the Hyrcanian forest height. Two approaches of Sinc interferometric coherence model based on Random Volume over Ground (RVoG) and differential interferometry utilizing airborne LiDAR-derived DTM were compared. The study was conducted in part of Dr. Bahram Nia’s forest management plan (Shast-Kalateh). 308 circular sample plots with an area of 0.1 ha were used in evaluating the accuracy of predicted forest height using two different approaches. For this reason, Lorey’s mean tree height weighted by basal area was calculated. The interferometric coherency was involved in the Sinc function for inverting forest height. We also removed topography from the SAR phase calibrated with LiDAR-derived DTM on open areas for estimating forest height based on differential interferometry. After terrain correction, the average predicted canopy height was extracted for each plot. Our results showed higher accuracy of differential interferometry than the Sinc model in forest height estimation when compared with ground reference data (RMSE=2.86 m and rRMSE=12.28%). Although, the accuracy of estimated forest height by the Sinc model was comparable with RMSE=3.41 m and rRMSE=14.46%. We found TanDEM-X data and coherence-based models a relatively promising approach in the Hyrcanian forest even though only 15% of Lorey’s men height change was explained by the Sinc model. Hence, further studies are needed to figure out the effects of species, slope, and image aquisition features on the results.

کلیدواژه‌ها [English]

  • : Lorey’s height
  • Interferometry
  • RVoG model
  • Sinc model. Coherency

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مجله جنگل ایران
دوره 15، شماره 3
آذر 1402
صفحه 329-343

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  • تاریخ دریافت: 14 آبان 1401
  • تاریخ بازنگری: 05 آذر 1401
  • تاریخ پذیرش: 27 دی 1401

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