بررسی صحت برآورد ارتفاع تاج‌پوشش جنگل توسط ماهوارة ICESat-2 در جنگل خیرود

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه جنگلداری و اقتصاد جنگل، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران.

2 مرکز سنجش از دور موسسة ملی تحقیقات کشاورزی، غذا و محیط‌ زیست، مونتپلیه، فرانسه.

10.22059/jfwp.2024.368338.1269

چکیده

آگاهی از ارتفاع تاج‌پوشش جنگل به ­منظور ارزیابی سلامت و پویایی بوم­سازگان جنگل، پایش و مدل­سازی چرخه کربن و تنوع زیستی، امری ضروری است. اندازه ­گیری ارتفاع تاج‌پوشش جنگل مستلزم صرف هزینه و زمان زیاد است. از سال 2018 میلادی، ماهوارة ICESat-2 که سنجندة لیزری ATLAS را حمل می‌کند، امکان اندازه ­گیری مستقیم ارتفاع درختان را فراهم کرده است. هرچند که ICESat-2 به‌طور خاص برای برآورد ارتفاع یخ ­های قطبی طراحی شده ­است، اما داده ­های ارتفاعی قابل توجهی از پوشش گیاهی سطح کرة زمین را نیز ارائه می‌دهد. از این‌رو، هدف از این پژوهش بررسی قابلیت سنجندة ATLAS این ماهواره در برآورد دقیق ارتفاع تاج‌پوشش جنگل ­های شمال ایران است. برای این منظور، داده­ های ارتفاعی پوشش گیاهی سنجندة ATLAS (ATL08) در جنگل آموزشی-پژوهشی خیرود مورد ارزیابی قرار گرفت. برای بررسی میزان صحت ارتفاع برآورد شده تاج‌پوشش درختان توسط سنجندة ATLAS، داده­های ارتفاعی حاصل از ماهواره با حداکثر ارتفاع اندازه­ گیری شده در 121 لکة زمینی مقایسه و آماره­ های RMSE و rRMSE محاسبه شدند. همچنین با استفاده از آزمون t، میانگین این داده ­ها از نظر آماری مقایسه شدند. مقادیر RMSE، rRMSE و R2 به ­ترتیب 0/87 متر و 2/7 درصد و 0/98 نشان­ دهندة دقت بالای سنجنده در اندازه­ گیری ارتفاع تاج‌پوشش جنگل بود. نتایج آزمون t نیز نشان داد که میانگین این داده ­ها از نظر آماری اختلاف معنی­ داری ندارد (0/05<P). نتایج این پژوهش نشان داد که حتی باوجود بیش برآورد ارتفاع تاج‌پوشش جنگل در مناطقی با درختان کم ارتفاع، این ماهواره ارتفاع تاج‌پوشش جنگل در مناطق جنگلی شمال ایران را با صحت بسیار خوبی برآورد می ­کند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Accuracy investigation of forest canopy height estimation by ICESat-2 satellite in Kheyroud forest

نویسندگان [English]

  • Mahan Ghorbani 1
  • Ali Asghar Darvish Sefat 1
  • Manochehr Namiranian 1
  • Manizheh Rajabpour Rahmati 2
1 Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran.
2 CIRAD, CNRS, INRAE, TETIS, University of Montpellier, AgroParisTech, CEDEX 5, 34093 Montpellier, France.
چکیده [English]

Knowing the forest canopy height is essential for evaluating the health and dynamics of forest ecosystems, as well as for monitoring and modeling the carbon cycle and biodiversity. However, measuring canopy height through ground surveys is costly and time-consuming. Since 2018, the ICESat-2 satellite, equipped with the ATLAS laser sensor, has enabled the direct measurement of tree height. Although ICESat-2 is specifically designed to estimate ice height, it also provides significant data on vegetation height on the Earth's surface. This study aims to investigate the ability of the ATLAS sensor to accurately estimate forest canopy height in northern Iran. For this purpose, the vegetation height data from the ATLAS sensor (ATL08) was evaluated in the Kheyroud experimental forest. To validate the accuracy of the estimated forest canopy height by ATLAS, the forest height data obtained from the satellite were compared with the maximum tree height measured in 121 plots collocated with LiDAR footprints. The estimated forest canopy height by ATLAS and the maximum measured height of trees were compared using a t-test. The RMSE, rRMSE, and R2 values were 0.87 m, 2.7%, and 0.98, respectively, indicating the high accuracy of the ATLAS sensor in forest canopy height estimation. The results of the t-test showed that the mean difference between the measured maximum height of trees in the plots and the corresponding values extracted from ICESat-2 satellite data is not statistically significant (P > 0.05). This study demonstrates that the satellite estimates forest canopy height with very good accuracy in the forests of northern Iran, with a slight overestimation in areas with low-height trees.

کلیدواژه‌ها [English]

  • ATLAS sensor
  • Forest canopy height
  • ICESat-2
  • Space-borne LiDAR

مراجع

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نشریه جنگل و فرآورده های چوب
دوره 77، شماره 1
خرداد 1403
صفحه 85-96

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