نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار پژوهش، مؤسسة تحقیقات جنگل‌ها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران
2 مربی پژوهش، موسسة تحقیقات جنگل‌ها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران
3 کارشناس پژوهش، مؤسسة تحقیقات جنگل‌ها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران
4 دکتری محیط‌زیست، دانشکدة منابع طبیعی، دانشگاه تهران
چکیده
فقدان اطلاعات بهنگام، مستند و علمی از وضعیت موجود (سطح و پراکنش) صنوبرکاری‌های استان زنجان یکی مشکلات اصلی مدیران بخش زراعت چوب به‌منظور برنامه‌ریزی و مدیریت تأمین چوب در استان است. در این پژوهش، از داده‌های چندزمانة ماهوارة سنتینل‌ـ 2 برای تهیة نقشة عرصه‌های صنوبرکاری استان استفاده شد. این داده‌ها براساس فنولوژی و دورة رویش صنوبر (نیمة دوم مارس تا پایان نوامبر) سال 2018 م.، در شش مقطع زمانی به‌فاصلة سی تا چهل روز، انتخاب شد. تعداد 144 پلی‌گون نمونة تعلیمی (102 هکتار)، حاصل از برداشت میدانی محدودة صنوبرکاری، با داده‌های ذکرشده و طبقه‌بندی نظارت‌شده در الگوریتم ماشین بردار تصمیم‌گیری و نقشة پراکنش عرصه‌های صنوبرکاری استان استخراج شد. نقشة حاصل با ششصد نمونه (حدود 5/1%) به‌صورت تصادفی انتخاب و در عرصة میدانی، کنترل و ارزیابی صحت شد. نتایج نشان داد مساحت کل عرصه‌های صنوبرکاری استان 2744 هکتار است که 12/0% از کل مساحت استان زنجان را دربر می‌گیرد. در این تحقیق، موقعیت دقیق مکانی و مساحت صنوبرکاری‌ها با صحت کلی 96% برآورد شد. نتایج این تحقیق نشان داد که با ترکیب تصاویر ماهواره‌ای سنتینل‌ـ 2 و داده‌های زمینی مناسب، می‌توان سطح صنوبرکاری‌ها و یا سطح و درصد تراکم هر نوع از جنگل را، چه طبیعی و چه دست‌کاشت، در سطح محلی و منطقه‌ای و جهانی، با دقت مورد قبولی برآورد کرد.
کلیدواژه‌ها
عنوان مقاله [English]
Preparation and Verification of Poplar Plantation Mapping Using Satellite Data of Sentinel-2 and Ground Data in Zanjan Province
نویسندگان [English]
- Mahmoud Bayat 1
- Khosro Mirakhorloo 2
- Hosein Sadeghzadeh 3
- Sahar Heidari Masteali 4
1 Assistant Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran
2 Research Instructor, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran
3 Research Expert, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran
4 Ph.D. of Environment, Faculty of Natural Resources, University of Tehran
چکیده [English]
Lack of up-to-date, documented and scientific information on the current situation (area and distribution) of Zanjan poplar plantation is one of the main problems of wood production managers for planning and management of wood supply in the province and the country. In this study, Sentinel-2 satellite data with spatial resolution of 10 m in spectral bands were used and the ground truth map of existing poplar fields with 600 points was plotted in all cities and villages from field surveys. From the beginning to the end of the poplar growing season (first half of March to December 2018), at least 6 time periods of 30 to 40 days were used in the SVM classifier. Post-test and calibration of SVM model based on the phenology of poplar genus and field samples were extracted, populated area distribution map of province was extracted. The results showed that the total area of poplar areas is 2744 hectares which covers 0.12% of total area of Zanjan province. One percent of the total polygons were randomly selected for field control and after field control, the overall mapping error was obtained and calculated. In this study, the exact location and area of poplar mills were estimated with acceptable accuracy (96%). So that using extracted information (distribution map of poplars of the province) can provide studies on comprehensive planning of poplars and sustainable management of wood production from the poplars of the province.
کلیدواژه‌ها [English]
- Distribution map
- Overall accuracy
- Poplar population
- Satellite data
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