تعیین مناسب‌ترین روش تهیه نقشه تیپ در جنگل‌های زاگرس مرکزی با استفاده از تصاویر ماهواره لندست 8

نوع مقاله : علمی - پژوهشی

نویسندگان

1 کارشناسی ارشد جنگلداری، دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد، شهرکرد، ایران.

2 استادیار، گروه جنگلداری، دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد، شهرکرد، ایران.

3 دانشیار، گروه جنگلداری، دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد، شهرکرد، ایران.

چکیده

نقشه تیپ جنگل یکی از ضروری‌ترین نقشه‌های موضوعی برای مدیریت اکوسیستم جنگل است. تهیه نقشه تیپ با استفاده از روش‌های میدانی یا عکس‌های هوایی، سخت و با صرف زمان و هزینه زیاد همراه است. در مقابل، داده‌های ماهواره‌ای با ویژگی‌های خاص خود مانند دید وسیع و یکپارچه، پوشش تکراری، فراهم آوردن داده‌های بهنگام و استفاده از قسمت‌های مختلف طیف الکترومغناطیسی جهت ثبت خصوصیات پدیده‌ها، امکان مناسبی را در این زمینه فراهم می‌کنند. این پژوهش با هدف تهیه نقشه تیپ بخشی از جنگل‌های زاگرس مرکزی (ذخیره‌گاه جنگلی چهارطاق) با داده‌های سنجنده OLI ماهواره لندست هشت مربوط به شهریورماه 1395 انجام شد. نقشه واقعیت زمینی از طریق پیمایش زمینی بر اساس محاسبه تراکم درختان غالب و سطح تاج‌پوشش درختان با بهره‌گیری از اطلاعات نوع گونه، موقعیت و مساحت تاج‌پوشش درختان تهیه شد. به‌منظور افزایش قدرت تفکیک مکانی داده­‌های چند طیفی، فنون مختلف ادغام روی تصاویر اعمال شد. بهترین نتیجه حاصل از خوارزمی حداکثر احتمال، مقادیر شاخص کاپا و صحت کلی برابر 57/0 و 63 درصد را در مقایسه با نقشه واقعیت زمینی بر اساس تراکم درختان در منطقه نشان داد. نتایج نشان داد تصاویر این سنجنده با توجه به تنوع زیاد گونه‌های گیاهی منطقه، قابلیت متوسطی برای تهیه نقشه تیپ جنگل­ را دارند.

کلیدواژه‌ها


عنوان مقاله [English]

Determination of the most suitable method for forest type mapping in central Zagros using landsat-8 satellite Images

نویسندگان [English]

  • Yasaman Lohrabi 1
  • Mozhgan Abasi 2
  • Ali Soltani 3
  • Hamid reza Riyahi bakhtyari 2
1 M.Sc. student of of Forestry, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, I. R. Iran.
2 Assistant Professor, Department of Forest sciences, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, I. R. Iran.
3 Associate Professor, Department of Forest sciences, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, I. R. Iran.
چکیده [English]

The forest type map is one of the most important thematic maps for forest ecosystem management. Forest mapping using field methods or aerial photos is labor-intensive and time consuming. In contrast, satellite data with its own characteristics like large and repetitive coverage, update and useful information in various wavelengths provides a good opportunity in this regard. This research was carried out with the aim of providing forest type map of central Zagros forests (Chahartagh forest reservoir), of Iran, using the Landsat 8 Operational Land Imager (OLI) data, in August 2016.Two ground-truth maps based on tree density and tree crown area were prepared by field surveying. Moreover, ancillary data such as tree species, location and crown area was taken. In order to increase the spatial resolution of multispectral bands, various image fusion techniques were applied. The best result obtained by the maximum likelihood algorithm with kappa coefficient and overall accuracy values of 57 and 63%, respectively. Due to high species diversity in this area the results showed that the OLI images have a moderate capability to produce forest type maps in Zagros forest.

کلیدواژه‌ها [English]

  • Landsat-8 images
  • Chahartagh forest reservoir
  • Classification
  • Forest type map
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