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مقایسه سه شاخص طیفی گیاهی در طبقهبندی پوشش/ کاربری اراضی با استفاده از درخت تصمیم | ||
| دانش کشاورزی وتولید پایدار | ||
| دوره 35، شماره 4، 1404، صفحه 253-269 اصل مقاله (1.28 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/saps.2024.61012.3200 | ||
| نویسنده | ||
| فاطمه رحیمی اجدادی* | ||
| گروه مهندسی بیوسیستم، دانشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران | ||
| چکیده | ||
| مقدمه و اهداف: تغییرات شدید کاربری اراضی در دو دهه گذشته در استانهای شمالی کشور از معضلات اصلی نهادهای سیاستگزار بوده و همواره دستیابی به روشهای مناسب حائز اهمیت میباشد. هدف از پژوهش حاضر ارزیابی عملکرد و مقایسه سه شاخص طیفی گیاهی در طبقهبندی پوشش/کاربری زمین در شهرستان لاهیجان و بهبود نتایج بدستآمده میباشد. مواد و روشها: از تصاویر سنجندهی OLI ماهواره لندست 8 برای تولید نقشههای مربوط به سه شاخص طیفی NDVI، LAI و EVI استفاده شد. طبقهبندی با استفاده از درخت تصمیم و اعمال حد آستانه و با توجه به شش کاربری منطقه انجام شد و نقشههای کاربری- پوشش اراضی تولید گردید. برای بهبود عملکرد طبقهبندی، درخت تصمیم جدیدی با تلفیق دادههای NDVI و مدل رقومی ارتفاع پیشنهاد شد. یافتهها: نتایج اعتبارسنجی با استفاده از ماتریس اغتشاش نشان داد عملکرد NDVI با صحت کلی 7/87٪ و ضریب کاپای 83/0دقیقتر از دو شاخص دیگر بوده است. صحت کلی LAI و EVI برابر 4/71 و 6/71% بود. ضرایب کاپای بدستآمده به ترتیب 828/0، 609/0 و 614/0 بود. روش پیشنهادی صحت کل را به میزان 94/4% افزایش و به 60/92% رساند. همچنین درصد طبقهبندی صحیح در کلاس باغ چای را از 75/50 به 86/87٪ و در کلاس جنگل از 08/95 به 18/98٪ افزایش داد. نتیجهگیری: در مناطق با پوشش گیاهی متراکم، میتوان با تلفیق دادههای NDVI و مدل رقومی ارتفاع در قالب یک درخت تصمیم، نتایج طبقهبندی پوشش/کاربری اراضی را بهبود بخشید. نتایج پژوهش حاضر را میتوان برای پهنهبندی و شناسایی سریع پوششها و کاربریهای منطقه استفاده کرد. | ||
| کلیدواژهها | ||
| تصویر ماهوارهای؛ سنجش از دور؛ شالیزار؛ کاربری اراضی؛ لندست؛ مدل رقومی ارتفاع | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 17 تعداد دریافت فایل اصل مقاله: 15 |
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