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کاربرد تصاویر ماهواره‌ای چند زمانه در بهبود دقت مدل‌های پیشیابی فنولوژی ذرت | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 2، دوره 48، شماره 1، اردیبهشت 1396، صفحه 11-24 اصل مقاله (471 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2017.61337 | ||
| نویسندگان | ||
| مهدی قمقامی1؛ نوذر قهرمان* 2؛ خلیل قربانی3؛ پرویز ایران نژاد4 | ||
| 1دانشگاه تهران | ||
| 2گروه مهندسی ابیاری-دانشگاه تهران | ||
| 3دانشگاه علوم کشاورزی و منابع طبیعی گرگان | ||
| 4موسسه ژئوفیزیک دانشگاه تهران | ||
| چکیده | ||
| متداولترین شیوه پیشیابی مراحل فنولوژیکی گیاهان، استفاده از کمیت درجه-روز رشد تجمعی (AGDD) میباشد. در تحقیق حاضر، مدلی برای تدقیق این روش با تلفیق دو نمایه AGDD و NDVI برای تخمین تاریخ شروع 8 مرحله فنولوژیکی گیاه ذرت رقم K407، با استفاده از دادههای یک دوره 9 ساله در منطقه کرج ارائه شده است. روش هموارسازی نوفهها در کاربست نمایه NDVI، ترکیبی از دو روش لجستیک دوگانه و رگرسیون وزنی (WLS-DL) می باشد. نتایج مدل تلفیقی با دو مدل مبتنی بر درجه-روز رشد و تاریخ کاشت مقایسه شد. یافتههای پژوهش نشان داد، مدل تلفیقی به طور متوسط، مقدار RMSE تاریخهای شروع 7 مرحله ابتدایی فنولوژیکی (ظهور تا شیری شدن) را به ترتیب 7/1، 4/1، 8/0، 3/1، 4/2، 4/2 و 3/3 روز نسبت به مدل مبتنی بر تاریخهای کاشت و 9/2، 7/1، 4/1، 9/2، 6/4، 9/2، 6/3 روز نسبت به مدل درجه- روز رشد، کمتر برآورد می نماید. | ||
| کلیدواژه‌ها | ||
| نمایه‌پوشش‌گیاهی؛ لجستیک‌دوگانه؛ رگرسیون‌وزنی؛ فنولوژی؛ ذرت | ||
| مراجع | ||
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