تحقیقات کاربردی علوم جغرافیایی

تحقیقات کاربردی علوم جغرافیایی

برآورد مراحل فنولوژی کلزا با استفاده از شاخص‌های گیاهی سنجش از دور و تصاویر دیجیتال دوربین عکاسی

نویسندگان
1 دانشجوی دکتری آب‌وهواشناسی کشاورزی، گروه جغرافیایی طبیعی، دانشکده علوم جغرافیایی و برنامه‌ریزی محیطی، دانشگاه اصفهان، اصفهان، ایران .
2 دانشیار آب‌وهواشناسی کشاورزی، گروه جغرافیایی طبیعی، دانشکده علوم جغرافیایی و برنامه‌ریزی محیطی، دانشگاه اصفهان، اصفهان، ایران.
3 دانشیار سنجش‌ازدور، گروه مهندسی نقشه‌برداری، دانشکده مهندسی عمران و حمل‌ونقل، دانشگاه اصفهان، اصفهان، ایران
چکیده
در سالیان اخیر، مطالعه فنولوژی محصولات زراعی با استفاده از داده های ماهواره ای گسترش فراوانی یافته است. امروزه داده های سنجنده OLI از ماهواره لندست 8 با تفکیک مکانی 30 متر، تشخیص مراحل فنولوژی گیاهان را در مقیاس محلی فراهم کرده است. در این پژوهش، از شاخص های سنجش از دور NDVI، EVI، Greenness و Brightness حاصل از سنجنده OLI و شاخص GCC حاصل از تصاویر دوربین دیجیتال، برای برآورد مراحل فنولوژی گیاه کلزا و از فیلتر ساویتزکی- گولی برای برطرف کردن داده های پرت و تولید منحنی های هموار سری های زمانی شاخص های گیاهی استفاده شد. نتایج نشان داد که منحنی های حاصل از شاخص های NDVI, EVI, GCC هر چهار مرحله فنولوژی سنجش از دور( سبزینگی، رکود، بلوغ و پیری) را به خوبی نمایش می دهند اما شاخص Greenness، مرحله رکود را به خوبی نمایش نمی دهد. منحنی حاصل از شاخص Brightness رفتاری عکس با دیگر منحنی ها از خود نشان می دهد. بر اساس آزمون همبستگی پیرسون داده های شاخص GCC با داده های شاخص NDVI و Brightness همبستگی دارند. برای برآورد شروع فصل و پایان فصل از روش های آستانه نسبی، نرخ تغییر و مشتق اول استفاده شد و نتایج نشان داد که روش مشتق اول و آستانه نسبی به ترتیب با میانگین اختلاف 18 و 19 روز در برآورد شروع فصل و روش نرخ تغییر با میانگین اختلاف 8 روز در برآورد پایان فصل بهترین عملکرد را دارند. همچنین شاخص Brightness با میانگین اختلاف 16 روز و شاخص EVI با میانگین اختلاف 7 روز به ترتیب در برآورد شروع فصل و پایان فصل بهترین عملکرد را دارند.
کلیدواژه‌ها

عنوان مقاله English

Estimation of Phenology Stages of Rapeseed Using Remote Sensing Vegetation Indices and Digital Camera Images Index

نویسندگان English

Akbar Mirahmadi 1
Hojjatollah Yazdan Panah 2
Mehdi Momeni 3
1 Phd student, Isfahan University
2 Associate Professor, Isfahan University
3 Associate Professor, Isfahan University
چکیده English

In recent years, the technology of crop production has been greatly expanded using satellite data. Today, Landsat 8 and OLI sensor data, with a spatial resolution of 30 meters, allow the discovery of factors that control phenology on a local scale. In this study, the remote sensing indices - NDVI, EVI, Greenness, and Brightness - obtained from the OLI sensor and the GCC index obtained from digital camera images were used to estimate the phenological stages of the rapeseed plant. The Savitzky-Goli filter was used to remove outlier data and to produce smooth curves of time series of plant indices. The results showed that the curves obtained from the indices of NDVI, EVI, GCC show all four stages of remote sensing phenology – green-up, dormancy, maturity, and senescence - well, but the Greenness index did not show the dormancy stage well. The Brightness index curve shows the inverse behavior to other curves. According to Pearsonchr('39')s correlation test, GCC index data are correlated with NDVI and Brightness index data .we used the ratio threshold, rate of change and first derivative methods, to estimate "start of season" and "end of season" and the results showed that the first derivative and ratio threshold methods with an average difference of 18 and 19 days in the "start of the season" and the rate of change method, with an average difference of 8 days, has the best performance in estimating the “end of the season”. Also, the Brightness index with an average difference of 16 days and the EVI index with an average difference of 7 days have the best performance in estimating "start of season" and "end of season", respectively.

کلیدواژه‌ها English

Rapeseed
Phenology
remote sensed vegetation indices
Landsat 8
digital camera images
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