نتایج جستجو برای: شاخص vtci
تعداد نتایج: 74528 فیلتر نتایج به سال:
Vegetation temperature condition index (VTCI) is a near-real-time drought monitoring approach which is derived from normalized difference vegetation index (NDVI) changes in a given region to land surface temperature (LST) changes of pixels with a given NDVI value.It can be physically explained as the ratio of temperature differences among the pixels which have the same NDVI values.Due to the no...
در سالهای اخیر خشکسالی با تأثیرات مخرب در بخشهای مدیریت منابع آب، زیستمحیطی، اکولوژیکی به عنوان بحران جدی تلقی میشود. برنامهریزی و اقدامات پیشگیرانه در برابر خشکسالی در کاستن اثرات آن از اهمیت چشمگیری برخوردار است. در این راستا استفاده از روش مناسب پایش و پیش بینی خشکسالی میتواند تأثیر قابل توجهی در مقابله با این پدیده داشته باشد. در این تحقیق جهت پایش خشکسالی از اطلاعات حاصل از تصاویر س...
خشکسالی از جمله بلایای طبیعی است که سبب وارد شدن خسارات اقتصادی فراوانی خصوصاً در بخش جغرافیای کشاورزی و منابع طبیعی مناطق خشک می گردد. ارزیابی و پایش خشکسالی به دلیل ماهیت آرام و خزنده اش با مسائل و مشکلات فراوانی همراه است. رویکرد استفاده از شاخص های مبتنی بر فناوری سنجش ازدور به دلیل قابلیت های مکانی و زمانی مناسب و نیز عدم وجود مشکلات روش های نقطه ای، درحال توسعه و پیشرفت است. از جمله این ...
This article investigates the role of viewers’ personality traits, sensation-seeking, and voyeurism in relation to reported consumption of voyeuristic program content in various television genres. A uses and gratifications approach was employed to identify factors predicting appeal of particular TV programs. The study combines two types of media research: survey and content analysis. Results we...
WenHao Ou, Wei Su ** , Chen Wu, ZhongZheng Zhu, YanMin Li, Shi Shen (Collage of Information and Electrical Engineering, China Agricultural University, Beijing, 100083) Abstract:Landsat TM5 images are used to calculate and retrieve normalized difference vegetation index (NDVI) and land surface temperature (LST). Combining with two index mentioned, vegetation temperature condition index (VTCI) ca...
The drought caused a series of effects on many sectors of economy, especially natural resources. During two last decades, Iran has suffered from several severe to extreme agricultural droughts which caused significant decreases in rangeland and agriculture yields. This paper discusses the detection of agricultural drought severity over the rangelands of Markazi Province between 2000 and 2014 us...
the drought caused a series of effects on many sectors of economy, especially natural resources. during two last decades, iran has suffered from several severe to extreme agricultural droughts which caused significant decreases in rangeland and agriculture yields. this paper discusses the detection of agricultural drought severity over the rangelands of markazi province between 2000 and 2014 us...
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Drought is one of the natural disasters which cause economic damages especially in agriculture and natural resources sections. Because of creeper nature of drought, its assessment and monitoring is very complex and difficult. Using of drought indices is one of the most important methods in drought monitoring and evaluation. Because of suitable capabilities of remote sensing technology and its g...
The study of above-ground biomass (AGB) is important for monitoring the dynamics carbon cycle in forest ecosystems. emergence remote sensing has made it possible to analyze vegetation using land surface temperature (LST), Vegetation Temperature Condition Index (VTCI) and evapotranspiration (ET) information. However, relatively few studies have evaluated ability these variables estimate AGB temp...
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