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تعداد نتایج: 22418 فیلتر نتایج به سال:
Quantifying vegetation fractional cover (VFC) and assessing its role in heat fluxes modeling using medium resolution remotely sensed data has received less attention than it deserves in heterogeneous urban regions. This study examined two approaches (Normalized Difference Vegetation Index (NDVI)-derived and Multiple Endmember Spectral Mixture Analysis (MESMA)-derived methods) that are commonly ...
The accuracy degree of extracted canopy latent heat from canopy net radiation is depending extremely to the proposed PriestleyTaylor approximation. This extracting canopy latent heat is an initial approximation to compute iteratively partitioned energy components to soil and vegetation using in Two Source Energy Balance (TSEB) Model. This approximation is using a PriestleyTaylor coefficient (αp...
Having an accurate yet simple method to estimate crop evapotranspiration (ETC) is a vital component of reliable irrigation scheduling. In this study, two versions the two-source energy balance (TSEB) model: TSEB model with Priestley–Taylor equation (TSEB-PT) and Penman–Monteith (TSEB-PM), were used ETC dry edible beans in western Nebraska. Compared previous studies, study unique that Visual Bas...
Cutaneous lymphomas are particularly radiosensitive and amenable to palliative radiation therapy. Total skin electron beam therapy (TSEB) is effective for palliation of Sézary syndrome and cutaneous T-cell lymphoma with large body surface area involvement. Focal radiation therapy is often used for treatment of localized disease. Treatment of cutaneous T-cell lymphoma can often pose technical ch...
Evapotranspiration (ET) is a crucial part of commercial grapevine production in California, and the partitioning this quantity allows separate assessment soil vine water energy fluxes. This has an important role agriculture since it related to stress, yield quality, irrigation efficiency, growth. Satellite remote sensing-based methods provide opportunity for ET at subfield scale. However, mediu...
Evapotranspiration (ET) estimates are particularly needed for monitoring the available water of arid lands. Remote sensing data offer the ideal spatial and temporal coverage needed by irrigation water management institutions to deal with increasing pressure on available water. Low spatial resolution (LR) products present strong advantages. They cover larger zones and are acquired more frequentl...
تخمین دقیق تبخیرـ تعرق در برنامهریزیهای توسعۀ آبیاری اهمیت ویژهای دارد. تخمین این پارامتر به صورت پیوسته در مکان و با فواصل زمانی کوتاه، فرصت بسیار باارزشی را برای مدیریت بخشهای مختلف شبکههای آبیاری فراهم میآورد. بنابراین، در تحقیق حاضر از دادههای لایسیمتر زهکشدار برای صحتسنجی نتایج بهدستآمده از تخمین تبخیر-تعرق با استفاده از سه الگوریتم تکمنبعی SEBAL، METRIC و SSEB و یک الگوریتم د...
Savannas are among the most variable, complex and extensive biomes on Earth, supporting livestock and rural livelihoods. These water-limited ecosystems are highly sensitive to changes in both climatic conditions, and land-use/management practices. The integration of Earth Observation (EO) data into process-based land models enables monitoring ecosystems status, improving its management and cons...
Accurate estimation of surface energy fluxes from space at high spatial resolution has the potential to improve prediction of the impact of land-use changes on the local environment and to provide a means to assess local crop conditions. To achieve this goal, a combination of physically based surface flux models and high-quality remote-sensing data are needed. Data from the ASTER sensor are par...
This study aims to improve the standard water balance evapotranspiration (WB ET) estimate, which is typically used as benchmark data for catchment-scale ET estimation, by accounting net intercatchment groundwater flow in calculation. Using modified WB approach, we examine errors and shortcomings associated with long-term annual mean (2002–2014) spatial patterns of three remote-sensing (RS) MODI...
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