نتایج جستجو برای: some such processes as normalized difference vegetation index

تعداد نتایج: 7023984  

Journal: :The New phytologist 2017
Cecilia Chavana-Bryant Yadvinder Malhi Jin Wu Gregory P Asner Athanasios Anastasiou Brian J Enquist Eric G Cosio Caravasi Christopher E Doughty Scott R Saleska Roberta E Martin France F Gerard

Leaf aging is a fundamental driver of changes in leaf traits, thereby regulating ecosystem processes and remotely sensed canopy dynamics. We explore leaf reflectance as a tool to monitor leaf age and develop a spectra-based partial least squares regression (PLSR) model to predict age using data from a phenological study of 1099 leaves from 12 lowland Amazonian canopy trees in southern Peru. Res...

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده ادبیات 1390

this study is an outlook of iranians religious practices and customs in eras such as nasser one. it attempts to answer the main question, "religious practices and ceremonies in the society during naseri ruling" and other subsidiary questions with scientific and historical theories. iran was a traditional and religious community . people abided by their religious practices and duties within reli...

2010
M. L. 1 Chu Lin and Tsai

The objective of this study is to develop a novel methodology integrating remote sensing, geographic information system technology and local spatial autocorrelation geo-computation for quick drought assessment. One group of drought indices, based on the condition of the vegetation, includes the Normalized Difference Vegetation Index (NDVI), Anomaly of Normalized Difference Vegetation Index (NDV...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - پژوهشکده زبانشناسی 1389

a professional is someone whose work involves performing a certain function with some degree of expertise. but a narrower definition limits the term to apply to people such as teachers and doctors, whose expertise involves not only skill and knowledge but also the exercise of highly sophisticated judgment, and whose accreditation necessitates extensive study, often university-based as well as p...

Journal: :Remote Sensing 2017
Bijian Tang Donghai Wu Xiang Zhao Tao Zhou Wenqian Zhao Hong Wei

Wind farms (WFs) can affect the local climate, and local climate change may influence underlying vegetation. Some studies have shown that WFs affect certain aspects of the regional climate, such as temperature and rainfall. However, there is still no evidence to demonstrate whether WFs can affect local vegetation growth, a significant part of the overall assessment of WF effects. In this resear...

Journal: :Remote Sensing 2015
Sergio Vicente-Serrano Daniel Cabello Miquel Tomás-Burguera Natalia Martín-Hernández Santiago Beguería Cesar Azorin-Molina Ahmed El Kenawy

We analyzed potential land degradation processes in semiarid regions worldwide using long time series of remote sensing images and the Normalized Difference Vegetation Index (NDVI) for the period 1981 to 2011. The objectives of the study were to identify semiarid regions showing a marked decrease in potential vegetation activity, indicative of the occurrence of land degradation processes, and t...

2006
Alfredo Huete Edward Glenn Allan Matthias Stuart Marsh Kurtis Thome Abdullah F. Rahman Ho Jin Kim Youngwook Kim Lisa Goins Judith Ellwanger Veronica Hirsch Alicia Velasquez

Vegetation indices (VI ) play an important role in studies of global climate and biogeochemical cycles, and are also positively related to many biophysical parameters and satellite products, such as leaf area index (LAI), gross primary production (GPP), land surface water index (LSWI) and land surface temperature (LST). In this study we found that VI’s had strong relationships with some biophys...

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