normalized difference index

results showed that hfrs foci were mainly presented in four regions, and hfrs incidence or serotypes were correlated with normalized difference vegetation index ( ndvi).

结果显示我国HFRS存在四个高发区域；HFRS发病率及病人血清型构成与植被指数（NDVI）呈现相关关系。

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the green biomass was converted to normalized difference vegetation index ( ndvi) of avhrr remote sensing, and compared with the observed ndvi from 1986 to 1990. the model was also compared with ground measurements of biomass and productivity along the transect.

模拟绿色生物量被转成AVHRR归一化植被指数（NDVI），并与1986～1990年观测到的植被指数进行了比较。

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we also studied the effects of vegetation index ( normalized difference vegetation index, ndvi) and climate factors on bird diversity. our results revealed that abundant precipitation would increase the bird diversity while temperature showed different utility to diversity index in different seasons.

通过分析归一化植被指数（NDVI）以及气候因子与鸟类多样性之间的关系，发现降水有利于增加鸟类多样性，温度对不同季节的多样性指数表现出不同的效用。

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the scientist used the normalized difference barren index to study the land.

这位科学家使用归一化差异贫瘠指数来研究土地。

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estimation of vegetation fraction from remote sensing data may be a very efficient approach. based on two important parameters of discursion of dimidiate pixel mode, the current model is improved. the model of deriving vegetation fraction from normalized difference vegetation index ( ndvi) is established.

为了有效地从遥感资料中提取植被覆盖度，在像元二分模型两个重要参数推导的基础上，对已有模型进行了改进，建立了用归一化植被指数（NDVI）估算植被覆盖度的模型。

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based on the normalized difference vegetation index ( ndvi) and the actual observation data, the pasture production estimation models for different types of grassland in qinghai province were established and validated.

以青海省为例，基于植被指数（NDVI）和地面实测资料建立了不同草地类型的牧草产量遥感估算模型，并利用地面实测资料对模型精度进行了检验。

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The correlation relationship between the normalized difference vegetation index from MODIS and the yield of grassland was regressed.

在地面同步测产的基础上，根据从MODIS资料提取的植被指数和地面草产量之间的相关关系回归出阿勒泰天然草地的遥感估产模型。

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as the continuation and development of noaa/ avhrr ndvi, the normalized difference vegetation index ( ndvi) and enhanced vegetation index ( evi) of modis have been comprehensively used in many fields.

作为NOAA/AVHRR归一化植被指数（NDVI）的延续和发展，EOS/MODIS归一化植被指数（NDVI）和增强植被指数（EVI）在许多领域得到广泛应用。

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Phenological observation data of plant communities from 1982 to 1996 at 5 sites and a method for phenological cumulative frequency modeling were used to determine the beginning dates of local phenological seasons and their corresponding threshold values of normalized difference vegetation index ( NDVI) in each year.

利用1982～1996年5个站点的植物群落物候观测数据和物候累积频率拟合法，划分各站逐年的植被物候季节，并确定各季节初日对应的当地归一化差值植被指数（NDVI）阈值。

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fast information extraction of urban built-up land based on the analysis of spectral signature and normalized difference index

基于谱间特征和归一化指数分析的城市建筑用地信息提取

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dr. chen uses the red edge normalized difference vegetation index to monitor crops.

陈博士使用红边归一化植被指数来监测农作物。

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Development and Application of the Device for Measuring Normalized Difference Vegetation Index

归一化植被指数测量仪的研制与应用

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scientists use the normalized difference infrared index to study plant health.

科学家使用归一化差分红外指数来研究植物健康。

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noaa/ avhrr reflectance and normalized difference vegetation index ( ndvi) data have been widely used in meteorological and hydrological fields.

NOAA/AVHRR反射率和标准化差值植被指数（NDVI）资料在气象、水文等领域都有广泛的应用。

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