今天我们给大家讲一个精准农业中非常重要的数据NDVI,NDVI从字面的意思上叫归一化差异植被指数。说实在,我在看到这个名字的时候也是不知所云,根本不知道它在说什么。随着对它的定义的了解,对它的应用的了解之后,我才慢慢有所理解。 NDVI的定义,NDVI=(NIR-RED)/(NIR+RED),就算是看完这个公式,我相信大多数人仍然...
因此,就有人利用这种关系,找出了一个办法来定义植被的健康,就是NDVI。 这个公式非常巧妙,我们可以看到当红光被大量吸收,NIR被大量的反射的时候,NIR-RED/NIR+RED会越来越接近1,因为RED变得小了,对分子和分母的影响就小了,上下的比例就会越来越接近1。 相反当植被不健康的时候,红光被反射就多了,NIR被反射的就少...
2010年亚马逊流域乾旱常态化差值植生指标(normalized difference vegetation index)。图片来自:波士顿大学。 two217.pixnet.net|基于4个网页 3. 植被归一化指数 ... (water index, 含水量指数) (Normalized difference vegetation index,植被归一化指数) 3 (vegetation index, 植被指数) ... ...
1) normalized difference vegetation index (NDVI) 归一化差值植被指数(NDVI)1. The authors of the paper extracted the normalized difference vegetation index (NDVI) and the vegetation conditional ratio (VCR) from the MODIS images,and analyzed the relationship among NDVI,VCR and the measured data of ...
The normalized difference vegetation index (NDVI) is often used as a marker of surrounding greenness in epidemiological studies aiming to evaluate the health effects of green space in urban settings. However, it is not clear the relationship between built environment characteristics, including green ...
What is NDVI (Normalized Difference Vegetation Index)? NDVI always ranges from -1 to +1. But there isn’t a distinct boundary foreach type of land cover. For example, when you have negative values, it’shighly likely that it’s water. On the other hand, if you have an NDVI value cl...
1)normalized difference vegetation indexNDVI 1.On the basis of Normalized Difference Vegetation Index (NDVI) data with resolution of 1 km of NOAA/AVHRR in 1993 and NDVI data for MODIS in 2000 and 2006,the authors analyzed the NDVI spatial dynamic variations by changing intensive parameters in th...
归一化差值植被指数(NDVI),normalized difference vegetation index (NDVI) NDVI归一化植被指数(NDVI) 1.Based on the method of NDVI,the NDVI of Stone Forest and other areas of Shilin county were calculated and analyzed by choosing the data of Landsat in 1977,TM in 1992,ETM and satellite image in...
27.4.1.1 Normalized Difference Vegetation Index The normalized difference vegetation index (NDVI), which is derived from remote-sensing (satellite) data, is closely linked to drought conditions. To determine the density of green on a patch of land, the distinct colors (wavelengths) of visible and...
2) Normalized Difference Vegetation Index(NDVI) 标准化植被指数(NDVI) 3) standard 标准 1. Study on the relation of thestandards,quality and praduction of the chemical products; 试论化工产品的标准、质量和生产的关系 2. Discussion of Perfecting Standard System of Domestic Ecological Textiles; ...