Landsat Normalized Difference Vegetation Index (NDVI) is used to quantify vegetation greenness and is useful in understanding vegetation density and assessing changes in plant health.

Two vegetation indices are derived from atmospherically-corrected reflectance in the red, near-infrared, and blue wavebands; the normalized difference vegetation index (NDVI), which provides continuity with NOAA's AVHRR NDVI time series record for historical and climate applications, and the enhanced vegetation index (EVI), which minimizes ...

5 天之前 · Vegetation indices measure the amount of green vegetation over a given area and can be used to assess vegetation health. A commonly-used vegetation index is the Normalized Difference Vegetation Index (NDVI), which uses the difference between near-infrared (NIR) and red reflectance divided by their sum.

This dataset contains a gridded daily Normalized Difference Vegetation Index (NDVI) derived from the Surface Reflectance Climate Data Record (CDR). The data record spans from 1981 to 10 days before the present using data from NOAA polar orbiting satellites [Advanced Very High Resolution Radiometer (AVHRR) and the Visible Infrared Imaging ...

2023年8月24日 · The Normalized Difference Vegetation Index (NDVI) derived from the Advanced Very High Resolution Radiometer (AVHRR) instruments has been crucial to study global vegetation dynamics and their spatio-temporal variation. The AVHRR dataset is a unique legacy dataset that possesses a long period of record (>40 years).

Today, scientists use NASA satellites to map the "greenness" of all Earth's lands. These vegetation index maps show where and how much green leaf vegetation was growing for the time period shown. Welcome to NASA Earth Observations, where you can browse and download imagery of satellite data from NASAs Earth Observing System.

2024年1月16日 · 归一化植被指数(ndvi)能够表征陆面植被覆盖和植被生长状况，是植被宏观监测的重要指标。目前ndvi长时间序列数据产品主要有三种：spot ndvi、modis ndvi(mod13和myd13系列)、gimms ndvi。

归一化植被指数 (ndvi)能够表征陆面植被覆盖和植被生长状况，是植被宏观监测的重要指标。 目前NDVI长时间序列数据产品主要有三种： SPOT NDVI 、 MODIS NDVI (MOD13和MYD13系列)、GIMMS NDVI

2023年9月4日 · Normalized Difference Vegetation Index (NDVI) values are derived from surface reflectance data acquired by the Advanced Very High Resolution Radiometer (AVHRR) sensor. By applying knowledge gathered over time about instrument performance and sensor characteristics, the data are reprocessed to create consistent long-term records, allowing ...

2025年3月22日 · 归一化植被指数，是反映农作物长势和营养信息的重要参数之一，应用于遥感影像。ndvi是通过植被在近红外波段（nir）和红光波段（r）的反射率差异来计算的，用于评估地表植被的覆盖和生长情况。 计算公式 ：ndvi = (nir - r) / (nir + r)。其中，nir为近红外波段的反射值，r为红光波段的反射值。