Python遥感图像处理应用篇

1.数据描述

NDVI用于量化植被的绿色度，有助于了解植被密度和评估植物健康的变化。 NDVI按传统方式计算为红色(R)和近红外(NIR)归一化值:  

NDVI=(NIR - R) / (NIR + R)

In Landsat 4-7, NDVI = (Band 4 – Band 3) / (Band 4 + Band 3).

In Landsat 8, NDVI = (Band 5 – Band 4) / (Band 5 + Band 4).

本文数据位Landsat8NDVI数据，基本信息如下：

Landsat Surface Reflectance-derived Normalized Difference Vegetation Index (NDVI) Specifications

Attribute	Value
Long Name	Normalized Difference Vegetation Index
Short Name	LC8NDVI, LE7NDVI, LT5NDVI, or LT4NDVI
File Name	*_sr_ndvi.tif
Data Type	Signed 16-bit Integer
Units	Spectral Index (Band Ratio)
Valid Range	-10,000 — 10,000
Fill Value	Collection 2: -1