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  • NDBI简介及计算

    Normalized Difference Built-up Index (NDBI)

    用来分析建成区的指数有很多:

    Normalized Difference Built-up Index (NDBI)

    Built-up Index (BU)

    Urban Index (UI)

    Index-based Built-up Index (IBI)

    Enhanced Built-up and Bareness Index (EBBI)

    这些是最常用的,它们有各自的计算方法. 建成区和裸土在SWIR(短波红外)波段比在NIR(近红外)波段反射更多一些. 水体在红外波段几乎没有反射。

    For better result, you can use Built-up Index (BU). Build-up Index is the index for analysis of urban pattern using NDBI and NDVI. Built-up index is the binary image with only higher positive value indicates built-up and barren thus, allows BU to map the built-up area automatically.

    BU = NDBI - NDVI

    NDBI 计算:

    NDBI = (SWIR – NIR) / (SWIR + NIR)

    For Landsat 7 data, NDBI = (Band 5 – Band 4) / (Band 5 + Band 4)

    For Landsat 8 data, NDBI = (Band 6 – Band 5) / (Band 6 + Band 5)

    Also, the Normalize Difference Build-up Index value lies between -1 to +1.

    NDBI 负值代表水体,高值代表 建成区,植被的NDBI值比较低。

    ENVI中Band Math计算公式:float(b5-b4)/float(b5+b4)   或者 (float(b5)-float(b4))/(float(b5)+float(b4))

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  • 原文地址:https://www.cnblogs.com/icydengyw/p/12382706.html
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