How to create NDWI on ArcGIS 10.8.2

Описание: How to create NDWI on ArcGIS 10.8.2 #gis #howto #mapping #trending #erdasimagine #remotesensing
  NDWI is use for the water bodies analysis. The index uses Green and Near infra-red bands of remote sensing images. The NDWI can enhance water information efficiently in most cases. It is sensitive to build-up land and result in over-estimated water bodies. The NDWI products can be used in conjunction with NDVI change products to assess context of apparent change areas.
This index uses the near infrared (NIR) and the Short-Wave infrared (SWIR) bands. NDWI can be calculated by following formula:
NDWI = (NIR – SWIR) / (NIR + SWIR)
For Landsat 7 data, NDWI = (Band 4 – Band 5) / (Band 4 + Band 5)
For Landsat 8 data, NDWI = (Band 5 – Band 6) / (Band 5 + Band 6)
But result appear form above formula is poor in quality. The pure water neither reflects NIR nor SWIR. The formula of NDWI then modified by Xu (2005). It uses Green and SWIR band.


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