A Comparative Study of Different Normalized Difference Vegetation Indices from the Wide Band Spectral Imager of Tiangong Ⅱ, China

摘要

The Wide Band Spectral Imager (WBSI) onboard the Tiangong-Ⅱ space lab of China launched in 2016 has five near-infrared bands and four red bands, which provides a good opportunity to compare the NDVI differences derived from the different combination of broadband redear-infrared bands. In this work, one WBSI image acquired on March 18, 2017 was used to study the different NDVI differences from the different combination of the red and near-infrared bands in the Yellow River Delta of China. The results indicated that the NDVI based on the red band at 750 nm (the WBSI Band 6) had a steep distribution, and was not suitable for mapping and classifying land cover. When the red band was the same, the mean, standard deviation, median NDVI value and the CC decreases with the spectral wavelength of near-infrared band decreasing. While the near-infrared band was the same, the mean, standard deviation, median NDVI value and the CC increases with the spectral wavelength of red band decreasing. The NDVI derived from bands comparable to those of Landsat TM (NDVI_(820/665)) had a multimodal histogram distribution, and was most suitable to map and classify land cover.