A new spectral index to detect Poaceae grass abundance in Mongolian grasslands

作者：Shimada S^*; Matsumoto J; Sekiyama A; Aosier B; Yokohana M

来源：Advances in Space Research, 2012, 50(9): 1266-1273.

DOI：10.1016/j.asr.2012.07.001

• Mongolian grassland
• Normalized difference indices
• Poaceae abundance index
• Spectroradiometer

The objectives of the present study were to develop a new index based on remotely-sensed data for detecting the abundance of grasses in the family Poaceae, which has a high palatability for livestock in Mongolia, and to map the distribution of these grasses in the semi-arid Mongolian steppes. We measured ground-based spectral reflectance of pure plant leaves including Poaceae grasses and soils, as well as in-situ in the Mongolian grasslands. The hyper-spectral data, taken by a spectroradiometer, were converted into four multi-spectral bands (i.e., blue, green, red, and NIR) to simulate satellite-based imagery data. In order to magnify the characteristics of the spectral signal of Poaceae, NGBDI (Normalized Green-Blue Difference Index), NGRDI (Normalized Green-Red Difference Index), NDVI (Normalized Difference Vegetation Index), NNBDI (Normalized NIR-Blue Difference Index) were calculated from the four multi-spectral reflectance values. Poaceae Abundance Index (PAL) was derived by combining these four normalized difference indices. PAI was found out to be a good indicator to discriminate Poaceae grass from the other plant spectral data.

• 出版日期2012-11-1