Shiro TSUYUZAKI
Plant community ecology / Environmental conservation
Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily
(Update on July 6, 2005)
Vegetation index (VI)
An indicator index that is used to evaluate green vegetation.
Green plants absorb photosynthetically active radiation (PAR) for photosynthesis that consists of various wavelengths (see below). We apply the plant characteristics to estimate plant cover. That is NDVI.
NDVI and related parameters
Table. Reflection characteristics of vegetation
| High absorption rate |
400-500 nm (blue) & 620-690 nm (red) |
= chlorophyll absorption bands |
| High reflection rate |
720-1200 nm |
|
| Satellite |
Sensor |
Detecting wavelength |
| LANDSAT/MSS |
MSS7 band |
600-700 nm |
|
MSS5 band |
800-1100 nm |
| Index |
Abbreviation |
Equation |
Note |
| Relative vegetation index |
RVI |
= MSS7 / MSS5 |
|
| Difference vegetation index |
DVI |
= MSS7 - MSS5 |
|
| Weighted difference vegetation index |
DVIW |
= 2.40 x MSS7 - MSS5 |
|
| Normalized difference vegetation index |
NDVI |
= (MSS7 - MSS5) / (MSS7 + MSS5) |
Range: -1 - +1 |
References
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