植被指数（vegetation index）.docVIP

植被指数（vegetation index） An index that reflects the growth of a plant by combining data from different bands of the satellite. The leaves of the plant have strong absorption property in the visible red band, reflecting strong characteristics in the near infrared band, which is the physical basis of vegetation remote sensing monitoring, through different combinations of the two bands can be measured in different vegetation index. The difference vegetation index, also called agricultural vegetation index, is the difference between two channel reflectance. It is sensitive to soil background change and can identify vegetation and water body well. concept The index increased rapidly with increasing biomass. The ratio vegetation index, also called greenness, is the ratio of two channel reflectance, which can reflect the difference of vegetation coverage and growth status, especially for vegetation monitoring with high vegetation coverage and high vegetation coverage. The normalized difference vegetation index is the difference between the reflectance of the two channels divided by their sum. When the vegetation is in middle and low coverage, the index increases rapidly with the increase of coverage degree. After reaching a certain coverage, the growth rate is slow, so it is suitable for the dynamic monitoring of the early and middle stages of vegetation growth. The combination of blue, red and near infrared channel interference of atmospheric aerosols on vegetation index greatly eliminated, anti gas composition of the vegetation index can greatly improve the vegetation growth monitoring and crop yield estimation accuracy. Edit this paragraph detailed The vegetation index mainly reflects the difference between the vegetation reflectance in the visible and near infrared bands and the soil background. Each vegetation index can be used to quantitatively describe the growth of vegetation under certain conditions. In the learning and use of vegetation index must be some basic und