植被指数2（Vegetation index 2）.docVIP

植被指数2（Vegetation index 2） Edit this paragraph concept The index increased rapidly with the increase in strangeness. 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 understanding: 1, healthy green vegetation in the reflection of the NIR and R of relatively large differences, the reason is that R is strong absorption for green plants, NIR is the high reflectivity and transmission; 2, the establishment of vegetation index is effectively integrated the spectral signal, enhanced vegetation information, reduce the non vegetation information 3, vegetation index has obvious regional and timeliness, affected by the vegetation itself, environment and atmosphere conditions Edit this paragraph RVI - ratio vegetation index RVI=NIR/R, or the ratio of two bands of r