extract concentration of chlorophyll from an image (small toolbox) downloaded images from "oceancolor" project powered by NASA

利用TM图像，反演各种海面环境因子，例如海面温度，泥沙含量，叶绿素a等。-TM image using the inversion of various sea environmental factors, such as sea surface temperature, sediment content, chlorophyll a and so on.

Normalized Difference Vegetation Index (NDVI) To determine the density of green on a patch of land, researchers must observe the distinct colors (wavelengths) of visible and near-infrared sunlight reflected by the plants. As can be seen through