Tree density
This is a big concern in forestry, since higher density tree stands may render some individuals less able to pick up nutrients. They can then die back/dry out. And this can make a forest prone to wildfires. Multispectral data can be used as the foundation of NDVI analysis of areas to determine biomass and forest density. This is a huge improvement over terrestrial methods which assumed a studied area would resemble the rest of the forest.
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