Définition
Multispectral imagery refers to satellite images that capture data from multiple spectral bands, which are different ranges of wavelengths of light. These images allow us to see different features on the Earth's surface in more detail, by providing information about the reflectance or absorption of different types of surfaces, such as vegetation, water, soil, and human-made structures.
Each spectral band captures a different type of information about the surface, such as the presence of chlorophyll in plants, the temperature of the surface, or the moisture content of soil. By combining the data from multiple spectral bands, we can create a more complete and nuanced picture of the Earth's surface.
Some common use cases for multispectral imagery include:
- Agriculture: Farmers can use multispectral imagery to monitor crop health and growth, detect pest infestations, and optimize irrigation.
- Forestry: Forest managers can use multispectral imagery to monitor tree health, detect invasive species, and identify areas of forest that are at risk of wildfire.
- Environmental monitoring: Multispectral imagery can be used to monitor changes in land use, detect water pollution, and track the movement of icebergs and glaciers.
- Urban planning: City planners can use multispectral imagery to analyze urban sprawl, monitor traffic patterns, and identify areas at risk of flooding or other natural disasters.
- Defense and security: Governments can use multispectral imagery for military reconnaissance, border surveillance, and disaster response.
