A multispectral image is one that captures image data at specific frequencies across the electromagnetic spectrum. The wavelengths may be separated by filters or by the use of instruments that are sensitive to particular wavelengths, including light from frequencies beyond the visible light range, such as infrared. By dividing the spectrum into many bands, spectral imaging can allow extraction of additional information the human eye fails to capture.
Bureau Stephan UAV's can be equipped with multispectral cameras to monitor agricultural and environmentally sensitive areas, making it easier to rapdily detect plant stress situations and other abnormalities. The advantage of this is a reduction of not just cost interms of materials, but an increase in efficiency and by extension profitability and reduced environmental impact. The spatial precision and temporal availability of UAV's can provide clients with specific and more precise information that will help clients make better decisions and save resources.
Depending on the task, the multispectral image can be represented in different ways; each one is going to give us specific information not only for agriculture but also for other fields.
Applications of multispectral images include:
(1) Crop Quality Indicators - Multispectral infrared images allow farmers to periodically study the health of their crops
(2) Inventory of Crop Areas - Allows for the accurate assessment of the abundance of a plant species over large and/or difficult to access areas
(3) Nutritional Stress Detection - Farmers are able visually identify patches of vegetative stress and apply specific doses of fertilizer/pesticides accordingly
(4) Early detection of plant diseases/pests - Enables the detection of changes in specific areas of crops to make it easier to identify plant diseases
(5) Yeild Estimation - By having a detailed overview of their crops farmers are able to better anticipate yeilds