Drones with multispectral cameras

The colors we can see are basically defined by the wavelength of light. Plants absorb and reflect light in different ways, according to the wavelength incident upon them. Crops typically absorb blue and red light, reflecting the vast infinity of other spectrums that are invisible to the human eye. The reflected waves can be captured by appropriately equipped drones that record a specific spectral band. The vast majority of cameras on the market are of the conventional type — RGB sensors. When used in drones, these sensors require an infrared filter attached to the camera to capture some spectral bands. These conventional models cause some contamination in the information, which can saturate certain vegetation indices and not correctly represent the crop. The most modern model, the hyperspectral camera, consists of multiple sensors, each of which has a specific, extremely high-quality, and high-resolution filter. In this way, measurements are much more precise and with less noise compared to conventional cameras that require conversion by attached filters — the conventional model. Multispectral cameras can individualize each of the captured colors (blue, green, red, etc.). In addition, they capture all invisible colors, such as infrared and RedEdge — an electromagnetic spectrum of significant change in vegetation reflectance. Another major advantage of these modern cameras is the ability to adjust the color of the photo according to daylight, meaning it is possible to adjust the photos for cloudy or sunny days, ensuring very high definition regardless of weather conditions.