The number of sensors that can be fitted and/or have been specifically designed to be fitted to drones is expanding rapidly. This chapter provides an overview of the various types of sensors used on drones for conservation research and monitoring, including RGB cameras, multispectral and hyperspectral cameras, and thermal imaging cameras. Increasing miniaturization means LiDAR and synthetic aperture radar (SAR) sensors can now also be fitted to drones, and they are also discussed briefly, as are a number of other types (e.g. acoustic and gas sensors) now being developed. Because most conservation researchers will start with a specific question and then explore which sensor or set of sensors will be suitable for their data collection, we approach the sensor issue from the application end. Some technical information on the sensors is provided as well as an overview of the various studies that they have been used for.
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