Chapter 7

Satellite Remote Sensing in Precision Agriculture

UAV Versus Satellite Imagery

Images from satellites and UAVs (also referred to as drones) are usually considered complementary technologies. However, each has its own use cases, benefits, and challenges. Listed below are the key differences between UAV and satellite imagery that one should consider before using.

Coverage Area. Satellites cover a much larger area than UAVs. It makes satellite imagery ideal for monitoring large farms and regions. UAVs are used for smaller areas or fields.
Frequency. Satellites capture images regularly while flying around the Earth along their orbit. Depending on the satellite type and speed, an image of a specific area is taken once every 1 to 14 days, providing farmers with a continuous stream of data about their land and crops. Still, the usability of those images depends on cloud cover. UAV imagery is typically captured less frequently, primarily upon need during the critical crop development phases, and requires physical flights managed manually.
Resolution. UAVs capture images at much higher resolutions than satellites, thus providing more detailed information about crops and soil. Satellites offer broader coverage yet lower spatial resolution, which limits the ability to detect more details.

UAVs and satellites are difficult to compare, as each has its purpose and addresses specific needs and use cases. Satellite imagery is ideal for monitoring extensive farmland areas, offering continuous coverage over time and being cost-effective. On the other hand, UAV imagery excels at capturing high-resolution images of smaller areas, providing detailed information where and when needed

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