There can be some correlations made between aerial imagery and yields but the technology is not an accurate predictor of crop yields. Sensors used in agricultural aerial imagery can accurately sense the health of the plant. However consider the fact that just because some plants may appear to be less healthy it is possible that those plants may produce the highest yields. For example, the size of the ears of corn may vary in a field. Some ears may be 8 inches long while others are 14 inches long. Obviously the longer ears is more likely to produce more yield. For reasons like this it is not wise to depend upon any type of remote sensing as a true predictor of crop yield.
Multicopter drones like the Chinese DJI systems are good alternatives for small areas of less than 80 acres or so. Most of our customers are agronomists who use their AgEagle systems to provide a valuable service to their customers who are growers. The growers farm anywhere from 1,000 to several thousand acres. An AgEagle RX48 is typically used to scan 200 acres or more. AgEagle fixed wing drones are more reliable and robust than a Chinese drone. Because the AgEagle only requires one motor instead of four or more like a multicopter has, there is less to go wrong. Fewer parts mean more reliability. Also for the same reason you see more airplanes flying than helicopters, fixed wing airplanes are more energy efficient. An AgEagle RX48 will fly for 45 minutes at 33 mph which is why it can cover so much more ground than a multicopter.