Flight pattern: Flight lines should be straight, parallel to each other, and at a single altitude.
Altitude: Minimum 200 feet up to a maximum of 400 feet. Fly above 200 feet if more than one battery or more than 100 images is required to cover the site, to a maximum of 400 feet.
Coverage: Set your flight plan for a minimum coverage of 250 meters by 250 meters. Make sure the captured imagery fully covers the area of interest, as well as extends beyond it by 1 or 2 flightlines in each direction.
Camera orientation: The camera should be oriented so that it is pointed straight down while capturing imagery.
Front overlap: 75% required
Side overlap: 70% required
Exposure setting: Auto-Exposure
Exposure Bias: 0.0
White-balance: Sunny (even in cloudy conditions)
You must fly 2 hours after sunrise and last imagery should be 2 hours before sunset to ensure sufficient lighting.
For sites with major elevation changes:
Figure out where the highest point is on the site and fly at 400 ft AGL above that highest point. If you will be taking off at a lower location such as 100 ft below highest point you will need to fly the site at 500 ft AGL to maintain our overlap spec at 400ft AGL.
You can also use a flight/mapping app that has a terrain aware feature.