Estimating
Flying a parking lot with a drone: a map you can price from
How to fly a parking lot with a drone so the map is good enough to price from: a grid flight, overlap, height, light, an empty lot and a tape check.
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Try it on one of your own jobs.
Draw a lot you priced last month, price it with your own numbers, and see what it would have made. Free for 14 days, no credit card.