Is anyone measuring the volume of concrete being poured into new home construction foundations and comparing them to take off plans?

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Hello everyone. First post here.

Before I receive answer's for this specific question let me please fill you on with what was asked of me and a brief background history. I work for a 3rd party quality control inspection company as a UAV operator. My usual task are to do final roof inspections, 3D Models, Photo and video Marketing and editing. Occasionally I will use our DroneDeploy business account to do volume-metrics. Our clients typically do not get request calculations. However, two days ago our client (A home builder company) asked us if we could examine the footing depth versus the foundation concrete that's poured to provide accurate measurements. There are a few reasons as to why they want to do this. One being they want to make sure footings are not over dug. Two being they usually accept the concrete pour tickets with no real way to check. and three there is no point in paying for excess material when its not called for in the plans of the foundation. Now that you may have a brief oversight of the situation and understanding here comes the question.

Is anyone in the industry doing these calculations? I would like a better understanding when measuring the volumes (negatively) because I am trying to get the depth from dronedeploy by putting the area fence on the forms. with metal and post tension on my maps I would say I'm getting close but I'm about 5 cubic yards off from exact plans. If I can dial this in or figure out the best time to measure (perhaps its better without post tension cables and metal in maps) we could fulfill the service requested. Below are attached pictures showing one of the sites that I am trying to measure, pre-foundation pour. In laymen's terms, I just need a way to measure how much material will be used to fill this hole.

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No replies? I think it's obvious.
Don't know how can you do this with a drone.
Why don't you do that simply on the ground with manual measuring?
 
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We have done some volume calculations on a much larger scale, and that experience tells me perhaps Drone Deploy may not be able to measure a shallow depth change. We use Pix4D and have not been able to measure a depth change of less than one foot with confidence. We place 4', 6', and 8' posts at the same places each time in the target area , together with ground targets, also located at the same place every time.
 
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Well, I'm cross posted in CommercialPilots under construction. Seems like most people only see it as impossible. So far I have been able to calculate about a 5cubic yard variance. "Why don't you do that simply on the ground with manual measuring? " - Andy9. To be honest I have no problem doing that but the home builder specifically asked me to try with the drone. Obviously its faster to fly several sites and measure than it would be to manually check every foundation that's about to be poured. Kinda of a no brainer and I think that's why the construction industry is growing in drone services so rapidly. I can imagine It wont be very long for someone to figure out how to calculate with a at minimum 5% variance. Not to mention If the homebuilders out there don't trust the concrete pours in the foundations (no real way to check currently how much is being poured, builders just receive a pour ticket $$$) then there's a reason to have us keep things in check if we can calculate close enough. Not to mention I wouldn't complain about being hired for years to check hundreds of divisions of foundations across the US and be so busy I would have a crew of pilots to hire and support more limited UAV positions.
 

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