Mapping Quality with Range of 200ft -1000ft

I might have a mapping project come up for around 280 Acres.

This would be over some buildings in ClassB air space.

My concern is keeping quality of doing a 3D map on Drone Deploy.

I will have some one story builds and some buildings all the way up to 1000 ft per info given in VFR Charts.

If you have a lot of variations in height during mapping how will this affect the quality?

Any suggestions on maintaining quality.

I also when I create the plan it says it will take 2530 pictures. When I ran the simulator it took over 3000 pictures. Which one is closer to being accurate?

Thanks as always for your support and comments

Sean Day

Where is the flight? Coords would be good

32° 46’ 47" N, 96° 45’ 8" W

Fair Park over the whole complex.

Thanks for your response

:sunglasses: Austin here! Dallas is tricky to fly in! Have you filed your waiver yet?

Just a quick look and it looks like the Class B like you said, but there is also another airport to notify coming from the southeast and two schools. Unfortunately the airspace elevation grid shows a 100ft cap over the whole park so keep you fingers crossed. Looking at the VFR map the highest structure is 596ft AGL, I think you might have looked at the MSL.


When I guessed at the extents and put it in DroneDeploy I got 278ac so pretty close and at 200ft AGL and 75/65 overlaps I get the following. If they let you fly that high.


If you are more interested in a good 3D model I would suggest the Crosshatch method. First it allows an oblique camera pitch so your vertical faces will be much crisper. Also, running obliques allows for lesser overlaps. It’s pretty much the same stats, but you are coming at everything from 4 different directions. The optimized flight direction looks like 44 degrees.


Really great info.

I still need to request for waiver but wanted a game plan before I did.

This will be tough keeping a line of sight. When I put my info in it said it would take 9 batteries

I like the cross hatch method. I need figure that out how to set that up.

Do you know what happens if the pics go over 3000? Drone Deploy says it will process a map up to 3000 images


Correct. Depending upon which plan you are on the upload allowances vary. You could contact support if you run into an issue, but in keeping with VLOS you might consider splitting the site into East and West halves. From there you can either upload all of the images into one map or process two maps and then combine them in QGIS. I hope you got a box of batteries!

How would you handle doing the project with the stadium with the alt 596ft?

Do stadium by it self at 700ft if clearance is given and then split the rest of the park in 2 east and west?

For what it’s worth I will be flying Mavic Pro 2


You might take a look at where the highest obstruction is because you may be able to get your flight plan around it. I would be a little leery at running higher than 400 ft, especially with the restriction zones that you are dealing with. if you have to I think it would be okay too do three flights as you said. 1 structure mode over the stadium. This will allow you to minimize the number of parallel passes that you have to do and will definitely create a nice model.

@Alpha1, did you ever get any further with this?

Thanks for asking

I had to go get a COA approval for 250’ from FAA. It was just approved this week. The highest building in that park is 212’

How were you able to do the crosshatch patterns? I’ve tried but not having much luck.

This was only way I could get one crossing line

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There is an app called Auto Flight Modes. Crosshatch is the only one I use since the other two are basically the normal map plan and the Structure Mode. On the crosshatch you can change the gimbal pitch. I think it defaults to 65deg, but I normally pull it down to 55deg if I really want to capture the vertical faces and make a nice model. I wouldn’t advise usually GCP’s as it can cause some warping (not much) because of trying to tag at oblique angles.


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