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Missing a lot in the map

 Hi,

I flew over a small, flat area (a soccer field and a gravel field that lay side by side). I used Map Pilot on iOS and a Phantom 3 Pro. 80% coverage in the settings and lowest altitude, 40 meters). The flight went well, it was not windy. The Phantom flew straight and held height.

When I did the maps in Maps Made Easy, and compared it to a map I did with the same source images in AgiSoft Photoscan, the Maps Made Easy used only about 30% compared to Photoscans map.

The answer I got from support was that I should use Map Pilot, but I did use it.

It was a flat area, only a bench in the area, the rest was just flat ground with grass or gravel.

The processing shows no errors. The overlap report is good, the lowest value is green.

Why does it use so little of the images?

 

Robert Wiklund

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We have responded to all of your email support requests. Please make sure that your email address can get emails from our dronesmadeeasy.com

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Sorry to hear you aren't happy with the results. You have a couple of odd things going on here. All of your 18 images were included in the processing but it appears that your data was collected by free flying. This takes images at different speeds and causes the calculated camera calibration data to be off which results in an artificially flattened elevation map. You can see that your elevation had a very compressed range.

We trim the jagged edges off the map around the area the aircraft traveled. Since the calibration data was off the whole thing got trimmed a bit closer in that it would otherwise.

We highly recommend the use of our Map Pilot app for data collection to avoid these issues.

Jay
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No, it was not freeflying. I wrote that in the first post. I was using Map Pilot. 80% coverage in the settings, lowest altitude (40 meters). Speed was set in the middle, so around 7-10. Below is a screen shot from AgiSoft showing the route and position of the images Map Pilot did.

Robert Wiklund 0 votes
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Our processing is probably a lot more sensitive to changes in speed than other software but the results are more accurate when used properly.

The flattened and overtrimmed images occur when there is too much difference in the speed at which the images were taken.

In order to get the images to be taken at the same speed we recommend the use of Map Pilot and rotating the flight path such that it is perpendicular to the prevailing wind. Having the flight path aligned with the wind will lead to some pretty larger speed differentials between passes.

Jay 0 votes
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Hi,

Ok, thank's for suggesting adjusting the flight path according to the wind. It was not windy when taking the photos, and I had Map Pilot speed settings in the middle. Max is 15, so the speed should have been 7-8 at the time. I'll try to lower the speed even more next time.

Cheers,

 

Robert Wiklund 0 votes
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