Category Archives: SUA photography

L1 20C MF calibration

With the camera set to manual mode, aperture at f8, shutter at 1/8th with focus set to infinity. The aircraft gimbal was set to lock on exposure. With manual focus set to infinity, the calibration characteristics are similar to the … Continue reading

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L1 20c Calibration

The Mavic 2 pro camera is known to be photogrammetrically capable. The constraints of the electronic shutter are known and the GSD is covered here: https://billboyheritagesurvey.wordpress.com/2019/05/01/mavic-pro-2-gsd8mm/ Getting optimum modelling from it requires a calibration. Below find the results of a … Continue reading

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Mapping with the Mavic

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Aerial mapping with the Mavic 2 Pro for 1:200 sale topographic survey is possible and the theoretical GSD is adequate. As the Mavic has no DGPS capacity GCPs are essential. Issues of image resolution, GPS/barometric heighting* and autonomous mission control … Continue reading

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PfCO, CAP 722 & the 50m bubble

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A new edition of CAP722. Following discussion with PfCO holders  I have been looking at the prohibited space restriction as published in the July 2019 edition of CAP722: The hatched area are those zones in which small UAS flight is … Continue reading

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Drone head/ KAP head

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I am a little surprised at how operating SUA has changed my approach to low level aerial photography. In theory, with a drone I can wait for the light, launch, shoot and bag the frame I want. In practice this … Continue reading

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MP2 Swath size

There are probably better ways of getting a handle on how high to fly the Mavic Pro2 but seeing the numbers is how I like to work, the sequence of scales is obvious and the ceiling of 120m AGL is … Continue reading

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Mavic Pro 2: GSD & map scale

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The relationship between GSD and map scale is simple in theory but the practice of getting sharp ortho results such that they function as a photo-map is not so straightforward. From the excellent Pix4D support pages: The printing scale indicates … Continue reading

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Mavic Pro 2 GSD=8mm

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The Mavic 2Pro’s L1D-20c camera has photogrammetric potential. To establish flight parameters for 1:200 scale mapping with it an effective minimum ceiling and shot interval need to be tested. In theory this is a simple application of the photo-scale equation … Continue reading

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Why KAP is different to SUA photography

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Positioning a camera by kite is a straight forward affair. You can either get over your subject or you can’t. The camera lies on the path between you and the kite and although catenary or slack line comes into play … Continue reading

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L1D-20c at 50m AGL

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At 50m AGL GSD is 1.17 cm/px f4, iso 100, 1/100th 120% screen grab: B

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