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 at the limit of useful resolution for most of my work.

The 50m stand-off rule for persons, structures, vessels or vehicles not under the control of the RP requires a raised camera to get the ground cover. For true nadir the 102m swath at 80m AGL will cover the ‘missing’ 50m from the buffer zone edge. Obliques into the buffer zone from much lower down look like a better option to improve reso.

S W A T H   S I Z E   &   M A P   S C A L E

MP2

Nadir coverage

Height AGL (h)

S W A T H   S I Z E

Ground sample distance (GSD)

Approx.

map scale

Area sqm

X dist on ground

Y dist on ground

25m

688

32.16m

21.44m

6 mm/px

1:200

30m

875

35.08m

25.73m

7 mm/px

50m

2688

64.32m

42.88m

12 mm/px

 

1:500

60m

3927

77.19m

51.26m

14 mm/px

80m

6936

102.92m

68.61m

78 mm/px

1:1000

100m

10880

128.65m

85.76m

97 mm/px

1:1250

120m

15708

154.38m

102.92m

117 mm/px

1:2000

Sensor x

13.2 mm/5464 px

Sensor y

8.8 mm/3640 px

focal length (f)

10.26 mm

Dist X = (h/f)*sensor x mm

Dist Y = (h/f)*sensor y mm

GSD = [Sensor width (mm) * h (m)]/ [(focal length (mm) * Sensor width (px)]

The MP2 20mpx (28mm equivalent lens) camera delivers good reso for the weight and flight-time but is, inevitably compromised by its small sensor, GSD falls off rapidly with height. What the MP2pro gains on portability and flight time it looses in reso. Using the Inspire and Matrice aircraft with the KAP proven Ricoh GR comes at a steep price in terms of reduced flight time, transport bulk and great expense.

B

About billboyheritagesurvey

Heritage worker
Gallery | This entry was posted in SUA photography, Survey Practice and tagged , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.