GoPro Frame Quadrat

GoPro Frame Quadrat

by: Paul Illsley

1 X 1 metre quadrat made from inch CPVC tubing
Dimentions: 1.04 m X 1.04 m X 0.79 m tall

GoPro Hero2 camera in GoPro underwater housing with camera tripod mount attached
A GoPro LCD BacPac is a very useful addition to consider

Parts list ( inch CPVC tubing):
GoPro Hero2 camera, underwater housing and tripod mount
24 cm X 4 cm X 0.5 cm thick nylon camera mounting plate
90 degree elbows (8)
T adaptors (8)
8 cm tubes (8)
49 cm base tubes (8)
85 cm leg tubes (4) (100 cm for GoPro 3 underwater)
nylon 2 inch bolts and nuts (4)
nylon 1.5 inch bolt and nut (1)
nylon washers (10)
140 mm nylon cable ties (lots of them)

24 cm X 4 cm X 0.5 cm thick nylon camera mounting plate ( inch holes)

Camera mounted on the top platform (viewed from below)

Method of securing each section of the frame (nylon cable ties through inch drilled holes)
(recommended if you plan on using the frame in the field or underwater)
You will need to file off the sharp edges of the ties after you have snipped them to length (a bit of tape also helps)
You could use nylon nuts and bolts if you wish

Image recorded with the GoPro2 camera mounted on the quadrat frame

The same image after lens distortion has been corrected
Ground resolution in the study area is 0.43 mm / pixel

Software used for correcting lens distortion (PTLens)

What happens when you take it underwater?

Because the angle of view decreases underwater, some of the quadrat is cut off.
The magnification appears to be 1.4 times that of the above water image.


These images were submitted by Sam Meacham (Diving Safety Officer and Research Scientist at The Meadows Center for Water and the Environment in Texas, USA).

Sam used 1 metre legs to give a good height for underwater still images.
Sam reports it does clip the image if you use the GoPro 3 on video mode but it works very well for 12 MP still images.

Frame with 1 metre leg length (for GoPro 3)
Photo: Sam Meacham

View of the 1 X 1 metre quadrat with 1 metre legs (for GoPro 3)
Photo: Sam Meacham

For more information contact: Paul Illsley