Description
MAPIR offers our durable Diffuse Reflectance Standard Calibration Target Package (T4-R125), which contains 4 reference standard targets of known reflectance. Diffuse and total reflectance percent measurements from 250-2500nm were made using multiple Shimadzu spectrophotometers incorporating an integrating sphere. The lambertian reflectance panels can be captured from any angle thanks to similar diffuse and total reflection properties, though capturing straight-on is recommended. Our computer vision software automatically finds the QR symbol in the target images and calculates the pixel to reflectance relationship using the known target material reflectance (data download here).
The reflectance targets are composed of a felt-like sheet material adhered to a plastic substrate. Care should be taken to ensure the targets are debris-free to produce the best calibration results, often a puff of air is all that is needed to clean them. The target’s housing is made of durable polypropylene plastic and the QR fiducial pattern material is a UV durable, laminated label.
| Package Model | Reference Target Dimensions | Recommended Capture Distance (Survey3W) | Recommended Capture Distance (Survey3N) |
| T4P-R25 | 1.0″ x 1.0″ (25 x 25 mm) | 4 in – 8 ft (0.1 – 2.4 m) | 10 in – 20 ft (0.3 – 6.0 m) |
| T4-R50 | 2.0″ x 2.0″ (50 x 50 mm) | 8 in – 16 ft (0.2 – 5.0 m) | 20 in – 40 ft (0.5 – 12.0 m) |
| T4-R125 | 5.0″ x 5.0″ (125 x 125 mm) | 20 in – 33 ft (0.5 – 10.0 m) | 40 in – 105 ft (1.0 – 32.0 m) |
The green outer case of the T4-R125 is impact resistant, crushproof, dustproof and IP67 waterproof (IP67 rating = waterproof to a depth of 1 meter for 30 minutes when latched). The built-in handle is easy to grip, rotates and is flexible. Both of the large hinged clasps close the halves securely. Twisting the black circular locks fastens the clasps to the case, and there are 2 additional keys included to further lock it. A large center hole between the handle also allows an additional padlock to be used (not included).
