Diffuse Reflectance Standard Calibration Target Package (T4P-R125)
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Leadtime 0-10 weeks. Please contact us for current lead time on this product.
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MAPIR offers our durable Diffuse Reflectance Standard Calibration Target Package (T4-R125), which contains 4 PRO reference standard targets of known reflectance. Percent reflectance measurements from 350-2500nm were made using calibrated spectrometers. 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 Chloros 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 percentage (data download here).
All T4P targets are able to get wet and will maintain their listed reflectance when dried. The PRO reflectance targets are composed of a specially painted aluminum sheet. The painted surface is cleanable with a soft brush and water, making them perfect for outdoor and dirty environments. 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) |
| 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) | |
| 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) | |
| 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)
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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). It's polypropylene plastic resists chemicals while protecting the internals from moisture. 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).
To use the target, simply capture a photo of the entire open package, making sure the QR side and the 4 target side are visible. Try to make sure no harsh/dark shadows intrude on the white outer perimeter of the QR label, rotating the target as needed. Full capturing tutorial here.
Using our Chloros or MAPIR Cloud software you can provide photos of this target package and the QR fiducial pattern should be automatically detected, regardless of 3D pose. The pixel values from the targets will be measured and calibration formulas will be calculated. The reflectance calibration will then be applied to the remainder of your images until a new target image is found (depends on recalibration setting value). An unlimited number of target images can be used to correct your images for reflectance over time and across various lighting environments (i.e. cloudy days). In order to fully calibrate the images for reflectance you will need the log from our ambient light sensors (DAQ-A-SD, DAQ-M). Using the image viewer in Chloros you can calculate the raster/index images (for example NDVI) and then apply a color map (LUT).
Automatic Target Pixel Sampling At Any Angle
Specifications:
Total Closed Dimensions: 12.2" x 15.1" x 2.8" (30.99 x 38.35 x 7.11 cm)
Total Open Dimensions: 23.75" x 15.1" x 1.8" (60.33 x 38.35 x 4.60 cm)
Each Target: 5.0" x 5.0" (125 x 125 mm)
Weight: 4.37 lbs (1.98 kg)
Buoyancy: 9 lbs
Weight Capacity: 15 lbs
100% MADE IN THE USA
IP67 Waterproof
Impact resistant
Compliant with airline ATA-300 specifications
Automatic pressure equalization system
UPC: 00815120021411
Included:
(1pc) Diffuse Reflectance Standard Calibration Target Package (T4P-R125), containing 4 measured reflectance standard targets and an identification QR label
(2pcs) Plastic locking keys
