Mapir Camera Reflectance Calibration Ground Target Package Multispectral Cameras
MAPIR multispectral imaging camera sensors can be attached on to drones to enable farmers, agriculturalists, etc to effectively manage crops, soil, fertilising, irrigation, etc. MAPIR Survey3 cameras are compact, affordable and come with a range of 6 filter and 2 lens angle options. The cameras are widely used for checking a wide range of vegetation, mineral & burn indices.
In order to correctly utilise the cameras it is essential to ensure that the images are correctly calibrated for use with image processing software. We therefore highly recommend that you purchase the Mapir Camera Reflectance Calibration Target to complete your system. The Mapir Camera Reflectance Calibration Ground Target Package contains 4 ground targets that each have known reflectance curves. The target material is composed of a felt-like material mounted to a plastic substrate. It can be captured from any angle with your camera thanks to similar total and diffuse reflection properties.
To use this target, before each flight take a photo using each camera of the entire open package with the targets facing straight up (with no shadows on the entire target area). These images can then be used with Mapir's post processing software (contact SeeSense for detailed links and information) and then calibrate the index image pixel values. This will further improve the normalisation of your surveys over time and locations. Contact SeeSense for the full tutorial.
Caution: The material used for the targets is similar to felt and thus must be kept debris-free to work correctly. It is recommended to hold your drone over the target or taking off away from it and then hovering overhead in order to reduce the amount of debris that may land on the target. A hovering height of around 3-5 metres is recommended while trying to keep the target in the centre of the camera's view. The target material's diffuse properties means that you do not need to worry about camera orientation to get good results. The detection pattern (fiducial) is also much lower in resolution making detecting in our post processing software much easier, even with images having high noise (typically near-infrared wavelengths). Reflective measurements were made using multiple Shimadzu spectrophotometers incorporating an integrating sphere.
By using Mapir's Mapir Camera Control (MCC) software you can select the photo of this target taken before your survey, the fiducial pattern will be auto-detected and the reflectance value of each target will be calculated and applied to each of your images. The resulting individual images will then be calibrated and you can generate your ortho-mosaic in the software of your choosing. You can also calibrate the entire ortho, or groups of orthos. Using the Viewer tab in MCC you can calculate the rastor/index images (for example NDVI) and then apply your color map (lut).
Mapir use this same package to create the default values in the Calibration step of our post processing software for Survey model cameras. While the base calibration may work well for perfectly clear sunny days, in order to fully normalize your surveys we recommend using this ground target package each flight.
Dimensions: 31.75cm x 25.4 x 3.18 cm)
DRONE MOUNTS & ACCESSORIES
A comprehensive range of tilting and static drone mounts are available for payloads of app to four cameras. These include generic, DJI Mavic, DJI Phantom, DJI Inspire, DJI Matrice, Nimbus, 3DR Solo, 3DR Iris+ and 3DR X8 mounts. Other accessories include a reluctance calibration ground target (RECOMMENDED), advanced GPS receiver, cable options, etc. Please refer to the DATASHEET.
- 4 x 'felt-like' target
- Lower resolution fiducial (detection) pattern
BASIC SPECIFICATIONS (Full details in datasheet BELOW)
|Ground Sample Distance||3 - 5 metres|
|Dimensions||31.75 x 25.5 x 36.28 cm|
MAPIR - MAPPING THE INVISIBLE
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