LiDAR Targets
There's only one style of calibration target that MetriCal supports for LiDAR sensors: the Circle Target.
Super-DIY
We're confident that you can build this one. All you'll need for this target type is some good retroreflective tape (something like this) and a circle template. Lucky for you, templates can be found in the MetriCal Premade Targets repository on GitLab.
Circle Target
This target is just a retroreflective ring! This target type is required to perform any calibration with a LiDAR. If it looks simple, that's because it is.
Using Multiple Circle Targets
When using multiple circle targets, MetriCal requires that the radii of the circles be at least 10cm different from each other. If the radii are too similar, the calibration may fail or produce incorrect results.
| Field | Type | Description |
|---|---|---|
radius | float | The radius of the circle, in meters. Measured to the circle's outer edge. |
detect_interior_points | boolean | Whether to use the LiDAR points detected within the circle bounds as part of the optimization. Doing so will produce Interior Points to Plane Metrics |
reflective_tape_width | float | (Optional) The width of the circular retroreflective tape, in meters. Used as a hint during circle detection. Defaults to 5cm |