<?xml version="1.0"?> <model> <name>Calibration Plane</name> <version>1.0</version> <sdf version='1.6'>calibration_plane.sdf</sdf> <author> <name>Adam Allevato</name> <email>adam.d.allevato@gmail.com</email> </author> <description> A plane with a reference texture on it depicting an asymmetrical circle pattern. Used to validate and calibrate camera models. The plane is 2m x 2m, and the circle grid size is 6x8. </description> </model>