<?xml version="1.0"?> <model> <name>Checkerboard Plane</name> <version>1.0</version> <sdf version='1.6'>checkerboard_plane.sdf</sdf> <author> <name>Adam Allevato</name> <email>adam.d.allevato@gmail.com</email> </author> <description> A plane with a reference checkerboard texture on it, used to validate and calibrate camera models. The checkerboard is 8x8 squares (like a standard checkerboard), and measures 2m on each side. </description> </model>