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We describe the geometry, constraints and algorithmic implementation for metric rectification of planes. The rectification allows metric properties, such as angles and length ratios, to be measured on the world plane from a perspective image. The novel contributions are: first, that in a stratified context the various forms of providing metric information, which include a known angle, two equal though unknown angles, and a known length ratio; can all be represented as circular constraints ondoi:10.1109/cvpr.1998.698649 dblp:conf/cvpr/LiebowitzZ98 fatcat:6sh4eh74rbalnidasfyuoiulwe