What is "murerplan"

The Murerplan is a map of Zürich, printed in 1576 by Jos Murer (1530-1580). It was combined from six pearwood plates measuring 45 cm squared each. A smaller extra plate was made for the Grossmünster, which would otherwise have been divided between four plates. The original plates have not been preserved. The plates of a second edition of 1610 survive.