Data for "A progressive and combined building simplification approach with local structure classification and backtracking strategy"

It is a data for paper named "A progressive and combined building simplification approach with local structure classification and backtracking strategy". Three datasets are provided. One is the original data, which is collected from an open data product named OS Open Map –Local and provided by Ordnance Survey. Another two datasets are buildings which are simplified based on the original dataset into scales of 1: 25, 000 and 1: 50, 000. The simplification approach are proposed in the paper "A progressive and combined building simplification approach with local structure classification and backtracking strategy" .