2. Data and methods
2.1. Data
Crucial to this study was the collection of accurate data on
industrial enterprises. Shunyi’s economic records indicate there
was a total of 456 industrial enterprises in the district in 2005,
of which 126 were registered at district level or higher and 330
were registered at town level or lower. However, the economic
records contain no ready-made data on land-use by industrial
enterprise. To obtain comprehensive and continuous data, we
used several methods, including: