This paper presents the usefulness of 'form-purification indices' for zoning preservation districts. Based on the concept of 'form-purification', the historical street-scape are classified into four categories: 'preservation district', 'district to be filled-up by traditional buildings', 'district to be filled-up by traditional streets' and 'district with studded cultural heritage'. The usefulness of the indices were examined through MonteCarlo simulations on a random distribution of traditional forms, and a field survey in the following three preservation districts: Narai, Ohmi-hachiman and Takayama, Japan. Based on the examinations, some alternative zoning and preservation policy are shown for each of the three districts.
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Yamamoto et al. (1999) studied this question.