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１森林面积调查与监测 基本思路是按照可持续森林经营标准和指标，以石狩川示范林为对象，研究利用卫星数据调查和监测森林面积的方法，探讨高分辩率卫片的应用前景。研究工作分为流域调查和重点调查两部分。流域调查选在石狩川中下游，面积约 ５０万 ｈｍ２。重点调查的面积为
1 The basic idea of forest area survey and monitoring is to study the methods of using satellite data to survey and monitor the forest area according to the sustainable forest management standards and indicators and to study the application prospect of high-resolution satellite. The research work is divided into two parts: watershed investigation and key investigation. Watershed survey selected Ishikawa middle and lower reaches, an area of about 500000 hm2. The key survey area is