精准测定技术在固定样地复位调查中的应用

为解决国家森林资源连续清查体系中固定样地复位较难、固定样木测定精度不高的问题,采用手持GPS对固定样地定位、全站仪对固定样木测高、罗盘仪对固定样木复位的方法可以提高调查精度.结果表明:利用手持GPS进行固定样地的复位调查,可以使固定样地的复位率达到100%;利用全站仪可以使树高的测量精度提高到1%;利用罗盘仪可以使固定样木的复位率达到95%以上.同时采用手持GPS与PDA相结合,可实现数据的自动存储、实时显示,使样木位置坐标化,改变了传统的森林资源复查方法,大大提高了工作效率.

Application of precise surveying technology in replacement inventory of fixed sample plots.

To solve the difficulty of replacement for fixed sample plots and the lower precision for fixed sample tree mensuration in the system of national forest resources continual inventory,the precision of inventory can be improved using portable GPS in the position of fixed sample plots,using total station to mensurate the height of fixed trees and using compass in the replacement of fixed trees.Results indicate that the ratio of replacement can be improved up to 100% using portable GPS in the position of fixed sample plots,the precision of mensurating for tree height can be improved up to 1% using total station,and the ratio of replacement of fixed trees can be improved up to 95% using compass.At the same time,by combining the method of portable GPS with PDA,data storage can be realized and displayed automatically,the position of sample trees can be coordinated,which change the traditional method and greatly improve the efficiency of forestry resource inventory.