Abstract: In order to improve forest land area measurement of forestry production survey precision and work efficiency, handheld GPS in forest land area measurement exists some problems such as data point selection method and vector method, it proposes GPS forest area measure method based on Android. It constructs the evaluation function and defines two selection principles, based on multi-objective optimization principle, it reduces the number of points while ensuring accuracy of GPS points. It uses the azimuth angle and the area of the spherical distance to calculate area avoiding the error which caused by latitude and longitude coordinates transformation when it realizes vector method calculating the polygon area. Measure results show that the method can satisfy the requirement of forest land area measurement, and accuracy is higher than common method.

Key words: Global Positioning System（GPS） accuracy, drift points eliminating, multi-objective optimization, area measurement

摘要： 为提高林业生产调查中林地面积测量的精度和工作效率，针对目前手持GPS进行林地面积测量数据点处理和通过坐标转换计算面积容易引入误差的不足，提出一种基于Android平台的GPS林地面积测量方法。该方法一方面基于多目标优化原理构造评价函数并定义两条筛选原则，在保证采样点精度和曲率的情况下尽量减少点数量；另一方面在实现向量法时，根据方位角和球面距离计算面积，避免经纬度坐标转换引起的误差。实际测量结果表明，该方法能完全满足林地面积测量要求，且精度高于常规坐标转换法。

关键词: 全球定位系统（GPS）精确度, 漂移点剔除, 多目标优化, 面积测量