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本文简单介绍了GPS概况,并根据美国、加拿大林业工作者的样地定位试验,说明了用差分法样地定位误差在10米之内。用自动选择连续测定加后处理(不用差分法)的方法误差在20米之内。不用后处理的其它直接测定方法误差在30米以上。林冠对GPS接受卫星信号有影响。用GPS样地定位比传统方法样地定位效率高。无样地定位经验的新手用GPS定位受益大。
This article briefly introduced the GPS overview, and based on the sample plots of forestry workers in the United States and Canada, it shows that the positioning error is within 10 meters with the difference method. Continuous measurement with automatic selection plus post-processing (no difference method) method error within 20 meters. Other direct measurement methods without post-processing error of 30 meters. Canopy GPS satellite signals have an impact. Positioning using GPS plots than the traditional method of location and high efficiency. Nothing to position the experience of novices with GPS positioning benefit.