图斑面积量算的精度分析

The Accuracy Analysis of Polygon Area Measurement

本文讨论了从图上或航空象片上用不同工具按不同方法量取图斑面积时的误差估算问题,并用大量实验数据对理论公式进行了验证,得到了几种主要的面积计量工具(数字化器、数字坐标仪、分划求积仪、格网片)的采样点精度参数和面积计量的精度估算式。最后认为:解析类工具计量面积的精度估算式均具有m_p=m·p^(1/2)的形式;用具有数据自动传输的解析类工具进行面积计量无需重复观测;把格网片当成解析类工具使用能有效地提高面积计量精度,同时建议采用本文所述方法确定各类工具的采样点误差参数,从而采用灵活而合理的限羞规定,以提高面积计量的作业效率。

This paper discusses the error estimate of polygon area measured on the map or airphotograph with various equipment by different methods, tests and verifies theoretical formulae with a great of experimental data, and farther more, finds accuracy parameter of the sampling points and auuracy estimating formulae of area measurement for some equipment (Digitizer, Digital-Coordinater, Integrating instrument, Grid-plate). Finally, auuracy estimating formulae of using all analytical equipment to measure area have the same form m_p=m·P^(1/2), and polygon area does not need to be measured once again when the analytical equipment, which can transmit data automatically, is ured, and auuracy of area measurement can be increased when Grid-plate is used as analytical equipment. Author also suggests that the method, introduced in this paper, are adopted to determine the sampling point error parameter of each measuring equipment in order to use different and rational to lerance standard and increase working efficiency of area measurement.