【摘要】 为解决林地面积测量计算的难题 ,作者通过对各种面积量算方法的比较研究 ,总结了各种量算方法的优缺点和适应性 ,比较了仪器实测与图上量测林地面积精度之间的关系 ,得知图上量测林地面积的精度因存在不可避免的系统误差而比仪器实测林地面积的精度低 .最后 ,该文着重推导了利用三次样条法测定林地面积的数学原理 ,并对梯形公式法、辛普生法、等距三次样条法和三次样条法对于林地面积边界不规则曲线的拟合原理进行了分析比较 .结合对中国科协北京绿化基地地块同精度的GPS测量试验结果 ,与运用上述 4种方法量算面积的精度结果进行比较 ,得知三次样条法量算林地面积的精度最高 ,且便于实时差分GPS(RTDGPS)作业 .更多还原

【Abstract】 In order to increase the accuracy of forestland area calculation, the authors compare several calculating methods, and compare the accuracies of surveying with instrument and those of measuring on map for forestland area. Results show that the accuracy of the former is higher, because the latter fails to eliminate the system error. At last, the authors emphasize on deducing Cubic Spline to survey forestland area, comparing simulation theories of ladder_shaped formula, Simpson formula, equate_interval Cubic Spline formula and Cubic Spline for the irregular curve of forestland area. Through the test on experimental plots of Chinese Science Society, the authors analyze the accuracies of above_mentioned four methods, and conclude that Cubic Spline has the highest accuracy and is convenient for RTD GPS operation.更多还原