基于数模的土方计算系统开发

Earthwork Calculation System Based on DTM

针对传统的方格网计算方法精度不高,其成果的表现力不理想等问题,介绍了基于三角网数模(DTM)进行土方计算的思路,主要包括土方计算散点坐标文件的生成、土方量的计算和土方量统计的原理和实现方法,并利用M FC和O b jectARX技术完成了相应的程序开发。实际应用表明,该系统具有土方计算精度高,且精度只与原始资料的精度有关的特点。

The accuracy of the traditional calculation method of earthwork is of low accuracy and the calculation result lacks visualization. In order to resolve these problems, this paper introduces a new method of earthwork calculation based on DTM, including treatment of grid points, delaunay triangulation and re-triangulation for the combined original terrain, designed surface and grid points, as well as earthwork calculation from each triangle pairs. This paper also finishes the corresponding computer software developed by MFC and ObjectARX under AutoCAD. As it proves, the most important feature of this method is that the accuracy of earthwork calculation is only raw datum related and free of man-made disturbance, namely, the higher the accuracy of raw datum, the higher the accuracy of earthwork calculation.