There are many algorithms of earthwork calculation.
土方量计算有多种算法。
Earthwork calculation is often encountered in building the water projects.
土方计算是工程中经常碰到的问题。
In construction of hydroelectric project, small range DTM data are often needed for topographic surveying, mapping, excavated form detection, earthwork calculation and so on.
水利水电工程施工过程中常常需要获得一些小范围的DTM数据，用于地形测绘、开挖形态监测及工程土石方量计算等。
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