方格法测量土方量精度的研究

运用误差传播定律分析方格网法计算土方量的理论精度,结果表明:(1)在距离为100m范围内,水准仪、经纬仪和全站仪测量地面高程、方格法计算土石方量的相对中误差分别为4%、8%和2%。(2)随着测量仪器精度的提高,土地平整过程中土方量测量计算的容许误差应由过去的10%提高到6%。(3)用反距离加权插值法计算方格顶点高程可提高方格网法计算土方量的精度。

Precision analysis of earthwork count using square grid method

In this paper,the theoretic precision of the measure of the earthwork volulme is analyzed using the law of error propogation. The results show that (1)while measuring the tertian elevation and calculating the earthwork volume within a span of 100 m, the relative middle error of leveling, stadia measurement, and total station optical electronic tacheometric theodolite is 4%, 8% and 2%, respectively.(2)h suggests that the allowable error of the earthwork count should be limited within 6%, not 10% we supposed, with the precision of the measuring instruments improved.(3)It could improve the precision of earthwork count using square grid method with the way of inverse distance weighted interpolation.