如何用等高线计算土方量

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1709420,842374,1436745,457944,1464652,1852648,1512479,575924,1779646,1627232,251722,1340202,1585578,1372221,286874,1400380,1494244,153000,323411,392604,1860883,1496746,1755063,1767202,1714637,1783585,1700859,269533,588194,1296480) ORDER BY field (ArticleID,1709420,842374,1436745,457944,1464652,1852648,1512479,575924,1779646,1627232,251722,1340202,1585578,1372221,286874,1400380,1494244,153000,323411,392604,1860883,1496746,1755063,1767202,1714637,1783585,1700859,269533,588194,1296480)