等值线图是研究水文地质条件的重要条件。其种类繁多,例如有反映地下水位、埋深、涌水量、开采强度、渗透性能、水化学性质及含水层构造等指标的等值线图。编制这些图件,过去一直采用手编方法,利用观测点与周围最邻近点的实测指标值作线性插值,一一处理所有测点,最后作出等值线图。如果测点多时,这种工作相当耗费时间人力,又因采用的是线性插值,它即不能反映点间的非线性变化,也不能全面考虑所有点 Contour map is an important condition for studying hydrogeological conditions. For example, there is a contour map that reflects such indicators as groundwater level, depth, water inflow, mining intensity, permeability, water chemistry and aquifer structure. The preparation of these maps, the past has been using hand-knitted method, the use of observation points and the nearest neighbor of the measured index value for linear interpolation, one by one to deal with all measuring points, and finally make the contour map. If the measuring point is long, this kind of work takes a lot of time and manpower. Because of using linear interpolation, it can not reflect the non-linear change between points and can not fully consider all the points