在模型参数求取中应用了GIS的数字高程模型(DEM)功能将海图等深线通过线性内插得到与模型网格相匹配的具有栅格结构的水深数据(模型的主要参数)。
Water depth data (main parameters), which was matching to model's grid structure, was obtained by using the function of GIS digital elevation model (DEM) to linear-interpolate the isobath of chart.
通过对1934,1968和1992年的海图对比研究表明：近期乐清湾各等深线所围水域面积持续减小。
Comparing the water depth maps surveyed during 1934, 1968 and 1992, it is obvious that water areas enclosed by different water depth contours decreased continuously in the whole area of the bay.
通过对1934,1968和1992年的海图对比研究表明：近期乐清湾各等深线所围水域面积持续减小。
Comparing the water depth maps surveyed during 1934, 1968 and 1992, it is obvious that water areas enclosed by different water depth contours decreased continuously in the whole area of the bay.
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