矢量河网渐进式传输的多尺度表达模型

A Multi-Scale Model for Progressive Transmission of River Network

矢量河网数据渐进式传输是制图综合的逆过程,从几何特征出发化简曲线的方法忽略了曲线的形态特征。鉴于此,以曲线轴线为基准,基于曲线弯曲层次化提取河流曲线数据,并将提取的曲线数据分层组织,构建结合目标层和几何细节层的河网多尺度表达模型。基于该模型开发了矢量河网数据的渐进式传输系统,验证了该方法的有效性。

The progressive transmission of vector river network data is the inverse process of cartographic generalization. The curve simplification methods based on geometric features ignore the morphological characteristics. In views of these problems, axis was used as a reference of curve, and river curve data were extracted hierarchically based on curve bends. The extracted data were organized hierarchically. The multi-scale model of river network was constructed by the level of object element and geometric detail. The progressive transmission system of river network was developed to verify the effectiveness of the method.