On the base of the DEM, the spatial distribution of flow directions, watershed boundaries and stream networks of Tangwanghe Catchment were studied.

根据DEM数据，确定了汤旺河流域的地表水流方向、集水区的划分及水系网络空间分布特征。

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In this paper, the procedures of a spatial information system for Houzhaihe catchment at Puding in Guizhou province have been discussed detailedly.

本文，以后寨河流域为例，阐述了水文模型空间数据库的建立过程。

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