4.2 GIS based hydrological models

Hydrological models，which are integrated with GIS software so called aGIS-based modeling system，providing users with useful interfaces，can becategorized into three classes depending on the GIS tool： ①distributed hydrological model systems based on commercial GIS software，②open-source GISsoftware based distributed hydrological model system，and ③distributedhydrological model system independent of GIS software.

(1) Distributed hydrological model systems based on commercialGIS software

Well-known distributed hydrological models like ArcSWAT are developed on the commercial software ArcGIS (Schuol et al.，2008)，which canprovide good integration for model building and greatly decrease the modelingdifficulties for users.The spatial data calculation of ArcGIS is quite reliable ......     （共6247字）    [阅读本文]>>