The invention discloses a distributed hydrological model digitalization method for a complex underlying surface
city area. The method comprises the following steps of performing basic data collectingand sorting; performing site survey; performing drainage area division; performing sub water
catchment area division; performing sub water catchment unit refinement; performing flow collection point generalization; performing drainage pipeline (network) generalization; performing drainage
system refinement
processing; and performing model digitalization input. The method has the advantages that through high-precision generalization and digitalization
processing, the authenticity and reliability of data, needed to be input, of a distributed hydrological model are realized, and actual underlyingsurface conditions of the
city area are restored and simulated as far as possible; the method can be applied to the model digitalization input of the multi-
land use type cross distribution city built-up area; and by virtue of an ArcGIS technology and an RS technology, the generalization precision of digitalization of sub water catchment regions and drainage systems in a city range is improved, and the technical problems of hydrological
process simulation and the like of the distributed hydrological model in the large-scale complex underlying surface city built-up area under the background ofstrong human activity influence are solved.