Urban inland inundation model construction method based on CAD engineering drawing information and computation sheet of pipe network design

The invention provides an urban inland inundation model construction method based on CAD engineering drawing information and a computation sheet of pipe network design, and belongs to the crossing field of municipal engineering information technology and geographic information system technology. Existing computation sheet information of rainwater pipe network design is used to realize effective automatic conversion of rainwater pipe network model data to a GIS database, so as to provide convenience for construction of an urban inland inundation model. Fussy hierarchical processing on CAD graphic data according to elements by a conventional pipe network model construction method is greatly simplified, and manual entry workload on attribute data is reduced, and disadvantages of fussy operation, low efficiency, and easy mistakes of conventional manual attribute data entry are prevented. Just the computation sheet of rainwater pipe network design needs simple processing, and working efficiency is greatly improved, so as to ensure GIS quality of pipe network model data, and ensure quality of an urban inland inundation model. The method has maneuverability, and by simple operation in a GIS platform, each step can be completed, and implementation of the method is ensured.