Research And Implementation Of Geocoding System For Police Case Address

Geocoding converts the addresses description into latitude and longitude values,so that the addresses could be labeled on the map.It is an indispensable part of the police geographic information system.In the meanwhile,it is important for the standardized management of police business addresses,map annotation display and data mining analysis.This thesis studies the geocoding related technology,and combines the characteristics of the police address to design a set of geocoding schemes based on address standardization and retrieval matching.The problem is addressed as follows:(1)This thesis analyzes the structure of the police address.Based on the oral description features of the police address,and by analyzing the actual police address data,an address model based on POI(Point of Interest)is designed to determine the composition and standards of address elements.(2)This thesis designs a set of methods based on the combination of rules and Bi GRU+CRF model to extract various address element entities,which fully combined the advantages of the two address element entity extraction methods.When using the deep learning model,a large number of actual business addresses are marked,and Bi GRU is used for context feature extraction and CRF for serialized label output.After testing,this address element recognition extraction model has high recognition accuracy and recall rate.(3)This thesis uses Lucene to build a standard address library based on POI addresses.The standard address library is used to query and match input addresses.Based on the segmentation and extraction results of address elements and the standard address model,this thesis establishes a set of Lucene-based matching rules for querying input addresses.Besides,this thesis continues to infer the coordinate position of the obtained matching results in case the address contains inference information.(4)This thesis examines this system from two aspects,that is,functional testing and non-functional testing.After testing,it is found that the geocoding system established in this thesis can meet the accuracy requirements of the police address geocoding.Moreover,compared with the direct using of full-text search for original addresses,the result has been greatly improved.