**1.2.1 The definition of digital railway geographic information platform**

Geographic Information Platform of Digital Railway System is a foundation platform which takes railway spatial information database as the carrier, GIS technologies as the core, achieving railway spatial information and services sharing as the goal. It is responsible for collecting, storing, maintaining and managing of spatial information, which including railway public fundamental spatial information, sharable valuable professional spatial information and related spatial attributed data which gathering from business information systems. Geographic Information Platform also provides spatial information and related services which can be shared to business information systems.

China's railway information systems applied the concept of GIS in varying degrees, and some had already established the GIS subsystem [7], such as information system of permanent way works department (PWMIS), railway land management systems. Ministry of Railways also organize related units to study the overall framework and the programs of railway geographic information systems [8,9]. However, part of the railway business information system uses the different platforms for geographical information, and spatial information sources are not uniform, resulting in spatial information is inconsistent, maintenance workload continued substantial growth, and these are difficult to play overall

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Fig. 2. The Architecture of Digital Railway Geographic Information Platform

The services layer of railway geographic information platform is the critical part to achieve GIS services. The spatial information services layer serves the system and public, who have the needs for the entire railway geographic information and services, and build a unified, distributed, loosely coupled, space GIS services platform for the railway business functions and information services. Geographic information services layer is responsible for publishing the standard GIS services and GIS spatial analysis models managed by geographic information sharing platform, including spatial data visualization services, GIS data services, GIS functional service, GIS catalog services. In addition, GIS services can be based on the basic types, custom professional business space in different applications such as passenger and freight space-time statistical analysis of marketing services, and emergency evacuation paths used in service to meet business services for GIS analysis needs. needs. It will provide different

Railway geographic information platform interface layer is also the railway geographic information services portal, which provides geographic information services portal railway spatial information services available to search and locate. When the other system users develop a rail service system, or need to use a GIS data, services, he can log in railway

**Security System**

**standards and normative system**

**1.2.3.2 Service layer** 

services for outside and inside users.

**1.2.3.3 Interface layer** 

effectiveness. To this end, an urgent need to tidy plan the construction of Digital Railway from an unified, standardized aspect, and study an advanced application of scientific and rational, safe and reliable railway geographic information platform for railway infrastructure management and maintenance of spatial information, to provide specifications of the railway geospatial data and spatial information services for business information systems of the railway.
