GB/T 36625.4-2021

Smart city—Data fusion—Part 4: Opening and sharing requirements (English Version)

Standard No.

GB/T 36625.4-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 36625.4-2021

Scope

This part of GB/T36625 specifies the basic model, business requirements, characteristics and technical requirements of smart city data fusion, open sharing, etc. This part is applicable to standardize the opening and sharing of relevant data in the process of smart city data fusion. 2 Terms and Definitions

Introduction

Analysis of the core content of the standard

GB/T36625.4-2021, as the 4th part of the smart city data fusion series of standards, systematically standardizes the data openness and sharing requirements among government systems, urban infrastructure, enterprise information systems and personal terminals. The technical framework includes:

Dimension	Traditional mode	This standard mode
Data exchange method	One-way data reporting	Two-way platform interaction
Protocol compatibility	Primary private protocol	Standard protocol priority
Security control	Basic access control	Hierarchical encryption + desensitization processing

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Detailed explanation of key technical requirements

7.4 Data quality management system

The standard proposes six-dimensional quality indicators: completeness (missing rate ≤ 0.5%), consistency (format compliance rate ≥ 99%), accuracy (error rate ≤ 0.1%), timeliness (delay-sensitive data ≤ 1s), traceability (full-link log), and authenticity (digital signature verification).

7.7 Key points for data security implementation

Take traffic monitoring data sharing as an example:

• Level L1 (public data): Road condition video streams need to remove facial and license plate information
• Level L2 (restricted data): Traffic violation records require two-way encrypted transmission
• Level L3 (confidential data): Emergency command data uses quantum encryption channels

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Background of standard evolution

This standard responds to the requirements of the 2019 "National New Smart City Construction Guidance" to solve the data island" problem that existed in the early construction of smart cities. Compared with the 2018 pilot version, the main enhancements are:

1. Added personal terminal data rights and interests clauses
2. Cleared the mandatory requirements for metadata management
3. Detailed the QoS indicators for delay-sensitive services

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Implementation suggestions

Government agencies

It is recommended to establish a three-level data open directory: basic layer (unconditional sharing), thematic layer (authorized sharing), and sensitive layer (approval sharing).

Enterprise units

Key points to be improved:

• Data dictionary and standard metadata mapping table
• Heterogeneous system protocol conversion middleware
• Data lineage tracking system