HJ 724-2014 in English
VALIDTechnical specification for environmental spatial data processing
- Issued on:2014-12-25
- Implemented on:2015-03-01
- File Format:PDF
- Delivery:Via email within 5 business days
$1,300.00
| Standard No: | HJ 724-2014 |
| Document status: | VALID |
| Title in English: | Technical specification for environmental spatial data processing |
| Title in Chinese: | 环境基础空间数据加工处理技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2014-12-25 |
| Implemented on: | 2015-03-01 |
| Professional Classification: | HJ-Environment |
| Related Keywords: | environmental spatial data
basic environmental spatial data environmental thematic spatial data establishes spatial data organization attribute data structure |
| Related Topics: | hj 698 2014
hj 734 2014 data processing tools Environmental basis Test technology data processing Environmental detection data hj2014 hj 692 2014 blank data processing hj 710.8 2014 data processing tools Environmental data instrument |
本标准规定了常用的环境基础空间数据制作的数据分类、属性数据描述方法、数据组织、存储格式、数据分层、符号规范、基础配色方案、数据采集更新规则、数据质量控制规则等内容。
本标准适用于环境信息化建设工作中对环境基础空间数据的加工处理。
Introduction
Analysis of the core content of the standard
| Technical module | Key points of the specification | Implementation requirements |
|---|---|---|
| Data classification system | Three-level classification structure (category-major category-minor category) Coding rule: 1 letter + 6 digits | A classification extension filing mechanism needs to be established |
| Attribute data structure | Three types of attribute items: • Basic attributes (identification code/geometric features) • Extended attributes (classification/description/association) • Business attributes | Field naming adopts the pinyin initials combination method |
| Spatial data organization | Layering principles: • The same topological features are layered independently • Scale code (AK) • Layer naming: Pinyin abbreviation_geometry type | Big data volumes need to be stored in partitions |
Key technical requirements
1. Coordinate system specifications
It is mandatory that new data after July 2008 use the CGCS2000 coordinate system, and the projection method is determined according to the scale:
- 1:1 million: Lambert projection (6° zoning)
- 1:250,000-1:500,000: Gauss-Krüger projection (6° zoning)
- Large scale: Gauss-Krüger projection (3° zoning)
2. Symbolization scheme
Point symbols use three levels of identification:
• Shape indicates major categories
• Color indicates medium categories
• Internal mark indicates minor categories
Color scheme for area data:
• Border color indicates medium categories
• Fill style indicates minor categories/levels
Implementation suggestions
Data quality control
Establish a three-level inspection mechanism:
- Computer automatic inspection: topological relationships, attribute value domains
- Manual inspection: feature integrity, annotation accuracy
- Version management: retain historical versions of important data
Update strategy
The "5+2" update mode is recommended:
| Basic terrain data | Fully updated every 5 years |
| Environmental thematic data | Dynamic update every 2 years |
Standard Evolution Analysis
This standard constructs a full-process technical framework for environmental spatial data for the first time. Its innovations include:
- For the first time, it clearly defines the distinction between basic environmental spatial data and environmental thematic spatial data
- Establishes a mapping relationship with basic geographic standards such as GB/T 13923
- Proposes a method for designing attribute data structure based on business characteristics
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