GB/T 32738-2016 in English
VALIDSpecifications for 1: 50,000 and 1: 100 000 soil mapping digitalization
- Issued on:2016-08-29
- Implemented on:2017-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 32738-2016土壤制图 1：50 000和1：100 000土壤图数字化规范》由TC404（全国土壤质量标准化技术委员会）归口，主管部门为农业农村部。
Introduction
Interpretation of the National Standard of the People's Republic of China GB/T 32738—2016 Digital Specification for Soil Mapping
Background and Significance of Standard Formulation
Soil is an important component of the Earth's ecosystem, and its distribution and characteristics have a profound impact on agriculture, environmental protection and land use. With the rapid development of geographic information technology, digital soil mapping has become a key technology in modern soil science research and application.
GB/T 32738—2016 "Digital Specification for Soil Mapping" specifies the technical requirements for the entire process from scanning vectorization to quality control for the digitization of soil maps at a scale of 1:50,000 and 1:100,000. The formulation of this standard aims to unify the standards for digital soil maps and ensure the accuracy and comparability of data.
Comparative Analysis of Standard Frameworks
| Standard Dimensions | 1:50000 Scale Requirements | 1:100000 Scale Requirements | Differences and Characteristics |
|---|---|---|---|
| Scanning Resolution | ≥300 DPI | ≥300 DPI | No difference, unified requirements |
| Plane Position Accuracy | ±0.75mm (Flat Land, Hills) | ±0.75mm (Flat Land, Hills) | No difference, unified standards |
| Vector data collection | Polygonal surface feature closure | Polygonal surface feature closure | No difference, unified requirements |
| Database naming rules | County (district) administrative division name or code | National basic scale topographic map tile numbering | According to different map units, adopt corresponding standards |
Implementation suggestions and application cases
Case: 1:50000 soil map digitization operation process of a certain area
Step 1: Production of working base map
- Use the scanning vectorization method to ensure that the scanning resolution is ≥300 DPI.
- Perform image enhancement to improve the clarity of soil boundaries.
Step 2: Feature collection and attribute entry
- Plane features (such as soil type and water system) must be closed, and there should be no obvious disconnection in the polygonal boundary.
- Point features (such as soil profile points) are manually positioned to ensure that the position deviation is ≤0.1mm.
- Attribute data is entered according to the structure of Table 3, including code, name, classification information, etc.
Step 3: Quality control and inspection
- Position accuracy check: the deviation between vector features and raster maps is ≤0.15mm (linear features).
- Logical consistency check: ensure that the topological relationship between points and surfaces is correct, and no identification points are missed.
- Data completeness check: ensure that all features are fully covered and there are no major omissions.
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