Feature Description
This function exports point, line, region, text datasets, and attribute tables to China Standard Vector Exchange Format - VCT files.
The Ministry of Land and Resources established the land use data exchange format based on the national standard "Geospatial Data Exchange Format" (GB/T17798-2007). Land use data exclusively describes vector data with .vct extension, enabling geographic information exchange across land resource sectors. The VCT vector data exchange format is widely used for submitting land use survey results, land use planning achievements, and cadastral survey database exchanges. For detailed VCT parameter descriptions, refer to the VCT File page.
- Supports exporting VCT data in three versions: cnsdtf_vct 1.0 (VCT1.0), landuse_vct 2.0 (VCT2.0), and landuse_vct 3.0 (VCT3.0).
- Allows exporting multiple datasets into a single VCT file.
- Supports exporting to VCT files by importing existing .xml configuration files with layer type settings.
Feature Entry
- Click Start tab -> Data Processing -> Data Export button;
- In Workspace Manager -> Right-click data source or dataset -> Select Export Dataset;
- Toolbox -> Data Export -> Export Vector -> Export to VCT.
Steps
- In Data Export dialog, select China Standard Vector Exchange Format from Export Type dropdown for target datasets. The right panel displays VCT export parameters.
- Set VCT Version: Select export version from cnsdtf_vct 1.0, landuse_vct 2.0, or landuse_vct 3.0.
- Configure VCT Layer: Configuration parameters vary slightly across versions:
- Select export datasets: Click Select to open Select Dataset dialog. Use Add button to load multiple datasets from same datasource for combined export.
- Two configuration methods available:
- Import configuration file: Apply existing config file to export datasets.
- Custom configuration: Click Configure to open Configure VCT Layer dialog. Configuration requirements differ by VCT version:
- For CNSDTF_VCT 1.0, the Configure VCT Layer (1.0) dialog appears:
- Displays dataset name and datasource in Dataset and Datasource fields.
- VCT Type: Set target VCT type for export. Presets 47 types including boundary points, survey control points, and administrative regions. Select appropriate type from dropdown.
To add custom types, modify the layer configuration file at: InstallationPath\Templates\Conversion\vctDataType.xml.
- Layer type configuration:
- Open vctDataType.xml. Each layer type contains: FeatureID (element code), LayerName (feature name), and TabularName (attribute table name). Example: Boundary point layer has FeatureID 2006030100, LayerName "Boundary Point", and TabularName "JZD".
Modify the file following these rules. Restart iDesktopX to access new layer types in VCT Type dropdown.
- Open vctDataType.xml. Each layer type contains: FeatureID (element code), LayerName (feature name), and TabularName (attribute table name). Example: Boundary point layer has FeatureID 2006030100, LayerName "Boundary Point", and TabularName "JZD".
- Layer type configuration:
- VCT Fields: After setting VCT type, double-click VCT Field to open Select Field dialog. Configure export fields by selecting checkboxes and modifying type, length, and precision.
- VCT Field Name: Exported field name from dataset.
- VCT Type: Select from Char, Integer, Float, Date, Time, Varbin.
- VCT Field Length: Define field length. Unspecified when 0 or empty.
- VCT Field Precision: Set precision. Unspecified when 0 or empty.
- For LANDUSE_VCT 2.0, the Configure VCT Layer (2.0) dialog adds topology settings for region layers:
- Topology: Specify line datasets topological with exported region datasets. Both line and region datasets must be exported together. Example: Establishing topology between Administrative Region and Administrative Boundaries Annotation requires exporting both.
- With topology: Split Administrative Region line IDs in VCT's LineBegin/LineEnd use line feature codes.
- Without topology: Split line IDs use region feature codes.
- Topology: Specify line datasets topological with exported region datasets. Both line and region datasets must be exported together. Example: Establishing topology between Administrative Region and Administrative Boundaries Annotation requires exporting both.
- For LANDUSE_VCT 3.0, the Configure VCT Layer (3.0) dialog offers topology options: Direct Coordinate Plane, Indirect Coordinate Plane (Line-based), and Indirect Coordinate Plane (Region-based).
- Charset: Select character encoding for export. Default: ASCII. Use UTF-8 for Chinese characters or Unicode for cross-platform compatibility. See Charset List for supported encodings.
- Complete VCT Type and Field configurations, click OK to save. Finally, click Export in Data Export dialog to generate VCT file.
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