System Fields

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After creating a new dataset, the system will generate a series of default fields. Considering the system default fields of datasets with different engines are different. Taking the UDB data source for example, the system default fields of distinct datasets will be illustrated.

 

Default Field of Point Dataset

Field Name Filed Description
SMID The number of unique identifier.
SMX The X-coordinate value of the point object.
SMY The Y-coordinate value of the point object.
SMLIBTIL Sheet index number.
SMUSERID Reserved field. User can customize its content.
SMGEOMETRYSIZE The size of the storage space of the object. Unit is bit.

 

Default Field of Line Dataset

Field Name Filed Description
SMID The number of unique identifier.
SMLENGTH The length of the line object.
SMSDRIW The left (west) coordinate of the bounding box of the line object.
SMSDRIN The up (north) coordinate of the bounding box of the line object.
SMSDRIE The right (east) coordinate of the bounding box of the line object.
SMSDRIS The bottom (south) coordinate of the bounding box of the line object.
SMUSERID Reserved field. User can customize its content.
SMTOPOERROR Topology error field indicates whether the object has a topological error. Different field value ​​represents different topological errors.
SMGEOMETRYSIZE The size of the storage space of the object. Unit is bit.

 

Default Field of Region Dataset

Field Name Filed Description
SMID The number of unique identifier.
SMSDRIW The left (west) coordinate of the bounding box of the region object.
SMSDRIN The up (north) coordinate of the bounding box of the region object.
SMSDRIE The right (east) coordinate of the bounding box of the region object.
SMSDRIS The bottom (south) coordinate of the bounding box of the region object.
SMUSERID Reserved field. User can customize its content.
SMARE Area of the region object.
SMPERIMETER Perimeter of the region object.
SMGEOMETRYSIZE The size of the storage space of the object. Unit is bit.

 

Default Field of Text Dataset

Field Name Filed Description
SMID The number of unique identifier.
SMSDRIW The left (west) coordinate of the bounding box of the text object.
SMSDRIN The up (north) coordinate of the bounding box of the text object.
SMSDRIE The right (east) coordinate of the bounding box of the text object.
SMSDRIS The bottom (south) coordinate of the bounding box of the text object.
SMUSERID Reserved field. User can customize its content.
SMGEOMETRYSIZE The size of the storage space of the object. Unit is bit.

 

Default Field of the Composite Dataset

Field Name Filed Description
SMID The number of unique identifier.
SMSDRIW The left (west) coordinate of the bounding box of the Composite object.
SMSDRIN The up (north) coordinate of the bounding box of the Composite object.
SMSDRIE The right (east) coordinate of the bounding box of the Composite object.
SMSDRIS The down (south) coordinate of the bounding box of the Composite object.
SMUSERID Reserved field. User can customize its content.
SMGEOTYPE Different letters represent different types of geometric objects such as points, lines, ellipses, rectangles, circles and so on.
SMLIBTIL Sheet index number.
SMGEOMETRYSIZE The size of the storage space of the object. Unit is bit.

 

Default Field of 3D Point Dataset

Field Name Filed Description
SMID The number of unique identifier.
SMX The X-coordinate value of the point object.
SMY The Y-coordinate value of the point object.
SMZ The Z-coordinate value of the point object.
SMUSERID Reserved field. User can customize its content.
SMGEOMETRYSIZE The size of the storage space of the object. Unit is bit.

 

Default Field of 3D Line Dataset

Field Name Filed Description
SMID The number of unique identifier.
SMLENGTH The length of the line object.
SMSDRIW The left (west) coordinate of the bounding box of the line object.
SMSDRIN The up (north) coordinate of the bounding box of the line object.
SMSDRIE The right (east) coordinate of the bounding box of the line object.
SMSDRIS The bottom (south) coordinate of the bounding box of the line object.
SMUSERID Reserved field. User can customize its content.
SMTOPOERROR Topology error field indicates whether the object has a topological error. Different field value ​​represents different topological errors.
SMGEOMETRYSIZE The size of the storage space of the object. Unit is bit.

 

Default Field of 3D Region Dataset

Field Name Filed Description
SMID The number of unique identifier.
SMSDRIW The left (west) coordinate of the bounding box of the region object.
SMSDRIN The up (north) coordinate of the bounding box of the region object.
SMSDRIE The right (east) coordinate of the bounding box of the region object.
SMSDRIS The bottom (south) coordinate of the bounding box of the region object.
SMUSERID Reserved field. User can customize its content.
SMARE Area of the region object.
SMPERIMETER Perimeter of the region object.
SMGEOMETRYSIZE The size of the storage space of the object. Unit is bit.