System Fields

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When you create a new data set, the system generates a series of default fields. Considering that the system default fields of data sets of different engines are different, here we take UDB data source as an example to illustrate the system default fields of different data sets.

 

Default Fields for Point Dataset

Field name Field description
SMID A sequence number that uniquely identifies the object.
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. Users can customize its content.
SMGEOMETRYSIZE The amount of space, in bits, used to store the object.

 

Default fields for line dataset

Field name Field description
SMID A sequence number that uniquely identifies the object.
SMLENGTH The length of the line object.
SMSDRIW The coordinate of the left (west) side of the line object's bounding rectangle.
SMSDRIN The coordinate above (north) the line object's bounding rectangle.
SMSDRIE The coordinate of the right (east) side of the line object's bounding rectangle.
SMSDRIS The coordinate below (south) of the line object's bounding rectangle.
SMUSERID Reserved field. Users can customize its content.
SMTOPOERROR Topology error field. Indicates whether the object has topology errors. Different field values represent different topology errors.
SMGEOMETRYSIZE The amount of space, in bits, used to store the object.

 

Default Fields for Polygon Dataset

Field name Field description
SMID A sequence number that uniquely identifies the object.
SMSDRIW The coordinate of the left (west) side of the polygon object's bounding rectangle.
SMSDRIN The coordinate above (north) the polygon object's bounding rectangle.
SMSDRIE The coordinate of the right (east) side of the polygon object's bounding rectangle.
SMSDRIS The coordinate below (south) of the polygon object's bounding rectangle.
SMUSERID Reserved field. Users can customize its content.
SMARE The area of the polygon object.
SMPERIMETER The circumference of the polygon object.
SMGEOMETRYSIZE The amount of space, in bits, used to store the object.

 

Default Fields for Text Dataset

Field name Field description
SMID A sequence number that uniquely identifies the object.
SMSDRIW Coordinates of the left (west) side of the text object's bounding rectangle.
SMSDRIN The coordinate above (north) the text object's bounding rectangle.
SMSDRIE Coordinates of the right (east) side of the text object's bounding rectangle.
SMSDRIS The coordinate below (south) of the text object's bounding rectangle.
SMUSERID Reserved field. Users can customize its content.
SMGEOMETRYSIZE The amount of space, in bits, used to store the object.

 

Default Fields for Compound Dataset

Field name Field description
SMID A sequence number that uniquely identifies the object.
SMSDRIW The coordinate to the left (west) of the compound object's bounding rectangle.
SMSDRIN The coordinate above (north) the compound object's bounding rectangle.
SMSDRIE The coordinate to the right (east) of the compound object's bounding rectangle.
SMSDRIS The coordinate below (south) of the compound object's bounding rectangle.
SMUSERID Reserved field. Users can customize its content.
SMGEOTYPE Different codes represent different types of geometric objects, such as points, polylines, ellipses, rectangles, circles, etc.
SMLIBTIL Sheet index number.
SMGEOMETRYSIZE The amount of space, in bits, used to store the object.

 

Default Fields for 3D Point Dataset

Field name Field description
SMID A sequence number that uniquely identifies the object.
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. Users can customize its content.
SMGEOMETRYSIZE The amount of space, in bits, used to store the object.

 

Default Fields for 3D Line Dataset

Field name Field description
SMID A sequence number that uniquely identifies the object.
SMLENGTH The length of the line object.
SMSDRIW The coordinate of the left (west) side of the line object's bounding rectangle.
SMSDRIN The coordinate above (north) the line object's bounding rectangle.
SMSDRIE The coordinate of the right (east) side of the line object's bounding rectangle.
SMSDRIS The coordinate below (south) of the line object's bounding rectangle.
SMUSERID Reserved field. Users can customize its content.
SMTOPOERROR Topology error field. Indicates whether the object has topology errors. Different field values represent different topology errors.
SMGEOMETRYSIZE The amount of space, in bits, used to store the object.

 

Default Fields for 3D Polygon Dataset

Field name Field description
SMID A sequence number that uniquely identifies the object.
SMSDRIW The coordinate of the left (west) side of the polygon object's bounding rectangle.
SMSDRIN The coordinate above (north) the polygon object's bounding rectangle.
SMSDRIE The coordinate of the right (east) side of the polygon object's bounding rectangle.
SMSDRIS The coordinate below (south) of the polygon object's bounding rectangle.
SMUSERID Reserved field. Users can customize its content.
SMARE The area of the polygon object.
SMPERIMETER The circumference of the polygon object.
SMGEOMETRYSIZE The amount of space, in bits, used to store the object.