1.

The boundary point refers to the turning point of the parcel ownership boundary, that is, the turning point. It is an important symbol for demarcating the parcel ownership boundary.

Control points serve as data controls, including building height control points and pile position control points.

2. Building red lines are also called "building control lines", which refer to the boundaries in urban planning and management that control the frontage of buildings or structures (such as exterior walls, steps, etc.) along the streets on both sides of urban roads.

No building or structure fronting the street shall exceed the property line.

Different from the line connecting the boundary address points, the line connecting the boundary address points is the boundary address line, that is, the polyline or curve formed by the lines connecting the boundary address points.

3.1. For the accuracy of newly built commercial housing (including those that have not been measured before), the second level medium error is adopted, and the calculation formula is 0.02√S+0.001S.

2. For the error in the third level of accuracy of other real estate properties, the calculation formula is 0.04√S+0.003S.