On the architectural drawing, all the surface lines of land use in the general plan are placed on the YDM layer, and each surface line should be self-closed, and clear attributes (tag values) should be marked within the closed range; The tag value should be placed on the tag layer; The sum of all enclosed areas (excluding the area of FZM layer) shall be equal to the total land area.

The marked value codes of the land use range marked with different land use properties on YDM layer are as follows:

Value (code) comment of serial number attribute name

1 road NS N: stands for non-building (the same below).

2 grass brick numerical control

3 green land NG 1 gong * * green land

NG2 Other Greenland

4 motor vehicle parking land NP 1

NP2 non-motor vehicle

5 Waters Northeast

6 Northwest floor area of the structure

7 hard NK

8 Other NQ

The lighting part refers to the lighting lamp and lighting circuit, which belongs to the high-voltage line. Weak current lines refer to telecommunication cable, closed radio and television lines and residential telephone lines.

The power distribution system distributes power to each room through the distribution box, and the distribution box should have facilities such as short circuit, overload and leakage protection.