2.2　Symbols

2.2.1　The following provisions for symbols shall be observed for survey:

a——fixed error

b——scale error coefficient

D——distance between adjacent points

d——distance between adjacent straight-line stakes or tower location stakes

DEM——Digital Elevation Model

DJ6，DJ2，DJ1——grades of optical theodolite series

DS10，DS3，DS1——grades of level series

fk——principal distance of aerial camera

GPS——Satellite Positioning Survey

n——number of measured legs，points or survey stations

RTK GPS——real-time，dynamic satellite positioning survey

S——side length，leg length，route length，side length of house

WGS84——World Geodetic System

Ws——linear misclosure

WX，WY，WZ——misclosure components

σ——standard deviation of baseline

Δd——transverse offset distance.

2.2.2　The following provisions for symbols shall be observed for geotechnical investigation:

b——base width

d——diameter or side length of a pile shaft

g——gravitational acceleration

p——value of stress due to the self-weight of soil mass

δz——additional stress at the depth σz in the subgrade.

2.2.3　The following provisions for symbols shall be observed for engineering hydrological investigation and surveying:

Cv——coefficient of variation

Cs——skewness coefficient

n——roughness.

2.2.4　The following provisions for symbols shall be observed for engineering meteorological investigation and surveying:

B——design ice thickness

B0——standard ice thickness

V10min——10-min average maximum wind speed

VTmin——2-min average or instantaneous maximum wind speed.