Convert WGS84UTM coordinates to HK1980GRID coordinates

Convert WGS84UTM coordinates to HK1980GRID coordinates

WGS84UTM_TO_HK1980GRID(N, E, zone)

Arguments

N	Numerical, Northern coordinate in meters.
E	Numerical, Eastern coordinate in meters.
zone	Numerical, either 49 or 50.

Details

This function converts the coordinates to WGS84GO, and then to HK80GO and eventually to HK1980GRID.

Value

N

Numerical, Northern coordinate in meters.

E

Numerical, Eastern coordinate in meters.

References

Survey & Mapping Office Lands Department, Hong Kong Government (1995). Explanatory Notes on Geodetic Datums in Hong Kong, available at: http://www.geodetic.gov.hk/smo/gsi/data/pdf/explanatorynotes.pdf

Author

Jinlong Zhang

Note

The coordinates should be within the range of Hong Kong. Providing coordinates outside Hong Kong will lead to wrong results.

See also

HK1980GRID_TO_WGS84UTM

Examples

options(digits = 15)
WGS84UTM_TO_HK1980GRID(2471279, 205494, zone = 50)
#>                  N                E
#> 1 820347.647263194 832591.689923123
#### $N
#### [1] 820347.647263194
#### 
#### $E
#### [1] 832591.689923123

######################
#### Results from http://www.geodetic.gov.hk/smo/tform/tform.aspx
#### 820351.389, 832591.320