Convert HK1980GRID coordinates to HK80UTM coordinates

Convert HK1980GRID coordinates to HK80UTM coordinates

HK1980GRID_TO_HK80UTM(N, E)

Arguments

N	Numeric, Northern coordinate in meters
E	Numeric, Eastern coordinate in meters

Details

This function converts the HK1980GRID coordinates into HK80GEO coordinates (latitude and longitude) first, and converts the later into HK80UTM coordinates.

Value

N

Northern coordinate in meters

E

Eastern coordinate in meters

zone

UTM zone number, either 49 or 50

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

HK80UTM_TO_HK1980GRID

Examples

##### This function was not tested since 
##### the conversion is not available on the manual nor online.
options(digits = 15)
HK1980GRID_TO_HK80UTM(832699, 836055)
#>                  N                E zone
#> 1 2483772.37965304 208931.715993119   50