Convert WGS84UTM coordinates to HK80GEO coordinates

WGS84UTM_TO_HK80GEO(N, E, zone)

Arguments

N	Numeric, The northern coordinate
E	Numeric, The eastern coordinate
zone	zone, numeric, either 49 or 50

Details

This function converts the coordinates first to WGS84GEO and then to HK80GEO.

Value

latitude

latitude in decimal degrees

longitude

longitude in decimal degrees

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.

Examples


options(digits = 15)
WGS84UTM_TO_HK80GEO(2471279, 205494, zone = 50)
#>          latitude        longitude
#> 1 22.323667977877 114.138738570444

#### $latitude
#### [1] 22.323667977877
#### 
#### $longitude
#### [1] 114.138738570444

#### Results from http://www.geodetic.gov.hk/smo/tform/tform.aspx
#### 22.323701767
#### 114.138734989