Convert HK1980GRID coordinates to WGS84UTM coordinates

Convert HK1980GRID coordinates to WGS84UTM coordinates

HK1980GRID_TO_WGS84UTM(N, E)

Arguments

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

Details

This function converts the HK1980GRID coordinates to HK80 geographical coordinates (latitude and longitude ) first, and then converts the later to HK80UTM coordinates, and eventually converts the HK80UTM coordinates to WGS84UTM.

Value

N

Northern coordinate in meters

E

Eastern coordinate in meters

zone

Zone

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

WGS84UTM_TO_HK1980GRID

Examples

options(digits = 15)
HK1980GRID_TO_WGS84UTM(820351.389, 832591.320)
#>                  N                E zone
#> 1 2471278.72371238 205493.220852789   50

#### $N
#### [1] 2471278.72371238
#### 
#### $E
#### [1] 205493.220852789
#### 
#### $zone
#### [1] 50

######################################
#### Answer from the online Conversion tool
#### http://www.geodetic.gov.hk/smo/tform/tform.aspx
#### 50Q   2471279   205494