Convert HK80GEO coordinates to WGS84GEO coordinates

Convert HK80GEO coordinates to WGS84GEO coordinates

HK80GEO_TO_WGS84GEO(latitude, longitude)

Arguments

latitude	latitude in decimal degrees
longitude	longitude in decimal degrees

Details

This function utilizes the simplified relationship between HK80GEO and WGS84GEO described on Page B6 to do the transformation.

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.

See also

WGS84GEO_TO_HK80GEO

Examples

options(digits = 15)
HK80GEO_TO_WGS84GEO(22.323701767, 114.138734989)
#>           latitude        longitude
#> 1 22.3221739892222 114.141179433444

### $latitude
### [1] 22.3221739892222
### 
### $longitude
### [1] 114.141179433444

### Answer from the online conversion tool
### 22.322172084
### 114.141187917