WGS84GEO_TO_HK80GEO {HK80}

Convert WGS84GEO coordinates to HK80GEO coordinates

Description

Convert WGS84GEO coordinates to HK80GEO coordinates

Usage

WGS84GEO_TO_HK80GEO(latitude, longitude)

Arguments

latitude

latitude in decimal degrees

longitude

longitude in decimal degrees

Details

This function uses the simplified relationship between WGS84GEO and HK80GEO. See Page C4 on the explanatory note.

Value

latitude

latitude in decimal degrees

longtitude

longitude in decimal degrees

Note

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

Author(s)

Jinlong Zhang

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

See Also

HK80GEO_TO_WGS84GEO

Examples

options(digits = 15)
WGS84GEO_TO_HK80GEO(22.322172084,  	114.141187917)
#### $latitude
#### [1] 22.3236998617778
#### 
#### $longitude
#### [1] 114.138743472556

#### Answer from the online conversion tool
#### http://www.geodetic.gov.hk/smo/tform/tform.aspx
#### 22.323701767,  114.138734989