WGS84GEO_TO_HK80GEO: Convert WGS84GEO coordinates to HK80GEO coordinates

In helixcn/HK80: Conversion Tools for HK80 Geographical Coordinate System

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

helixcn/HK80 documentation built on Aug. 13, 2021, 3:21 a.m.