HK80UTM_TO_WGS84GEO: Convert HK80UTM coordinates to WGS84GEO coordinates
In helixcn/HK80: Conversion Tools for HK80 Geographical Coordinate System

Description Usage Arguments Details Value Note Author(s) References See Also Examples

Convert HK80UTM coordinates to WGS84GEO coordinates

1	HK80UTM_TO_WGS84GEO(N, E, zone)

`N`	Numeric, Northern coordinate in meters
`E`	Numeric, Eastern coordinate in meters
`zone`	zone, UTM zone number, for Hong Kong, either 49 or 50

This function converts the HK80UTM coordinates into WGS84UTM coordinates first, and convert the intermediate results into WGS84GEO coordinates (latitude and longitude)

`latitude`	latitude in decimal degrees
`longitude`	longitude in decimal degrees

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

Jinlong Zhang

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

WGS84GEO_TO_HK80UTM

#### The similar conversion is not available 
#### at http://www.geodetic.gov.hk/smo/tform/tform.aspx
#### Therefore, its accuracy is unknown.
options(digits = 15)
HK80UTM_TO_WGS84GEO(N = 2471279, E = 205494, zone = 50)