HK1980GRID_TO_WGS84GEO: Convert HK1980GRID coordinates to WGS84GEO coordinates

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

Description

Convert HK1980GRID coordinates to WGS84GEO coordinates

Usage

HK1980GRID_TO_WGS84GEO(N, E)

Arguments

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

Details

This function converts the coordinates to HK80GEO first, and convert the later to WGS84GEO coordinates.

Value

latitude	latitude in decimal degrees
longitude	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

WGS84GEO_TO_HK1980GRID

Examples

options(digits = 15)
HK1980GRID_TO_WGS84GEO(820351.389, 832591.320)
#### $latitude
#### [1] 22.3221739419203
#### 
#### $longitude
#### [1] 114.141179433862

####  Answer from the online conversion tool
####  http://www.geodetic.gov.hk/smo/tform/tform.aspx
####  22.322172084 	114.141187917

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