WGS84UTM_TO_WGS84GEO: Covert WGS84UTM coordinates to WGS84GEO coordinates

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

Description

Covert WGS84UTM coordinates to WGS84GEO coordinates

Usage

WGS84UTM_TO_WGS84GEO(N, E, zone = c(49, 50))

Arguments

N	Numerical, the northern coordinates, in meters.
E	Numerical, the eastern coordinates, in meters.
zone	UTM zone, should be either 49 or 50.

Details

Using Equation 3,4,5 and iterations to compute the values.

Value

latitude	latitude based on WGS84 datum. In decimal degrees
longitude	longitude based on WGS84 datum. 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_WGS84UTM

Examples

options(digits = 15)
WGS84UTM_TO_WGS84GEO(2483568, 209192, zone = 50)

### $latitude
### [1] 22.4336553287886
### 
### $longitude
### [1] 114.174807232072
### 

### The answer from the explanatory notes is 
### 22 + 26/60 + 1.16/3600 = 22.433655555555557015
### 114 + 10/60 + 29.24/3600 = 114.17478888888889799

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