Covert WGS84UTM coordinates to WGS84GEO coordinates

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

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

Author

Jinlong Zhang

Note

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

Examples


options(digits = 15)
WGS84UTM_TO_WGS84GEO(2483568, 209192, zone = 50)
#>           latitude        longitude
#> 1 22.4336553287886 114.174807232072

### $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