WGS84UTM_TO_WGS84GEO: Covert WGS84UTM coordinates to WGS84GEO coordinates In HK80: Conversion Tools for HK80 Geographical Coordinate System

Description

Covert WGS84UTM coordinates to WGS84GEO coordinates

Usage

 `1` ```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.

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

`WGS84GEO_TO_WGS84UTM`
 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13``` ```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 ```