HK80UTM_TO_HK80GEO {HK80} | R Documentation |
Convert the HK80UTM coordinates to HK80GEO coordinates
Description
Convert the HK80UTM coordinates to HK80GEO coordinates
Usage
HK80UTM_TO_HK80GEO(N, E, zone = c(49, 50))
Arguments
N |
Numeric, Northern coordinate in meters. |
E |
Numeric, Eastern coordinate in meters. |
zone |
zone, UTM zone, either 49 or 50 for Hong Kong. |
Details
This function uses equation 3, 4, 5 in the explanatory notes to convert the HK80UTM coordinates into HK80GEO coordinates (latitude and longitude) in decimal degrees. Mode details could be found at: Page C9 and C10 on the explanatory notes.
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
Examples
options(digits = 15)
HK80UTM_TO_HK80GEO(2483775, 208930, zone = 50)
#### $latitude
#### [1] 22.435188997523
####
#### $longitude
#### [1] 114.172349350774
##### Answer from the explanatory note:
### 22 + 26/60 + 06.89/3600 = 22.43524722
### 114 + 10/60 + 20.39/3600 = 114.1723306