HK80UTM_TO_HK1980GRID: Convert HK80UTM coordinates to HK1980GRID coordinates
In helixcn/HK80: Conversion Tools for HK80 Geographical Coordinate System

Description Usage Arguments Details Value Note Author(s) References See Also Examples

View source: R/HK80UTM_TO_HK1980GRID.R

Convert HK80UTM coordinates to HK1980GRID coordinates

1	HK80UTM_TO_HK1980GRID(N, E, zone)

`N`	Numeric, Northern coordinate in meters
`E`	Numeric, Eastern coordinate in meters
`zone`	zone, UTM zone, either 49 or 50 for Hong Kong.

This function converts the coordinates to HK80GEO first, and convert the intermediate results into HK1980GRID coordinates.

`N`	Northern coordinate in meters
`E`	Eastern coordinate in meters

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

Jinlong Zhang

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

HK1980GRID_TO_HK80UTM

#### The similar conversion is not available at 
#### http://www.geodetic.gov.hk/smo/tform/tform.aspx
#### The accuracy is unknown
options(digits = 15)
HK80UTM_TO_HK1980GRID(N = 2471279, E = 205494, zone = 50)