Covert WGS84GEO geographical coordinates TO HK1980GRID coordinates

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Description

Covert WGS84GEO geographical coordinates TO HK1980GRID coordinates

Usage

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WGS84GEO_TO_HK1980GRID(latitude, longitude)

Arguments

latitude

latitude in decimal degrees

longitude

longitude in decimal degrees

Details

This function convert the latitude and longitude to HK80GEO coordinates first, and converts the later to HK1980GRID coordinates.

Value

N

Northern coordinate in meters

E

Eastern coordinate in meters

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

HK1980GRID_TO_WGS84GEO

Examples

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options(digits = 15)
HK1980GRID_TO_WGS84GEO(820351.389, 832591.320)
### $latitude
### [1] 22.3221739419203
### 
### $longitude
### [1] 114.141179433862

### Answer from the online conversion tool
### http://www.geodetic.gov.hk/smo/tform/tform.aspx
### 22.322172084
### 114.141187917

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