#' Conversion Tools for HK80 Geographical Coordinate System
#'
#' Conversion and Reverse Conversion between HK80 Geographical Coordinate
#' System and WGS84 based Geographical Coordinate Systems.
#'
#' \tabular{ll}{ Package: \tab HK80\cr Type: \tab Package\cr Version: \tab
#' 0.0.2\cr Date: \tab 2016-07-26\cr License: \tab GPL-2\cr } This package
#' provides functions for converting the coordinates between WGS84UTM,
#' WGS84GEO, HK80UTM, HK80GEO and HK1980GRID Coordinate Systems used in Hong
#' Kong SAR, based on the algorithms described in Explanatory Notes on Geodetic
#' Datums in Hong Kong by Survey and Mapping Office Lands Department, Hong Kong
#' Government (1995).
#'
#' @name HK80-package
#' @aliases HK80-package HK80
#' @docType package
#' @author
#'
#' Jinlong Zhang
#'
#' Maintainer: Jinlong Zhang <jinlongzhang01@@gmail.com>
#' @references Survey and Mapping Office Lands Department, Hong Kong Government
#' (1995). Explanatory Notes on Geodetic Datums in Hong Kong, available at:
#' \url{http://www.geodetic.gov.hk/smo/gsi/data/pdf/explanatorynotes.pdf}
#' @keywords package
#' @examples
#'
#' ### Conversion between HK1980GRID and WGS84UTM
#' options(digits = 15)
#' HK1980GRID_TO_WGS84UTM(820351.389, 832591.320)
#'
#' #### $N
#' #### [1] 2471278.72371238
#' ####
#' #### $E
#' #### [1] 205493.220852789
#' ####
#' #### $zone
#' #### [1] 50
#'
#' #### Answer from the online conversion tool
#' #### at: http://www.geodetic.gov.hk/smo/tform/tform.aspx
#' #### 2471279, 205494
#'
#'
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