gcjtowgs_acc: GCJ02 to WGS84 Accurate

In versey-sherry/ChinaCoordinate: An R package for converting Chinese coordinates (GCJ02 and BD09 coordinates) to WGS84 coordinates and vice versa.

Description

Function to convert GCJ02 coordinates to WGS84 coordinates.

This function uses bisection method to find more accuate WGS84 coordinates. This function requires heavy computation and it is good for scenarios in which great accuracy, as good as less than a few meters error, is needed.

Geographic data from Baidu and coordinates in Baidu maps are BD09 coordinates. Geographic data from Chinese official websites and coordinates from Chinese map providers such as Gaode and QQ map are GCJ02 coordinates. GCJ02 coordinates is the first encryption applied to WGS84 coordinates. BD09 adds one more layer of encryption on top of GCJ02.

Usage

gcjtowgs_acc(coordinates)

Arguments

coordinates

A vector of coordinate pair c(lat, lon)

Value

lat, lon

Examples

#Coordinate data from official websites eg. c(39.8673, 116.366)
#Convert to WGS84 coordinates

gcjtowgs_acc(c(39.8673, 116.366))

versey-sherry/ChinaCoordinate documentation built on May 25, 2019, 9:25 a.m.