Last active
August 29, 2015 14:22
-
-
Save debuggingfuture/b63fbdf5249e249c5165 to your computer and use it in GitHub Desktop.
Converting HK1980Grid (EPSG:2326) into WGS84
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| var proj4 = require('proj4'); | |
| //https://github.com/proj4js/proj4js | |
| //More on the systems | |
| //http://www.geodetic.gov.hk/data/pdf/explanatorynotes.pdf | |
| proj4.defs('WGS84', "+title=WGS 84 (long/lat) +proj=longlat +ellps=WGS84 +datum=WGS84 +units=degrees"); | |
| //HK co-ordinate system http://spatialreference.org/ref/epsg/hong-kong-1980-grid-system/ | |
| proj4.defs('EPSG2326','+proj=tmerc +lat_0=22.31213333333334 +lon_0=114.1785555555556 +k=1 +x_0=836694.05 +y_0=819069.8 +ellps=intl +towgs84=-162.619,-276.959,-161.764,0.067753,-2.24365,-1.15883,-1.09425 +units=m +no_defs'); | |
| //convert co-ordinates from HK 1980 to WGS84 | |
| var coordinatesWGS84 = proj4('EPSG2326','WGS84',[832699,836055]); | |
| console.log(coordinatesWGS84); | |
| //[ 114.14219797067243, 22.46398393930019 ] |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment