add gda2020 proj4 string

Author: nf-s

lib/controllers/proj4lookup.js

@@ -8,6 +8,8 @@ var proj4 = require('proj4');
 //TODO: check if this loads the file into each core and if so then,
 require('proj4js-defs/epsg')(proj4);
 
+// GDA2020 proj4 string from https://gis.stackexchange.com/questions/349780/is-there-a-proj4-string-for-gda2020-epsg7844-that-we-use-to-transform-from-38
+proj4.defs["EPSG:7844"] = "+proj=longlat +ellps=GRS80 +towgs84=-0.06155,0.01087,0.04019,-0.0394924,-0.0327221,-0.03289790,0.009994 +no_defs";
 
 //provide REST service for proj4 definition strings
 router.get('/:crs', function(req, res, next) {
@@ -19,4 +21,4 @@ router.get('/:crs', function(req, res, next) {
     }
 });
 
-module.exports = router;
+module.exports = router;