1
Vote

WGS_84UTM to WGS_84 is inaccurate

description

In converting WGS84_UTM Zone 18N to WGS_84 I am supplying the following input:

307821.867 4219306.387

It is coming out of the transform as: -77.191748384445773 38.100463291796331

However both spatialite and http://home.hiwaay.net/~taylorc/toolbox/geography/geoutm.html give this as the result: -77.19176883027627 38.101147434053615

Spatialite:
spatialite> select astext(st_transform(MakePoint(307821.867, 4219306.387, 32618), 4326));
POINT(-77.191769 38.101147)

The conversion is off by many meters rendering the result unusable.

comments