[MetaCRS] Questions about difference of result depending on the version of Proj4js

[Clément Ronzon]

Hi,

A long time ago I was using the following version of Proj4js:
$Id: Proj.js 2956 2007-07-09 12:17:52Z steven $
Which, was returning 61.541418560123766°N, 24.054804906259587°E when
converting 3343570m, 6829498m from EPSG:2393 (see definition below) to
WGS84.
(follow this link:
http://twcc.free.fr/?l=en&sc=WGS84&dc=EPSG%253A2393&wgs84=24.054804906259587%252C61.541418560123766&z=2&mt=terrain
)

Today I'm running my app with version 2.3.4-alpha and it returns a WGS84 a
bit different for the same conversion:
61.5409642803359°N, 24.057490703013173°E
(follow this link:
http://twcc.fr/fr/?sc=WGS84&dc=EPSG%253A2393&wgs84=24.057490703013173%252C61.54096428033589&z=2&mt=terrain#donate
)

If someone could explain to me why we have such a difference (151 meters)
and/or which one of those two results should I trust in, I would be very
grateful.

BTW, Proj4js is a very amazing project/library and is so useful!

Here is the definition of EPSG:2393 I use for both calculations:
+title=KKJ Zone 3 +proj=tmerc +lat_0=0 +lon_0=27 +k=1 +x_0=3500000 +y_0=0
+ellps=intl
+towgs84=-96.0617,-82.4278,-121.7435,4.80107,0.34543,-1.37646,1.4964
+units=m +no_defs

Thank you.
Sincerely,
Clément Ronzon
Retorno Elias Nandino #50 <https://goo.gl/maps/z0Cq5>
Los Encinos 2 etapa 2
83293 Hermosillo, Sonora, MEXICO
Tel. # : 6621 96 18 66
génisse.foliot.éraillure
<http://twcc.fr/?sc=WGS84&dc=W3wConnector&wgs84=-110.9359610080719%252C29.05729043310689&z=19&mt=hybrid#donate>
<http://twcc.free.fr> <http://www.grottocenter.org/> <http://www.zakbag.com>
  <http://www.wikicaves.org/>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/metacrs/attachments/20150217/00dccff9/attachment.html>