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

[Richard Greenwood]

Running cs2cs at the command line I get:
echo 3343570 6829498 | cs2cs -f '%2f' +init=epsg:2393 +to +init=epsg:4326
24.054805    61.541419 25.243873
So the new version looks to be in error. Maybe it's not applying the datum
transformation?

Rich




On Tue, Feb 17, 2015 at 2:04 PM, Clément Ronzon <clem.rz at gmail.com> wrote:

> 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
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-- 
Richard W. Greenwood, PLS
www.greenwoodmap.com
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