[PROJ] Proper projection system for Aruba

[Clifford J Mugnier]

You might be in the old French System as I recall.  Check out my Grids & Datums from PE&RS, July 2002.
C. Mugnier

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________________________________
From: PROJ <proj-bounces at lists.osgeo.org> on behalf of Jelmer Baas <Jelmer.Baas at speerit.nl>
Sent: Friday, February 7, 2020 9:00:34 AM
To: proj at lists.osgeo.org <proj at lists.osgeo.org>
Subject: [PROJ] Proper projection system for Aruba


Hello,



I’m trying to convert coordinates from what seems to be a custom projection system in Aruba, without much luck.



In their drawings, they have data around 3000, 18000. Whatever existing projection system I use (EPSG 24819, EPSG 32619), I end up at a completely different location.



For example:

echo 2936 18088 | cs2cs +proj=utm +zone=19 +ellps=intl +towgs84=-216.408,279.243,-203.231,-8.56912,40.8756,-12.5593,15.8909 +units=m +to +proj=webmerc +datum=WGS84

-8178296.58     17850.76 22.52



echo 2936 18088 | cs2cs +proj=utm +ellps=intl +towgs84=-216.408,279.243,-203.231,-8.56912,40.8756,-12.5593,15.8909 +units=m +to +proj=webmerc +datum=WGS84

-830835.88      16729.91 101.08



This is way outside the expected area. In 3857, the data should be somewhere between

-7800000, 1417000

-7777000, 1393000



I do have the attached “.gtf” files, but I’m unsure how to apply this in proj. Is the above string correct? What am I missing?



Any help would be greatly appreciated.



Regards,

Jelmer Baas


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