[PROJ] Proper projection system for Aruba

[Clifford J Mugnier]

Oops; bad memory-that was Sint Maartin.
CJM

Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: PROJ <proj-bounces at lists.osgeo.org> on behalf of Clifford J Mugnier <cjmce at lsu.edu>
Sent: Friday, February 7, 2020 9:04:59 AM
To: Jelmer Baas <Jelmer.Baas at speerit.nl>; proj at lists.osgeo.org <proj at lists.osgeo.org>
Subject: Re: [PROJ] Proper projection system for Aruba

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

Get Outlook for iOS<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Faka.ms%2Fo0ukef&data=02%7C01%7Ccjmce%40lsu.edu%7C00cab91fa7924c1a168208d7abdf1bfa%7C2d4dad3f50ae47d983a09ae2b1f466f8%7C0%7C0%7C637166847045444951&sdata=KB86J0YfHC6TGGSBS3sT7VsGZcC1YpExcGNiyZWuqAQ%3D&reserved=0>
________________________________
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


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/proj/attachments/20200207/fdf6dd06/attachment-0001.html>