<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
span.EmailStyle20
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="NL" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal">Hi Jochem,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Thank you for the information. I’ll dig through their documentation and contact them.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Here’s to hoping I can provide the proj string, later on.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:NL">Regards,<br>
</span><b><span lang="EN-US" style="font-size:10.0pt;line-height:106%;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:NL">Jelmer Baas<o:p></o:p></span></b></p>
</div>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:NL">From:</span></b><span lang="EN-US" style="mso-fareast-language:NL"> Lesparre, Jochem <Jochem.Lesparre@kadaster.nl>
<br>
<b>Sent:</b> vrijdag 7 februari 2020 17:31<br>
<b>To:</b> Jelmer Baas <Jelmer.Baas@speerit.nl>; proj@lists.osgeo.org<br>
<b>Subject:</b> RE: Proper projection system for Aruba<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Hi Jelmer,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Aruba’s CRS is a local TM projection with its central meridian through the Hooiberg. Unfortunately it is not in the EPSG registry.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">An approximate transformation is available in the PCTrans software by the Dutch Hydrographic Service:<o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://english.defensie.nl/topics/hydrography/documents/applications/2018/06/06/pctrans5_20180601"><span lang="EN-GB">https://english.defensie.nl/topics/hydrography/documents/applications/2018/06/06/pctrans5_20180601</span></a><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">If you want to use PROJ, the transformation parameters of PCTrans can probably be found in de documentation of the software or obtained by sending a message to NSGI:<o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://www.nsgi.nl/over-ons/nsgi/contact"><span lang="EN-GB">https://www.nsgi.nl/over-ons/nsgi/contact</span></a><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Precise (sub metre) transformation parameters are available at the local authorities DLV, and more precise (centimetre) transformation parameters should be computed for DLV this year. However, I’m not sure if they share
these. Contact information can be found here:<o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://www.overheid.aw/home-ned/departementen_46763/item/dienst-landmeetkunde-en-vastgoedregistratie-dlv_4615.html"><span lang="EN-GB">https://www.overheid.aw/home-ned/departementen_46763/item/dienst-landmeetkunde-en-vastgoedregistratie-dlv_4615.html</span></a><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">If this contact information is outdated, you can contact NSGI (see above) to ask to get you in touch with DLV.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Kind regards, Jochem<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:NL">From:</span></b><span lang="EN-US" style="mso-fareast-language:NL"> PROJ <<a href="mailto:proj-bounces@lists.osgeo.org">proj-bounces@lists.osgeo.org</a>>
<b>On Behalf Of </b>Jelmer Baas<br>
<b>Sent:</b> vrijdag 7 februari 2020 16:01<br>
<b>To:</b> <a href="mailto:proj@lists.osgeo.org">proj@lists.osgeo.org</a><br>
<b>Subject:</b> [PROJ] Proper projection system for Aruba<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’m trying to convert coordinates from what seems to be a custom projection system in Aruba, without much luck.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">For example:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">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<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">-8178296.58 17850.76 22.52<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">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<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">-830835.88 16729.91 101.08<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">This is way outside the expected area. In 3857, the data should be somewhere between<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">-7800000, 1417000<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">-7777000, 1393000<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">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?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Any help would be greatly appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Jelmer Baas<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:NL"><br>
<br>
</span><span style="font-size:10.0pt;mso-fareast-language:NL">Disclaimer:<br>
De inhoud van dit bericht is uitsluitend bestemd voor geadresseerde.<br>
Gebruik van de inhoud van dit bericht door anderen zonder toestemming van het Kadaster<br>
is onrechtmatig. Mocht dit bericht ten onrechte bij u terecht komen, dan verzoeken wij u<br>
dit direct te melden aan de verzender en het bericht te vernietigen.<br>
Aan de inhoud van dit bericht kunnen geen rechten worden ontleend.<br>
<br>
Disclaimer:<br>
The content of this message is meant to be received by the addressee only.<br>
Use of the content of this message by anyone other than the addressee without the consent<br>
of the Kadaster is unlawful. If you have received this message, but are not the addressee,<br>
please contact the sender immediately and destroy the message.<br>
No rights can be derived from the content of this message.</span><span style="mso-fareast-language:NL"><o:p></o:p></span></p>
</div>
</body>
</html>