<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<div class="moz-cite-prefix">Thanks, this is NOT the standard Web
Mercator projection. I am aware of EPSG:90013 and EPSG:3857. This
projection is used with HYCOM data that I have extracted into
geotif files so that I can accurately project that onto EPSG:3857.
It took some fiddling with the values to get to overlay visually
correctly. HYCOM data is weird in that it uses two different
projections based on if the data is above or below some latitude.<br>
<br>
On 4/13/2024 4:19 AM, Javier Jimenez Shaw via gdal-dev wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CADRrdKtReQ_1eKnF-k8w_wm_+XDpWb2Vux4=F13Q3xizCKjRmw@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div>If what you need is really EPSG:3857, yes, use it.</div>
<div><br>
</div>
<div>However I have seen strange parameters on your projection.
The radius of the sphere is the "average" 3671 km, and you set
a false easting and northing of just 4.4 km. Is that trying to
correct the radius of the sphere? I do not know why you need
that.</div>
<div><br>
</div>
<div>Bas, are they really equivalent?<br>
</div>
<div><br>
</div>
<div>In proj you can convert to WKT1 (see that I added
+type=crs):</div>
<div><br>
</div>
<div><span style="font-family:monospace">projinfo "+proj=merc
+a=6371001 +b=6371001 +lat_ts=0.0 +lon_0=0.0 +x_0=-4448
+y_0=-4448 +k=1.0 +units=m +over +nadgrids=@null +no_defs
+type=crs" -o wkt1_gdal</span></div>
<div><br>
</div>
</div>
</blockquote>
Ok I get this adding by <span style="font-family:monospace">+type=crs
but how do I add it to the proj database so I can access it
referencing it by something like EPSG:90014?<br>
<br>
Thanks,<br>
-Steve<br>
</span>
<blockquote type="cite"
cite="mid:CADRrdKtReQ_1eKnF-k8w_wm_+XDpWb2Vux4=F13Q3xizCKjRmw@mail.gmail.com"><br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, 13 Apr 2024 at 06:17,
Sebastiaan Couwenberg via gdal-dev <<a
href="mailto:gdal-dev@lists.osgeo.org"
moz-do-not-send="true" class="moz-txt-link-freetext">gdal-dev@lists.osgeo.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On
4/12/24 11:24 PM, Stephen Woodbridge via gdal-dev wrote:<br>
> and was able to access it in gdal, mapserver, postgis,
etc with <br>
> "EPSG:900914"<br>
<br>
I used to do that too, but switched to EPSG:3857 its
non-deprecated <br>
equivalent. I would recommend that instead of trying to keep
using a <br>
non-standard projection.<br>
<br>
Kind Regards,<br>
<br>
Bas<br>
<br>
-- <br>
GPG Key ID: 4096R/6750F10AE88D4AF1<br>
Fingerprint: 8182 DE41 7056 408D 6146 50D1 6750 F10A E88D
4AF1<br>
<br>
_______________________________________________<br>
gdal-dev mailing list<br>
<a href="mailto:gdal-dev@lists.osgeo.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">gdal-dev@lists.osgeo.org</a><br>
<a href="https://lists.osgeo.org/mailman/listinfo/gdal-dev"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a><br>
</blockquote>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
gdal-dev mailing list
<a class="moz-txt-link-abbreviated" href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a>
<a class="moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/gdal-dev">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a>
</pre>
</blockquote>
<br>
<div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br /><table style="border-top: 1px solid #D3D4DE;"><tr><td style="width: 55px; padding-top: 13px;"><a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient" target="_blank"><img src="https://s-install.avcdn.net/ipm/preview/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif" alt="" width="46" height="29" style="width: 46px; height: 29px;"/></a></td><td style="width: 470px; padding-top: 12px; color: #41424e; font-size: 13px; font-family: Arial, Helvetica, sans-serif; line-height: 18px;">Virus-free.<a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient" target="_blank" style="color: #4453ea;">www.avast.com</a></td></tr></table><a href="#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"> </a></div></body>
</html>