<div dir="ltr"><div>Elmir,</div><div><br></div><div>Before considering a PR, please make sure that the OSGM15 material is freely distributable</div><div><br></div><div>/Thomas<br></div></div><br><div class="gmail_quote"><div dir="ltr">Den man. 3. sep. 2018 kl. 12.18 skrev Elmir Jagudin <<a href="mailto:elmir.jagudin@gmail.com">elmir.jagudin@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><br><br><div class="gmail_quote"><div dir="ltr">On Thu, Aug 23, 2018 at 10:41 AM Elmir Jagudin <<a href="mailto:elmir.jagudin@gmail.com" target="_blank">elmir.jagudin@gmail.com</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"><div dir="ltr"><br><div class="gmail_quote"><div dir="ltr">On Wed, Aug 22, 2018 at 12:12 PM Alain Orsoni <<a href="mailto:Alain.Orsoni@ign.fr" target="_blank">Alain.Orsoni@ign.fr</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">
<div>
<div>Hi,</div>
<div><br>
</div>
<div>Trying to answer with my knowledge :</div>
<div>On my computer I can do this transform in this way</div>
<div><br>
</div>
<div>
<div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">
<span style="font-variant-ligatures:no-common-ligatures">echo -6.6 53 21 | cs2cs +init=epsg:4326 +to +proj=tmerc +lat_0=53.5 +lon_0=-8 +k=0.99982 +x_0=600000 +y_0=750000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +geoidgrids=egm08_25_rg.gtx +units=m +no_defs</span></div>
<div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">
<span style="font-variant-ligatures:no-common-ligatures">693972.63<span class="m_-2317647223661451979gmail-m_-1029591613981137267gmail-m_-5031490941191905987Apple-tab-span" style="white-space:pre-wrap">
</span>695281.52 -35.37</span></div>
</div>
<div><br>
</div>
<div>The result is a little bit different from what you expect. Maybe because I use egm08 and you expect another Geoid model.</div></div></blockquote><br></div><div class="gmail_quote">Aha, cool. This looks like the right path for me.<br><br>Yes, the OSGM15 is probably using slightly different geoid model. I'll try to create gtx file for OSGM15.</div></div></blockquote><div><br></div><div>After creating a GTX table for OSGM15, the height calculations look correct. Thanks for help Alain and Even!</div><div><br></div><div>Is it possible to contribute these GTX files, so they are included into future proj4 releases?<br>Should I make a PR to this repo: <a href="https://github.com/OSGeo/proj-datumgrid" target="_blank">https://github.com/OSGeo/proj-datumgrid</a> ?<br><br>The tables are here for now:<br><a href="https://github.com/elmirjagudin/gri2gtx" target="_blank">https://github.com/elmirjagudin/gri2gtx</a><br></div><div><br></div><div>Best Regards,</div><div>Elmir</div></div></div></div></div></div></div>
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