<div dir="auto"><div>Ah yes, I mean that projsync pulls <span style="font-family:sans-serif">us_noaa_g2018u0.</span><span style="font-family:sans-serif">tif but the readme refers to </span><span style="font-family:sans-serif">us_nga_g2018u0.tif</span><span style="font-family:sans-serif"><br></span><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jul 1, 2020, 6:36 PM John Helly <<a href="mailto:hellyj@ucsd.edu">hellyj@ucsd.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
Don't know about your overall problem but NGA is probably the
National Geospatial Agency and NOAA is National Oceanic and
Atmospheric Agency: i.e., not just a typo.<br>
<br>
J.<br>
<br>
<div>On 7/1/20 16:49, Patrick Young wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hello,
<div><br>
</div>
<div>I am trying to figure out how to convert some elevations I
have into heights above ellipsoid via the cs2cs tool. I am
using proj 7.0.1, and I've run projsync --all to snag all the
grids.</div>
<div><br>
</div>
<div>Here is an example of what isn't working for me:</div>
<div><br>
</div>
<div>echo 565890.947 4192011.754 55 | cs2cs +proj=utm +zone=10
+datum=NAD83 +units=m +no_defs +geoidgrids=us_noaa_g2018u0.tif
+to +proj=utm +zone=10 +datum=NAD83 +units=m +vunits=m
+no_defs<br>
565890.95 4192011.75 55.00<br>
</div>
<div><br>
</div>
<div>I am confused as to why the elevation value isn't changing
for me. My (extremely limited) understanding is that I am
asking for 55m to be converted from a height referenced
against the NADV88 geoid to one referenced against the NAD83
ellipsoid. Am I using the wrong geoid grid? From the grid
readme, it mentions "us_nga_g2018u0.tif : Conterminous US,
referenced to NAD83(2011). Vertical datum: NAVD88"
(presumably the nga <-> noaa is a typo in the readme) so
I think I'm using the right one.</div>
<div><br>
</div>
<div>Thanks for any help,</div>
<div>Patrick</div>
</div>
<br>
<fieldset></fieldset>
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</blockquote>
<br>
<pre cols="72">--
John Helly, University of California, San Diego / San Diego Supercomputer Center / Scripps Institution of Oceanography / 760 840 8660 mobile / <a href="http://www.sdsc.edu/~hellyj" target="_blank" rel="noreferrer">http://www.sdsc.edu/~hellyj</a>
ORCID ID: <a href="http://orcid.org/0000-0002-3779-0603" target="_blank" rel="noreferrer">orcid.org/0000-0002-3779-0603</a></pre>
</div>
</blockquote></div></div></div>