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<p class="MsoNormal">Duncan wrote:</p>
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<p class="MsoNormal"><span lang="EN-GB">> As an onlooker, I have a question: what is UTM/WGS84 intended to mean?
</span>Is it (A) the UTM projection using the WGS84 ellipsoid<o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-GB">as a parameter, or (B) is it meant to imply also that the coordinates are in a datum that is one of the several labelled WGS84?
</span>A is clear and completely unambiguous; B isn't, partly because it is subject to change as data are collected (not to mention plate motions). Data-dependence is also a problem with geoid models: it is why there are so many, after all.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Duncan, I think WGS84-UTM is normally intended to mean both A and B so it is using a datum of WGS84 realisation and the WGS84 ellipsoid. According to ISO and EPSG de ellipsoid is part of the datum, so in that case the
answer A and B is the same as just B. <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">Jochem <o:p></o:p></span></p>
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