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Okay, so basically encoding the zone in the easting? Better, but I still think it is weird. At least it produces somewhat sane output.
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<div class="">Is that operation used by any CRS in the EPSG database?</div>
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<div class="">/Kristian<br class="">
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<div class="">On 29 Oct 2018, at 21:03, Martin Desruisseaux <<a href="mailto:martin.desruisseaux@geomatys.com" class="">martin.desruisseaux@geomatys.com</a>> wrote:</div>
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<div class="">On 29 Oct 2018, at 20:20, Robb Main <<a href="mailto:rmain.mws@gmail.com" class="" moz-do-not-send="true">rmain.mws@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">(…snip…) I'd consider the UTM zone a part of the OUTPUT, whereas you seem to consider it part of the required input (lat, long & UTM zone).
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<div class="">So in my case:</div>
<div class=""> in: lat & long</div>
<div class="">out: UTM zone, easting & northing.</div>
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<div class="">so the process would look more like:</div>
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<div class="">$ echo 6 51 | proj +proj=utm +zone=auto</div>
<div class="">31 710488.86 5654109.18</div>
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<p class="">Actually such operation already exists in EPSG database (not sure if it exists in Proj4 however). This is the Operation Method EPSG::9824 - Transverse Mercator Zoned Grid System. The output is basically:</p>
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<p class="">E = Z*10^6 + (result of projection for zone Z)</p>
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<p class="">This is not widely used however.</p>
<p class=""> Martin</p>
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