<p>Oh, I had not heard of the <a href="https://wiki.openstreetmap.org/wiki/Planet.gpx">GPX planet files</a> before. Yes, from a quick look, <code>ele</code> is in there. So that's certainly a good source for my use case, although there are some things it doesn't "intrinsically" do such as custom bbox limits.</p>
<p>I'm happy for this PR to be closed if wanted, but I'll not close it myself, in case anyone wants to consider it.</p>
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