Country masks are incorrect when combining tile-based countries with point-based occurrences

[MattBlissett]

See report from the mailing list: https://lists.gbif.org/pipermail/api-users/2019-January/000583.html

And a live demo: https://labs.gbif.org/~mblissett/2019/01/nl-1967873.html

Points on the clipped map disappear with increasing zoom level. My suspicion is this is due to the different processing used to generate the Netherlands map (large ⇒ pregenerated tile map) and the magpie moth map (small ⇒ all points map) meaning the clip mask doesn't quite align.

[MattBlissett]

Another example from the mailing list: https://lists.gbif.org/pipermail/api-users/2020-March/000625.html

With another demo: https://labs.gbif.org/~mblissett/2020/03/country-mask-issue.html