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[Backport 6.2] Improve vertical transforms #1613

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merged 3 commits into from Sep 15, 2019

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rouault commented Sep 13, 2019

This is a backport of #1608 for things that concern vertical transformations, as current PROJ 6 behaviour is a bit a regression regarding past versions as can been seen in OSGeo/gdal#1836 (comment)

rouault added 3 commits Sep 11, 2019
…nd b < c --> a < c), to get consistent results
…eographic and vertical CRS

For example when transforming from NAD83+NAVD88 height to WGS84, there
is no transformation between NAVD88 height to WGS84. In that case,
use all potential transformations from NAVD88 height to another geographic CRS
for the vertical part.
…l component is a BoundCRS, do not apply the horizontal transformation twice
@rouault rouault added this to the 6.2.1 milestone Sep 13, 2019
@kbevers kbevers merged commit eb5906b into OSGeo:6.2 Sep 15, 2019
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