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pj_get_suggested_operation(): tune for GDA94 <--> WGS84 and GDA2020 <…-> WGS84 #3621

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merged 1 commit into from
Feb 14, 2023

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rouault
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@rouault rouault commented Feb 12, 2023

Before this change, the au_icsm_GDA94_GDA2020_conformal_and_distortion.tif was considered as the best operation for GDA94 <--> WGS84 and GDA2020 <--> WGS84 from cs2cs / proj_crs_to_crs() point of view. This change makes the null transformation be the prefered one instead. Applying the GDA94 <--> GDA2020 grid was highly questionable GDA2020 <--> WGS84. Not completely sure for GDA94 <--> WGS84 though...

Relates to qgis/QGIS#51792

@nyalldawson Opinion greatly welcome

…--> WGS84

Before this change, the
au_icsm_GDA94_GDA2020_conformal_and_distortion.tif was considered as the
best operation for GDA94 <--> WGS84 and GDA2020 <--> WGS84. This change
makes the null transformation be the prefered one instead.
Applying the GDA94 <--> GDA2020 grid was highly questionable GDA2020 <--> WGS84.
Not completely sure for GDA94 <--> WGS84 though...

Relates to qgis/QGIS#51792
@nyalldawson
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I'll weigh in next week -- this is too tricky for a Sunday morning 🤣

@nyalldawson
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Yep, this looks correct by my understanding:

gda2020 <-> gda94 -- not null
gda2020 <-> wgs94 = null
gda94 <-> wgs94 = null

@rouault rouault added this to the 9.2.0 milestone Feb 14, 2023
@rouault rouault merged commit 59c9812 into OSGeo:master Feb 14, 2023
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2 participants