[PROJ] Needs a sanity check on Vertical Transformation

[Clifford J Mugnier]

GEOID12B has been superceded


Clifford J. Mugnier, c.p., c.m.s.

Chief of Geodesy

LSU Center for GeoInformatics (ERAD 266)

Dept. of Civil Engineering (P.F. Taylor 3531)

LOUISIANA STATE UNIVERSITY

Baton Rouge, LA  70803

Academic: (225) 578-8536

Research: (225) 578-4578

Cell:             (225) 328-8975

honorary lifetime member, lsps

fellow emeritus, asprs

member, apsg

________________________________
From: PROJ <proj-bounces at lists.osgeo.org> on behalf of YK_climate <julien.schroder at gmail.com>
Sent: Friday, November 1, 2019 3:12 PM
To: proj at lists.osgeo.org <proj at lists.osgeo.org>
Subject: [PROJ] Needs a sanity check on Vertical Transformation

Hello,
I have been trying to perform vertical transformation with Proj for a few
days now, I think I am done but I am in some help to be sure I didn't make
some stupid mistakes!
I am looking at getting coordinates in WGS84-Ellipsoid to WG84-EGM96,WG84-
EGM2008 and to NAD83(2011)GEOID12B.

Here is what I have working so far :
WGS84-EGM2008 : cs2cs EPSG:4979 EPSG:4326+3855
WGS84-EGM96    : cs2cs EPSG:4979 EPSG:4326+5773
Is this correct?

So naturally I thought that GEOID12B would be as easy :
NAD83(2011)-GEOID12B    : cs2cs EPSG:4979 EPSG:6319+5703 <= no vertical
change
NAD83(2011)-GEOID12B    : cs2cs EPSG:4979 EPSG:5498         <= no vertical
change

After reading about geoidgrids I tried this and it works but I need to be
sure I am using the right parameters
cs2cs EPSG:4979 "+proj=longlat +datum=NAD83 +geoidgrids=g2012bu0.gtx"

Thank you for your time!




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