[PROJ] WGS84/NAD83 Original to {current} transforms

[Matt.Wilkie at gov.yk.ca]

Hi Nicolas,

> You probably found this but I am posting anyways in case you did not
> http://www.naref.org/transf/nad83_hydroscan2006.pdf
> https://webapp.geod.nrcan.gc.ca/geod/tools-outils/ntv2.php?locale=en
> https://www.nrcan.gc.ca/maps-tools-and-publications/tools/geodetic-reference-systems-tools/tools-applications/10925#Epochs
> Look for Trx and NTv2 tools.

Yes I found those. It’s good that you posted them so now the list has a record for whomever chances on this thread next. It was Mike Craymer’s 2006 hydro scan presentation in particular that convinced me it’s necessary to account for the shift even up here north of 60.

NRCAN’s TRX tool will let me transform coordinates from one CSRS epoch to another but not from Original to CSRS. (It’s also only designed for point CSV-style records and can’t be used (efficiently) for bulk lines, polygons, etc.) I’m not familiar with the tool so there could be a way to use TRX and/or it’s data files/algorithms in a way that isn’t exposed in the GUI. Or I’m just using it wrong!

NTv2 tools can only operate with grid shift files, and since there are none here can’t do anything.

I have contacted Geodetic Survey of Canada and asked for advice; no word back yet.

Thanks for your help,

Matt
Geomatics Analyst | Environment | T 867-667-8133 | Yukon.ca

From: Nicolas Cadieux <nicolas.cadieux at archeotec.ca>
Sent: November 23, 2019 7:40 AM
To: Matt.Wilkie <Matt.Wilkie at gov.yk.ca>
Cc: proj at lists.osgeo.org
Subject: Re: [PROJ] WGS84/NAD83 Original to {current} transforms



Hi,
You probably found this but I am posting anyways in case you did not

http://www.naref.org/transf/nad83_hydroscan2006.pdf<https://imsva91-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=http%3a%2f%2fwww.naref.org%2ftransf%2fnad83%5fhydroscan2006.pdf&umid=F647DBDA-9805-5805-B5E8-D43BFBE0BEFB&auth=c132af8ee7c9d1278d61a701569070a095ce962e-2d7bd192d2f6e453799af10038f86f69fe2fa332>

https://webapp.geod.nrcan.gc.ca/geod/tools-outils/ntv2.php?locale=en

https://www.nrcan.gc.ca/maps-tools-and-publications/tools/geodetic-reference-systems-tools/tools-applications/10925#Epochs

Look for Trx and NTv2 tools.

Nicolas
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/proj/attachments/20191125/51e655af/attachment.html>