The '''NTv2''' ('''National Transformation version 2''') is a standard binary grid shift (.GSB) file format. It can transform coordinates between the NAD27 and NAD83 geodetic reference systems for example. The transformation is bidimensional (2D), or horizontal, and does not require heights.<ref>{{cite web|url=http://webapp.geod.nrcan.gc.ca/geod/tools-outils/ntv2.php|title=NTv2|website=Natural Resources Canada|accessdate=25 May 2018|archive-date=25 May 2018|archive-url=https://web.archive.org/web/20180525094357/http://webapp.geod.nrcan.gc.ca/geod/tools-outils/ntv2.php|url-status=live}}</ref><ref name=eye4software2018>{{cite web|url=https://www.eye4software.com/hydromagic/documentation/ntv2/|title=NTv2 National Transformation version 2|website=eye4software|accessdate=25 May 2018|archive-date=25 May 2018|archive-url=https://web.archive.org/web/20180525205037/https://www.eye4software.com/hydromagic/documentation/ntv2/|url-status=live}}</ref>
==Development and adaptation==
The National Transformation format has been developed by Natural Resources Canada's Geodetic Survey Division for conversions between NAD27 and NAD83 but it has been adapted to several other countries, such as Australia, Austria,<ref>{{Cite web|url=https://www.bev.gv.at/portal/page?_pageid=713,2157075&_dad=portal&_schema=PORTAL|title=GIS-Grid|access-date=2022-01-17|archive-date=2022-01-17|archive-url=https://web.archive.org/web/20220117110521/https://www.bev.gv.at/portal/page?_pageid=713,2157075&_dad=portal&_schema=PORTAL|url-status=dead}}</ref> Belgium,<ref>{{cite web|url=http://www.ngi.be/FR/FR2-1-7.shtm|title= Belgian Datum Lambert 2008/ETRS 89|website=NGI|accessdate=28 November 2018}}</ref> Brazil, Canada, France, Germany, New Zealand, Portugal, Romania,<ref>{{cite web|url=https://cngcft.ro/index.php/ro/download/download/2-software/9-instalare-ntv2|title=Instalare_NTv2 Stereo70-ETRS89|website=Centrul Naţional de Cartografie|accessdate=24 February 2022|archive-date=24 February 2022|archive-url=https://web.archive.org/web/20220224080246/https://cngcft.ro/index.php/ro/download/download/2-software/9-instalare-ntv2|url-status=live}}</ref> South Africa, Spain, Switzerland, Venezuela<ref name=eye4software2018/> and the United Kingdom.<ref>{{cite web|url=https://www.ordnancesurvey.co.uk/business-and-government/help-and-support/navigation-technology/os-net/ostn02-ntv2-format.html|title=OSTN02 – NTv2 format|website=Ordnance Survey|accessdate=25 May 2018|archive-date=25 May 2018|archive-url=https://web.archive.org/web/20180525205039/https://www.ordnancesurvey.co.uk/business-and-government/help-and-support/navigation-technology/os-net/ostn02-ntv2-format.html|url-status=live}}</ref><ref>{{cite web|last1=Civil Engineering Surveyor|title=High Speed 2: Developments in rail engineering survey grids|url=http://ces.pagelizard.co.uk/webviewer/#cesseptember2020/high_speed_2_developments_in_rail_engineering_survey_grids|website=CES|publisher=Chartered Institution of Civil Engineering Surveyors|accessdate=23 October 2020|date=2020-09-01|archive-date=2020-11-01|archive-url=https://web.archive.org/web/20201101082004/http://ces.pagelizard.co.uk/webviewer/#cesseptember2020/high_speed_2_developments_in_rail_engineering_survey_grids|url-status=live}}</ref>
==References==
{{reflist}}
Category:Geographic coordinate systems Category:Geodetic datums Category:Surveying Category:Surveying of Canada