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Legislative Issues for the New Datums of 2022

Legislative Issues for the New Datums of 2022. NGS Geospatial Summit Arlington, VA April, 2015. Dave Doyle NGS, Chief Geodetic Surveyor (Retired) base9geodesy@gmail.com. Federal and State Regulations. FEDERAL

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Legislative Issues for the New Datums of 2022

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  1. Legislative Issues for the New Datums of 2022 NGS Geospatial Summit Arlington, VA April, 2015 Dave Doyle NGS, Chief Geodetic Surveyor (Retired)base9geodesy@gmail.com

  2. Federal and State Regulations FEDERAL Federal Geodetic Control Committee (FGCS) drafts and publishes a notice in the Federal Registry – NGS has the chair of FGCS STATE Legislation published as part of state legal code Support may vary from state-to-state typically Land Surveyors Professional Society in collaboration with DoT. Now this may include state GIS organization(s)

  3. GEODETIC DATUMS FEDERAL REGISTER NOTICES • NAD 83 – June 14, 1989 • NAVD 88 – June 24, 1993 • ASVD 02 – Jan 22, 2009 • GUVD 04 – Jan 22, 2009 • NMVD 03 – Jan, 22, 2009 • VIVD 09 – Dec 12, 2011 • PRVD 02 – July 23, 2012

  4. STATE PLANE COORDINATE SYSTEMNAD 27 • Developed from a request in 1933 from the North Carolina State Highway and Public Works Commission -- (George F. Syme) • Zones designed by U.S. Coast and Geodetic Survey (Oscar S. Adams) • Two basic map projections used: • Lambert Conformal Conic – States or parts of states that have a more east-west orientation • Transverse Mercator – States or parts of states that have a more north-south orientation • Zone boundaries along International, state and county boundaries • Zones typically 158 miles wide – this limits the maximum geodetic to grid distance distortion to 1:10,000 • All coordinate values in U.S. Survey Feet • Conversions to/from latitude & longitude calculated using tables

  5. STATE PLANE COORDINATE SYSTEMNAD 83 • Geometric parameters of original SPC zones left unchanged unless requested by “the State” Most states changed no zone parameters California dropped zone 7 Maryland moved the latitude of the origin south 10’ Montana moved from 4 zones to a single zone New Jersey moved the Central Meridian 10’ east (aligned with NY E) South Carolina moved from 2 zones to a single zone • All states got new false northing and easting values defined in meters. • NGS publishes all values in meters, conversions to feet defined by individual state legislation or notice in the Federal Register: • 1 m = 3.2808333333 U.S. Survey Feet • 1 m = 3.2808398950 International Feet

  6. STATE LEGISLATION Codes of Virginia and Tennessee VA -- Title 55, Property and Conveyances, Chapter 17, 55-287 to 55-297 TN – Title 66, Property, Chapter 6, 101 to 106 • The systems of plane coordinates which have been established by the National Ocean Survey/National Geodetic Survey or its successors for defining and stating the positions or locations of points on the surface of the earth within the Commonwealth of Virginia are hereafter to be known and designated as the "Virginia Coordinate System of 1927" and the "Virginia Coordinate System of 1983." • The position of the Virginia Coordinate systems shall be as marked on the ground by triangulation or traverse stations established in conformity with the standards of accuracy and specifications for first-order and second-order geodetic surveying as prepared and published by the Federal Geodetic Control Committee (FGCC) of the United States Department of Commerce. • No coordinates based on either Tennessee coordinate system, purporting to define the position of a point on a land boundary, shall be presented to be recorded in any public land records or deed records unless such point is within five kilometers (5 km) of a horizontal control monument

  7. RECOMENDATIONS • Horizontal/Geometric and Vertical/Geopotential datums should be defined in the same FRN/State Legislation • Remove references to old proportional part orders of accuracy • Remove references to triangulation/traverse control points • Remove references to limits on distance to control points • NSPS Collaborate with NGS to develop model legislation

  8. FRNs and State Legislation • Should include requirements for metadata • DATUM and REALIZATION • Include datum designation, iteration and epoch e.g. NAD 83 (2011) Epoch 2010.0 NAVD 88 Epoch 2009.55 UNITS Meters U.S. Survey Feet International Feet ACCURACY • .01 m, .05 ft, 4 ft

  9. GOOD COORDINATION BEGINS WITH GOOD COORDINATES GEOGRAPHY WITHOUT GEODESY IS A FELONY

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