1-New-Geometric-Datum

							    New Geometric Datum:
           plans

        Modernizing the U.S.
  National Spatial Reference System
FGCS
San Diego, California
Monday 11 July 2011     Joe.Evjen@noaa.gov
     Coordination begins with good coordinates



Geodetic control is the foundation
for all geospatial products.
                Geodetic Control is the
                critical “basemap” layer
                   for GIS applications
                         Source: Zurich-American Insurance Group
How accurate is the NSRS?




                Crustal velocities
           Passive networks are aging
              (instability, accessibility, loss)
         NAD83 vs GNSS


                                                       Earth’s
                                                      Surface




         ITRF
         Origin



NAD 83
                  ( Identically shaped ellipsoids )
Origin
New geometric datum minus NAD 83
          (horizontal)
New geometric datum minus NAD 83
        (ellipsoid height)
mm/year
      1.6 meter shift on a 1:25,000 map


                               NAD83 and GNSS
                             modern users abuse
                              lat/lon lattices are
                                   map scale
                                0.006 cm apart



                                                     Accurate and seamless!!




Optimized for my project!!
  the path to a new geospatial datum
• SCIENCE:
   – participate in international geodesy
   – maintain core geodetic infrastructure
   – define stable North America, plate motions, local issues


• OUTREACH:
   – illustrate limitations of current system
   – geospatial summits with FGCS, ACSM, ION, etc.
   – assist key stakeholders to identify use cases, issues


• TOOLS:
   – dependable models
   – GEOID, NADCON, H(+V) TDP exploitable via vendor toolkits
   – services for RTN operators
  the path to a new geospatial datum
• DEFINE:
   – Fixed to plate at what epoch? Update frequency/tolerance?
   – Coordination with international community, Canada, Mexico, etc.
   – FGDC vote to adopt, Federal Register Notice, formal report, & FAQ


• IMPLEMENT:
   – Products (datasheets, OPUS, GEOIDs, maps, charts, projects)
   – Toolkit (NADCON, TDP) and best practices
   – Legacy plan: how much support for USSD, NAD27, NAD83


• TIME FRAME:
   – Follow in synch with geopotential datum effort
   – Note, NAD27 is still in use.
       Geospatial summit 2012
• What do you want to talk about?
                     geodesy.noaa.gov/2010Summit/
                          •Presentations
                          •Handouts
                          •Proceedings