What realization is datum "NAD83(NEVADA HPGH)-NADCON" referring to?

bjornnormanbjornnorman Global Mapper UserPosts: 2
I have survey data in Nevada state plane west NAD83/94.  I need to translate this to NAD83(2011) but cannot find any relalization referencing NAD83/94. Is "NAD83(NEVADA HPGH)-NADCON" referring to the 1994 realization or some other realization?  

Answers

  • MykleMykle Global Mapper User Posts: 435Trusted User
    Here are some definitions.  You get to sort out what you need, or not.  You probably want to use FEET (state def), so take care not to use one that uses METERS (federal def).  Note that in Global Mapper you can specify a datum by EPSG number.  

    Looking at the SpatialReference site and searching for "Nevada" produces a list of definitions, many of which are listed in this summary.  Using these definitions, more info is available at the GeoRepository site, and I have included the text info for the "Nevada West" definitions, along with the link to each definition.  
    http://www.spatialreference.org/ref/?search=Nevada

        EPSG:2820: NAD83(HARN) / Nevada East
        EPSG:2821: NAD83(HARN) / Nevada Central
        EPSG:2822: NAD83(HARN) / Nevada West
    NAD83(HARN) / Nevada West is a projected CRS last revised on 04/20/2007 and is suitable for use in United States (USA) - Nevada - counties of Churchill; Douglas; Esmeralda; Humboldt; Lyon; Mineral; Pershing; Storey; Washoe. NAD83(HARN) / Nevada West uses the NAD83(HARN) geographic 2D CRS as its base CRS and the SPCS83 Nevada West zone (meters) (Transverse Mercator) as its projection. NAD83(HARN) / Nevada West is a CRS for Large and medium scale topographic mapping and engineering survey. It was defined by information from National Geodetic Survey. State law defines system in US survey feet. See code 3431 for equivalent non-metric definition. Replaces NAD83 / SPCS for applications with an accuracy of better than 1m. Replaced by NAD83(NSRS2007) / SPCS.    
    http://georepository.com/crs_2822/NAD83-HARN-Nevada-West.html

        EPSG:3421: NAD83 / Nevada East (ft US)
        EPSG:3422: NAD83 / Nevada Central (ft US)
        EPSG:3423: NAD83 / Nevada West (ft US)
    NAD83 / Nevada West (ft US) is a projected CRS last revised on 12/20/2006 and is suitable for use in United States (USA) - Nevada - counties of Churchill; Douglas; Esmeralda; Humboldt; Lyon; Mineral; Pershing; Storey; Washoe. NAD83 / Nevada West (ft US) uses the NAD83 geographic 2D CRS as its base CRS and the SPCS83 Nevada West zone (US Survey feet) (Transverse Mercator) as its projection. NAD83 / Nevada West (ft US) is a CRS for Large and medium scale topographic mapping and engineering survey. It was defined by information from National Geodetic Survey. State law defines system in US survey feet. Federal definition is metric - see code 32109. For applications with an accuracy of better than 3 feet, replaced by NAD83(HARN) / SPCS.    
    http://georepository.com/crs_3423/NAD83-Nevada-West-ft-US.html
        
        EPSG:3429: NAD83(HARN) / Nevada East (ft US)
        EPSG:3430: NAD83(HARN) / Nevada Central (ft US)
        EPSG:3431: NAD83(HARN) / Nevada West (ft US)
    NAD83(HARN) / Nevada West (ft US) is a projected CRS last revised on 04/20/2007 and is suitable for use in United States (USA) - Nevada - counties of Churchill; Douglas; Esmeralda; Humboldt; Lyon; Mineral; Pershing; Storey; Washoe. NAD83(HARN) / Nevada West (ft US) uses the NAD83(HARN) geographic 2D CRS as its base CRS and the SPCS83 Nevada West zone (US Survey feet) (Transverse Mercator) as its projection. NAD83(HARN) / Nevada West (ft US) is a CRS for Large and medium scale topographic mapping and engineering survey. It was defined by information from National Geodetic Survey. State law defines system in US survey feet. Federal definition is metric - see code 2822. Replaces NAD83 / SPCS for applications with an accuracy of better than 3 feet. Replaced by NAD83(NSRS2007) / SPCS.
    http://georepository.com/crs_3431/NAD83-HARN-Nevada-West-ft-US.html

        EPSG:3607: NAD83(NSRS2007) / Nevada Central
        EPSG:3608: NAD83(NSRS2007) / Nevada Central (ft US)
        EPSG:3609: NAD83(NSRS2007) / Nevada East
        EPSG:3610: NAD83(NSRS2007) / Nevada East (ft US)
        EPSG:3611: NAD83(NSRS2007) / Nevada West
    NAD83(NSRS2007) / Nevada West is a projected CRS last revised on 03/13/2007 and is suitable for use in United States (USA) - Nevada - counties of Churchill; Douglas; Esmeralda; Humboldt; Lyon; Mineral; Pershing; Storey; Washoe. NAD83(NSRS2007) / Nevada West uses the NAD83(NSRS2007) geographic 2D CRS as its base CRS and the SPCS83 Nevada West zone (meters) (Transverse Mercator) as its projection. NAD83(NSRS2007) / Nevada West is a CRS for Large and medium scale topographic mapping and engineering survey. It was defined by information from U.S. National Geodetic Survey, http://www.ngs.noaa.gov/. State law defines use of US survey feet. See code 3612 for equivalent non-metric definition. Replaces NAD83(HARN) / SPCS.    
    http://georepository.com/crs_3611/NAD83-NSRS2007-Nevada-West.html
        
        EPSG:3612: NAD83(NSRS2007) / Nevada West (ft US)
    NAD83(NSRS2007) / Nevada West (ft US) is a projected CRS last revised on 03/13/2007 and is suitable for use in United States (USA) - Nevada - counties of Churchill; Douglas; Esmeralda; Humboldt; Lyon; Mineral; Pershing; Storey; Washoe. NAD83(NSRS2007) / Nevada West (ft US) uses the NAD83(NSRS2007) geographic 2D CRS as its base CRS and the SPCS83 Nevada West zone (US Survey feet) (Transverse Mercator) as its projection. NAD83(NSRS2007) / Nevada West (ft US) is a CRS for Large and medium scale topographic mapping and engineering survey. It was defined by information from U.S. National Geodetic Survey, http://www.ngs.noaa.gov/. State law defines use of US survey feet. Federal definition is metric - see code 3611. Replaces NAD83(HARN) / SPCS.    
    http://georepository.com/crs_3612/NAD83-NSRS2007-Nevada-West-ft-US.html  ;  
        
        EPSG:32107: NAD83 / Nevada East
        EPSG:32108: NAD83 / Nevada Central
        EPSG:32109: NAD83 / Nevada West
    NAD83 / Nevada West is a projected CRS last revised on 12/20/2006 and is suitable for use in United States (USA) - Nevada - counties of Churchill; Douglas; Esmeralda; Humboldt; Lyon; Mineral; Pershing; Storey; Washoe. NAD83 / Nevada West uses the NAD83 geographic 2D CRS as its base CRS and the SPCS83 Nevada West zone (meters) (Transverse Mercator) as its projection. NAD83 / Nevada West is a CRS for Large and medium scale topographic mapping and engineering survey. It was defined by information from National Geodetic Survey. State law defines system in US survey feet. See code 3423 for equivalent non-metric definition. For applications with an accuracy of better than 1m, replaced by NAD83(HARN) / SPCS.    
    http://georepository.com/crs_32109/NAD83-Nevada-West.html


  • samknightsamknight BMG Staff Posts: 87
    Hello Bjornnorman, that's quite right, the HPGN grids for Nevada reference the 1994 adjustment.  Here's a link for a little more reading, it's a bit historical at this point as Dave Doyle has since retired from NGS: http://www.ngs.noaa.gov/PUBS_LIB/Nevada_harn.html
    Regards,
    Sam Knight
    Director of Product Management
    Blue Marble Geogrpahics

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