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Introducing vertical transformations in ArcGIS

Introducing vertical transformations in ArcGIS. Melita Kennedy. Objectives. Vertical coordinate systems ArcGIS Coordinate Systems Data setup Horizontal-vertical transformations list. Vertical Coordinate System. Datum or Vertical Datum. Linear Unit. Vertical Shift. Direction.

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Introducing vertical transformations in ArcGIS

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  1. Introducing vertical transformationsin ArcGIS Melita Kennedy

  2. Objectives • Vertical coordinate systems • ArcGIS Coordinate Systems Data setup • Horizontal-vertical transformations list

  3. Vertical Coordinate System Datum or Vertical Datum Linear Unit Vertical Shift Direction

  4. Vertical CS details • Datum • ellipsoidal height/depth datum • Vertical Datum • gravity-related datum

  5. Vertical CS details • Direction • axis direction is positive ”up” or “down” • Vertical Shift • extra parameter that could allow a built-in offset from the VCS definition

  6. VCS well-known text • WKID: EPSG:5703 • VERTCS["NAVD_1988",VDATUM["North_American_Vertical_Datum_1988"],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Meter",1.0]]

  7. Vertical coordinate systems • 285 as of 10.4.0 • NGVD29 • NAVD88 (m and USft) • NN2000 • Trieste • NZVD2009 • EVRF 2007 • Newlyn • NAP • AHD • CGVD 1928 • Malin Head • Dansk Normal Nul • HKPD / HKCD • RH2000 • Constanta • Moorea SAU 1981 • GHA • Ellipsoidal height-based

  8. Tidal Datums • MSL • LAT • LLWLT • LW • HW • ISLW • MLLWS • MLWS • MLLW • MLW • MHW • MHHW • MHWS • HHWLT • HAT • LW • HW • Instantaneous water level

  9. Vertical Transformation Vertical Coordinate System - Source Geographic Coordinate System VT Method Vertical Coordinate System - Target Parameters

  10. Well-known text • WKID: Esri:110009 • VERTTRAN["NGVD29_To_NAVD88_NAD27_ECW",GEOGCS["GCS_North_American_1927",DATUM["D_North_American_1927",SPHEROID["Clarke_1866",6378206.4,294.9786982]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],VERTCS["NGVD_1929",VDATUM["National_Geodetic_Vertical_Datum_1929"],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Foot_US",0.3048006096012192]],VERTCS["NAVD_1988",VDATUM["North_American_Vertical_Datum_1988"],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Meter",1.0]],VTMETHOD["VERTCON"],PARAMETER["Dataset_vertconecw.94",0.0]]

  11. Vertical transformation methods • Geoid models • EGM2008 • EGM84 and EGM96 • GEOID12B • VERTCON • Vertical offset • Vertical offset and slope

  12. ArcGIS Coordinate Systems Data • 1.5 GB • GEOCON v1.0 • NAD 1983 HARN, NSRS2007, 2011 • VERTCON • GEOID12B • EGM2008 • 1′ x 1′ and 2.5′ x 2.5′

  13. Demonstration Working with Vertical Transformations

  14. Future Work • Create custom vertical tfm tool • Function to find horizontal/vertical tfms given 2 GCS/VCS • Incorporate Vdatum • Have functions to read data files already • Add vertical transformations • Ship > 5 GB data? • Other geoid models • Older US • Canada/New Zealand/Australia/Japan • Raster team is adding VCS support • Will follow with transformation support

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  16. Thank you!

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