1 / 21

Gravity, Geoids, and Other Vertical Datums in the Puerto Rico/Virgin Islands Region

Gravity, Geoids, and Other Vertical Datums in the Puerto Rico/Virgin Islands Region. Dr. Daniel R. Roman and Dr. Yan Ming Wang. Geodetic Ellipsoidal Height and/or Datum (h) Geodetic or Orthometric Height and/or Datum (H) Geoid Height (N) h = H + N

marina
Download Presentation

Gravity, Geoids, and Other Vertical Datums in the Puerto Rico/Virgin Islands Region

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Gravity, Geoids, and Other Vertical Datums in the Puerto Rico/Virgin Islands Region Dr. Daniel R. Roman and Dr. Yan Ming Wang

  2. Geodetic Ellipsoidal Height and/or Datum (h) Geodetic or Orthometric Height and/or Datum (H) Geoid Height (N) h = H + N The geoid and gravity anomalies are related mathematically: Oceanographic Global Mean Sea Level (MSL) Local MSL (LMSL) or Local Mean Tide Mean Dynamic Topography (MDT) MSL + MDT = LMSL MSL => Geodetic Datum LMSL => Local Vertical Datum Significant Concepts & Terms

  3. “P” 0 Deflection of Vertical h = H + N Δg = gP - γQ Normal to geoid Normal to ellipsoid “P” H h Geopotential Surface “Ellipsoid” “Q” N Geopotential Surface “Geoid” Geopotential Surface Earth’s Surface OCEAN

  4. ellipsoid unexpected area of storm surge predicted storm surge reach tide station/datum point actual storm surge reach LMSL local geodetic datum MDT N MSL bias geoid MSL + MDT = LMSL

  5. From the National Geospatial-Intelligence Agency Website at: http://cddis.gsfc.nasa.gov/926/egm96/egm96.html

  6. Statistical Comparison Between Available Geoid Height Models and 13-Point GPS on BM Profile Along NW Puerto Rico Shoreline

  7. Available Elevation Data Sets SRTM 30 mSRTM 90 mNED 1 arcsecond

  8. Conclusions • Tidal and Geodetic datums are related • Additional gravity data are required • Geoid modeling is best constrained with additional oceanic gravity observations • Some limited terrestrial observations will help fill in gapped regions but also help to eliminate any datum problems

  9. Outlook • Improved terrain models already exist to help model the shortest wavelengths • Simultaneous lidar observations would help to model the local sea surface and any implied datum shifts • Impending satellite gravity missions aid in resolving global mean sea level • A future gravimetric geoid can be generated that will cover CONUS & PR/VI

More Related