1 / 30

GEOID09, New Datums, Visualizing Geodetic Control, plus some other stuff

GEOID09, New Datums, Visualizing Geodetic Control, plus some other stuff. Marti Ikehara California Geodetic Advisor CLSA Los Angeles Chapter, April 2010. ftp://ftp.ngs.noaa.gov/pub/marti. GEOID09 published in Sept 09.

carrie
Download Presentation

GEOID09, New Datums, Visualizing Geodetic Control, plus some other stuff

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. GEOID09, New Datums, Visualizing Geodetic Control, plus some other stuff Marti Ikehara California Geodetic Advisor CLSA Los Angeles Chapter, April 2010 ftp://ftp.ngs.noaa.gov/pub/marti

  2. GEOID09 published in Sept 09 • In California, GEOID03 considered 567 bench marks with GPS data (ellipsoid heights), and kept 549 • In GEOID09, there were 833 considered; 738 were included, a 36% increase from Geoid03

  3. GEOID09 compared to GEOID03 09: teal, good; yellow: State advisor-rejected; red: analysis-rejected 03 (underlying dots): dk blue, kept; orange: rejected

  4. From Helmer’s article in Winter 09/10 issue of California Surveyor

  5. 738 BMs .234, .132 | .000,.022 CALIFORNIA .044 m, 95% confidence

  6. Rationale for new vertical datum • Rather than ‘force’ GNSS data to fit a datum that was defined by a completely different system of measurement and has a bias relative to our understanding of the gravity field, we plan to define the new vertical datum by: --utilizing the ellipsoid height --AND a geoid model based on real gravity measurements on a national scale—airborne gravimeters and some ground-collected data --with updates when changing conditions warrant

  7. Evolution of Geodetic Datums: from NAD27/NGVD29 to NAD83/NAVD88 to ?/ ? GPS H + V 2 + 1 27, 29 H + V 2 + 1 83(86), 88 H + VE+ VO 2 + 1 + 1 83(92), 88 +VELOCITIES (time) H + Ht+ VE +VO 2 + 2 + 1+ 1 83(07)+HTDP, 88 H + Ht+VE+ VEt 2 + 2 + 1+ 1 GEOMETRIC (VE+G)[+VEt] + Gt 1 + 1 GEOPOTENTIAL H + Ht+VE+ VEt 2 + 2 + 1+ 1 ITRF00 (2002.00) + GRAVITY (geoid model)

  8. http://www.dot.ca.gov/hq/row/landsurveys/geodetic/geodetic_control.htmlhttp://www.dot.ca.gov/hq/row/landsurveys/geodetic/geodetic_control.html

  9. Kml’s and shapefiles downloadable

  10. 5 data types available/possible: HVL, H, CORS, VL and HVHM

  11. Using NGS DSWORLD software and Google Earth to get any vintage geodetic data from NGSIDB Start by downloading “Google earth” at: http://earth.google.com/download-earth.html Click here

  12. Open the NGS main page atwww.ngs.noaa.gov Mouse-over the “TOOLS” button Click on “DOWNLOAD PC SOFTWARE”

  13. Clickonthe link: “UserContributedSoftwareisalsoavailable…..” Click here

  14. Next, click on the DSWORLD (Version *.**) link. A “file download” window will appear. Choose to save the file where you can easily find it. It will be a zip file, so you will need to unzip it and then double click on the setup.exe file. That will install the program for you. For additional information or assistance, please contact your NGS State Geodetic Advisor

  15. CRTN Backbone Royal blue: Up (more than B.b.) Red: Down (at that moment) Lavender: PBO’s Cascadia Turquoise: Proposed, need funding partners

  16. Elements of CRTNCA Real Time Network • Currently, single base positioning available free • How do you get it? Contact Yehuda Bock, CSRC • Goal: RT data streaming to partners • Partners could be public agencies, private providers of RTN service • Funds needed to establish telemetry at 78 sites • Operational partners: MWD, USGS, SOPAC, Counties: LA, Orange, SD, and UNAVCO PBO

  17. New PublicationOnline pubs, quick link in Left columnlook under GPS Category, 5th last bullet Living Document; not a formal publication

  18. NGS and RTNs • Draft RTN Guidelines indicate that RTN providers should incorporate some CORS (10%, minimum of 3) into their network • Doing so will enable connection with the NSRS or CSRS in the case of CRTN, and providers could give PRC coordinates not just corrections • NGS may ‘certify’ RTN providers, after reviewing practices, adjustment, etc • NGS long-term goal is to have national backbone of RT CORS that we operate: look for documents about “OnCORS”

  19. THANK YOU! marti.ikehara@noaa.gov

More Related