NGS Updates MARTI IKEHARA, Geodetic Advisor CLSA Monterey Chapter June 2011.

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Presentation transcript:

NGS Updates MARTI IKEHARA, Geodetic Advisor CLSA Monterey Chapter June 2011

Topics for discussion CBL Process CBL Site Characteristics Adoption of new reference frame for CORS Subsequent adjustment for passive stations HTDP CGAR Developments of various NGS products

CBL Process Location, Location, Location, L ocation (access) Selection, permission, layout, install 4 mons Find donor or pay for materials, labor Personnel: Gun, recorder, prisms, ‘runner’ Training: ‘on-the-job’ Measurement: Two LONG days. Equipment handoffs before and after, usually

CBL Site characteristics Length 1 km; difficult to see farther Relief: flat to slight dip in center Slope: <1% m; <3% m LOS over a single type of ground— – Dirt, grass, pavement, water No interference (reflective) sources (signage) Install 4 monuments, let cure 4-6 months

CORS Reference Frame Changing Current ITRF NAD83(CORS96) Relative antenna calibration ITRF2000, defined by only 8 global stations Upcoming IGS08 (2011) NAD83(2011) Absolute ITRF2008 uses ~230 stations What does this all mean? Average differences of NAD 83(2011) epoch minus NAD 83(CORS96) epoch : East -0.18±1.86 cm; North 0.14±1.07 cm; Vertical 0.17±2.11 cm < 2 mm +/- 1-2 cm (nationally)

Same epoch date—2002.0; NAD83 (2011) vs (CORS96)

News that IMPACTS the CORS program, June 15, 2011 (today) New CORS Coordinates

Updates ed directly to you with subject "Subscribe NGS_CORS_news“ 04/20/ NGS Launches Public News Subscription Service NOAA's National Geodetic Survey (NGS) now has a subscription news service to keep the public informed of NGS activities. Subscribing (and unsubscribing) is easy!...more 04/20/ NGS Launches Public News Subscription Servicemore subject “Subscribe NGS.news” This story found on ‘main’ NGS page (chron order)

Passive network update In order for the coordinates of passive stations to maintain consistency with the CORS’ representation of the NSRS, NGS will be doing another national adjustment this year The datum tag that will be adopted for both CORS (active) and passive is NAD83(2011) CORS (only) will be the control for the LSA

What will be included? 4127 projects projects for 2007 adjustment, 21% increase 77,694 stations --67,693 stations, 15% increase 398,588 vectors --313,477 vectors, 27% increase FAQ document link available in news story 5/27/2011 at

HTDP v 3.1 Interactively estimate displacements between two dates. Individual points entered interactively or Individual points entered interactively Points on a specified grid Select NAD83(CORS96) or NAD83(NSRS2007) Select the dot for Deci-year format

/geodetic/geodetic_control.html CGAR (CA Geodetic Advisor Resources) website Google Earth display, or Google Maps Geodetic Control Stations for California: NAD83(NSRS2007) and NAVD88 only Link to real-time Datasheet

Guidelines for Real Time GNSS Networks - Draft Release found via Science and Education tab, then online Publications page under the subject GPS: Technology, Orbits, CORS. The direct link: Comments desired now(soon); write to:

project planning / monitoring automated file management review repeat measurements reports sent to project managers network adjustment publish in NGS OPUS database OPUS-Projects Under Construction

GRAV-D Survey in California, Jan/Feb 2011

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