ref_sys_ NGS

ref_sys_ NGS - DEVELOPMENT, IMPLEMENTATION AND FUTURE OF...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
DEVELOPMENT, IMPLEMENTATION AND FUTURE OF THE NATIONAL SPATIAL REFERENCE SYSTEM PROFESSIONAL LAND SURVEYORS OF OHIO TOLEDO FEBRUARY 11, 2000 David Doyle National Geodetic Survey 301-713-3178 daved@ngs.noaa.gov
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
NATIONAL GEODETIC SURVEY INFORMATION CENTER (301) 713-3242 NATIONAL OCEAN SERVICE WEB SITE http://www.ngs.noaa.gov
Background image of page 2
INTERESTING WEB SITES GIS/GPS/RS Web Forum http://www.ggrweb.com/webbbs.html The On-Line Resource for Professional Land Surveyors http://rpls.com NATIONAL OCEAN SERVICE
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
NATIONAL SPATIAL REFERENCE SYSTEM The National Spatial Reference System (NSRS) is that component of the National Spatial Data Infrastructure (NSDI) - [http://www.fgdc.gov/nsdi/nsdi.html] which contains all geodetic control contained in the National Geodetic Survey (NGS) Data Base. This includes: A, B, First, Second and Third-Order horizontal and vertical control, Geoid models such as GEOID 99, precise GPS orbits and Continuously Operating Reference Stations (CORS), observed by NGS as well as data submitted by other Federal, State, and local agencies, Academic Institutions and the private sector NATIONAL OCEAN SERVICE
Background image of page 4
METADATA METADATA IS DATA ABOUT DATA DATUMS NAD 27, NAD 83(1986), NAD83 (199X), NGVD29,NAVD88 UNITS Meters, U.S. Survey Feet, International Feet, Chains, Rods, Pole ACCURACY A, B, 1st, 2nd, 3rd, 3cm, Scaled NATIONAL OCEAN SERVICE
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
THE ELLIPSOID b a a = Semi major axis b = Semi minor axis f = a-b = Flattening a N S NATIONAL OCEAN SERVICE
Background image of page 6
ELLIPSOID DEFINITIONS NATIONAL OCEAN SERVICE CLARKE 1866 a = 6,378,206.4 m 1/f = 294.97869821 GEODETIC REFERENCE SYSTEM 1980 - (GRS 80) a = 6,378,137 m 1/f = 298.257222101 WORLD GEODETIC SYSTEM 1984 - (WGS 84) a = 6,378,137 m 1/f = 298.257223563 BESSEL 1841 a = 6,377,397.155 m 1/f = 299.1528128
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ELLIPSOID - GEOID RELATIONSHIP H h Ellipsoid GRS80 H = Orthometric Height N Geoid GEOID99 H = h - N PERPENDICULAR TO ELLIPSOID PERPENDICULAR TO GEOID (PLUMBLINE) DEFLECTION OF THE VERTICAL DEFLEC99 TOPOGRAPHIC SURFACE h = Ellipsoidal Height N = Geoid Height
Background image of page 8
THE GEOID AND TWO ELLIPSOIDS NATIONAL OCEAN SERVICE GRS80-WGS84 CLARKE 1866 GEOID Earth Mass Center Approximately 236 meters
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
HORIZONTAL DATUMS BESSEL 1841 -------------- LOCAL ASTRO DATUMS (1816-1879) NEW ENGLAND DATUM (1879-1901) U.S. STANDARD DATUM (1901-1913) NORTH AMERICAN DATUM (1913-1927) NORTH AMERICAN DATUM OF 1927 OLD HAWAIIAN DATUM CLARKE 1866 PUERTO RICO DATUM ST. GEORGE ISLAND - ALASKA ST. LAWRENCE ISLAND - ALASKA ST. PAUL ISLAND - ALASKA AMERICAN SAMOA 1962 GUAM 1963 GRS80 ----------- NORTH AMERICAN DATUM OF 1983 (As of June 14, 1989) NATIONAL OCEAN SERVICE
Background image of page 10
NO SPCS EXISTING NAD 27 ENACTED NAD 83 SPC LEGISLATION LEGISLATION LEGISLATION (4) (3) (45) District of Columbia Alabama Alaska Maryland (S) Oklahoma (S) Hawaii Arkansas Arizona (I) Massachusetts (S) Oregon (I) Nebraska Illinois California (S) Michigan (I) Pennsylvania (S) Puerto Rico Colorado (S) Minnesota Rhode Island Connecticut (S) Mississippi (S) South Carolina (I) I = International Feet and Meters Delaware(S)
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/17/2008 for the course GS 608 taught by Professor Brzezinska during the Spring '06 term at Ohio State.

Page1 / 64

ref_sys_ NGS - DEVELOPMENT, IMPLEMENTATION AND FUTURE OF...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online