Daniel R Roman acting Chief Geodesist Stephen Hilla GRD Chief Kevin Choi CORS Branch Chief NOAAs National Geodetic Survey April 24 2017 Geospatial Summit Silver Spring Modernizing the geometric reference frame ID: 718166
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Modernizing the geometric reference frameDaniel R. Roman (acting Chief Geodesist)Stephen Hilla (GRD Chief)Kevin Choi (CORS Branch Chief)NOAA’s National Geodetic Survey
April 24, 2017
Geospatial Summit, Silver Spring Modernizing the geometric reference frame
1Slide2
OutlineKey ElementsFour New FramesEuler PolesNEV or IFV (hor. & vert.)Velocity Models or DIYNADCON 5.0Poll QuestionsApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame2Slide3
Key ElementsDrawn from Blueprint Part 1 (forthcoming)Will be tied to most recent ITRF (2020?)Epoch date TBD – likely 2020.0Four Frames: North America, Pacific, Caribbean, and MarianaAt epoch date, all frames identical to ITRFThen each frame rotates about an Euler poleVelocity models describe motion in frameAccess to the four frames via OPUS tool April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame3Slide4
NSRS Modernization: Four New Frames
The Old:
NAD 83(2011)
NAD 83(PA11)
NAD
83(MA11)
The New:
The North American Terrestrial Reference Frame of 2022
(NATRF2022)
The Caribbean Terrestrial Reference Frame of 2022
(CTRF2022
)
The
Pacific Terrestrial
Reference Frame of 2022
(PTRF2022)
The Mariana Terrestrial Reference Frame of 2022 (MTRF2022)
April 24, 2017
Geospatial Summit, Silver Spring Modernizing the geometric reference frame
4Slide5
Four Frames/Plates in 2022ION ITM 2017 Monterey CA 30 January - 02 February 2017Session A1: Modernized and Emerging GNSS5NATRF2022
CTRF2022
PTRF2022
M
TRF2022
Image from
Snay
2003Slide6
Replacing the NAD 83’sApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frameThree plate-(pseudo)fixed frames will be replaced with four plate-fixed reference framesN. Amer., Pacific, Mariana, Caribbean(new!)Remove long-standing non-geocentricity of NAD 83 framesAll four : identical to ITRFxx at a TBD epoch2020.00?All four : differ from ITRFxx by plate rotation onlyUpdated Euler Pole determination for rigid plate only6Slide7
Plate-(pseudo)fixed framesApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frameNAD 83(NSRS2007)Epoch 2002.0NAD 83(2011)Epoch 2010.0If NAD 83 were truly “platefixed” then an 8 year epoch change would notyield the systematic plate rotation seen here.(*)TRF2022 will determinea new Euler Pole rotationfor each of 4 plates.
(*)=NA, C, T or P
NAD 83(2011) minus NAD 83(NSRS2007)
7Slide8
April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame
~
2.2
m
NAD 83 origin
ITRFxx
origin
Earth’s Surface
h
NAD83
h
IGSxx
f
NAD83
–
f
ITRFxx
l
NAD83
– lITRFxx
hNAD83 – hITRFxx
all vary
smoothly by latitude
and
longitude
same
GRS-80
ellipsoid
NAD 83’s non-
geocentricity
8Slide9
April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frameEach frame will get 3 parametersEuler Pole LatitudeEuler Pole LongitudeRotation rate (rad/yr)Used to computetime-dependent TRF2022 coordinates from time-dependent ITRF coordinates. 9Slide10
Fixed-Epoch Transformation NAD 83 to “2022”April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame10Slide11
April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frameNATRF2022 frame is rigid and fixed to rigid part of the N.A. plate
Non-rigid part of the N.A. plate
(deformation)
area
11Slide12
April 24, 2017
Geospatial Summit, Silver Spring Modernizing the geometric reference frame
Point on
rigid
part of plate
Point on
deforming
part of plate
l
l
t
t
NATRF2022 coordinates over time
(Remember: The NATRF2022
frame
is rigid)
12Slide13
April 24, 2017
Geospatial Summit, Silver Spring Modernizing the geometric reference frame
Point on
rigid
part of plate
Point on
deforming
part of plate
l
l
t
t
NATRF2022 coordinates over time
(Remember: The NATRF2022
frame
is rigid)
13Slide14
April 24, 2017
Geospatial Summit, Silver Spring Modernizing the geometric reference frame
Point on
rigid
part of plate
Point on
deforming
part of plate
l
l
t
t
NATRF2022 coordinates over time
(Remember: The NATRF2022
frame
is rigid)
14Slide15
April 24, 2017
Geospatial Summit, Silver Spring Modernizing the geometric reference frame
Point on
rigid
part of plate
Point on
deforming
part of plate
l
l
t
t
NATRF2022 coordinates over time
(Remember: The NATRF2022
frame
is rigid)
15Slide16
NEV or IFVEuler poles mostly account for horizontal vel.Remaining signal currently modeled by HTDPHTDP complicated to maintain and only horizontalSo if not HTDP, then what?A TBD velocity model needed for horizontal and vertical motions (e.g. 3D)Non-Eulerian Velocity (NEV) vs. Intra-Frame Velocity (IFV)Simplest solution is to grid CORS velocitiesApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame16Slide17
Horizontal velocities after Repro1April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame17Note scale difference between West (10 mm/yr) and east (2 mm/yr)Slide18
Residual Horizontal Velocities CONUS – gridded CORSEastern CONUS will largely be resolvedWestern CONUS has some anomaliesApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame18Slide19
CORS Implied Vertical Velocities - ControlApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame19Courtesy Galen ScottSlide20
CORS Implied Vertical Velocities – Heat MapApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame20Courtesy Galen ScottSlide21
CONUS with 1+ mm/yr April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame21Courtesy Galen ScottRed is uplift, Blue is subsidenceSlide22
CONUS with 2+ mm/yr April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame22Courtesy Galen ScottRed is uplift, Blue is subsidenceSlide23
CONUS with 3+ mm/yr April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame23Courtesy Galen ScottRed is uplift, Blue is subsidenceSlide24
CONUS with 4+ mm/yr April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame24Courtesy Galen ScottRed is uplift, Blue is subsidenceSlide25
AK CORS Implied Vertical Velocities – ControlApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame25Courtesy Galen Scott Slide26
AK CORS Implied Vertical Velocities – Heat MapApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame26Courtesy Galen ScottSlide27
How to use this information?Assuming CORS spacing is sufficient – gridYields horizontal (NEV & GIA) plus vertical signalVertical important for orthometric heights: Ht = (ht0 + (t-t0)*dh/dt) - (Nt0 + (t-t0)*dN/dt)Where Ht is orthometric height at desired timeht0 is ellipsoidal height at epoch (maybe 2020.0)Nt0 is geoid height at epochdh/dt is change in ellipsoid height over timedN/dt is change in geoid height over time (GeMS)April 24, 2017
Geospatial Summit, Silver Spring Modernizing the geometric reference frame
27Slide28
Velocity Models or DIYWe will investigate sufficiency of gridded CORSConcern is dynamic areas: horizontal & verticalWill gridded CORS work in Alaska?What if this isn’t enough?Will look at other models to evaluateCost – benefitWhat we can easily do in-house and supportincreased complexity from outside modelsAlternatively, users can model their own …April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame28Slide29
April 24, 2017 CORS best estimate of dh/dt: -2.2 mm / yearNATRF2022 best estimate of dh/dt: -4.2 mm / year
NAD 83 best
estimate of dh/
dt
:
+2.8
mm / year
Time-Dependencies as a service:
NATRF2022 and actual survey epochs
NAD 83 forcibly combined data spanning many years (using HTDP with no vertical modeling) to compute and find
one
height at
one
epoch.
NATRF2022 will compute coordinates at survey epoch to show actual motion.
Even gridding surrounding CORS yields better subsidence rates than you have today.
Geospatial Summit, Silver Spring Modernizing the geometric reference frame
29Slide30
Time Dependencies as a service:Intra-plate motionsApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame30Slide31
NADCON 4.2 in the new Geodetic ToolkitApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference framehttps://beta.ngs.noaa.gov/gtkweb/ 31Slide32
The new Geodetic Toolkitwith NADCON 5.0April 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference framehttps://dev.ngs.noaa.gov/gtkweb/
32Slide33
X, Y, ZNAD 83 (2011)Allowable Regions:CONUSAlaskaHawaiiPR/VIASGuam/CNMISt. PaulSt. GeorgeSt. LawrenceUSNG
UTM
SPC
f
,
l
, h
x
yz2plh
plh2xyz
a,f
(GRS 80)
UTMS
a,f
(GRS 80)
SPC83
NAD 83 USNGNAD 83 USNGNAD 83Notes:Slide34
X, Y, ZUSNGUTMSPC
f,
l, h
X, Y, Z
USNG
UTM
SPC
f
,
l
, h
X, Y, Z
USNG
UTM
SPC
f
,
l
, h
X, Y, Z
USNG
UTM
SPC
f
,
l
, h
X, Y, Z
USNG
UTM
SPC
f
,
l
, h
X, Y, Z
USNG
UTM
SPC
f
,
l
, h
X, Y, Z
UTM
f
,
l
, h
Region: CONUS
NADCON 5 connections in RED
X, Y, Z
USNG
UTM
SPC
f
,
l
, h
USSD
NAD 27
NAD 83 (1986)
NAD 83 (2011)
NAD 83 (NSRS2007)
NAD 83 (FBN)
NAD 83 (HARN)
2022
April 24, 2017
Geospatial Summit, Silver Spring Modernizing the geometric reference frame
34Slide35
Thank you!Daniel R. Roman, acting Chief Geodesist Dan.Roman@noaa.gov Dru A. Smith, NSRS Modernization Manager Dru.Smith@noaa.govStephen Hilla, Chief Geosciences Research Division Steve.Hilla@noaa.govKevin Choi, Chief CORS Branch Kevin.Choi@noaa.govApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame35Slide36
Up NextPoll QuestionsQ& A periodApril 24, 2017Geospatial Summit, Silver Spring Modernizing the geometric reference frame36