ESA (ITT) Goce + Height System Unification Roadmap (2011-2014): - - PowerPoint PPT Presentation

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ESA (ITT) Goce + Height System Unification Roadmap (2011-2014): - - PowerPoint PPT Presentation

May 20, 2023 137 likes •335 views

Results from GOCE++ Dynamical Coastal Topography and tide gauge unification using altimetry and GOCE. Ole B. Andersen, P Knudsen, K. Nielsen, C. Hughes, P. L. Woodworth, R. Bingham, G. Woppelmann, M. Gravelle, L. Fenoglio-Marc, M. Kern ESA

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Results from GOCE++ Dynamical Coastal Topography and tide gauge unification using altimetry and GOCE. Ole B. Andersen, P Knudsen, K. Nielsen, C. Hughes,

  • P. L. Woodworth, R. Bingham, G. Woppelmann, M.

Gravelle, L. Fenoglio-Marc, M. Kern

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2 DTU Space, Technical University of Denmark

ESA (ITT) Goce + Height System Unification Roadmap (2011-2014):

2015: ESA issued an ITT (GOCE ++) To focus on individual elements Project still

  • ngoing until

late 2017

Courtesy: Gruber et al., 2014)

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3 DTU Space, Technical University of Denmark

Objectives and scope.

  • Propose and develop an approach to estimate a consistent

DT at tide gauges, coastal areas, and open ocean

  • Determine a consistent MDT using GOCE with consistent

error covariance fields.

  • Connect measurements of a global set of tide gauges and

investigate trends

  • Develop and outlook how the approach could be further

improved using improved coastal altimetry.

  • Validate the approach in well-surveyed areas where DT

can be determined at tide gauges

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4 DTU Space, Technical University of Denmark

Test Regions.

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5 DTU Space, Technical University of Denmark

Evaluating Ocean MDT vs TG MDT (= MSS-N)

Geoid MDT

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6 DTU Space, Technical University of Denmark

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7 DTU Space, Technical University of Denmark

Australia Getting MSS closer to the coast

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8 DTU Space, Technical University of Denmark

Coastal Altimetry Updating the Coastal MSS GOT 4.10 vs FES2012.

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9 DTU Space, Technical University of Denmark

Software Architecture for creating coastal MDT

GOCE++DYCOT Coastal MDT Software Toolbox.

  • Written in R.
  • Command line interface.
  • Allow filtering combining different MSS + GOCE geoids
  • Allos integration of MDT with TG,
  • Error estimation.
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10 DTU Space, Technical University of Denmark

Creation a consistent MDT in coastal region and the coast using GOCE+Altimetry+TG. Here test-region with ”well known” MDT

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11 DTU Space, Technical University of Denmark

Here: Raw unfiltered MDT = DTU13MSS – EIGEN-6C4 GEODETIC MDT DOES FREQUENTY NOT SATISFY COASTAL DYNAMICS

Bridging the Coastal Gap for Geodetic MDT.

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12 DTU Space, Technical University of Denmark

Gaussian Filtering 0.6 dg. Each Contour line represent 1 cm MDT

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13 DTU Space, Technical University of Denmark

GOCE++ Approach Iterative box-car filtering with resetting of land values at each iteration. Here: R = 0.15deg, 15 iterations. Land values set to 5 cm. Better contours at coast. But

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14 DTU Space, Technical University of Denmark

Integrating with Drifters enhances sw signal (DTU17MDT+Drifter)

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15 DTU Space, Technical University of Denmark

ROMS MDT (courtesy of John Wilkin@Rudgers) Contour interval = 1 cm

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16 DTU Space, Technical University of Denmark

MDT Error estimate

A new bootstrap approach is used The selected region is divided into blocks Sample with replacement between the different blocks count the number of repetitions per block Use the iterative average filter function

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17 DTU Space, Technical University of Denmark

Integration with Tide gauges

  • Setteled for a fixed period (2003-2007) where ocean/altim MDT

and TG are processed consistenly.

  • IB correction must me accounted for.
  • Tide System convertion must me accounted for.
  • System is sensitive to the value on land

GOCE++ SW accounts for this

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18 DTU Space, Technical University of Denmark

Integration with SONEL GPS Measured Tide Gauges (Ellipsoidal height)

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19 DTU Space, Technical University of Denmark

Summary

  • GOCE ++ DYCOT results are appearing on gocedt.eu and paper is

in preparation.

  • MDT evaluation with Tide Gauges is promising for ”geodetic

approach”, and in general agreement on the 5-10 cm is found.

  • GOCE++DYCOT has developed an approach to estimate a

consistent DT at tide gauges, coastal areas, and open ocean

  • An approach to determine error estimates on MDT is being tested
  • Connect measurements of a global set of SONEL tide gauges

performed and trends are now available.

  • More to follow.
  • Develop and outlook how the approach could be further improved

using improved coastal altimetry.