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Sunday 22 April 2018

Welcome Reception 19:00

 

Monday 23 April, 2018

9:00- 10:00 International Review Opening.

10:00-10:30 Coffee Break

10:30-12:30 Session 1: Fiducial Reference Measurements for Altimetry and Metrology.
Chairs: Craig Donlon, Stelios Mertikas

The concept of Fiducial Reference Measurements for Altimetry. Why it is important? Altimeter measurement equation and uncertainties. The uncertainty budget of all FRM instruments and derived results over the entire end-to-end duration of a satellite mission. Procedures in satellite altimetry so that results are traceable to SI-units, reliable in the long term, comparable worldwide to support an objective and unquestionable monitoring of the Sea Level and Climate Change.

12:30-14:00 Lunch

14:00-15:40 Session 2: Past and Current International Cal/Val Activities.
Chairs: Bruce Haines, Pascal Bonnefond

Determining uncertainties in the fundamental instrument observations and in the Level-2 geophysical data products is a continuing process that involves participation of both the project teams and the scientists. The principal objectives of joint verification are to: 1) assess the performance of the measurement system, including the altimeter and orbit-determination subsystems; 2) improve ground and on-board processing; 3) enable a seamless and accurate connection between the past, current and future missions. To succeed in these objectives, the general approach is to pool the talents and resources of the project and science teams. Engaging the science teams in the continuous Cal/Val effort has been one of the hallmarks of success for the TOPEX/Poseidon and Jason altimeter programs.

Cal/Val activities are conducted based on dedicated in-situ observations, statistics, cross comparisons between models, different algorithms and external satellite data. The studies go well beyond validation of the overarching error budget underlying the mission requirements. They focus in particular on the temporal and geographically correlated characteristics of the errors. Reduction of this class of errors is critical, since they are conspicuously damaging to estimates of ocean circulation and sea level. Cal/Val activities also encompass issues related to data return, such as data editing and flagging. Participants from all Cal/Val infrastructure of the world (European Space Agency, EUMETSAT, NASA, CNES, Indian Space Research Organization, China, France, Greece, Australia, India, Japan, Brazil, Spain, United Kingdom, Germany, etc.) are to get involved in this Session.

15:40-16:10 Coffee Break

16:10-17:30 Session 2: Past and Current International Cal/Val Activities.
Chairs: Mingsen Lin, Christopher Watson

 

Tuesday 24 April, 2018

8:20-10:00 Session 3: Evaluating Uncertainties for Earth Observation with Metrology Standards.
Chairs: Nigel Fox, Remko Scharroo

Define requirements and establish standards and provide recommendations and best practices for altimerty calibration such that all measurements and results made for monitoring the Earth, the environment, the sea level, etc., are well-characterized and linked to other areas of science and technology through a world’s measurement system established and maintained under the International System of Units and Metrology Standards.

10:00-10:30 Coffee Break

10:30-12:30 Session 3: Evaluating Uncertainties for Earth Observation with Metrology Standards.
Chairs: Aloke K. Mathur, Ambrus Keyneres

12:30-14:00 Lunch

14:00-15:40 Session 4: Calibration of Future Satellite Altimetry.
Chairs: Jérôme Benveniste, Pierre Féménias

Satellite altimetry was developed in the 1970s-80s to advance the science of geodesy and oceanography on global scales. Its calibration and validation (CalVal) had been focused on the absolute height of sea surface at a few selected sites. Because of the stringent measurement accuracy requirement for oceanography, altimetry CalVal has been extended to the measurement accuracy at various scales. The ultimate goals of altimetry in oceanography is to demonstrate that the sea surface height (SSH) measurement can be related to the ocean surface topography, defined as the difference between the SSH and the geoid, after the corrections for the measurement errors as well as the effects of high-frequency motions (period shorter than ~ 1 day) on SSH. The goals of CalVal for oceanography are then focused on the accuracy of the ocean surface topography.

The oceanographic goals of future missions like SWOT are to extend the observations of ocean surface topography to 2 dimensions over wavelengths shorter than 150 km, posing significant challenges to CalVal. Over these wavelengths, the effects of high-frequency motions become difficult to remove by models. In-situ observations are required to assess their impacts on the validity of the ocean surface topography.Over the past decade, the utility of satellite altimetry for land hydrology has been recognized. The storage of lakes and discharge of rivers are part of the science goals of future missions like SWOT. CalVal of altimetry over land waters on scales of 1 km and less requires new ideas and commitments. Moreover, the spatial resolution of the future missions will make altimetry measurement ever closer to the boundary of land and sea, making CalVal right at the coast, including estuaries, an important task.

A key legacy of the past altimetry record is the establishment of a benchmark to detect the effects of climate change in the future. Therefore a challenge in the CalVal is to define and document procedures, protocols and best practices to maintain satellite altimetry observations to support the Earth Observation for the future, such as those of Sentinel-3, Sentinel-6/Jason-CS, SWOT, CFOSAT, ICESat-2, Sentinel-9, etc.

15:40-16:10 Coffee Break

16:10-17:30 Session 4: Calibration of Future Satellite Altimetry.
Chairs: Lee Lueng Fu, Jean-Francois Crétaux

 

Wednesday 25 April, 2018

8:20-10:00 Session 5: Maintaining the EO climate record from altimetry & ESA Climate Change Initiative.
Chairs: Robert Cullen, Erik de Witte

What do we need for calibration future altimeter missions? How can we work together to achieved this? Are we agreed about the FRM methods? How do we compare methods at different Cal/Val sites? What do we need to maintain the Earth Observation climate data record from altimetry? Do we have the right setup for the job? What are the threats, opportunities and challenges to address in the next 20 years of altimetry?

10:00-10:30 Coffee Break

10:30-12:30 Session 5: Maintaining the EO climate record from altimetry & ESA Climate Change Initiative.
Chairs: Robert Cullen, Erik de Witte

12:30-14:00 Lunch

14:00- 15:40 Session 6: The Changing Environment.
Chairs: Roland Pail, Xiaoli Deng

With the ever increasing spatio-temporal resolution and improved accuracy of geodetic sensors, new target areas can be approached and new contributions to neighboring disciplines can be achieved with geodetic monitoring. This session invites contributions from studies which employ modern geodetic sensors to monitor and observe natural hazards and the Earth' changing environment on multiple-scales. The geodetic sensors used may include GNSS, satellites (altimetry, SAR, gravimetric), spaceborne and airborne Lidar, gravimetry, tide gauges and buoys, and surveying based on and/air/ship-borne platforms. Primary target areas include natural hazards due to earthquake cycles, volcanoes, subsidence and deformation of the Earth' surface, sea level change, Arctic/Antarctic change, sea ice dynamics, melting of glaciers and ice sheets, permafrost change and flooding. Secondary targets involve changes in the Earth' environmental systems; vegetation, geomorphology, urban environments, surface water, avalanches and snow cover, rivers and lakes. It should be emphasized that this session will focus on integrated studies covering both geodetic sensors and target systems rather than focusing on improvements of sensors or numerical modelling of systems alone.

15:40-16:10 Coffee Break

16:10-17:30 Session 7: Polar Regions Applications.
Chairs: Lars Stenseng, Per Knudsen

This Session is to focus on topics like: Altimetric challenges caused by sea ice and ice debris; Modelling mean sea surface, mean dynamic topography, and gravity field from altimetry in a noisy environment; Limited observations for validation; Closing the polar gap, etc.

 

Thursday 26 April, 2018

8:20-10:00 Session 8: Modelling with Altimetry bathymetry, geoid, sea level, gravity, heights.
Chairs: Ole B. Andersen, Denise Dettmering

Space-based Earth observations by satellite altimetry have evolved to operational remote sensing techniques with important interdisciplinary applications to many Geosciences. This session focuses on potential and already realized applications of this technique, latest results and new developments with specific impact to geodetic science. Topics to be covered in this session include, but are not limited to (1) precise mapping and monitoring the oceans on different scales (sea level rise, surface currents, tides, storm surges, etc.) (2) improvement in marine gravity modelling by refined analysis of altimetry data or by combination with other data sets, (3) using satellite altimetry for bathymetry mapping, and (4) inland water applications of satellite altimetry.

10:00-10:30 Coffee Break

10:30-12:30 Session 8: Modelling with Altimetry bathymetry, geoid, sea level, gravity, heights.
Chairs: Ole B. Andersen, Denise Dettmering

Space-based Earth observations by satellite altimetry have evolved to operational remote sensing techniques with important interdisciplinary applications to many Geosciences. This session focuses on potential and already realized applications of this technique, latest results and new developments with specific impact to geodetic science. Topics to be covered in this session include, but are not limited to (1) precise mapping and monitoring the oceans on different scales (sea level rise, surface currents, tides, storm surges,etc.) (2) improvement in marine gravity modelling by refined analysis of altimetry data or by combination with other data sets, (3) using satellite altimetry for bathymetry mapping, and (4) inland water applications of satellite altimetry.

 12:30-14:00 Lunch

14:00-15:40 Session 9: The Global Geodetic Observing System (GGOS).
Chairs: Roland Pail, Christopher Watson

Measurements of the Earth’s rotation, shape, and gravity provided by global geodetic observing systems show that they change on a wide range of time scales reflecting the wide range of processes affecting them, from external tidal forces to surficial processes involving the atmosphere, oceans, and hydrosphere to internal processes acting both at the core-mantle boundary as well as within the solid Earth itself. Measurements taken by global geodetic observing systems can therefore be used to gain greater understanding of a wide variety of dynamic Earth processes, from tracking water in its various phases as it cycles through the atmosphere, oceans, and land, to crustal deformation associated with tectonic motions and glacial isostatic adjustment, to torsional oscillations of the core. This session will be a forum for discussing the present status and future evolution of global geodetic observing systems and their use to investigate dynamic Earth processes.

15:40-16:10 Coffee Break

16:10-17:30 Session 10: International Cal/Val Review Summary and Conclusions.
Chairs: Craig Donlon, Stelios Mertikas

A Scientific Steering Committee with the key players in satellite altimetry Cal/Val shall be developed. A Scientific and Operational Roadmap will be built on the outputs, knowledge and tools developed by this International Review on Altimetry Cal/Val and Applications. This Roadmap shall: (1) Provide a critical analysis of all the feedbacks from participants and institutions working in Cal/Val Activities, (2) Identify potential strategies for integrating this International Review outcomes into existing initiatives and operational institutions; (3) Define a plan for fostering a transition of FRM4ALT methods and results from research to operational activities; (4) Identify priority areas to be addressed in potential future projects in support of CEOS calibration and validation activities.The members of this Committee as well as the keynote speakers shall be the ones that will attract other researchers to participate. The outcomes of this International Review shall be broadly disseminated to all science teams of future altimetry and Earth observation, such as the Sentinel-3, Sentinel-6, Sentinel-9, SWOT, Compira, HY mission, ICESat, SARAL, Jason series, etc.

 

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Frm4alt International Review Workshop

“International Review Workshop On Satellite Altimetry Cal/Val Activities and Applications"

23-26 April 2018,
Chania, Crete, Greece.

Workshop url

Slide1 

 

Transponder calibration

Transponder calibration at the CDN1 ESA Altimeter Calibration Site:

  • CryoSat-2 on 5-Feb-2018 18:41:47 UTC (Previous Cal/Val 5-Jan-2018 at 8:04:26 UTC),
  • Tandem mission of Jason-2 and Jason-3, March-October 2016,
  • Jason-3 continuously every 10 days after its launch,
  • Sentinel-3A every 27 days at 20:00:12 UTC continuously after its launch.