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Second GGOS Unified Analysis Workshop
Grand Hyatt, San Francisco, CA 94108, USA, 11 - 12 December 2009
Programme
Friday- December 11
| 08:30 - 09:00 h | Registration |
| 09:00 - 09:10 h | Welcome Rothacher M., Richter B. |
| 09:10 - 09:25 h | Overview of UAW Goals Rothacher M. Download: Overview of UAW Goals (PDF, 4MB, Not barrier-free file.) |
| Description: | In this session each of the Services should present its present status of product generation, i.e., the products themselves, the standards, models, parameterizations, and processing strategies used. A list of the deficiencies and problems encountered by the various techniques is of special importance here and the Service should describe, how they are intending to improve these issues and what new strategies are considered to improve the technique and products in general. In addition, the metadata flow from the services to the GGOS Portal (meta data format) will have to be an important topic. Also an updated version of SINEX including necessary updates will be considered. |
| Goals: |
Understand the processing details and problems of the individual techniques Information about the improvements planned by each of the techniques Discuss ways to improve the deficiencies and cure problems in the future Define formats, data structures and data flows for metadata for the GGOS Portal New version of SINEX |
| PRESENTATIONS SERVICES (IVS, ILRS, IGS, IDS, IERS, IGFS): | |
| 09:25 - 09:35 h | IVS - Status of and Plans for Operations. Analysis and Combination Nothnagel A. Download: IVS - Status of and Plans for Operations. Analysis and Combination (PDF, 1MB, Not barrier-free file.) |
| 09:35 - 09:45 h | ILRS Official Products - Current and Future Pavlis E., Pearlman M. Download: ILRS Official Products - Current and Future (PDF, 1MB, Not barrier-free file.) |
| 09:45 - 09:55 h | IGS - Status Springer T. Download: IGS - Status (PDF, 329KB, Not barrier-free file.) |
| 09:55 - 10:05 h | IDS - Latest Developments and Perspectives Willis P., Lemoine F. Download: IDS - Latest Developments and Perspectives (PDF, 856KB, Not barrier-free file.) |
| 10:05 - 10:15 h | IERS - Products and Future Ma C., Rothacher M. Download: IERS - Products and Future (PDF, 478KB, Not barrier-free file.) |
| 10:15 - 10:25 h | ICGEM - The International Centre for Global Earth Models Barthelmes F., Köhler W. Download: ICGEM - The International Centre for Global Earth Models (PDF, 2MB, Not barrier-free file.) |
| 11:15 - 11:30 h | Position Paper "GGOS Portal, Meta Data" Richter B., Noll C. Download: Position Paper "GGOS Portal, Meta Data" (PDF, 4MB, Not barrier-free file.) |
| 11:30 - 11:40 h | Standards and Conventions Hugentobler U. Download: Standards and Conventions (PDF, 698KB, Not barrier-free file.) |
| 11:40 - 11:50 h | Updates to the SINEX format Rothacher M. Download: Updates to the SINEX format (PDF, 285KB, Not barrier-free file.) |
| International Gravimetric Bureau - Missions / Status Download: International Gravimetric Bureau - Missions / Status (PDF, 412KB, Not barrier-free file.) | |
| Description: | The geodetic/geophysical models used in data analyses still show significant deficiencies and are not really fully consistent among techniques and analysis centers. The various modeling problems (antenna effects, atmosphere, loading effects, etc.) should be addressed and possible solutions/improvements should be discussed. Of special importance is the fact, that in the future, the modeling of the observations will depend more and more on large amounts of external data (e.g., meteorological models for mapping functions and a priori delays, ocean models for non-tidal loading effects, hydrological models for hydrological loading, etc.). This can be considered a paradigm change in reference system definition and realization, because these external data sets will have to be available for all high-precision realizations of the frame, be it in post-processing or (near) real-time applications. The benefit from corrections based on external data and the implications thereof should be addressed. |
| Goals: |
Improve the accuracy and consistency of the geodetic/geophysical models used Assess the benefits of correction models based on large external data sets Discuss the implications of the paradigm change (from corrections based on _simple_ mathematical formulas and corrections based on large amounts of external data |
| 13:30 - 13:45 h | Position Paper "Modeling Deficiencies and Modeling based on External Data" Böhm J., Van Dam T. Download: Position Paper "Modeling Deficiencies and Modeling based on External Data" (PDF, 139KB, Not barrier-free file.) |
| PRESENTATIONS: | |
| 13:45 - 14:00 h | GGFC Structure Van Dam T. Download: GGFC Structure (PDF, 2MB, Not barrier-free file.) |
| 14:00 - 14:15 h | Ray-traced troposphere slant delays from numerical weather models as corrections on the observation level - status and outlook Hobiger T., Ichikawa R., Koyama Y., Kondo T. Download: Ray-traced troposphere slant delays from numerical weather models as corrections on the observation level - status and outlook (PDF, 1MB, Not barrier-free file.) |
| 14:15 - 14:30 h | Various methods for the definition of reference pressure Schuh H., Wijaya D., Böhm J. Download: Various methods for the definition of reference pressure (PDF, 961KB, Not barrier-free file.) |
| 14:30 - 14:45 h | Evaluation of Atmospheric Loading Modelling Using GNSS Data Dach R. Böhm J., Steigenberger P., Lutz S., Beutler G. Download: Evaluation of Atmospheric Loading Modelling Using GNSS Data (PDF, 1MB, Not barrier-free file.) |
| 14:45 - 15:00 h | Atmosphere/ocean dealiasing and loading products and some effects (some additional slides of E. Pavlis and T. van Dam) König R., Flechtner F., Raimondo J.C. Download: Atmosphere/ocean dealiasing and loading products and some effects (some additional slides of E. Pavlis and T. van Dam) (PDF, 502KB, Not barrier-free file.) |
| 15:00 - 15:15 h | Non-tidal ocean loading models Van Dam T. Download: Non-tidal ocean loading models (PDF, 2MB, Not barrier-free file.) |
| 15:15 - 15:30 h | Improving geodetic/geophysical models used to estimate EOPs Gross R. Download: Improving geodetic/geophysical models used to estimate EOPs (PDF, 759KB, Not barrier-free file.) |
| PRESENTATIONS: | |
| 15:50 - 16:05 h | SLR Data Analysis Standards Pavlis E. Download: SLR Data Analysis Standards (PDF, 444KB, Not barrier-free file.) |
| 16:05 - 16:20 h | Effect of antenna gravity deformations on VLBI estimates of site positions Sarti P., Abbondanza C., Petrov L., Negusini M. Download: Effect of antenna gravity deformations on VLBI estimates of site positions (PDF, 384KB, Not barrier-free file.) |
| 15:50 - 16:45 h | Measurement Bias Estimation and Modeling - Data QC Luceri C. Download: Measurement Bias Estimation and Modeling - Data QC (PDF, 2MB, Not barrier-free file.) |
| 15:50 - 16:45 h | CoM for Geodetic SLR Targets - Current Accuracy and Prospects Appleby G. Download: CoM for Geodetic SLR Targets - Current Accuracy and Prospects (PDF, 364KB, Not barrier-free file.) |
| Improved Modeling Approaches Towards the mm SLR Pavlis E., Kuzmicz-Cieslak, M., Hinkey, P. Download: Improved Modeling Approaches Towards the mm SLR (PDF, 651KB, Not barrier-free file.) | |
| Terrain Effects in estimates of ATML Van Dam T., Collieux, Altamini, Z., Ray, J. Download: Terrain Effects in estimates of ATML (PDF, 5MB, Not barrier-free file.) |
Saturday - December 12
| Description: | One topic of this session are combination strategies to be used for various combined products of the IERS or GGOS (e.g., including troposphere parameters, quasar coordinates, gravity field coefficients, clocks, _). Important issues are, among others, the weighting of the observations and variance component estimation, constraining of parameters, rank deficiencies, datum definition strategies, combination of UT1 and LOD, nutation offsets and rates (VLBI + satellite techniques), definition of the parameterization for parameters common to more than one technique, standards for a priori values/models to be used for these parameters as well as standards for the time resolution (weekly, daily, sub-daily, ...) and reference epochs of parameters. Combination on the observation level will also be considered. |
| Goals: |
Improve common understanding of combination strategies Understand the singularities and correlations between different parameter groups and their impact Define parameter types to be provided in SINEX and their unique parameterizations and time resolution Concepts for UT1/LOD and nutation offsets/rates combination Steps towards new combined products (daily, weekly combined products; troposphere; _) Benefits of observation level combination |
| INTRODUCTION: | |
| 08:45 - 09:00 h | Objectives and workplan of the IERS WG on combination at the observation level Biancale R. Download: Objectives and workplan of the IERS WG on combination at the observation leve (PDF, 695KB, Not barrier-free file.) |
| 09:00 - 09:15 h | Discussion on the combination strategies at the normal equation level Altamimi Z., Collilieux X., Metivier L. Download: Discussion on the combination strategies at the normal equation level (PDF, 1MB, Not barrier-free file.) |
| PRESENTATIONS: | |
| 09:15 - 09:30 h | Combination strategies for Earth orientation monitoring Gambis D., Richard J.Y., Bizouard C. Download: Combination strategies for Earth orientation monitoring (PDF, 1MB, Not barrier-free file.) |
| 09:30 - 09:45 h | Combination Strategies for ILRS Products Sciarretta C. Download: Combination Strategies for ILRS Products (PDF, 776KB, Not barrier-free file.) |
| 09:45 - 10:00 h | Generation and Comparison of Combined Global Gravity Field Models Förste Ch., Barthelmes F., Biancale R. Download: Generation and Comparison of Combined Global Gravity Field Models (PDF, 3MB, Not barrier-free file.) |
| 10:00 - 10:15 h | Integrated solutions from the GPS-GRACE-CHAMP constellation König R., König D. Download: Integrated solutions from the GPS-GRACE-CHAMP constellation (PDF, 228KB, Not barrier-free file.) |
| PRESENTATIONS: | |
| 10:35 - 10:50 h | Combined Analysis of GNSS and SLR data using satellite co-locations Thaller D., Dach R., Seitz M., Beutler G., Mareyen M., Richter B. Download: Combined Analysis of GNSS and SLR data using satellite co-locations (PDF, 1MB, Not barrier-free file.) |
| 10:50 - 11:05 h | On space ties for some LEOs König R., Michalak G., Neumayer H. K. Download: On space ties for some LEOs (PDF, 327KB, Not barrier-free file.) |
| 11:05 - 11:20 h | Multi-Technique Reprocessing and Combination using "Space-Ties" Springer T. Download: Multi-Technique Reprocessing and Combination using "Space-Ties" (PDF, 188KB, Not barrier-free file.) |
| 11:20 - 11:35 h | Troposphere ties Heinkelmann R., Seitz M., Böhm J., Schuh H. Download: Troposphere ties (PDF, 1MB, Not barrier-free file.) |
| Combination on NEQ / obs. level Seitz, M. Download: Combination on NEQ / obs. level (PDF, 160KB, Not barrier-free file.) |
| Description: | One of the GGOS recommendations (see GGOS2020 book) is the establishment of a global, well-distributed network of core sites, where all the major observation techniques are co-located. Simulations and analyses are therefore important to assess the number of sites necessary, some reasonable locations and what results are to be expected if, e.g., new observation techniques are implemented (kHz-SLR, twin telescopes, combined GPS/GLONASS/GALILEO receivers). |
| Goals: |
Assess network characteristics required to fulfill demanding requirements (e.g., 1 mm reference frame, 0.1 mm/y stability) Identify improvements to be achieved with technological innovations (technique-specific and local ties) |
| 13:30 - 13:45 h | Position Paper "Network Simulation and Analyses" Pavlis E., Pearlman M. Download: Position Paper "Network Simulation and Analyses" (PDF, 1MB, Not barrier-free file.) |
| PRESENTATIONS: | |
| 13:45 - 14:00 h | GGOS Network Scoping Simulations Pavlis E. Download: GGOS Network Scoping Simulations (PDF, 2MB, Not barrier-free file.) |
| 14:00 - 14:15 h | SLR Tracking of GNSS Constellations Pavlis E.. Download: SLR Tracking of GNSS Constellations (PDF, 1MB, Not barrier-free file.) |
| GGOS Network Simulations Download: GGOS Network Simulations (PDF, 15KB, Not barrier-free file.) | |
| Ocean Tide Loading Download: Ocean Tide Loading (PDF, 490KB, Not barrier-free file.) |
| 14:45 - 15:40 h | Additional Discussion of the Sessions, Action Items |
| 15:40 - 16:00 h | Coffee Break |
| 16:00 - 17:00 h | Discussion of how to proceed, Action Items |
| 17:00 - 17:30 h | Summaries of Workshop and Action Items |
| 17:30 h | Closing of Workshop |