HMA-FO Task 1 EOP Metadata Darmstadt September 2009 Frédéric Houbie, ERDAS

Agenda Introduction to HMA-FO Task 1 objectives Improving the current specifications using MDA, O&M, … Output of HMA-T : management of VGT products Presentation from STFC Presentation from EUMETSAT/CNES/CLS Presentation from GECA (given by S. Smolders) OGC CR to fulfill the HMA-FO requirements Slide 2

Structure Consortium structure Proposed Work Plan Proposed Schedule EO Product Metadata Structure Proposed Extensions Proposed approach OGC Process Validation of the approach Proposed Schedule © ERDAS, Inc. A Hexagon Company. All Rights Reserved

Consortium structure Consortium leader OGC Standardisation process Test suite New schemas for systematic & synthesis products Implementation in HMA Skeleteon & SSE client New schemas for radar altimeter & limb looking products © ERDAS, Inc. A Hexagon Company. All Rights Reserved

Proposed work plan WP1000 Project Management WP2000 Analysis of the extensions and update of EO GML T2100 Document Update & OGC Process T2200 Synthesis and Systematic products T2300 Radar altimeter, limb looking products & new schemas WP3000 Tests T3100 SSE T3200 CITE WP 4000 OGC Process © ERDAS, Inc. A Hexagon Company. All Rights Reserved

Current EO Product Metadata stack © ERDAS, Inc. A Hexagon Company. All Rights Reserved

Proposed extensions Radar Altimeter Limb-looking products Systematic and Synthesis Products © ERDAS, Inc. A Hexagon Company. All Rights Reserved

Radar Altimeter No particular problem to handle this new model in the current EOP basic structure tree In principle, the altimeter's operation is straightforward (Figure 3): timed radar pulses are used to measure the distance, h, between the satellite platform and the instantaneous sea surface. With knowledge both of the satellite’s orbit relative to the earth's reference ellipsoid, O, and the geoid, N, the sea-surface height (SSH) relative to the geoid is then known:  = O-N-h To be useful, the SSH should be determined to O(cm) accuracy, placing severe requirements on geoid knowledge, the altimetric radar, and knowledge of the satellite’s orbit. To achieve sufficient altimeter accuracy, several corrections must be made to the measured SSH. Delays in the altimeter signal are caused both by tropospheric water vapour and ionospheric free-electron content, both of which vary in space and time and must be corrected for. The radar pulse transmitted from the altimeter has a “footprint” diameter of several kilometres. Over this area, the reflected signal is affected by the sea-state: maximum energy in the return pulse generally does not correspond to reflection from the mean sea-surface. These so-called electromagnetic bias effects contribute significant errors that are difficult to correct. Local atmospheric pressure loading on the ocean produces changes in sea-level of the order of one cm per millibar. This “inverse barometer” effect must be compensated accordingly. Finally, the ocean's tides are generally ignored for oceanographic problems, so must be modelled and removed from the measured SSH signal. © ERDAS, Inc. A Hexagon Company. All Rights Reserved

Limb looking products Limb viewing instruments view the limb of the atmosphere – this could be sideways-viewing, backwards-viewing or a combination. Issue : geolocation information, currently extend is limited by schematron rule and only in WGS84 Will have to extend the geometry information to 3D and other CRS © ERDAS, Inc. A Hexagon Company. All Rights Reserved

Systematic and Synthesis Products Combined EO products (ex VGT started in HMA-T2) Already a set of comments in the OGC SWG Extension of CompositeType Improvement of processingInformation Linking between EO Products to be analyzed and improved © ERDAS, Inc. A Hexagon Company. All Rights Reserved

Proposed approach Objective = describing and cataloguing the new products Analyze the data Extract important metadata Create new product type metadata and/or extend existing levels (using new methods like MDA, O&M, ...) Extend/Improve the current EO EP to facilitate storage and discovery of metadata © ERDAS, Inc. A Hexagon Company. All Rights Reserved

OGC Process Continue the current process of standardisation of EO GML and its cataloguing model, EO EP Important to bring domain people in the discussion (was lacking in HMA-T).  Open a Public OGC Wiki for EO GML & EP discussion (like in METEO DWG), without OGC membership required. Of course only OGC members will vote. Obtain quickly a draft updated document (KO + 8 at the latest) to allow validation by CITE and SSE that it fulfills the requirements, then start the standardisation process of vote with the argument that it is implemented and functional. © ERDAS, Inc. A Hexagon Company. All Rights Reserved

Validation of the approach SSE / HMA-Skeleton New request/response to validate Integration in SSE workflow CITE tests Update of existing CITE scripts Creation of new ones for new products type Update existing schematron files © ERDAS, Inc. A Hexagon Company. All Rights Reserved

Project Schedule Slide 14