River and Lake Level data from Radar Altimetry in Support of the Tiger Initiative

Transcription

1 River and Lake Level data from Radar Altimetry in Support of the Tiger Initiative Benveniste, J 1 ; Berry,, P 2 ; Milagro-Perez, M.P 3 ;; Serpe, D 3 ; 1 ESA; 2 De Montfort Univ.; (1) ESRIN, European Space Agency (jerome.benveniste@esa.int) (2) EAPRS Lab, De Montfort University (pamb@dmu.ac.uk) (3) Serco support to ESA-ESRIN Hydrospace07, WMO, Geneva, Nov 2007

2 A web-based pilot demonstration makes Envisat-derived radar altimetry measurements of the inland surface water level freely available in near-real time, globally, therefore supporting the TIGER Initiative to supply EO data to Africa for water resource management. Envisat's Radar Altimeter-2 data are processed in Near real time by a sophisticated algorithm developed by De Montfort University (DMU) in Leicester, UK, under ESA contract. Until now reliable information has been difficult to access because of the high cost in equipment, manpower and communications, and because it still is problematical to obtain hydrological data from many countries, despite efforts from international organizations, agencies and forums. The near-real-time processing system identifies that part of each surface echo originating from inland water, enabling measurement of much smaller targets, with an increased accuracy, than has previously been possible. With the recent improvement of the data processing in real-time of the precise orbit determination system aboard the satellite, DORIS, the system can be pushed further to deliver water levels in less than six hours, in order to better satisfy the actual needs of users. Supported by the European Space Agency's Earth Observation Data User Element, the River and Lake project is aimed at developing, demonstrating and assessing an information service based on inland water altimetry, globally and both in near real time and for analysing long time series. The data retrieved over Africa is supporting ESA's TIGER initiative. Following the 2002 Johannesburg World Summit on Sustainable Development, the European Space Agency has launched the TIGER Initiative - focusing on the use of space technology for water resource management in Africa and providing concrete actions to match the Resolutions. A brief description of the initiative and its present status will be presented. 2

3 THE RIVER AND LAKE PROJECT Objective of this research and development project is: To build and validate a system that retrieves inland water heights from ERS and ENVISAT, globally. To drastically increase the number of measured inland water bodies, by improving the data processing. To Provide Near Real Time Data Without time for a posteriori verification for many lakes and rivers globally A Challenge!! 3

4 THE RIVER AND LAKE PROJECT This research and development project is aimed at improving the river and lake level estimation by Radar Altimetry and demonstrating the accuracy and robustness through a demonstration pilot. When it is demonstrated mature and the Users are satisfied with the data products it will become operational. An important aspect for this, is local verification of the accuracy of the radar altimeter data. Gather feedback from Users on accuracy, timeliness, location, usefulness 4

5 How many virtual limnographs can satellite altimetry correspond to? Order of 300 over central Africa. Not all go through quality threshold tests all the time (due to environmental variations perturbating the radar echoes). Accuracy 5~20 cm for the best measurements, depends on the water body dimension and environment. 5

6 THE RIVER AND LAKE MASK OVER AFRICA Red indicates area where NRT products are currently generated Blue indicates area where products may be generated in the future. 6

7 THE RIVER AND LAKE PROJECT VALIDATION OVER AMAZONIA / GAUGE STATION Note that EnviSat data continue after the gauge records stop at this location. Rio Negro 7

8 THE RIVER AND LAKE PROJECT VALIDATION OVER AMAZONIA / GAUGE STATION Rio Amazonas Here, a break in gauge records is bridged by the EnviSat records 8

9 NEAR REAL TIME DEMONSTRATION PILOT Radar Altimeter waveforms and geophysical corrections are fetched directly from the Envisat ground segment An ad hoc USO correction is computed and applied The near real time River&Lake processor is run as soon as the data is received and corrected The River&Lake for Hydrology (RLH) output product is stored in the web site The longest lag is the availability of the DORIS orbit (3~4 days) This will improve to 3 hours when the DORIS Navigator orbit is fully processed in real time 9

10 Near-real Time Products: NRT system demo has started on October 2005 It was interrupted in march 06 until now due to the USO problem on RA-2 Data within 4 days Very good agreement indeed with SGDR data, meaning that the NRT heights are accurate within a few cm, compared to the final precision product Exciting possibility to get even faster delivery, upgrading to use product generated within 24 hours Output products will be assessed and mask upgraded to include additional sites periodically 1 0

11 River and Lake Products Website 1 1

12 SAMPLE PAGE FOR HISTORICAL PRODUCTS Each sample page has the same layout: Info Time series A typical Time Series Products download 1 2

13 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS THE NEAR REAL TIME PRODUCTS ARE MADE AVAILABLE VIA THE RIVER AND LAKE WEB SITE 1 3

14 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS THE NEAR REAL TIME PRODUCTS ARE MADE AVAILABLE VIA THE RIVER AND LAKE WEB SITE 1 4

15 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS Lake Debo 1 5

16 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS Location of data of 2 December 1 6

17 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS Aswan, Bangweulu, Edward, Kainji, Kariba, Kivu, Kyoga, Malawi, Mweru, Niger, Tanganyika, Turkana, Victoria, Volta, Zambezi, others All Data generated in Near Real Time since the 25 th October 2005 Location of data since 25 October 1 7

18 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS AFRICA - Lake Volta

19 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS AFRICA - Lake Rudolph

20 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS AFRICA MASK FOR LATIN AMERICA

21 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS AMAZON (52.7 W)

22 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS AMAZON (56.71 W)

23 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS AMAZON (58.02 W)

24 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS ORINOCO

25 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS MASK FOR ASIA

26 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS LIAO HE RIVER (China) (from Envisat)

27 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS QINGHAI HU LAKE (China) (from Envisat)

28 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS Brahmaputra RIVER (Bangladesh) 2 8

29 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS Ganges RIVER (India) 2 9

30 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS Mekong RIVER (Vietnam) 3 0

31 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS THE MASK CAN BE ENHANCED TO ATTEMPT RETRIEVAL OVER YOUR PROJECT S AREA 3 1

32 DEMONSTRATION PILOT DATA DISSEMINATION THE NEAR REAL TIME ARE MADE AVAILABLE VIA THE RIVER AND LAKE WEB SITE ASK FOR HISTORICAL DATA IN YOUR AREA 3 2

33 River and Lake Products Website 3 3

34 PRODUCTS FORMAT XML XSL (Extensible Stylesheet Language) HTML 3 4

35 SAMPLE PAGE Each sample page has the same layout: Info Time series A typical Time Series Products download 3 5

36 PRODUCTS -TOOLS RLA read/write C library RLA/RLH read/write/plot library RLH Viewer (demo) C Library IDL Library Java Executable 3 6

37 PRODUCT - RLH VIEWER TOOL RLH Viewer Screenshot - Platform independent (JAVA) - More than one RLH product plots - Interactive plots (i.e. zoom feature) - PNG export 3 7

38 PRODUCT - RLH VIEWER TOOL RLH Viewer allows three kind of plots: scatter, line, area Zoom feature 3 8

39 PRODUCTS - IDL Tool: File selection Plot RLH product: Plot RLA product: 3 9

40 INFORMATION - USERS 4 0

41 INFORMATION - HISTORICAL REVIEW 4 1

42 INFORMATION - NEWS AND EVENTS 4 2

43 INFORMATION - DOCUMENTS 4 3

44 INFORMATION - DOCUMENTS 4 4

45 INFORMATION - PUBLICATIONS 4 5

46 INFORMATION - PROJECT MEMBERS Contact us: rl.info@plod.esrin.esa.it 4 6

47 SAMPLE PAGE FOR NEAR-REAL TIME PRODUCTS SIGN UP IN THE DISTRIBUTION LIST OF THE NRT PILOT DEMO VIA THE RIVER AND LAKE WEB SITE or write at or 4 7

48 TIGER Objectives Support improved water governance and decision-making: (at regional, national and local scales) by using space-based information to provide accurate and timely geoinformation for the integrated water resource management process. Contributing to enhance institutional, human and technical capacity: support the consolidation of a critical mass of technical centres in Africa with the skills and capabilities to exploit the advantages of EO technology in order to improve water research and knowledge in Africa as well as to derive water-relevant geo-information. Fostering sustainability: Development of strategy for strengthening and sustaining EO-supported IWRM information and decision-support systems in the long term. 4 8

49 The TIGER Partnership TIGER is an International initiative; The African component of TIGER involve more than 200 African experts that actively participate in TIGER research and technology transfer projects: National water and basin authorities; Universities; National technical centres; Regional technical centres; African Ministerial Council On Water (AMCOW) endorsed the initiative in Key African and Int. Organisations: AMCOW, AfDB, DWAFs (e.g., Republic of South Africa); CEOS (e.g., ESA & CSA have funded the initial set of TIGER projects); UN Africa Water Group: UN-ECA, UNESCO-IHP; 4 9

50 TIGER Lines of Action & Development Model Improving Access to EO Data Capacity Building and Training TIGER Water Information & Knowledge Network Developing Water Information Systems & Services Research stage TIGER Pilot Projects Pre-operational Stage North-South Tec. Transfer Projects Operation Stage African Water Observation System 5 0

51 Capacity Building More than 20 Training Sessions: Oriented to users (e.g., water authorities): Organized by different TIGER projects (e.g., AQUIFER, GlobWetlands, etc ); Oriented to research and technical centers: e.g., Organized directly by ESA, UNESCO on specific remote-sensing aspects for water resources. Dedicated Training Tool Kits: including general courses on remote-sensing, SAR, EO applications and free Software tools to support PIs. TIGER Capacity Building Facility (leaded by ITC) was launched in September 2006: Dedicated courses (at ITC and in Africa); Tailored technical support and research stages. E-learning; 5 1

52 Date Organiser Topic Location Nov-06 GAF, in the framework of the AQUIFER project Evapotranspiration and water balance Niger Nov-06 GAF, in the framework of the AQUIFER project Open Water Mapping and Monitoring Niger Nov-06 ESA & UNESCO Optical Remote Sensing for water resources South Africa Sep-06 GAF, in the framework of the AQUIFER project Open Water mapping and monitoring Nigeria Jul-06 Viasat Geo-Technologies, in the framework of the StereoSat Africa project. Training on visualization and data acquisition using stereoscopy Burkina Faso Jul-06 ESA Microwave Remote Sensing for water resources Italy Jun-06 Vexcel Canada, in the framework of the ARBRE project Training on basic radar remote sensing and EO tools Burkina Faso May 06 IES Canada, in the framework of the Morocco IDAS Training on the IDAS. Canada Apr-06 Wetlands International and Vexcel, in the framework of the GLOBWETLAND project Wetland managers training course Kenya April-06 Hatfield, in the framework of the Nile RAK project Training-of-the-Trainers course on the Nile RAK Environmental and EO material Egypt, Kenya, Ethiopia, Uganda April-06 Hatfield, in the framework of the Nile RAK project Remote Sensing for Flood Mapping Ethiopia April-06 Hatfield, in the framework of the Nile RAK project Nile RAK Map Production Sudan Jan-06 Noetix in the framework of the Mosquito habitats project Basic remote sensing followed by use in health applications South Africa Jul-05 Jena Optronik in the framework of the EPIDEMIO project Exploitation of EPIDEMIO products France Sep-05 Jena Optronik in the framework of the EPIDEMIO project Exploitation of EPIDEMIO products Switzerland Oct-05 Jena Optronik in the framework of the EPIDEMIO project Exploitation of EPIDEMIO products Madagascar Oct-05 ESA Introduction to optical and microwave Remote Sensing Italy Oct-05 UNESCO Basic Remote Sensing for water resources South Africa Nov-05 Jena Optronik in the framework of the EPIDEMIO project Exploitation of EPIDEMIO products Niger 5 2

53 Water Information Services & Systems Research Stage Pre-operational Stage Operational Stage 5 3

54 Transition to Operational Phase A initial portfolio of projects are under development in collaboration with the AfDB and other donors; A first project has been approved by AfDB for funding (GEO- Aquifer, follow-up of the ESA AQUIFER project); Project GEO-AQUIFER Lake Chad Lake Victoria Zambezi River Executing Agency OSS Lake Chad Basin Co. Lake Victoria Basin Co. Zambia Water Auth. Status proposal Funded with 500,000 Euros Under evaluation Concept definition Concept definition 5 4

55 Closing the first Implementation period Major Achievements : Solid partnership with key African players (e.g., AfDB, AMCOW, DWAFs.), UN Water African Group (UNESCO, UN-ECA) and Space Agencies (e.g., ESA, CSA); Consolidation of management structure (Steering Committee, TIGER Coordination Office); Consolidation of African network of beneficiaries and partners involving more than 100 institutions (Universities, Ministries of Water, technical centres); Contribute to advance in African-lead scientific activities related to the use of EO for water knowledge and management (supported by a strong CB component); Develop a solid portfolio of user-driven service cases demonstrating value of EObased information systems for and with African water authorities; Set up a development model lead by African institutions in partnership with donors facilitating the transferring to operations of prototype services (e.g., GEO- AQUIFER); 5 5

56 Closing the first Implementation period Complete the existing TIGER projects: 1) Research component and 2) Development and demonstration component; Complete the Capacity Building and Training Plan (Capacity Building Facility, publications, training sessions); Complete the launch of an initial set of projects leaded by African institutions to move from a preoperational to an operational stage (e.g., GEO-Aquifer, TIGER-Lake Chad, ); Consultation process with partners and stakeholders to prepare the TIGER next implementation period; 5 6