The Global Mangrove Watch

Transcription

1 The Global Mangrove Watch Annual mapping of the status and changes of the world s mangroves Ake Rosenqvist and Masanobu Shimada (JAXA/Japan) Richard Lucas (Aberystwyth Univ./U.K.) Lisa Maria Rebelo (IWMI/Lao DPR) 17 th Ramsar STRP, Gland/CH, Feb 25 Mar 1, 2013

2 Ramsar Mangrove Sites Total sites containing mangroves 250 sites Covering 26,426,988 ha Located in all 6 Ramsar regions 72 Contracting Parties Sites designated for the mangroves: 91 sites Covering 9,113,310 ha Located in 5/6 Ramsar regions 23 Contracting Parties

3 Why Earth observation satellites? Earth observation satellites well suited for large-scale mapping of forest and vegetation Using time-series of satelite data, changes in the vegetation cover can be detected and quantified Longer and more frequent time-series help to improve classification accuracy Recent advances in computing power enables processing and storage of the very large data amounts involved

4 The first global effort The first satellite-based, fine resolution global map of mangrove extent generated by the US Geological Survey (USGS) Based on 30m Landsat (optical) data from the years Can be viewed online at

5 Need to map status + changes Changes in mangroves occur fast and updated information about the change status required. For countries participating in REDD+, UNFCCC requires reporting at least on a bi-annual basis. Cloud cover limits optical satellite observations in the tropical zone. Radar satellites can acquire data regardless of clouds, smoke and haze. Consistent satellite data archives. JAXA first space agency to develop global systematic observation strategies: JERS-1: Consistent pantropical mid-1990 s: ALOS: All global land areas >2 times/year ( ) ALOS-2 (launch Nov 2013): Continued global acquisitions

6 International collaborative project initiated in October 2011, as part of JAXA s Kyoto & Carbon (K&C) Initiative. Objectives: Global Mangrove Watch Generation of a baseline map of the global mangrove extent for the year 2010, at a spatial resolution of 25 m. Assessment of decadal changes between 2000 (USGS) and 2010 (JAXA) Undertake annual mapping of changes in the global mangrove areas (ALOS , ALOS )

7 Challenge detecting many different types of changes Losses Acquaculture Oil and gas exploration Urbanisation and infrastructure Logging for firewood and other uses Degradation Others... Gains Natural migration Seaward expansion (natural / antropogenic) Inland expansion (e.g. due to sea level rise and flooding) Large-scale replanting projects

8 Pilot areas for field validation Africa Guinea-Bissau Niger delta Mozambique

9 Pilot areas for field validation Neotropics & N. America Brazil French Guyana Venezuela Colombia Peru Equador Costa Rica Honduras Mexico USA

10 Pilot areas for field validation Asia Oceania Irriwaddi delta Philippnes Sabah, Perak/Malaysia Kalimantan, Sumatra, Irian Jaya/Indonesia QL, NT/Australia

11 Perak, Malaysia: Managed mangrove reserves

12 Perak, Malaysia: Managed mangrove reserves Managed mangrove reserves Changes (pilot results) Matang Mangrove Forest Reserve. Perak, Malaysia Photo: A Syaharuddin K

13 French Guyana: Natural migration

14 French Guyana: Natural migration ( )

15 East Kalimantan: Antropogenic changes USGS 2000 Photo: Hendrarto Photo: Unknown Photo: M Z Rachman ALOS (Radar) 2010 USGS 2000 ALOS 2010

16 R&D: Above-ground biomass and structural classification Hinchbrook Island, QL Australia

17 Validation challenges Validation of a global product an immense undertaking. Pilot Sites cover a limited range of mangrove environments Ramsar parties, national organisations and NGO s are most welcome to contribute with local knowledge and field information for validation.

18 Algorithm development over Pilot Sites Validation of classification results by GMW team members Improvement of classification algorithms and 2 nd round of Pilot Site validations 2014 Release of maps of mangrove extent and changes for the years 1995, 2000 and Time schedule Map updates at an annual basis. New maps to be released within 1 year of the image acquisitions. Continuous validation and improvement of algorithms

19 Conclusions The Global Mangrove Watch is an international collaborative project aiming at producing updated information about the worlds mangrove areas on an annual basis. All mangrove maps will be available free of charge, and within one year after the satellite observations. Wish to increase engagement of national/international organisations and groups Proposed contribution to the Ramsar Global Wetlands Observing System (GWOS)

20 Participating science team organisations Australia (Aberystwyth Univ./UK) Borneo, Irian Jaya (Wageningen Univ./NL) Philippines (Flora & Fauna International, GTZ) Brazil (Brazilian Forest Service, Univ. of Para) Americas and Africa (NASA, Univ. Maryland) East Africa (IWMI) Sumatra (JAXA ) Mekong delta (AGS/USA)