Global Mangrove Watch

1. Updates

Nov. 05, 2021
Global Mangrove Watch (version 2.0) raster dataset was released.

2. Overview

The Global Mangrove Watch (GMW) was established in 2011 under JAXA’s Kyoto & Carbon Initiative. It is an international collaboration led by Aberystwyth University, solo Earth Observation, Wetlands International and The Nature Conservancy.

The Global Mangrove Watch (GMW) dataset (version 2.0) provides maps of estimated global extent and changes of mangrove forests for seven annual epochs between 1996 and 2016. Annual updates from 2017 and onwards are scheduled for public release in 2022.
Global Mangrove Watch

3. Dataset description

Dataset name: Global Mangrove Watch, version 2.0
Content: Mangrove geographical extent for the years 1996, 2007, 2008, 2009, 2010, 2015 and 2016
Pixel spacing: 25 m (0.000222 degrees)
Data type: Raster (BYTE)
Pixel values: DN=1: mangroves; DN=0: non-mangrove
Format: GeoTIFF
Projection: Geographic coordinates (WGS 84, EPSG=4326)

4. Methodology

The GMW mangrove maps were derived from a combination of L-band SAR (JERS-1 SAR, ALOS PALSAR and ALOS-2 PALSAR-2) and optical (Landsat) satellite data. The methodology used to derive the maps are described in:

Bunting P., Rosenqvist A., Lucas R., Rebelo L-M., Hilarides L., Thomas N., Hardy A., Itoh T., Shimada M. and Finlayson C.M. (2018). “The Global Mangrove Watch – a New 2010 Global Baseline of Mangrove Extent.” Remote Sensing 2018, 10, 1669,

5. Download

Please register your information from following URL to download the dataset. It is required your email address.

This is temporally registration (especially please check your email address again) and will send email you to accept your registration request. After the confirmation of your request, the download information will send by email.
The dataset download site is

If you forget your password, please register again.
Recommend to use Microsoft Edge, Google Chrome, Mozilla Firefox, Apple Safari.
Depending on the time, it may take time to display the page or download the dataset.

6. Note for data use

The dataset is available for free public use under a Creative Commons license, Attribution 4.0 International (CC BY 4.0)

Users should keep in mind that the GMW dataset is a global-scale dataset, generated with a single methodology applied over all regions. As such, the accuracy of the map may vary between locations and with scale.

7. Contacts and further information

The ALOS-2/ALOS Science Project

Earth Observation Research Center (EORC)

Japan Aerospace Exploration Agency (JAXA)


Dr. Ake Rosenqvist, GMW and K&C Science Coordinator

solo Earth Observation (soloEO)

Tokyo, Japan


See the K&C Global Mangrove Watch and Global Mangrove Watch Platform for further information.