Atlas · Madagascar / Intelligence Centre
INTELLIGENCE CENTRE · MADAGASCAR

Nature and climate intelligence, from the data to the decision

319,264 mapped features and 38,648 observations from 44 datasets, harmonised to one set of units, with every number traceable to its source.

Mapped mangrove
261,598 ha
26,508 polygons · 2020
Change since 1996
−19,961 ha
−6.9% net, 1996–2025
Datasets
44
319,264 features
Data quality score
96 / 100
55,235 geometries repaired
Provenance coverage
319,264
Records traceable to source

The seascape at a glance

Live from Atlas’ own database

Mangrove formations map

Pan and zoom; click a polygon for its area and source

Area by formation

Share of mapped hectares

Mangrove · 100.0%

Landscape science

Computed, reproducible measures (see Methodologies)

Fragmentation

How broken up is the canopy?

Patches
26,508
Median / mean patch
0.172 / 9.87 ha
Effective mesh size
956.6 ha
Largest patch index
1.9% of area
Patch-size exponent α
1.54
Species & formations

Spatial clustering

Moran’s I and Getis-Ord Gi* on a 5 km grid

Moran’s I
0.141
z-score
6.5

Mangrove area is significantly clustered. 78 hot-spot and 31 cold-spot cells.

Spatial analysis

Mangrove area by year

Global Mangrove Watch, hectares

Themes

Where Atlas has data, and where it is still empty

What the analysis says

Top recommendations from the intelligence engine
HighData_gap
10 of 9 themes have no data yet
Atlas holds no records for: Coastal Forests, Blue Carbon, Restoration Sites, Land Use & Land Cover, People & Settlements, Wildlife & Habitats, Fire & Climate, Farming & L...
HighGovernance
Licence terms to be confirmed for 28 datasets
Licence terms are being confirmed with the publisher. Atlas holds the data for scientific and internal use and shows the original attribution, but cannot grant bulk redis...
HighChange
Net loss of mangrove since 1996
Global Mangrove Watch maps 287,462 ha of mangrove in Madagascar in 1996 and 267,501 ha in 2025: a net loss of 19,961 ha (-6.9%), about 688 ha per year. This is the net ba...
MediumFragmentation
Most polygons are very small, but most area sits in large stands
40.9% of the 26,508 mapped polygons are under 0.1 ha, yet patches of 10 ha or more hold 93.6% of all mangrove area. Management and monitoring effort should focus on the l...
All recommendations

Ask the analyst

Plain-English questions, answered with real calculations

See how it works
Latest brief: 4 computed insights: 3 need attention, 1 are worth acting on. Read “Madagascar mangrove intelligence brief — 14 October 2026”

Datasets in Atlas

44 datasets from 6 sources — grouped by where they come from

Global Mangrove Watch v3.0

Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA) · 5 datasets · 74,709 features

Global Mangrove Watch v4.1

Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA) · 7 datasets · 146,724 features

WWF Kenya Sources: GIS Centre of Excellence

WWF Kenya · 28 datasets · 97,781 features

Mahafaly
Roads, Rail & Infrastructure · v1
1
features
Madagascar
Protected Areas & Landscapes · v1
1
features
Africa_Water_Towers
Water & Catchments · v1
7
features
EAC_MZQ_ForestProgramme_Countries
Protected Areas & Landscapes · v1
8
features
flr_9
Protected Areas & Landscapes · v1
9
features
polygons
Protected Areas & Landscapes · v1
11
features
Biodiversity Hotspots
Biodiversity · v1
12
features
FLRi Countries
Protected Areas & Landscapes · v1
13
features

Berkeley Voluntary Registry Offsets Database (v2026-08)

Berkeley Carbon Trading Project, University of California, Berkeley · 1 datasets · 8 features

Carbon projects: Madagascar
Carbon Projects · v1
8
features

UNEP-WCMC global seagrass and saltmarsh layers

UN Environment Programme World Conservation Monitoring Centre (UNEP-WCMC) and Short FT · 2 datasets · 29 features

Seagrass (UNEP-WCMC): Madagascar
Seagrass · v1
25
features
Salt marsh (UNEP-WCMC): Madagascar
Salt Marsh · v1
4
features

UNDP project data (IATI Registry)

United Nations Development Programme (UNDP) · 1 datasets · 13 features

Community and nature projects (UNDP): Madagascar
Community Projects · v1
13
features

Data health

The ten lowest-scoring datasets and the local archive

Quality scorecard

Geometry, provenance, flags, duplicates, verification and licence

Carbon projects: Madagascar
90
Seagrass (UNEP-WCMC): Madagascar
90
Salt marsh (UNEP-WCMC): Madagascar
90
Community and nature projects (UNDP): Madagascar
90
Mahafaly
95
Madagascar
95
Africa_Water_Towers
95
EAC_MZQ_ForestProgramme_Countries
95
flr_9
95
polygons
95

Local archive

Atlas runs from its own copy

Last import
14 Oct 2026, 15:38
Snapshots kept
1
Units
ha · m · % · UTC · WGS 84
Sources online?
Not needed. Atlas serves everything from its own database.
Full data-quality report
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