Atlas · Sierra Leone / Intelligence Centre
INTELLIGENCE CENTRE · SIERRA LEONE

Nature and climate intelligence, from the data to the decision

216,141 mapped features and 37,971 observations from 25 datasets, harmonised to one set of units, with every number traceable to its source.

Explore Atlas by theme

Mangroves are where Atlas starts. The same platform holds the pressures, places and projects around them for Sierra Leone.

All themes
Mapped mangrove
149,725 ha
8,520 polygons · 2020
Change since 1996
−10,428 ha
−6.8% net, 1996–2025
Datasets
25
216,141 features
Data quality score
97 / 100
55,235 geometries repaired
Provenance coverage
216,141
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
8,520
Median / mean patch
0.177 / 17.57 ha
Effective mesh size
2,890.8 ha
Largest patch index
5.9% of area
Patch-size exponent α
1.50
Species & formations

Spatial clustering

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

Moran’s I
0.245
z-score
7.4

Mangrove area is significantly clustered. 41 hot-spot and 28 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
13 of 9 themes have no data yet
Atlas holds no records for: Seagrass, Salt Marsh, Coastal Forests, Blue Carbon, Restoration Sites, Protected Areas & Landscapes, Land Use & Land Cover, People & Settlemen...
HighGovernance
Licence terms to be confirmed for 11 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 152,505 ha of mangrove in Sierra Leone in 1996 and 142,077 ha in 2025: a net loss of 10,428 ha (-6.8%), about 360 ha per year. This is the net...
MediumFragmentation
Most polygons are very small, but most area sits in large stands
42.8% of the 8,520 mapped polygons are under 0.1 ha, yet patches of 10 ha or more hold 96.8% of all mangrove area. Management and monitoring effort should focus on the la...
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 “Sierra Leone mangrove intelligence brief — 14 October 2026”

Datasets in Atlas

25 datasets from 5 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 · 62,585 features

Global Mangrove Watch v4.1

Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA) · 7 datasets · 58,152 features

WWF Kenya Sources: GIS Centre of Excellence

WWF Kenya · 11 datasets · 95,392 features

Fibre Cable Landing Stations
Roads, Rail & Infrastructure · v1
126
features
Rivers
Water & Catchments · v1
228
features
Power Plants (Power output MW)
Roads, Rail & Infrastructure · v1
642
features
Small airport
Roads, Rail & Infrastructure · v1
1,979
features
Dams
Roads, Rail & Infrastructure · v1
2,586
features
Districts
Boundaries & Reference · v1
6,099
features
World Database on Protected Areas
Biodiversity · v1
7,438
features
Electricity Transmission Network
Roads, Rail & Infrastructure · v1
9,759
features

Berkeley Voluntary Registry Offsets Database (v2026-08)

Berkeley Carbon Trading Project, University of California, Berkeley · 1 datasets · 2 features

Carbon projects: Sierra Leone
Carbon Projects · v1
2
features

UNDP project data (IATI Registry)

United Nations Development Programme (UNDP) · 1 datasets · 10 features

Community and nature projects (UNDP): Sierra Leone
Community Projects · v1
10
features

Data health

The ten lowest-scoring datasets and the local archive

Quality scorecard

Geometry, provenance, flags, duplicates, verification and licence

Carbon projects: Sierra Leone
90
Community and nature projects (UNDP): Sierra Leone
90
Fibre Cable Landing Stations
95
Rivers
95
Power Plants (Power output MW)
95
Small airport
95
Dams
95
Districts
95
World Database on Protected Areas
95
Electricity Transmission Network
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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