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DATASET

Global Mangrove Watch: mangrove extent 1996, Guinea

Mangrove extent for 1996 mapped from JAXA L-band SAR (25 m pixels, vectorised) by Global Mangrove Watch v3.0, clipped to Guinea. Each polygon is a contiguous mangrove area; the source holds one attribute (PXLVAL = 1, mangrove).

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CSV GeoJSON
Features
10,056
mangrove_extent_1996
Observations
0
Linked measurements
Quality score
100 / 100
Completeness · provenance · checks
Version
v1
Imported 2026-10-13

About this dataset

Source
Global Mangrove Watch v3.0
Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA)
Source layer
gmw_v3_1996_vec (EPSG:4326)
Module / ecosystem
MANGROVES · Mangroves
Licence
—
Coordinate system
Stored as EPSG:4326 (WGS 84). Source native: n/a
Records archived
10,056 (matches the source's own count)

How to cite

WWF Kenya, KMFRI, KFS (2026). Global Mangrove Watch: mangrove extent 1996, Guinea. Archived copy held by Atlas Blue Carbon Intelligence (snapshot n/a; SHA-256 250b9102fa388283…). Accessed via https://atlas.twende.green/datasets/gmw-v3-1996-gn.

Feature classes

ClassFeatures
mangrove_extent_199610,056

Measurements recorded

Geometry-only dataset
No separate measurements; attributes are shown in the data table.

Unit harmonisation applied to this dataset

Every number in Atlas is stored in one canonical unit; the original value and unit are always kept

Source fieldMeasureSource unitAtlas unitFactorTreatment
PXLVALclasspixel value (1 = mangrove)——kept in source_records; class is always mangrove
geometryarea / perimeterEPSG:4326 degreesha / m—geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS

Attributes stored per feature

How many features carry each attribute (first 20,000)

AttributeFeatures
year6,667
perimeter_m6,667
area_ha_geodesic6,666

Checked against the geometry

Source value ÷ the same quantity computed from the stored shape

No unit checks apply

Archive & integrity

Snapshot
n/a
Format
ESRI Shapefile (zip), WGS 84
Archive checksum
250b9102fa388283efcd56faef74a9c4de7ade6fa6ec20c57c63e7f0948cd56d
Atlas serves this dataset from its own archived copy. Nothing is requested from the publisher when you view or download it.

Verification against the raw archive

Record counts match the source
Imported record count equals the source's own count; per-record cross-check recorded in the import run.

Import history

RunStatusStartedRecordsRepaired geometries
#66completed2026-10-13 00:11:50.276906+0010,0560
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