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DATASET

Global Mangrove Watch v4.1: mangrove extent 1996, The Gambia

Mangrove extent for 1996 from the Global Mangrove Watch v4.1 annual time series (1985-2025, Landsat/Sentinel and SAR based), as polygons labelled with their country: The Gambia. Each polygon is a contiguous mangrove area; the source holds one attribute (PXLVAL = 1, mangrove).

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CSV GeoJSON
Features
3,464
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 v4.1
Global Mangrove Watch (Aberystwyth University, soloEO, Wetlands International, UNEP-WCMC, JAXA)
Source layer
gmw_v4112_1996_mng_ext_cntry_info_vec (EPSG:4326)
Module / ecosystem
MANGROVES · Mangroves
Licence
—
Coordinate system
Stored as EPSG:4326 (WGS 84). Source native: n/a
Records archived
3,464 (matches the source's own count)

How to cite

WWF Kenya, KMFRI, KFS (2026). Global Mangrove Watch v4.1: mangrove extent 1996, The Gambia. Archived copy held by Atlas Blue Carbon Intelligence (snapshot n/a; SHA-256 7de8568491ecf1eb…). Accessed via https://atlas.twende.green/datasets/gmw-v4-1996-gm.

Feature classes

ClassFeatures
mangrove_extent_19963,464

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
cntry_iso3classcountry label (cntry_iso3)——used to assign each polygon to its country
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
year3,464
area_ha_geodesic3,464
perimeter_m3,464

Checked against the geometry

Source value ÷ the same quantity computed from the stored shape

No unit checks apply

Archive & integrity

Snapshot
n/a
Format
GeoPackage (gzip), WGS 84
Archive checksum
7de8568491ecf1eb2e494051244fb8dceceeb1df8ec97fe4812a0d48161a823a
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
#377completed2026-10-13 01:39:03.045764+003,4640
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