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DATASET

Global Mangrove Watch v4.1: mangrove extent 2015, Tanzania

Mangrove extent for 2015 from the Global Mangrove Watch v4.1 annual time series (1985-2025, Landsat/Sentinel and SAR based), as polygons labelled with their country: Tanzania. Each polygon is a contiguous mangrove area; the source holds one attribute (PXLVAL = 1, mangrove).

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CSV GeoJSON
Features
6,895
mangrove_extent_2015
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_2015_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
6,895 (matches the source's own count)

How to cite

WWF Kenya, KMFRI, KFS (2026). Global Mangrove Watch v4.1: mangrove extent 2015, Tanzania. Archived copy held by Atlas Blue Carbon Intelligence (snapshot n/a; SHA-256 98383a46ff8cdf0f…). Accessed via https://atlas.twende.green/datasets/gmw-v4-2015-tz.

Feature classes

ClassFeatures
mangrove_extent_20156,895

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
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
GeoPackage (gzip), WGS 84
Archive checksum
98383a46ff8cdf0f41f40f803aa3955711d3bb40fc39c4a905cb2a435811c289
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
#268completed2026-10-13 01:31:53.830005+006,8950
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