Atlas · Seychelles / Data Quality
DATA

Data Quality

A transparent scorecard for every dataset: valid shapes, provenance coverage, internal consistency, verification and licence clarity. Known issues are listed openly so scientists can judge fitness for use.

Average score
97 / 100
Across all datasets
Features with provenance
30,001 / 30,001
Every feature traced to its source
Geometries repaired
1
Invalid shapes fixed on import
Datasets with a stated licence
9 / 13
Others held for internal use

Scorecard

Score = valid geometry 30% · provenance 25% · no flagged values 15% · unique IDs 15% · verification 10% · licence 5%

DatasetScoreFeaturesProvenanceNo geometryRepairedDuplicate IDsFlaggedRejected valuesVerifiedLicence
Global Mangrove Watch v4.1: mangrove exten...
100/100
72172100000 stated
Global Mangrove Watch v4.1: mangrove exten...
100/100
74174100000 stated
Global Mangrove Watch v4.1: mangrove exten...
100/100
70370300000 stated
Global Mangrove Watch v4.1: mangrove exten...
100/100
64864800000 stated
Global Mangrove Watch v4.1: mangrove exten...
100/100
64564500000 stated
Global Mangrove Watch v4.1: mangrove exten...
100/100
64564500000 stated
Global Mangrove Watch v4.1: mangrove exten...
100/100
67267200000 stated
polygons
95/100
111100000 not stated
Fibre Cable Landing Stations
95/100
12612600000 not stated
Small airport
95/100
1,9791,97900000 not stated
Irrigated Areas
95/100
23,09523,09501000 not stated
Seagrass (UNEP-WCMC): Seychelles
90/100
141400000 —stated
Community and nature projects (UNDP): Seyc...
90/100
1100000 —stated

Known issues & assumptions

Stated plainly so nobody is surprised later
Field-plot canopy cover above 100%
One or more plots report a cover value over 100% (up to 6,070). That cannot be a percentage, so Atlas rejects the value, keeps the original and flags the plot.
Field-survey photos are not in the archive yet
The 139 plot photographs are not part of the archive yet. Their original links are kept, so the photos can be added when the publisher shares the image files.
No licence stated by the publisher
Atlas holds an archival copy for scientific and internal use and asks users to cite WWF Kenya, KMFRI and KFS. We are seeking written permission for wider redistribution.
Degree-based length and area fields excluded
Several source fields (st_area, st_length, Shape_Leng) are in degrees or square degrees, not metres or hectares. Atlas excludes them and recomputes from geometry.
Turtle timestamps assumed UTC
The source gives times without a time zone. UTC is assumed (standard for satellite telemetry) and the assumption is recorded with the data.
Unpopulated historic-area fields
The mangrove block layers carry 1990–2018 area fields that are all zero. They are treated as empty placeholders, not measurements.
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