DATA
Data Dictionary & Units
One set of units for the whole platform. Whatever unit a source uses, Atlas converts it on import and keeps the original, so numbers from different sources can be compared directly.
| Measure | Atlas unit |
| Area | ha hectare (ha) |
| Length | m metre (m) |
| Distance | km kilometre (km) |
| Carbon Stock Density | tC/ha tonnes of carbon per hectare |
| Co2e | tCO2e tonnes CO2-equivalent |
| Percent | % percent (0-100) |
| Time | ISO-8601 UTC timestamp (UTC) |
| Crs | EPSG:4326 WGS 84 geographic coordinates (decimal degrees) |
Conversions Atlas applies
| From | To | Rule |
| square metres (m²) | hectares | ÷ 10,000 |
| square kilometres (km²) | hectares | × 100 |
| acres | hectares | × 0.404686 |
| kilometres | metres | × 1,000 |
| square degrees / degrees | — | not physical units: excluded, recomputed from geometry |
| fraction (0–1) | percent | × 100; values over 100% are rejected |
| tonnes carbon (tC) | tonnes CO₂-equivalent | × 3.667 (44/12) |
| biomass Mg/ha | tonnes carbon per ha | × carbon fraction (method recorded with the value) |
| local / US dates (M/D/YY) | ISO-8601 | parsed explicitly; ambiguous formats confirmed from the data |
| local time | UTC | zone recorded; assumption flagged when the source omits it |
| any projected CRS (e.g. UTM 37S) | EPSG:4326 | reprojected; native CRS recorded |
| blank placeholders (" ") | NULL | trimmed and emptied |
Measurements stored in Atlas
Observation types and variables, with their units
Field-by-field treatment per dataset
Open a dataset's 'Fields & units' tab for the full table; summary below
| Field | Source unit | Atlas unit | Treatment |
|---|
| PXLVAL | pixel value (1 = mangrove) | — | kept in source_records; class is always mangrove |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| PXLVAL | pixel value (1 = mangrove) | — | kept in source_records; class is always mangrove |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| PXLVAL | pixel value (1 = mangrove) | — | kept in source_records; class is always mangrove |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| PXLVAL | pixel value (1 = mangrove) | — | kept in source_records; class is always mangrove |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| PXLVAL | pixel value (1 = mangrove) | — | kept in source_records; class is always mangrove |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| cntry_iso3 | country label (cntry_iso3) | — | used to assign each polygon to its country |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| cntry_iso3 | country label (cntry_iso3) | — | used to assign each polygon to its country |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| cntry_iso3 | country label (cntry_iso3) | — | used to assign each polygon to its country |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| cntry_iso3 | country label (cntry_iso3) | — | used to assign each polygon to its country |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| cntry_iso3 | country label (cntry_iso3) | — | used to assign each polygon to its country |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| cntry_iso3 | country label (cntry_iso3) | — | used to assign each polygon to its country |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| cntry_iso3 | country label (cntry_iso3) | — | used to assign each polygon to its country |
| geometry | EPSG:4326 degrees | ha / m | geodesic area and perimeter computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| Shape_Length | unknown (often degrees) | — | EXCLUDED - unit not stated; geodesic area/length computed from geometry instead |
| Shape_Area | unknown (often degrees) | — | EXCLUDED - unit not stated; geodesic area/length computed from geometry instead |
| Area_m2 | m2 | ha | converted |
| geometry | EPSG:4326 degrees | ha / m | geodesic area (ha), perimeter (m) and length (km) computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| geometry | EPSG:4326 degrees | ha / m | geodesic area (ha), perimeter (m) and length (km) computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| Shape_Length | unknown (often degrees) | — | EXCLUDED - unit not stated; geodesic area/length computed from geometry instead |
| Shape_Area | unknown (often degrees) | — | EXCLUDED - unit not stated; geodesic area/length computed from geometry instead |
| geometry | EPSG:4326 degrees | ha / m | geodesic area (ha), perimeter (m) and length (km) computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| Shape_Length | unknown (often degrees) | — | EXCLUDED - unit not stated; geodesic area/length computed from geometry instead |
| Shape_Area | unknown (often degrees) | — | EXCLUDED - unit not stated; geodesic area/length computed from geometry instead |
| Area_sqKm_PA | km2 | ha | converted |
| Area_sq_Km_Country | km2 | ha | converted |
| geometry | EPSG:4326 degrees | ha / m | geodesic area (ha), perimeter (m) and length (km) computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| Shape_Length | unknown (often degrees) | — | EXCLUDED - unit not stated; geodesic area/length computed from geometry instead |
| Shape_Area | unknown (often degrees) | — | EXCLUDED - unit not stated; geodesic area/length computed from geometry instead |
| IRRI_PCT | % (assumed 0-100) | % | kept; values outside 0-100 rejected |
| geometry | EPSG:4326 degrees | ha / m | geodesic area (ha), perimeter (m) and length (km) computed on the WGS 84 ellipsoid with PostGIS |
| Field | Source unit | Atlas unit | Treatment |
|---|
| Shape_Length | unknown (often degrees) | — | EXCLUDED - unit not stated; geodesic area/length computed from geometry instead |
| Shape_Area | unknown (often degrees) | — | EXCLUDED - unit not stated; geodesic area/length computed from geometry instead |
| Shape_Leng | unknown (often degrees) | — | EXCLUDED - unit not stated; geodesic area/length computed from geometry instead |
| geometry | EPSG:4326 degrees | ha / m | geodesic area (ha), perimeter (m) and length (km) computed on the WGS 84 ellipsoid with PostGIS |