Atlas · Djibouti
/
Methodologies
METHODOLOGIES
Field plots versus the map
A consistency check between survey plots and mapped formations.
Method
Each field plot point is intersected with the formation polygons (ST_Intersects). Plots on a polygon are compared with the formation recorded in the field; the share that match is reported.
Limits. This is not a formal accuracy assessment (no stratified random sample, no confusion-matrix confidence intervals). Plots off the map are reported separately.
Related reading
More in Methodologies
- Why Atlas totals are 2.3% higher than the official figures
- Spatial statistics: Moran's I and Getis-Ord Gi*
- How units are harmonised on import
- Net change versus gross loss and gain
- Geodesic area and perimeter
- Versions and cumulative updates
- The rules behind recommendations
- Confidence labels: calculated, illustrative, assumed
Still have a question?
The AI analyst answers from these articles and from the data.
Ask Atlas