Atlas · Djibouti / Methodologies
METHODOLOGIES

Field plots versus the map

A consistency check between survey plots and mapped formations.

Intermediate 1 min read accuracyfield surveyvalidation

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.

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