A signature is every environmental variable for this query, grouped by band. A single basin gets one value per variable plus its global percentile; a set of basins (buffer, ring, polity) gets a distribution instead -- an area-weighted percentile, a concentrated/spread badge, and a histogram.
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This tab compares each variable's local value (this basin alone) against its upstream value (the whole catchment draining into it), and classifies water provenance from the contrast -- endorheic, coastal terminal, exogenous supply, or local-dominant. Values are read directly off the signature, not separately calculated. At L08 most basins' upstream catchments are small enough that local and upstream nearly coincide; the contrast is most informative at L06.

This tab shows the basin's monthly climatology as two diagrams -- Walter-Lieth (precipitation and temperature by month) and Polar (the same curves traced around a year-clock) -- plus scalar indices summarising them: precipitation and temperature concentration, peak months, the phase offset between the two curves, and temperature's seasonal amplitude.

Two places are never simply "similar" -- they may share a precipitation regime and differ in almost everything else. This panel asks the question one variable-group ("lens") at a time -- Precipitation, Temperature, Terrain, or Climate -- rather than collapsing everything into one composite distance.

It's a membership test, not a ranking: a basin either clears every threshold in the chosen lens or it doesn't, with no partial credit. The result is the actual set of basins meeting those conditions together -- an empty set is as real an answer as a crowded one, meaning nothing else on Earth matches this place on these terms.
Full explanation