Thiessen polygon method

Thiessen polygon method

[′tē·sən ′päl·i‚gän ‚meth·əd] (meteorology) A method of assigning areal significance to point rainfall values: perpendicular bisectors are constructed to the lines joining each measuring station with those immediately surrounding it; the bisectors form a series of polygons, each polygon containing one station; the value of precipitation measured at a station is assigned to the whole area covered by the enclosing polygon.