[statistics] in which there are three related variable such as Z=f(x,y), each level curve represents one fixed Z value and different combinations of the values of x and y.
LEVEL CURVE
Meaning of LEVEL CURVE in English
Sean Woo's Finance, GIS and real estate English glossary. Английский глоссарий по ГИС(Географическая информационная система) и недвижимости Sean Woo's Finance. 2012