----------------------------Original message---------------------------- Greetings! An interesting question arose out of a conversation I enjoyed recently, and I am hoping that one of you cartographic gurus out there may be able to help me find the term or expression I am seeking... As we all know, an Isoline (or isarithm) is a line on a map that joins up points of equal value. Thus, * Isochrones join up points of equal (travel?) time; * Isotherms join up points of equal temperature; * Isobaths join up points of equal water depth; * Isobars join up points of equal barometric pressure; * Isohyets join up points of equal rainfall; * Isohypses, or contours, join up points of equal topographic elevation. Next: as we all know, there are some topographic maps, where the areas between succesive contours are colour-shaded with a suitable colour ramp, so that broad bands of elevation range are denoted (e.g. 0 - 50 m in pale green; 51 - 100 m in darker green; 101 - 150 m in olive brown; etc, through dark brown, purple and white for the highest elevations in mountainous terrain). These maps are known as Hypsometric maps. Okay, so our question..... if an isoline (or isarithm) is the generic term for the lines that link points of equal value, what is the corresponding generic name for the polygon/broad zone that lies BETWEEN succesive isarithms, (such as the colour-coded zones on a hypsometric map)? I'm guessing at "isopleth", but would appreciate confirmation or correction.... Many thanks Darius Bartlett *************************************************************************** Darius Bartlett Darius Bartlett Department of Geography Roinn na Tireolaiochta University College Cork Colaste na hOllscoile Corcaigh Cork, Ireland Corcaigh, Eire Phone: (+353) 21 902835 Fax: (+353) 21 271980 Internet: [log in to unmask] WWW: http://www.ucc.ie:80/ucc.depts/geography --------------------------------------------------------------------------- "Cyberspace. A consensual hallucination experienced daily by billions of legitimate operators". - William Gibson, 'Neuromancer' (1984. Harper Collins) ***************************************************************************