Isoline Maps



http://www8.nos.noaa.gov/coris_glossary/index.aspx?letter=i

This is an example of a map with isolines from NOAA.  An isoline is a line on a surface which connects points of equal value.  The isolines may be for purposes of showing any variable in which the cartographer wishes to show on a map and only needs to have the proper tools of measurement to gain the data needed.