Isopleth map - Spain

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Isopleth is a more general term referring to lines of equal data types (like temperature or height).  Isopleth maps are generally more suited to displaying continuous data, rather than “patchy” distributions of data (compared to choropleth maps).  The isopleth used in this particular map is precipitation (in northeastern Spain on June 10, 2000), measured in mm (although the legend on the right says m – that is incorrect).  We can see that the most precipitation is just north of Montserrat (dark blue).  The tight isopleths (or isohyets, to be exact) indicate that the amount of precipitation increases more around this area than in other areas where the isohyets are further apart.