Isoline Map

http://www.nzdl.org/gsdlmod?e=d-00000-00---off-0ccgi--00-0----0-10-0---0---0direct-10---4-------0-0l--11-en-50---20-help---00-0-1-00-0-0-11-1-0utfZz-8-00&a=d&c=ccgi&cl=CL2.5&d=HASH01815a5264fa0f4bfa328693.8
Isoline maps convey numerical or statistical data using lines that cover areas on the map with like numerical data. This map of China represents annual precipitation in the region. The lines connect areas with like rainfall, so where there is annual rainfall of about 400 mm, you can follow the line to see where else the annual rainfall is about 400 mm.