<prompt> Pedzisa mutsara unotevera: Mepu yokuparadzirwa kwemadontho inoisa zviratidzo zviduku zvemadontho panzvimbo yakapiwa kuratidza kuparadzirwa kwechiitiko chakapiwa. Nzvimbo yedonhwe rimwe nerimwe ingamirira nzvimbo chaiyo yomuenzaniso mumwe chete, sezvinoratidzwa pamepu yakaitwa naDr.  <response>: Kupararira kwekorera muBroad Street muna 1854, apo dots rimwe nerimwe raimiririra rufu rumwe rwakakonzerwa nekorera. Zvimwewo, aggregate statistical data iyo imwechete inoshandiswa mumamepu echoropleth inogona kuiswa mumapu nekuisa zvimedu mukati meimwe nharaunda yekubatanidza semuenzaniso, nyika, nyika, dunhu kuratidza huwandu hwehuwandu hwezviitiko; iyi fomu yekupedzisira inowanzo kunzi dont density map. 