Importance of Granulation (large scale map) in Maps


I created the above map using the tutorials in ESRI website for ArcGIS & the content from GIS Tutorial for Health. The map explores the Mammography clinics in relations to counties in Pennsylvania. The pattern of high concentration around cities of Pittsburg and Philadelphia is evident from the maps.

Few other observations from the map are:

Potter and Sullivan counties have fewer women aged 40-74, but still, there are no clinics. They are obvious areas of the state where clinics are needed.
Monroe, Clearfield, Jefferson counties have higher women aged 40-74, but a relatively
small number of clinics.
Philadelphia & Pittsburg surrounding areas have enough clinics, but remote northwestern and northeastern counties need more clinics.

The power of GIS can be further explored to look into the cities that sound to have more mammography clinics, in the map below :


This map shows that though Allegheny county hosts Pittsburg, there is a pattern of concentration of clinics in the south relatively more urban part of the city. The pattern correlates with other healthcare facilities in the county that counts towards health equities in this county.

Granulation to the smallest unit possible brings in more refined data on what seems to be different in small scale.