A Saturday in July

This visualization illustrates the ebb and flow of the island population on an average Saturday in July 2017, incorporating mobility data, ferries, and planes.

NDP’s “Making It Count” Event at the Dreamland

Check out the full video of our “Making It Count” event at the Dreamland where we unveiled the Effective Population Study on July 17th, 2018

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Permanent Population

We estimated Nantucket’s permanent population by asking Civis Analytics to look into its database of 251 million American adults.  We developed a “Permanent Resident Filter” with the goal of determining high confidence permanent residents.

We then compared this list to the Town of Nantucket’s Street List.  We identified 11,000 duplicates and 3,000 “Civis Nantucketers.”  Through detailed demographic estimation methods it was estimated 3,200 children are permanent residents of Nantucket.

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Permanent Population Simplified

In this Sankey Flow chart, it’s easy to understand the process of deriving estimates of adults from the town Street list and the Civis Database, calculating the number of children, and then adding those three groups together.

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Effective Population

By using trip level ferry data and by modeling monthly airline data we were able to estimate population on a daily basis.

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High Season

Understanding that that high season drives much of the island’s economic activity, we focused on the May to October period for 2017.  In this chart we looked at the “Net flow of people per day.”

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Population by Minute

Because of the granularity of our data we were able to look at a typical Saturday in July and track how many people were coming or going by minute.

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Visitor Origin

In this graphic image we think of travel as a tree with various branches growing from the source – Nantucket.  This data represents visitor origins of a typical Saturday in July.

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Visitor Demographics

In this dashboard you can see typical demographics for summer 2017 visitors.

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Weather

These charts illustrate the effect of weather on transportation patterns.

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Summer Patterns

For decades it has been said that in August there are more New Yorkers on-island than Bostonians.  While New Yorkers have their highest population on-island in early August, in fact, Bostonians often are twice as common as New Yorkers.

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Favorite Beaches

By using anonymized mobility data NDP can understand the home location of island visitors.

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Shopping Patterns

Using anonymized mobility data NDP determined when people shop at the mid-island Stop & Shop.