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Mobile Device Stops in a Census Block Group

SafeGraph’s Patterns dataset provides data on mobile device visits to over 42,000 points of interest (POIs) in the State of Hawaii. A “visit” is when a mobile device dwells in one of these POIs for at least four minutes. SafeGraph also provides a Neighborhood Patterns dataset on mobile device stops within 872 Hawaiian census block groups, small areas of varying size generally defined to contain between 600 and 3,000 people. A “stop” is when a mobile device dwells in a census block group for at least one minute.

Mobile device visits or stops typically falls into one of four categories: coming from home, coming from a daytime or work location, coming from a nearby accommodation while on vacation, or coming from a nearby POI while on a multi-purpose trip. When a mobile device visits a POI, the purpose of that visit is more than likely to purchase the goods or services that POI offers. When a mobile device stops in a census block group, however, we have to speculate about the purpose of the visit using extra information such as the date, the time of day, or how long the device dwelled.

Popularity by Day During the Merrie Monarch Festival

The Data: The bar chart below shows the number of stops in Hilo census block group 150010205001, where the Merrie Monarch Festival takes place, by day of month (stops_by_day) for those months when the Merrie Monarch Festival was scheduled to take place.

What To Look For: Look at the impact that the Merrie Monarch Festival, a non-profit organization and week-long cultural event held in Hilo every spring, had on mobile device stops in the Hilo census block group where the festival is held. Device stops more than doubled when the festival occurred in-person in April 2018 and April 2019. Contrast mobile device stops in April 2020 when the festival was cancelled, and June 2021, when it was held without a live audience.

See bar chart below.

What Were the “Home” Areas of the Mobile Devices That Visited Here?

The Data: The proportional symbol map below shows where mobile device visitors to this census block group in Hilo came from by their own home census block group (device_home_areas), including mobile devices whose home was this census block group, during months when the Merrie Monarch Festival was scheduled to take place. The “home” location of a device is determined by analyzing the last six weeks of dwell times during nighttime hours from 6 pm to 7 am local time. Symbols are sized and colored proportional to the number of devices that stopped.

What To Look For: Visitors to this census block group in Hilo came from every county in the State of Hawaii and all over the mainland in April 2018, April 2019, and even June 2021. In April 2020, however, there were few visitors from outside of Hawaiʻi County.

Zoom in, turn on layers, and scroll over the map below.

When Were the Mobile Devices Dwelling Here?

The Data: The proportional symbol map below shows the different “home” locations of visitors who stopped in this census block group in Hilo by the time of day they stopped and how long they dwelled in April 2018. Symbols are sized and colored proportional to the number of devices that stopped.

What To Look For: Click on the nine layers to see how the market in this Hilo census block may change over the course of the week or a single day. The nine layers map include devices that stopped at the following times:

  1. At any time (device_home_areas)
  2. During work hours 7:30 am to 5:30 pm Monday through Friday local time (work_device_work_hours)
  3. Monday through Friday local time (weekday_device_home_areas)
  4. Saturday and Sunday local time (weekend_device_home_areas)
  5. Breakfast, 6 am to 10:59 am local time (breakfast_device_home_areas)
  6. Lunch, 11 am to 2:59 pm local time (lunch_device_home_areas)
  7. Afternoon Tea, 3 pm to 4:59 am local time (afternoon_tea_device_home_areas)
  8. Dinner, 5 pm to 8:59 pm local time (dinner_device_home_areas)
  9. Nightlife, 9 pm to midnight local time (nightlife_device_home_areas)
Zoom in, turn on layers, and scroll over the map below.

TECHNICAL NOTES

SafeGraph variable names are in parenthesis. For detailed information on how SafeGraph variables were derived, see the SafeGraph documentation. SafeGraph data was processed for the State of Hawaii using PostgreSQL and PostGIS then added into R. SafeGraph point of interest geometry data, including highly-accurate building footprints, is being continually updated. SafeGraph strives for coordinate accuracy less than 10 meters away from an accepted coordinate truth set (Google Maps). Please let us know if you recognize any coordinate accuracy issues in the web maps presented above. Graphs and bar charts developed in R included use of the dygraphs and ggplot2 packages. Web maps developed in R included use of the leaflet package.

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