Filter tracts by threshold to find underserved areas
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3D View
Click a tract to see score
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Select a lens, then click a tract
All Lenses
Infrastructure Layers
Custom Zone Analysis
Δ Explore Patterns
How Related Are Two Metrics?
See whether education scores and another metric tend to move together across tracts.
Pattern Strength—
Select a metric and click "Find Pattern" to explore.
info
Correlation ≠ Causation. A pattern between two metrics means they tend to move together—it does not prove that one causes the other. Many outside factors may contribute.
Tract Data Snapshot
Click a tract on the map while in pattern mode to see its data summary.
Data Status:Select Tract
drawDraw a region on the map
touch_appClick to place points. Double-click or click the first point to close the shape.
Methodology & FAQ
Where does the data come from?▶
SparkMap synthesizes data from three primary sources:
Opportunity Atlas
From Harvard/Census Bureau, provides income mobility and incarceration rate estimates at the census-tract level. opportunityinsights.org
Child Opportunity Index 3.0
From diversitydatakids.org, a composite index measuring neighborhood opportunity across education, health/environment, and social/economic domains. diversitydatakids.org
Census & ACS
Tract boundaries from U.S. Census Bureau 2020 TIGER/Line shapefiles.
How are the six data lenses calculated?▶
trending_upIncome Mobility - Mean household income rank (percentile 0%–100%) for children who grew up in each tract. Source: Opportunity Atlas (kfr_pooled_pooled_mean).
track_changesOpportunity Index - Overall Child Opportunity Index z-score (z_COI_nat), combining 30+ indicators into a national-normed score. Ranges from -3.0 to +3.0.
schoolEducation - COI education domain z-score (z_ED_nat). Includes early childhood education, reading/math proficiency, HS graduation rates. Ranges from -3.0 to +3.0.
health_and_safetyHealth/Environment - COI health & environment domain z-score (z_HE_nat). Includes health insurance, toxic exposure, air quality, food access. Ranges from -3.0 to +3.0.
groupsSocial/Economic - COI social & economic domain z-score (z_SE_nat). Includes poverty rate, employment, median household income. Ranges from -3.0 to +3.0.
gavelIncarceration - Mean incarceration rate for children who grew up in each tract. Source: Opportunity Atlas (jail_pooled_pooled_mean). Ranges from 0% to 100%.
Why are some tracts colored purple?▶
Purple tracts are designated Special Locations - areas like airports, correctional facilities, or institutional campuses that lack meaningful residential census data.
How should I use this for advocacy?▶
1. Use the top lens tabs to identify the most under-resourced tracts. 2. Group tracts into a Custom Zone to generate neighborhood-level summary data. 3. Export filtered tracts as CSV for grant applications and policy briefs. 4. Switch to 3D mode to visualize disparities in infrastructure and opportunity.
