VoteVector

VoteVector links county election ballots to residential parcels and neighborhood polygons so analysts can see where voting participation is concentrated. The experience focuses on participation density rather than individual preference—no party or candidate data is displayed.

NPI is a structural diagnostic: assigned ballots ÷ residential (situs) parcels for each neighborhood. Scores above 1.0 mean more than one ballot per home, signaling a denser civic footprint; lower values highlight neighborhoods with slack participation.

The legend reflects NPI quartiles: deep green (Quartile 4) marks the highest participation density, lighter green (Quartile 3) is above-average, amber (Quartile 2) is below-average, and warm orange (Quartile 1) highlights the lowest density. Each bucket shares identical geometry, so color shifts immediately show how one neighborhood compares with the rest of the county.

Assignment coverage shows the percent of precinct ballots that VoteVector successfully matched to a parcel inside the neighborhood (assigned ÷ precinct ballots). Strong coverage signals a clean parcel-to-ballot alignment; lower values flag precincts where PO Boxes or outside-the-neighborhood addresses limit coverage.

Ambiguous matches count ballots that could not be tied to a single parcel (duplicates, unresolved PO Boxes, or non-locatable records). They are withheld from the NPI math but surfaced in every tooltip and popup so you always know how many ballots were excluded.

Each popup includes a precinct participation indicator (PPI = precinct ballots ÷ precinct residential parcels) plus the precinct PO Box rate. Comparing NPI to PPI shows whether a neighborhood is driving or lagging the larger precinct context.

PO Box ballots stay in the precinct totals (so they influence PPI and the PO Box rate), but they cannot be reliably geocoded to parcels. When the service can’t locate them, they appear inside the assignment coverage and ambiguous lines—making the gap transparent rather than silently inflating a neighborhood’s NPI.

The year selector above the legend pulls the latest election year automatically, and the API surfaces additional years in the dropdown. Switch years to redraw the map and ticker with that election’s fact table so you can spot whether density tightened or loosened over time.

Hover tooltips stream a quick-read card: neighborhood name, code, quartile, ballots, parcels, NPI, assignment coverage, ambiguous totals, and precinct context. Clicking locks the boundary, deepens the outline, and opens a popup with the full detail stack (including the election year, residential baseline, and primary precinct identifiers).