Maps & GIS

MAP: A Republican in Arlington, Once Upon a Time

Veteran Rep. Frank Wolf (R) announced this morning that he was declining to seek re-election. First elected in 1980 after unseating a Democrat, his district, once based in Arlington and inner Fairfax Counties in Virginia and stretching out to then rural Loudoun County, his district marched steadily westward, fleeing the increasingly Democratic inner suburbs. A Republican representing Arlington in Congress–a completely unthinkable scenario now in a county that lacks a single Republican elected official on any level

Below is a quick map I prepared comparing his first 1980 district with his now second to last district in 2013. The purple area contains overlap, the red area parts of the district lost since the 80s, and the blue area gained since then, using this excellent trove of historical boundary data from UCLA.



Here is the same map, featuring the current district after the 2010 redistricting:


MAP: Saint Petersburg Mayoral Election

On Tuesday, voters in Saint Petersburg, Florida voted in the first round of this year’s mayoral election, advancing incumbent Mayor Bill Foster and Rick Kriseman to the runoff election in November.

Below is a dot density map where one dot equals one vote. This graphic is heavily inspired by the Los Angeles Times maps of Los Angeles elections.


Entries and Exits: Map of a Day on the Washington Metro


The above graphic maps, per hour, entries and exits per station on a typical weekday on the Washington Metro, similar to this animation of the London Underground. Station data by hour was provided by WMATA for October 2012.

Red stations have more exits than entries in a given hour, while green stations have more entries. Early in the day, commuters flood in from outlying suburban stations and exit in the downtown core. During mid-day, suburban stations are quieter while downtown stations have balanced entries and exits. The commute flow reverses in the evening. We can divide stations into three types as land-use patterns and a station’s purpose can be discerned by their coloring and size behavior.

1) Job centers. The core contains most of the area’s commuter destinations, with Medical Center on the Red Line a notable outlier. During the lunch hour, ridership is higher than in bedroom communities. Riders exit these stations in the morning and enter them in the evening.

2) Bedrooms and park and rides. These stations, mostly outside the core, are nearly empty outside of rush hour. Commuters enter in the morning and exit at night.

3) Transportation hubs. These stations tend to remain white in the map with largely equal exits and entries as long-distance passengers use Union Station and National Airport. Pentagon, despite being home to the world’s largest office building, also sees even entries and exits during most of the rush hour with a large portion of transferring passengers using the Pentagon bus terminal.

4) Mixed-use areas. Arlington County stations between Rosslyn and Ballston are good examples of areas with both jobs and residents, giving them largely even entries and exits during rush hour.

Stations are mapped to their actual geographic location, which looks substantially different than the diagrammatic official map.

INTERACTIVE MAP: June 11 VA Democratic Primary by Polling Place

The following maps show precinct-level unofficial returns for statewide offices in the June 11, 2013 Virginia Democratic Primary.

Each dot represents one polling place, totals for polling places with more than one precinct are combined. Click to retrieve individual results, and use the zoom and pan tools to zero in on a neighborhood.

Democrats nominated State Sen. Ralph Northam and State Sen. Mark Herring to join gubernatorial nominee Terry McAuliffe. Republicans held a statewide nominating convention last month, which I mapped here.

Absentee ballots in Virginia are not broken down by precinct, and are not included in the maps.

For interactive county-level maps, check VPAP. I geocoded polling places obtained from the State Board of Elections directory in lieu of obtaining shapefiles from each locality.

These maps both look very similar. Both Northam and Herring assembled closely associated coalitions.

Last Updated: June 12th, 1:08 AM.
2508/2534 precincts (99% reporting)

Lieutenant Governor

    Candidate Votes Percent
    Ralph Northam 76,463 54.28%
    Aneesh Chopra 65,997 45.81%

Attorney General

    Candidate Votes Percent
    Mark Herring 71,037 51.63%
    Justin Fairfax 66,547 48.37%

GIF: Mapping EW Jackson’s RPV Convention Victory


The above map shows the winner of each city or county’s delegation from last month’s Republican Party of Virginia convention. A handful of counties and cities were combined into the same delegations, and that is reflected in the map.

If you haven’t heard of E.W. Jackson, this year’s Republican nominee for Lieutenant Governor in Virginia, by now, you certainly will by Election Day. After muscling out six competitors in four ballots at last month’s Republican Party of Virginia convention in Richmond, Democrats immediately reacted with glee. Jackson is a melon-smashing, gay-bashing, segregation-defending right-wing Tea Partier who blurs the lines between the truth and satire. Like it or not though, he led every round of balloting at the RPV convention and held his ground as the chaotic opposition scrambled from candidate to candidate. One wonders how many exhausted delegates leaving an all-day marathon balloting session thought they’d rather have an instant-runoff primary.

The convention format is not kind to moderates. Only diehards would stomach the thought of traveling for hours (the farthest reaches of Southwest Virginia are over 6 hours away from Richmond) to spend all day in a convention hall. Bill Bolling and Tom Davis knew this when faced with a convention for higher statewide office, and Tom Davis’s wife Jeannemarie (no conservative slouch herself, but this is within a Republicans-only electorate here) learned the hard way this time around.

Official RPV results are here.

Interactive Map: Gainesville Mayoral Election

Results by precinct from the March 19, 2013 election for Mayor of Gainesville, Florida are below. The top two candidates in this nonpartisan election will proceed to a runoff.

Mouse over the map to display labels for precincts and roads. You can also use the legend or data table to select precincts by clicking on them.

GIF: Deeds’ and Hanger’s 24 Year Redistricting Dance

State Senators Creigh Deeds (D-Bath) and Emmett Hanger (R-Mount Solon) were the only two Senators in last week’s Republican-proposed mid-decade redistricting to be thrown into the same district.

Should both seek re-election without moving, they would battle each other for the new 24th District in 2015, 24 years after Deeds defeated then-Delegate Emmett Hanger for House District 18 in 1991.

In the decades since, elections and redistricting have radically shifted the territory they have represented, overlapping and adjacent, to the point where they are barely connected at all to their original bases, shown in the animation at right.

1983 Election (not shown) – Emmett Hanger elected to the House District 26.

1990 Census – Democratic-controlled redistricting pushes Hanger into House District 18.

1991 Election – Deeds defeats Hanger in House District 18.

1995 Election – Hanger is elected to the Senate District 24, they share the area in purple.

2000 Census – Republican-controlled redistricting pushes Deeds into House District 12. Deeds territory heads south, Hanger territory heads east and they no longer share territory.

2001 Special – State Sen. Emily Couric dies and Deeds, after winning re-election to his House seat, wins a special election to Senate District 25.

2011 Census – Democratic-controlled redistricting stretches Hanger’s district even further east.

2013 Mid-Decade – Proposed redistricting places both Deeds and Hanger into Senate District 24.

(I’ll be happy to add a frame for 1983 if a Virginian can dig and scan in a map of the 1980 districts, presumably in a nearby library: