A West Philly based activist and programmer has built an app that allows people to visualize changes in income and racial diversity in their neighborhoods.

Aaron Kreider’s JusticeMap.org, an open online map layering race and income data across the United States, allows residents to analyze and visualize neighborhood’s socioeconomic shifts. Using data pulled by the U.S. Census Bureau, the comprehensive high resolution map — created with the support of the Sunlight Foundation — features the breakdown of race by block, county, census, and block group, while household income data are available by county or census tract. So, for example, JusticeMap.org allows you to easily find out the majority of residents in the 19143 zip code have a household income of $40,000 or less.

A map showing income levels for the 19143 zip code. Source: JusticeMap.org

“For several years I have wanted to make maps of the race and income data from the U.S. Census to help people visualize the large differences in race and income between counties, cities, neighborhoods and even blocks,” Kreider, who runs CampusActivism.org, wrote in a blog post for Sunlight Foundation in late January. “My goal is to help people, who do not have any map making or geographical information systems experience, to create maps that combine these open map layers with their own data.”

JusticeMap.org also includes some intriguing features that make visualizing and saving data with the open online map both easy and innovative. Users can save the map as an image, make their own map and host on their own site, add shapes to the map, use tile layers on an existing map, conduct statistical comparisons and different geographical intersections, and download the data. We’ve included a map of income levels in Philadelphia for readers to test below, but we suggest you head to the site and go through the data hands-on.

-Annamarya Scaccia

The Philadelphia Inquirer includes a story today on changes in Philadelphia’s black population, which for the first time “clearly outnumbers” all other ethnic or racial groups. But the population is shifting, with large gains in population in places like the lower Northeast and Southwest, but losses here in West Philadelphia, the Northwest part of the city and in neighborhoods around Center City.

Whites leaving the city is the key factor in the increased percentage of blacks, the Inquirer reports. Middle-class blacks leaving the city for the suburbs is a related trend. The black population in the Pennsylvania suburbs increased 26 percent since 2000.

About 21 percent of the city’s population is now Asian and Hispanic.

Here’s an interesting map showing racial and ethnic population distribution in our part of Philadelphia (though it will also work for any town in the country)  put together by the New York Times using 2005-2009 survey data. West Philly writer Patrick Kerkstra alerted us to this. The distribution in West Philly shouldn’t surprise anyone. Cedar Park, for example, shows up 47 percent white and 40 percent black. Walnut Hill is 60 percent black and 29 percent white.

The data comes from the U.S. Census Bureau’s American Community Survey, not the 2010 Census itself. The data was released yesterday.

Thanks Patrick.