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Maps of the Month in 2009

December 2009

According to the Bay Area Air Quality Management District, diesel particulate matter (DPM) at smaller sizes, e.g. 2.5 microns, can be extremely harmful in its effects on public health and might also have an impact on climate change. The source of DPM is diesel engines, which vary in use from haulage trucks to industrial power plants.

The map of the month shows the distribution of DPM emissions within the Bay area. The analysis shows that priority development areas along I-880 and in east San Francisco experience a high volume of DPM emissions compared to development areas north and south of the Bay.

November 2009

The map of the month highlights the impact of combined housing and transportation costs on low-moderate income households in the Bay area. The income range for households in this classification is $35,000 to $60,000. These data were derived through a study conducted by the Center for Neighborhood Technology (CNT) in order to better understand variations in housing and transportation affordability at the neighborhood level. CNT recommends that combined housing and transportation costs not exceed 48% of a household’s income.

October 2009

The map of the month focuses on the variation in bus service along major freeways and highways within the Bay Area. By isolating bus route segments along major freeways, and adding up the number of daily trips along those segments, a general overview of the amount of bus transit service along the major freeways and highways was determined. The daily number of trips represents the aggregate total of all bus trips for all transit operators with service along each major freeway or highway segment. Among the most heavily served corridors, Interstate 880 Northbound between the San Jose Diridon Transit Center and the Fremont BART Station has approximately 30 trips per mile segment while I-80 has a daily average of 20 trips per mile segment in both directions between Fairfield Transit Center in Solano County, and El Cerrito Del Norte BART Station in Contra Costa County.

July 2009

The map of the month demonstrates that the statewide distribution of funding by county for state services in California is largely dependent on the revenue collected through income taxes. Counties whose residents pay higher income tax rates enable the state to fund services and programs in counties that generate less revenue for the state through income tax. This map shows this distribution based on funding data from FY 2007-2008. For the purposes of this analysis, state services include prison, parole, mental health, medical aid, K-12 education, in-home supportive services and separate state programs.

June 2009

The map of the month depicts a report currently being prepared by the Bay Conservation and Development Commission (BCDC), “Living with a Rising Bay: Climate Change impacts on the San Francisco Bay and Adaptation Strategies.” The report highlights areas in the region vulnerable to sea level rise. The map of the month outlines the extent of the possible effects of sea level rise on existing and future transportation infrastructure by showing segments that exist or are being planned within vulnerable areas. Based upon this analysis, BCDC has found 671 miles of existing and 337 miles of future road, rail, air, and other infrastructure at risk of being affected by potential sea level rise.

May 2009

The most recent publication of Bay Nature magazine features this updated Transit to Trails map of the San Francisco Bay Area. The map promotes the use of the 511 Transit Trip Planner’s ability to locate outdoor recreational opportunities that exist in the Bay Area region, by highlighting several bay area parks, beaches, and trails that are accessible by public transit.

April 2009

The map of the month depicts the 10 high-speed rail corridors (shown in red) identified in President Obama’s strategic plan released last week. The process of designating these high-speed rail corridors actually has occurred over the past two decades, with the first corridors (including California) identified by the Secretary of Transportation in 1992.

March 2009

The map of the month illustrates the dramatic shift in unemployment rates by county for the state of California. California’s unemployment rate was 10.5 percent in February 2009. One year ago, half of California's counties had unemployment rates below 8 percent; in February of this year, there are only four counties with an unemployment rate below 8% (Marin, San Mateo, Mono, and Orange County). The year-over-year change (February 2008 to February 2009) shows a decrease of 605,900 jobs statewide. The nine-county Bay Area unemployment rates are in the lower end of the current range. Santa Clara has the highest rate, 9.9%, and Marin has the lowest rate in the State, 6.8%.

February 2009

According to a report being prepared by the Bay Area Conservation and Development Commission ("Living with a Rising Bay: Climate Change Impacts on San Francisco Bay and Adaptation Strategies," available in 2009), the sea level in the Bay could rise a foot or more, inundating some communities and covering both the San Francisco and Oakland airports, state highways, and other key road and transit infrastructure.

January 2009

The map of the month shows the share of the population living beneath 200% of the Federal poverty level, according to 2007 American Community Survey data. While the larger shares of poverty occur in rural counties, urban counties have the largest gross number of people in poverty. In a ranking of the top ten counties in California by total persons in poverty, Alameda and Santa Clara Counties rank eighth and ninth, respectively.

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