Title: Los Angeles Ethnicity
Map Extent: Southern Los Angeles, California
Map Scale: 1:275,000
Media: PowerPoint slide
Page Size (w x h): 908 x 740 pixels
Map Category: Analysis
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This map shows the results of an ethnicity study for southern Los Angeles, California. The purpose of the map is to show where the various ethnic populations are located within the city and where these populations overlap. In the past, such information was either displayed aspatially in tables or geographically on maps showing the density of one ethnic group at a time within the reporting units, such as census block groups. This map offers the advantage of showing where different ethnic groups overlap geographically and where they do not.
The audience for this map is population experts, decision makers, and people who are familiar to some degree with population distributions within Los Angeles. However, the general public should also learn something from this map.
This map was designed for use in a PowerPoint presentation so the speaker could illustrate the important aspects of two spatial statistics tools. First, a hot spot analysis was performed to determine where the ethnic concentrations were located. (Note: This introduced a spatial bias that restricted areas near the perimeter of the study area from being included within the ellipses.) Then, the Directional Distribution tool was used to produce standard deviational ellipses at a 90 percent confidence level.
To map ethnicity, it is necessary to show where the different ethnic groups overlap. In this case, the ellipses were symbolized using transparency to allow overlapping regions to be easily seen.
The labels give additional information about the meaning of each ellipse—in particular, the ethnic group it represents, how many people are in it, and over how large an area they are spread. Color was graded within the ellipses so that the center is lighter and the labels can be read more easily.