Mapping Site Analysis Areas

Many of us are interested in small area demographics to aggregate the data into larger areas for site and study area analysis. Small area geographies include census blocksblock groupscensus tractsZIP code areas, among others. This section reviews mapping and GIS resources to visually examine site analysis areas. See related Web section for more details and updates.

The Missouri Census Data Center (MCDC) has developed Circular Area Profiling System (CAPS) Web-based tools that enable the user to create a demographic profile for a circular area where the user specifies the point/location of interest (latitude-longitude) and associated radii. Enter the latitude-longitude and radius values, related details, and click Generate Report. The report is generated, displayed in HTML and created as a CSV file available for download. Try it yourself. Further details … on the CAPS10C entry form enter the latitude and longitude values 38.631551 and -90.193009, respectively. (alternatively, enter the ZIP code value 63101 in the Latitude box and have the application look up these ZIP code centroid coordinates.) Enter the two radii (1 3) in the “Enter up to 5 radius value” text box provided. The 1-mile radius report shows characteristics of the circular area with a total population of 13,095; the 3-mile radius report has a total population of 80,258.

Mapping the Circular Area Profiles
The MCDC tool does not create a map showing the location and features of the site/study area. The CAPS geocode data file can be imported into CV XE GIS for mapping and geospatial analysis. An example of the map developed for the site described above is shown in the following graphic. The census blocks in the one-mile radius are shown in blue; census blocks in the three-mile radius are shown in green. The “ground zero” point location in St. Louis, MO is shown by the red marker. Other layers could be added.

Once the GIS project is set up, many other visual and geospatial analysis possibilities exist. The following view shows a zoom-in to the 1-mile radius area. The CV XE GIS identify tool is used to display a mini-profile for a census block of interest (see pointer). Census blocks are labeled with the population value. As of Census 2010, this block had 488 population and 331 housing units.

Using the CAPS GIS Illustration Project
To explore the CAPS GIS project used to develop the above views, follow these steps:
• Expand the CAPS GIS zip file to a new folder (e.g., d:\xyz)
– requires no fee User Group id and password: more about User Group below.
• With CV XE GIS running, open the project d:\xyz\caps1.gis.
– where d:\xyz is the folder containing the unzipped files.
– the start-up view will appear as shown in the view at the top of this section.
– if you have not installed CV XE GIS, install the no fee, no registration version.

Scope of Circular Area Profiles
Circular Area Profiles may be developed for any location in the U.S. The Circular Area Profiles may be generated using data from Census 2010 and American Community Survey. The focus of this section is on census block profiles based on Census 2010. An update will expand on possibilities for visual analysis.

Options to Create Map Views
There are three options to create site maps such as the one shown above.
• ProximityOne User Group members may use CV XE GIS tools to develop the GIS project (no fee).
– this involves several technical steps, summarized in a separate section.
• CV XE GIS Level 3 automatically creates the GIS project (fee based).
– a feature imports the CAPS geo file & creates the ready-to-use GIS project.
– Optionally use CV API to attach additional demographics to each block or elemental area.
• ProximityOne creates map views like those shown above (fee based).
– this option requires no software or data file operations.

ProximityOne User Group
Join the ProximityOne User Group to download and use the CV XE GIS Level 1 supporting creation of the CAPS maps and much more. Receive updates and access to tools and resources available only to members. Use this form to join the User Group. There is no fee.

DMI Web Sessions
Learn more about using small area demographic-economic data and GIS tools. Join us in a Decision-Making Information Web session. There is no fee for these one-hour Web sessions. Each informal session is focused on a specific topic. The open structure also provides for Q&A and discussion of application issues of interest to participants.

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