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Using Data »

Census tracts within a radius

I am looking for a way to get the ACS data for a radius around a given point. Using the FCC's API I can get the Census Tract and Block number to use. Does anyone know of a way to get the Census tract numbers say within a 5 mile radius?

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Submitted by Community Member 1 year ago

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    1 year ago
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    1 year ago

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    1 year ago

Comments (12)

  1. Plot it on a map, draw a circle, find all points inside the circle.

    Plug names into Google maps, parse distance between points, find any distance less then or equal to 5.

    1 year ago
    1. Community Member Idea Submitter

      I guess I was hoping for an easier method, but I can make this work. Thanks!

      1 year ago
    2. Glad to help, I don't know if there is a database you can get to that holds coordinates, but if you can get a hold of one, finding relative positions should be easy as well.

      1 year ago
    3. Phillip, how do you find all internal points inside the circle using the API?

      1 year ago
    4. The API shouldn't handle getting points inside a circle. This kind of math should be handled within the program prior to forming a request to the API (to get a list of geographies you want to make a request on).

      1 year ago
    5. Phillip, I just wanted to point out that "finding all points inside the circle" and then I guess testing ALL points to find all geographies involved within the circle before retrieving the demographic data for those geographies may be theoretically possible but I think practically impossible. There must be a better way to do it. I am curious to know for example how this is done on American Fact Finder where we can get very fast a list of geographies within a circle or a rectangle.

      1 year ago
    6. They do exactly as you theorize is impractical.

      1 year ago
  2. Check the description of the OGC WMS compliant services at tigerweb.geo.census.gov/tigerwebmain/TIGERweb_main.html to see if there's something there that will work for you.

    1 year ago
  3. You can use the MABLE/Geocorr12: Geographic Correspondence Engine by Missouri Census Data Center.

    http://mcdc.missouri.edu/websas/geocorr12.html

    The point and distance filter lets you define a circle.

    1 year ago
  4. gio

    when you get a TIGER geography file there should be two fields (intplat and intplng) that provide the centroid point for the geography in question...you can use these to calculate the distance

    1 year ago
    1. Just to clarify. An Internal Point in TIGER is not always equal to the centroid. We ensure that the internal point falls inside the entity and on a land face if there is one.

      1 year ago
  5. Nice catch gio.

    1 year ago