Group, I have a question for you regarding distance calculations in MapInfo. I am trying to find out the best way to determine how many points lie within a "x" mile radius of a centralized point. I tried to do determine this information 2 different ways in MapInfo, and received 2 different answers.
Ex. I have geocodes for where customers originate, and I want to see how many of them are coming from within 5 miles of my store. Method 1: Perform a query (Query1) to determine distance calculation Distance (Customer_Lon, Customer_Lat, Store_Lon, Store_Lat, "mi") Then, perform another query on Query1 to get all of the distances <= 5 miles Method 2: Select the store and create a concentric ring (actually only create 1 ring of 5 mile radius). Press Calculate Ring Statistics button to get the # of geocoded customers within 5 miles. (I even included records that were "at least partly within" the ring.) Does anyone know why these 2 methods yield different results? -------------------------------------------------------------------- Philip Lesnik Research Systems Analyst, Market Research General Growth Properties, Inc. 110 N. Wacker Drive BSC 3-13 Chicago, IL 60606 312-960-2998 312-960-5519 (fax) [EMAIL PROTECTED] -------------------------------------------------------------------- ----------------------------------------- +++++++++++++++++++++++++++++++++++++++++++++++++++++++ Notice: This e-mail including attachments) is covered by the Electronic Communications Privacy Act, 18 U.S.C. �� 2510-2521, is confidential and may be legally privileged. If you are not the intended recipient, you are hereby notified that any retention, dissemination, distribution, or copying of this communication is strictly prohibited. Please reply to the sender that you have received the message in error, then delete it. Thank you. +++++++++++++++++++++++++++++++++++++++++++++++++++++++ --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 11611
