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Geocoding Our Nation's Schools - Blue Raster NCES Stats-DC 2012 Presentation

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Geocoding Our Nation's Schools - Blue Raster NCES Stats-DC 2012 Presentation

  1. 1. NCES STATS-DC 2012 – July 13, 2012Presented by Tai Phan & Adrienne AllegrettiNCES, Blue RasterGEOCODING OUR NATION’S SCHOOLS
  2. 2. PRESENTATION OUTLINE  Introduction  Overview of Geocoding  Data Preparation  Selecting a Geocode Solution  Live Demonstration  Overview of SDDS Updates  Summary/Q & A
  3. 3. WHAT IS GEOCODING?  The process of finding associated geographic coordinates (latitude and longitude) from other geographic data, such as street addresses, or zip codes (postal codes).
  4. 4. HOW DOES GEOCODING WORK?Address Interpolation:
  5. 5. HOW DOES GEOCODING WORK?Other Techniques:
  6. 6. ADVANCEMENTS IN GEOCODING THEN
  7. 7. ADVANCEMENTS IN GEOCODING NOW
  8. 8. WHY DOES NCES GEOCODE SCHOOLADDRESSES? To support spatial analysis and provide geographic context to a schools location  Geocoded schools can be overlaid with other geographic layers such as:  School Districts  Locale Codes  Counties  Congressional Districts  And more…
  9. 9. LOCATION MATTERS
  10. 10. HOW TO PREPARE DATAInvest in your address data quality and check for errors before you begin:  Spelling  Numeric address ranges  Missing information
  11. 11. IMPLICATIONS OF GEOCODING ERRORS Accuracy of geocoding dictates quality of research Schools geocoded incorrectly can mean lost funding Unable to respond to an emergency appropriately
  12. 12. HOW TO PREPARE DATAFormat it in a style that the geocoder can handleUse the locational address, not the PO Box orAdministrative address of the school
  13. 13. HOW TO PREPARE DATABad: FMLY CHLD CTR 1411 LNCLNWY W, MISHAWAKA, IN,46544
  14. 14. HOW TO PREPARE DATAGood: 1411 LINCOLN WAY WEST, MISHAWAKA, IN, 46544
  15. 15. SELECTING A GEOCODE SOLUTION Things to consider:  Budget  Number of Records  Infrastructure  Number of Individuals Needing Access  Frequency of Geocoding  Sensitivity of Data
  16. 16. 1ST APPROACH: LOCAL/INTERNAL Datacenter Economy of and/or Scale Cloud Services Millions of Sensitive addresses Data In House
  17. 17. GEOCODING ON THE DESKTOP Prerequisites  ArcGIS Desktop Basic  Prepared Address Table  Reference Data (NAVTEQ, TOM TOM, TIGER)  Address Locator (Composite)
  18. 18. ON THE DESKTOP – COMPOSITE LOCATOR Multiple locators used in a cascading fashion Address • Best Match Match Street • Decent Centroid Match Match Zip Code • Acceptable Match Match
  19. 19. ON THE DESKTOP – USER INTERFACE
  20. 20. ON THE DESKTOP - OPTIONS
  21. 21. ON THE DESKTOP - OUTPUT
  22. 22. ON THE DESKTOP SUMMARY Great way to go if software and reference data is already in-house Can geocode more than 350,000 addresses per hour Data maintenance and support No custom development required
  23. 23. 2ND APPROACH: GEOCODING WEBSITES Excel and Points on a Web Map Browser Hundreds Publicly of address available at a time data Geocoding Websites
  24. 24. GEOCODING WEBSITES: Single Address Look Ups:  ArcGIS Online - http://www.arcgis.com/home/webmap/viewer.html  http://geocoder.us/  http://itouchmap.com/latlong.html  https://webgis.usc.edu/Services/Geocode/Default.aspx Batched or Multiple Address Look Ups:  ArcGIS Online - http://www.arcgis.com/home/webmap/viewer.html  http://batchgeo.com/  http://www.gpsvisualizer.com/geocoder/
  25. 25. ARCGIS ONLINE – SINGLE ADDRESS
  26. 26. ARCGIS ONLINE – MULTIPLE ADDRESSES
  27. 27. ARCGIS ONLINE – MULTIPLE ADDRESSES
  28. 28. ARCGIS ONLINE – MULTIPLE ADDRESSES
  29. 29. 3RD APPROACH: WEB APIS Publicly Accessible Data Hundreds to Custom Thousands of Development addresses at Required a time Web APIs
  30. 30. GEOCODING APIS AVAILABLE FORCUSTOM DEVELOPMENT  ArcGIS Online  Yahoo  Bing  Google  MapQuest  Geonames Be sure to read the terms of service and know the limitations. For example, when using Google, you must display your results on a Google map. Google limits requests to 2,500 addresses, etc.
  31. 31. GEOCODE RESULTS  The Hit Rate is the number of addresses that are geocodable  The Match Scores tell you what level of accuracy a particular address was geocoded. - Country - Region (state, province, prefecture, etc.) - Sub-region (county, municipality, etc.) - Town (city, village) - Post code (zip code) - Street - Intersection - Address - Premise or Roof Top
  32. 32. HIT RATES AND MATCH SCORES No Matches Found
  33. 33. HIT RATES AND MATCH SCORES Zip Code Centroid
  34. 34. HIT RATES AND MATCH SCORES Street Name Found
  35. 35. HIT RATES AND MATCH SCORES Street Address Found
  36. 36. HIT RATES AND MATCH SCORES Address Point Found (Highest Accuracy!)
  37. 37. OTHER OPTIONS - PLACEFINDERS
  38. 38. OTHER OPTIONS – REVERSE GEOCODING
  39. 39. DEMO – SDDS GEOCODING PROTOTYPE
  40. 40. WHAT ARE LOCALE CODES?
  41. 41. WHAT ARE LOCALE CODES? Read more: http://nces.ed.gov/ccd/rural_locales.asp
  42. 42. SCHOOL BOUNDARY PROJECT Project Background  350largest districts already collected  1000+ collected by the end of the year  That’s over 50% of students
  43. 43. SCHOOL BOUNDARY PROJECTWhere to find the data Can be downloaded from SDDS Standard Map Viewer.
  44. 44. WHAT’S NEW IN SDDS MAPVIEWER  Map Viewer Standard  Census 2010  ACS 5yr Estimate 2006- 2010  Public School Boundaries  Middle  Elementary  High Promise Neighborhood  Schools  Map Viewer Mobile  Migration to GEOCLOUD http://nces.ed.gov/surveys/sdds/index.aspx
  45. 45. Q&A
  46. 46. FOR MORE INFORMATION: Tai Phan Adrienne Allegretti Tai.Phan@ed.gov aallegretti@blueraster.com 202-502-7431 703-842-0171 www.blueraster.com blog.blueraster.com

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