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Presentation by Drew Decker & Carol Ostergren, U.S. Geological Survey

Presentation by Drew Decker & Carol Ostergren, U.S. Geological Survey

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  • This is a DRAFT presentation. Elizabeth McCartney emccartney@usgs.gov
  • In light of swiftly changing technical landscapes and increasing uses of social networking, the USGS is exploring a new approach to the volunteer program. TheUSGS launched a project to test options for volunteer participation in providing data to The National Map.The project involves mapping man-made structures and facilities, such as schools and fire stations. Using an internet mapping application, volunteers help the USGS update The National Map by correcting or adding information about structures.
  • Over the past two decades, the USGS National Geospatial Program has sponsored various forms of volunteer map data collection projects. Volunteers helped the USGS improve its maps during this period by annotating paper maps, collecting data using GPS units, and submitting data using a web-based tool.Earth Science CorpsEstablished in 1994“Adopt-a-quad”1995-2001- 3300 volunteers identified and annotated between 100 and 300 paper maps each yearProgram renamed The National Map Corps in 2001Program emphasis shifted from annotating every feature on published maps to collecting data on built structures in the US using hand-held GPS units.2003-2006- approx. 22,800 data points submitted by over 1000 volunteers. Submitted in various forms- spreadsheets, emails, handwritten pages of notes2006- web-based tool launched2006-2008- used by 401 volunteers to submit 3847 points which were stored in a database.2008- Suspended due to funding limitations
  • OSMCP is Open Street Map Collaborative Project2011 Pilot project for Denver added up to 30 structure types; we’ve settled upon ten for the national effort
  • There are 4 measurements of quality we use to evaluate the data. Attributes, Spatial Position, Errors of Omission (missing), and Errors of Commission (Errors of commission are sometimes also called "false positives." They refer to instances in which someone or something is erroneously included for consideration when they or it should have been excluded – from Encyclopedia of Survey Research Methods, http://srmo.sagepub.com/view/encyclopedia-of-survey-research-methods/n164.xml).ESRI Data Reviewer was used to select a random sample of points. Using a confidence level of 95% and a margin of error of 10%, 100 points were randomly selected. ESRI’s data reviewer uses this standard formula: Z^2 x p x (1-p) Sample size = ----------------------- M^2 whereZ = Z value (e.g., 1.96 for a 95% confidence interval)p = Estimated incidence of the characteristic of interest in the population, expressed as a decimal percent (e.g., 0.3=30%). 0.5 maximizes the value p(1-p), so is commonly used as a default.m = acceptable margin of error, expressed as a decimal (e.g., 0.10 = + 10%)This is consistent with, though not quite identical to, normal NGTOC procedures for certifying structures obtained from contractors and partners for the National Structures Dataset (USGS, 2012), which follow classic data quality measures used in the mapping community (Goodchild, 2007).The sampling check included with Data Reviewer allows you to create a sample set of features that are randomly selected from one or more layers. A number derived from a calculation based on the confidence level, margin of error, and acceptance level.*** If we randomly check 94 structures records, our sampling will be 95% confident that our finding are correct 85 to 100% of the time.  This calculator uses the following formula:Sample size = Zsq * (p) * (1-p)/CsqwhereZ = Z value (e.g., 1.96 for a 95% confidence interval)p = percentage of picking a choice, expressed as a decimal (.5 used for sample size needed)C = confidence interval (e.g., .08 = + 8)
  • We have worked with university students, retirees, Boy Scouts, Former TNMCorps members, High Schools, 4-H.
  • The top 10% of volunteers have contributed 82% of the points (not including deletions). A typical distribution of volunteer-driven data collection – Wikipedia, Open Street Map, Ponzi Scheme.Power-Law Distribution Wikipedia: A power law is a mathematical relationship between two quantities. If the frequency (with which an event occurs) varies as a power of some attribute of that event (e.g. its size), the frequency is said to follow a power law. For instance, the number of cities having a certain population size is found to vary as a power of the size of the population, and hence follows a power law.the ratio of contributions to users follows what's called a power-law distribution.WikipediaNorth American Bird Phenology Program out of Patuxent Wildlife Research CenterTranscribe Bentham project 137 Volunteers total Picture by Hay Kranen / PD
  • As an incentive, volunteers who completed their assignment received a certificate of achievement from the USGS
  • The National Map Corps web site explains the project objectives, shows how to perform edits and provides links to all relevant information. Most volunteers will be able get started volunteering for The National Map Corps by simply exploring this web site. The National Map Corps web site is located at https://my.usgs.gov/confluence/display/nationalmapcorps/HomeWe have worked with university students, retirees, Boy Scouts, Former TNMCorps members, High Schools, 4-H.
  • To expand the project this is what we have to do


  • 1. U.S. Department of the Interior U.S. Geological Survey VGI Project Team: Elizabeth McCartney, Erin Korris, Joe Pantoga, Morgan Bearden, Somayeh Nasrollahi tari, Greg Matthews http://nationalmap.gov/TheNationalMapCorps nationalmapcorps@usgs.gov CROWDSOURCING THE NATIONAL MAP The National Map Corps VOLUNTEERED GEOGRAPHIC INFORMATION AT USGS
  • 2. Outline • History of volunteered geographic information (VGI) at the USGS • Volunteer Activity – Earth Science Corps…National Map Corps • Pilot Projects-FY10-FY12 • Expansion to All 50 States – April 2013 • Future Developments • Trails • Mobile Application • Vector Web Editor
  • 3. History of VGI At The USGS
  • 4. Revival of VGI at The USGS 2010: • USGS VGI Workshop • OSMCP Phase 1- Roads in Kansas with GIS professionals 2011: • OSMCP Phase 2- Structures with Students, 4 quads over Denver 2012: • Phase 3, The National Map Corps – Structures in Colorado open to all volunteers
  • 5. U.S. Department of the Interior U.S. Geological Survey The National Map Corps Structures ProgramStructures Program Edit Peer Review VOLUNTEERSVGI Processing - Take data and make it better - Find missing data - Fix spatial location - Fix attributes -Verify existing structures Existing Structures -Come from GAZ database - Come from Structures DB Structures Processing - Integrate data back to GAZ - Reconcile with Structures DB - Make available for -The National Map - US Topo Structures Data Program GazVector Structures Processing - GAZ ID’s - Metadata - Abbreviations - Etc Structures Data Program GazVector The National Map USGS QA Workflow
  • 6. National Expansion • School • College/University • Fire Station/EMS • Law Enforcement • Prison/Correctional Facility • State Capitol • Hospital/Medical Center • Ambulance Service • Cemetery • Post Office http://navigator.er.usgs.gov/help/vgistructures_userguide.html
  • 7. May 5, 2013
  • 8. July 3, 2013
  • 9. August 5, 2013
  • 10. September 5, 2013
  • 11. November 13, 2013
  • 12. December 2, 2013
  • 13. January 15, 2014
  • 14. February 20, 2014
  • 15. Volunteers
  • 16. Users Points Power Law (long tail) Distribution Typical of VGI
  • 17. Marketing • Marketing Team: Pat Phillips, Mark Newell, Allyson Jason, Ron Wencl, Erin Korris, Elizabeth McCartney • Liaison Network, Office of Communications, Office of External Communication, TNMCorps • News Releases • Circulars, OFRs • Gamification Techniques • Social Media Gold Medal Best Marketing or Promotional Program
  • 18. Social Media
  • 19. Volunteer Recognition - Badges Order of the Surveyor’s Chain (25-49) Society of the Steel Tape (50-99) Circle of the Surveyor’s Compass (200-399) Stadia Board Society (500-999) Alidade Alliance (1000-1999) Pedometer Posse (100-199) Theodolite Assemblage (2000 +) http://navigator.er.usgs.gov/help/vgistructures_rewards.html
  • 20. Web Editor
  • 21. • Viewer has “View” and “Editor” modes • Editors can either (1) edit existing structure features or (2) add new ones • Editing operations include changing structure locations and adding/changing names and addresses • Easy ID features (red needs edit; green done) • Can change image background and can easily undo changes or save work BASIC OPERATIONS
  • 22. Project Home Page https://my.usgs.gov/confluence/display/nationalmapcorps/Home
  • 23. Urban And Regional Information Systems Association GISCorps – Google Wiki https://sites.google.com/site/tnmcsite/new-home
  • 24. Moving Forward • Twitter • Trails • Mobile Applications • Next Generation Web Editor Follow us on Twitter: #tnmcorps http://nationalmap.gov/TheNationalMapCorps nationalmapcorps@usgs.gov
  • 25. Drew Decker US Geological Survey 4165 Spruance Road San Diego, CA 92101 619-225-6430 office 619-417-2879 cell ddecker@usgs.gov Carol Ostergren US Geological Survey CSUS – Placer Hall Office of the Regional Director 6000 J Street Sacramento, CA 95819-6129 916-607-8431 cell costergren@usgs.gov