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2005 Statewide Orthophotography Control February 20, 2008 Indiana GIS Conference

2005 Statewide Orthophotography Control February 20, 2008 Indiana GIS Conference. By Ryan C. Swingley, LS USI Consultants Thomas A. Mahon, PE, LS Woolpert Inc. Prime Consultant - EarthData Photo Firms Earth Data Woolpert Horizons Northwest Geomatics Survey Firms Woolpert

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2005 Statewide Orthophotography Control February 20, 2008 Indiana GIS Conference

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  1. 2005 Statewide Orthophotography ControlFebruary 20, 2008Indiana GIS Conference By Ryan C. Swingley, LS USI Consultants Thomas A. Mahon, PE, LS Woolpert Inc

  2. Prime Consultant - EarthData Photo Firms Earth Data Woolpert Horizons Northwest Geomatics Survey Firms Woolpert USI Consultants Accu-Air Project Team

  3. Imagery intended to assist agencies at all levels of government To be used to assist with homeland security, economic development, tax assessment, highway planning, environmental monitoring, and crime statistics, to name a few more Seven aircraft to collect 50,000 images over two months flying seven days per week State funded 12” pixel imagery Counties could “buy-up” to 6” imagery Project Overview

  4. Flying Started February 18, 2005 Flying Initially Ended April 15, 2005 (two weeks ahead of schedule) Initial Re-flights Ended May 28, 2005 Ground Control Started 03/24/05 Ground Control Ended 05/02/05 Final Ground Control Coordinates delivered 05/31/05 (one week early) Project Overview

  5. Project Overview Cont’dProposed Blocks

  6. Leica ADS40 made project possible because It can be flown higher It can be flown faster It requires less ground control (IMU) It uses multiple sensors allowing data capture in a single pass It is all digital Technology

  7. Original contract expected 12/31/04 Contract delayed approx. 2 mos. Delay reduced planning time Waiting for targets would have delayed flights Schedule could not slip Targets were out, photo ID was in What is meant by Photo ID? Impact of Schedule

  8. Flight plan Target locations Tolerances Place targets and control Leave targets in place until film QC’ed Pick up targets Or use photo ID Normal Photo Control

  9. Normal Photo Control

  10. Flight plan – Provided by ED Tolerances – Provided by ED No targets, “photo ID” 6” Pixel control may move up to 500’ from intended location 12” pixel control may move up to 2,000’ from intended location Statewide Photo Control

  11. Proposed Control

  12. Horizontal and Vertical Requirements for Control Photo-identifiable points must be clearly visible from the air Points must have sufficient definition Examples Right-angle intersections of sidewalks Intersections of b-ball court stripes Corners of stop-bars and chevrons Performance Specifications

  13. 6” Pixel Photo-ID Points Horizontal Accuracy: 0.5’ Vertical Accuracy: 0.15’ Maximum Shift: 500’ 12” Pixel Photo-ID Points Horizontal Accuracy: 1.0’ Vertical Accuracy: 0.3’ Maximum Shift: 2,000’ Performance Specs Cont’d

  14. Two baselines per point Minimum observation time is equal to distance to second furthest base station, measured in km, plus five, expressed in minutes (i.e., 25 km to second furthest base station requires minimum of 30 minute observation time) when a minimum of six satellites are available (PDOP < 4.0) Observation Criteria

  15. Field Equipment Trimble 4000 Trimble 5700 Trimble 5800 All L1 / L2 Receivers Field Procedures

  16. Navigation Recreational GPS hand held DeLorme Street Atlas Field Procedures

  17. Communications and Planning Morning and Evening Discussions ID and Control Assignments by the Field Manager Cell phone through out the day Field Procedures

  18. Field Notes Field Procedures

  19. Field Notes Field Procedures

  20. GPS Data, Photos and Transcribed Field Notes were downloaded and post to FTP site nightly Field Procedures

  21. Target #125 on Ky Side of Evansville Challenging Targets

  22. Drift Wood Target #125 Challenging Targets

  23. Target 101 Near Confluence of the Wabash and Ohio Challenging Targets

  24. Target 101 Near Confluence of the Wabash and Ohio Challenging Targets

  25. Stop Bars Good Targets

  26. Edges of Concrete Good Targets

  27. Good Considering the Area Good Targets

  28. Sometimes we got lucky Good Targets

  29. All GPS Network Adjustments were within tolerance All AT Solutions were good Blind QC Points were good Rensselaer checks good Withstanding the Scrutiny of QC

  30. UTM Zone 16/NAD83(97) in meters & State Plane Coordinates, east or west zone, US Survey Feet 11th Hour Switch to NAD83(86) NAD83(97) to NAD83(86) shift: N = 4”, E = 9”, Hz = 10” NAVD88 to NGVD shift:  4.7” Final Control Deliverable

  31. Final Control Deliverables

  32. Huntingburg Airport and airborne support The only Trimble 4000 SSE that logged data at 0.2 Hz Flying in Kosciusko County, Controlling in Dubois County Ryan’s first day Horror Stories

  33. IUCO IndySV Google Earth Success Stories

  34. Google Earth Success Stories

  35. Questions? Comments? 2005 Ortho Control

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