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Low Distortion Zones (WISCRS)

Low Distortion Zones (WISCRS). Plan A – WISCRS, as is. Discovery Team vision (August, 2018). TFG charge, objectives, milestones (approved February, 2019). Plan B – WISCRS with modified false northings and false eastings. Selected at June 19, 2019 TFG and focus group leads meeting.

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Low Distortion Zones (WISCRS)

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  1. Low Distortion Zones (WISCRS) • Plan A – WISCRS, as is. • Discovery Team vision (August, 2018). • TFG charge, objectives, milestones (approved February, 2019). • Plan B – WISCRS with modified false northings and false eastings. • Selected at June 19, 2019 TFG and focus group leads meeting. • Preliminary work has been done.

  2. Low Distortion Zones (WISCRS) • Plan C – WISCRS with false northings and eastings that absorb datums shifts to NATRF2022 and perhaps scale factor that absorbs Survey feet to International feet. • Briefly discussed at June 19 meeting. • Discussion without depth or advocacy. • Plan D – Complete redesign using data and tools not available in either 1995 (WCCS) or 2005 (WISCRS). • Might be able to reduce number of zones (no guarantee). • Might be able to meet more NGS specifications (no guarantee).

  3. NAPGD2022

  4. NAPGD2022 • Considerations: • Versioning and time-dependency. • Legacy, on-going project, and future vertical control. • Legacy, on-going project, and future topographic maps and surface models (e.g.,TINs and DEMs). • Regulatory and administrative maps. • Navigation systems (aerial, marine, terrestrial). • More…….

  5. NAPGD2022 • Questions: • How deep should WSRS2022 Task Force go with this (i.e., scope)? • What are the roles of each Focus Group?

  6. My Left U.S. Survey Foot • NGS wants to make the U.S. Survey Foot go away in favor of the International Foot. • Have NIST adopt International Foot standard after notice in Federal Register. • 2 ppm (0.01 ft per mile) difference. • Negligible for most project-based distances. • Not negligible when using coordinates over larger extents.

  7. My Left U.S. Survey Foot • Long history about two different foot measures being used in the U.S. • Confusion will prevail unless the geospatial community understands and plans well. • There are legal issues: • Cadastral surveying and mapping / property conveyancing. • Wisconsin has legislation that specifies the U.S. Survey Foot. • How to best address this issue?

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