Low Distortion Zones WISCRS l Plan A WISCRS

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Low Distortion Zones (WISCRS) l Plan A – WISCRS, as is. – Discovery Team

Low Distortion Zones (WISCRS) l Plan A – WISCRS, as is. – Discovery Team vision (August, 2018). – TFG charge, objectives, milestones (approved February, 2019). l 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.

Low Distortion Zones (WISCRS) l Plan C – WISCRS with false northings and eastings

Low Distortion Zones (WISCRS) l Plan C – WISCRS with false northings and eastings that absorb datums shifts to NATRF 2022 and perhaps scale factor that absorbs Survey feet to International feet. – Briefly discussed at June 19 meeting. – Discussion without depth or advocacy. l 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).

NAPGD 2022

NAPGD 2022

NAPGD 2022 l Considerations: – Versioning and time-dependency. – Legacy, on-going project, and future

NAPGD 2022 l 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…….

NAPGD 2022 l Questions: – How deep should WSRS 2022 Task Force go with

NAPGD 2022 l Questions: – How deep should WSRS 2022 Task Force go with this (i. e. , scope)? – What are the roles of each Focus Group?

My Left U. S. Survey Foot l NGS wants to make the U. S.

My Left U. S. Survey Foot l 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. l 2 ppm (0. 01 ft per mile) difference. – Negligible for most project-based distances. – Not negligible when using coordinates over larger extents.

My Left U. S. Survey Foot l Long history about two different foot measures

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

Residual Stresses and Distortion Residual Stresses and DistortionResidual Stresses and Distortion Residual Stresses and Distortion
Distortion All maps have distortion What type ofDistortion All maps have distortion What type of
Fieldmaps and distortion Using fieldmaps to correct distortionFieldmaps and distortion Using fieldmaps to correct distortion
DATA COMMUNICATION PRINCIPLES Delay Distortion Delay Distortion ADATA COMMUNICATION PRINCIPLES Delay Distortion Delay Distortion A
Approximation Algorithms for Low Distortion Embeddings into LowApproximation Algorithms for Low Distortion Embeddings into Low
Low Distortion Projection Tools additions to the GeodeticLow Distortion Projection Tools additions to the Geodetic
Low Distortion Projections with GISt a Little BitLow Distortion Projections with GISt a Little Bit