My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
11-22-2021 SS Briefings
>
Meetings
>
2021
>
11. November
>
2021-11-22 1:30 PM - Public Works Study Session
>
11-22-2021 SS Briefings
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
11/19/2021 6:33:18 PM
Creation date
11/19/2021 9:34:04 AM
Metadata
Fields
Template:
Meeting
Date
11/22/2021
Meeting title
Public Works Study Session
Location
Commissioners' Auditorium and Webex
Address
205 West 5th Room 109 - Ellensburg
Meeting type
Regular
Meeting document type
Supporting documentation
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
14
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
KITTITAS COUNTY <br /> DEPARTMENT OF PUBLIC WORKS <br /> PUBLIC WORKS—BOARD OF COUNTY COMMISSIONERS <br /> STUDY SESSION STAFF REPORT <br /> STUDY SESSION DATE: November 22, 2021 <br /> TOPIC: New Datums Replacing NAV D 88 and NAD 83 <br /> ACTION REQUESTED: Support Staff Efforts <br /> LEAD STAFF: <br /> Mark R. Cook <br /> RECOMMENDATION: <br /> Complete updating National Geodetic Survey monuments to the maximum extent <br /> possible before year's end. <br /> BRIEFING SUMMARY: <br /> • The National Geodetic Survey is switching the nation's datums and reference <br /> system in 2022. <br /> • For the past eleven months, County Surveyor Turnbull and his team have been <br /> updating NGS monument data countywide. <br /> • In the state of Washington, Kittitas County and Yakima County lead the state in <br /> the monument revisiting effort. <br /> • A large GIS effort is needed responding to pending changes in the nation's datum <br /> and geospatial reference systems. <br /> • Once this round of NGS updating is complete, all of the past five years of Public <br /> Works monument data updating will tie back making improvements to the <br /> County's tax parcel layer possible. <br /> BACKGROUND: <br /> To improve the National Spatial Reference System (NSRS), NGS will replace all three <br /> North American Datum of 1983 (NAD 83) frames and all vertical datums, including the <br /> North American Vertical Datum of 1988 (NAVD 88), with four new terrestrial reference <br /> frames and a geopotential datum. <br /> The new reference frames will rely primarily on Global Navigation Satellite Systems <br /> (GNSS), such as the Global Positioning System(GPS), as well as on a gravimetric geoid <br /> model resulting from our Gravity for the Redefinition of the American Vertical Datum <br /> (GRAV-D) Project. <br /> These new reference frames will be easier to access and to maintain than the current <br /> NSRS, which relies on physical survey marks that deteriorate over time. <br /> Page 1 of 4 <br /> Public Works"Work Session Staff Report",2021 <br />
The URL can be used to link to this page
Your browser does not support the video tag.