Wisconsin Society of Land Surveyors

Providing Support and Professional Development for Land Surveyors since 1952


WisDOT GPS on BM status.

19 Jul 2021 11:04 AM | FRANCIS R THOUSAND (Administrator)

WisDOT GPS on BM status Map:  https://wisdot.maps.arcgis.com/apps/webappviewer/index.html?id=9f00da9c32da4e519bd035591abc09c9

NOTE THAT WE ARE AWARE THAT THERE ARE ISSUES WITH THE DISPLAY OF THE HEXAGONS ON THE ABOVE MAP.  It is an issue on NGS side, we are working to get it resolved.  Only hexagons are affected, the completed stations and number of station observations are unaffected.

In the Wisconsin Height Modernization (WI-HMP) Program, there are approximately 5,288 Vertical only stations and 3,553 stations with a Horizontal component for a total of 8841 stations

WisDOT has performed many additional observations that do not yet appear on the NGS OPUS share map nor GPS on BM PRIORITY MARK LIST below

OPUS Share Solutions per NGS OPUS share Dashboard (Based on Observation Date)

Shared Observations prior to Sept, 2020         66

Shared Observations September, 2020             62

Shared Observations October, 2020                101   

Shared Observations November, 2020               111   

Shared Observations December, 2020               145   

Shared Observations January, 2021                102    

Shared Observations February, 2021               100   

Shared Observations March, 2021          214    (Updated since last report)    

Shared Observations April, 2021                  200    (Updated since last report)    

Shared Observations May, 2021                    222    (Updated since last report)    

Shared Observations June, 2021                   120

Total                                                   1443

                                                

Notes

  • All shared observations by WisDOT and Partners
  • May include non-WI-HMP stations

Date

Total Shared Observations

September 8, 2020

65

December 3, 2020

157

January 4, 2021

345

February 1, 2021

430

March 1, 2021

606

April 1, 2021

755

May 1, 2021

971

June 1, 2021

1143

July 6, 2021

1443


10 Km NGS GPSonBM Hexagons Completed

NGS has divided the entire nation into a series of 10 Km hexagons.  One goal of the WisDOT’s GNSS Observation on passive stations project is to get one observation in every Wisconsin 10 KM hexagon.  There are 1833 hexagons in Wisconsin.  Hexagons that are DONE are a result of either an OPUS share station observation or a station submitted to NGS via Bluebooking within a hexagon.

WE ARE STILL SECOND IN THE NATION WITH A TOTAL OF 1083 10 KM HEXAGONS COMPLETED.  Minnesota has 2649 completed, Illinois has 977 and North Carolina has 731

 

GPS on BM PRIORITY MARK LIST (NGS)

NGS has produced a prioritized list of bench marks where additional GPS data would be helpful to help define the new 2022 Geoid model.  Providing GPS on stations with leveled elevations will help to relate the GPS derived ellipsoid height with the leveled elevation of these marks.  The stations on the Priority List are chosen by computer generated algorithms based on station location and metadata without regard to its status as a WI-HMP station.  Currently, there are about 15,000 NGS benchmarks (both WI-HMP stations and non WI-HMP) in Wisconsin.  Most non WI-HMP stations have relatively little current survey value, but may have important older surveys tied to them.

 

Date

Number of stations on list

Number of stations Completed

Percent of NGS Priority Marks Completed

Percent Completed of 3553 Horizontal WI-HMP Stations

9/8/2020

2968

674

22.7%

19.0%

11/30/2020

3162

806

25.5%

22.7%

1/11/2021

3284

891

27.1%

25.1%

2/11/21

3395

949

28.0%

26.7%

3/1/21

3622

1054

29.1%

30.0%

4/1/21

3718

1107

29.8%

31.2%

4/28/21

4033

1272

31.5%

35.8%

5/24/21

4205

1397

33.2%

39.3%

6/29/21

4455

1565

35.1%

44.0%

Notes

  • Not all Wi-HMP stations are currently on the BM PRIORITY MARK LIST
  • The vast majority of observations are on WI-HMP horizontal stations, but not all.
  • NGS adds additional stations to the BM PRIORITY MARK LIST after certain stations are observed
  • BM PRIORITY MARK LIST Spreadsheet typically updated once a month


ORIGINAL HARN STATIONS (OR REPLACEMENTS) DONE  One goal of the WisDOT’s GNSS Observation on passive stations project is to get two observations on all original HARN stations or their replacements in Wisconsin.  There are 80 Stations in total.  The original HARN stations are a higher accuracy station and provided the initial control from which all other horizontal stations in Wisconsin were surveyed from.

Date

HARN Stations Completed

% Completed

March 1, 2021

49

61.3%

April 1, 2021

53

66.3%

May 3, 2021

59

73.8%

June 3, 2021

60

75.0%

July 6, 2021

69

86.3%

Remaining (10):  ARCADIA GPS Trempealeau Co, DURAND GPS (Pepin Co), EXELAND GPS (Sawyer Co), FOND DU LAC GPS (FdL Co), HAYWARD GPS (Sawyer Co), JANESVILLE GPS (Rock Co), MANITOWISH WATERS GPS (Vilas Co), RHINELANDER GPS AZ MK (Oneida Co), SHEBOYGAN FALLS GPS RESET (Sheb Co), WEST BEND GPS (Washington Co).  MILWAUKEE GPS has been destroyed.

 

List of Non-WisDOT Partners (that I am aware of) that have or are planning to submit OPUS Share observations

J.W. Austin Associates of Minocqua, Vernon County, LaCrosse County, Dodge County, Dunn County, Brown County, Sheboygan County, Washington County, Burnett County, Manitowoc County, Jackson County, Clark County, Sawyer County, Washington County, Oneida County, Washburn County, Lincoln County, City of Madison, Landtech Surveying of Oconomowoc, Seiler Instruments, Leica Geosystems, Milwaukee Metropolitan Sewerage District, Northeast Wisconsin Technical College (NWTC),


Mick

Mick Heberlein, PLS, PS, CFedS

WisDOT, Office of Surveying & Mapping

3502 Kinsman Blvd

Madison, WI   53704-2549

Ph. 608-243-5994         FAX 608-245-8959

Personal E-mail: mick.heberlein@dot.wi.gov

To report disturbed or destroyed geodetic monuments

Tel. 1-866-568-2652

email: mailto: geodetic@dot.wi.gov

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