MDOT CORS M H M P Andy Semenchuk

MDOT CORS & M. H. M. P Andy Semenchuk, P. S. MSRN ADMINISTRATOR

A review of definitions ± : continuously operating reference station ° What is it? A permanently mounted GPS receiver. ± ± : High Accuracy Reference Network : Michigan Height Modernization Project ± ± : Federal Base Network : Cooperative Base network

What is a Reference/ Base Station Defined by “Webster” ± ref • er • ence, n. , 1. referred or consulted as a centering point ± base, n. , 1. the fundamental part or foundation ± sta • tion, n. , 1. a place or position where something is to remain 2. a place equipped for some particular kind of work, service, or broadcasting

MDOT CORS ± First step in a in creating a Homogeneous 3 D geodetic network in the state. ± First CORS installed in Jackson, Michigan on September 2000. ± CORS system was originally installed by MDOT for our own use. ± Today it has become similar to a public road. °Available to everyone at no cost!!!

MDOT CORS BACKGROUND ± Department had been using GPS for static and rapid static control work since 1991. ± MDOT used to have 38 crews state wide with each crew containing 8 people. ± Today there are 8 crews statewide with no more than 2 to 3 person/crew The Road budget has quadrupled in the same time frame. ± We had to get the work out.

Behind the Eight Ball ± The Survey and Photogrammetry Units were understaffed and ill prepared for the magnitude of requests we receive. ± We did not possess the staff nor technology to complete the work. ± The end result was the inability to deliver our product to our customer in a timely manner.

Search For Solutions ± We needed to develop solutions for the situation. ± Our goal: To produce accurate survey and photogrammetry data quicker and more efficiently. ± We looked at several areas of our process: § survey request timing § Consultant contact scoping improvements § Application of new technology to improve the actual process of surveying. The Earl of Cone

CORS BECAME A REALITY ± We investigated different methods to get the work out and realized that we were spending lots of hours bringing control to a project. ± We decided to implement a reference network across the state that would assist us in the control process. ± The next step was to “Sell” the idea to the management at MDOT.

Management’s Concerns ± Management was rightly concerned with the following: °Is this technology proven? °What will be the overall costs? °What will be the costs savings to the department? °How long before we recoup our initial investment? ± After satisfying managements concerns, they gave us the go ahead.

The Michigan Spatial Reference Network (56) Fifty six GPS receivers 6 more waiting for spring thaw. Lets open the door and see a bit Located at various more about this network MDOT and county faciltites. RTK (RTCM) Available VIA WEB All controlled by Spider. NET software. Jackson “UNIV” Station

Building the Monuments ± We researched and consulted with Structural and mechanical engineers to try and build stable monuments for the conditions we encounter in Michigan. ± We decided and a 2 part mount. °The base consisting of a reinforced concrete monument 24” in diameter by 12 feet below grade. °And the mast which is know commonly known as an “Earlconic”.

SITE PHOTOS Cable Trench Looking in the monument hole. Waiting for the concrete.

Site Selection. ± The first 12 sites we had planned were selected on the following criteria. ° Must be on MDOT property ° Must have had an existing dedicated LAN connection. ° Must have met visibility requirements and suitable soils for stability.

Completion of Initial stations ± The initial stations were installed in a 3 month period. ± During this 3 month period we decided to implement a user interface to access the data. °www. mdotcors. org was born. °In its 5 years of existence we have had over 30, 000 downloads for the data. °This does not include the people who get the MSRN data directly from NGS.

Positioning the CORS ± We then decided to position the CORS relative to the HARN. ± We mobilized the MDOT survey forces and discovered that we needed help. ± We asked for volunteers and the response was overwhelming: °Dept. of Natural Resources °Private sector stepped up to the plate °Ferris State University Students

Positioning CORS ± We had originally planned 2 5. 5 hour sessions to position the CORS. ± After discussing with NGS we revised the sessions to create a 3 rd 5. 5 hour session. ± This observation also served as the re-observation of the HARN.

Cooperation PRIVA TE SECTO R Local Gov. Agencies other State Agencies `

Phase Description ± Phase I (Real-Time Data Acquisition and Integrity Monitoring) ° Deploy network of Static Stations ° Operational Testing ° Public Access (User training/ Workshops/Seminars ° MDOT Expansion ² County Expansion ² City Expansion ² Emergency/ Utilitarian expansion ± Phase II (Real-Time Broadcasting) ° In Planning ° Real-time PCS ° Policy for City/ County additions to network ± Phase III ° The future

Why Height Modernization? ± We already have the 2 D dimensional component (MSRN) in place why not add the height component and have a 3 D geodetic control network in the state? ± Other Benefits ° Land Surveying ° Land Use Planning ° Property Descriptions ° Great Lakes monitoring ° Floodplain Mapping ° Environmental Applications ° Precision Agriculture ° Precision GIS base mapping ° Navigation

MHMP ± Goals °Eliminate inconsistencies in the vertical network ²Result will be a homogeneous vertical network °Replace and supplement control in High growth areas where control has been destroyed. °Statewide 3 D Control Network. °Further enhance RTK.

± Phase Description ° Phase 1 ²Define a pilot area ²Secure funding through state funds and Federal highway research funds. ²Complete pilot project area using consultant forces. Ù 2 PHASES (2 separate contracts) ¤ Monument Placement ¤ 2 nd order class 1 Leveling and GPS ²Report Results. ° Phase 2 ²Secure Congressional funding. Ù Can be officially called “height modernization” ²Ongoing until state is completed (long term) Ù 10 year window for completion.

What is involved with Monument placement ± Monuments ° Poured concrete 16” Diameter by 8’ in depth ° Monument will be re-enforced with 4 pieces of fiberglass rebar. ° Monuments will be located Approximately 1. 8 km to 2 km apart along the designated route. ° Monuments will be located as much as possible in areas that will give the longest monument life. ° 95% of monuments should be located in areas suitable for GPS purposes. ²Obstructions shall be kept to a minimum ²Foresight to future usage shall also be kept in mind.

2 nd Order Class 1 leveling ± All 2 nd order class 1 specs must be followed. ± Collimation performed daily ± 60 meter maximum backsight ± Backsights and foresight must be balanced. ± Double observe each section under different circumstances. ± Use turning pins (turtles) and Rod supports. ± The use of ATV’s are recommended where permitted to increase productivity.

Where are we today? ± Contract for monument placement will be released in the upcoming month. ° Consists of placement of monuments in Macomb, Wayne, St. Clair, and possibly Oakland Counties. ²Low bid/QBS contract ² Total number will be dependent on BID amount for monuments and on the number of recoveries of existing control. Ù 50% success rate in recoveries. ± Scope for leveling and GPS needs to be created. ° Contract will be issued in the spring ² can not commence till monument placement is complete. ² IDS pre-qualified contract ± Pilot Must be completed by 9/1/06

PARTNERS? ± We need partners at local level to achieve the same level of success as with the MSRN. ° Partnering does NOT mean $ commitment. ²Different forms of Partners Ù Time Ù Resources Ù Talent Ù Education Ù Preservation ± If Stakeholders participate in the process it will almost ensure a successful program.

Questions? ? ?