MDOT CORS

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MDOT CORSM.H.M.PAndy Semenchuk, P.S.MSRN
ADMINISTRATOR
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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

• CORS

• HARN

• MHMP

• FBN

• CBN

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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

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MDOT CORS

• First step in a in creating a Homogeneous 3D
  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!!!

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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/crewThe Road budget has
  quadrupled in the same time frame.
• We had to get the work out.

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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.

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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.

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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.

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Managements 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.

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

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SITE PHOTOS
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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.

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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.

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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

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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 3rd 5.5 hour session.
• This observation also served as the
  re-observation of the HARN.

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Cooperation

• success

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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
• County Expansion
• City Expansion
• Emergency/ Utilitarian expansion
• Phase II (Real-Time Broadcasting)
• In Planning
• Real-time PCS
• Policy for City/ County additions to network
• Phase III
• The future

• IN PROGRESS

• IN PROGRESS

• HEIGHT MODERNIZATION

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Why Height Modernization?

• We already have the 2D dimensional component
  (MSRN) in place why not add the height component
  and have a 3D 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

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MHMP

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

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

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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 re-bar.
• Monuments will be located Approximately 1.8km 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.
• Obstructions shall be kept to a minimum
• Foresight to future usage shall also be kept in
  mind.

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2nd Order Class 1 leveling

• All 2nd 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 ATVs are recommended where permitted
  to increase productivity.

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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.
• Low bid/QBS contract
• Total number will be dependent on BID amount for
  monuments and on the number of recoveries of
  existing control.
• 50 success rate in recoveries.
• Scope for leveling and GPS needs to be created.
• Contract will be issued in the spring
• can not commence till monument placement is
  complete.
• IDS pre-qualified contract
• Pilot Must be completed by 9/1/06

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PARTNERS?

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

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Questions???