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MDOT CORS

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Department had been using GPS for static and rapid static control work since 1991. ... Application of new technology to improve the actual process of surveying. ... – PowerPoint PPT presentation

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Title: MDOT CORS


1
MDOT CORSM.H.M.PAndy Semenchuk, P.S.MSRN
ADMINISTRATOR
2
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

3
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

4
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!!!

5
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.

6
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.

7
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.

8
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.

9
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.

10
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
11
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.

12
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13
SITE PHOTOS
14
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.

15
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.

16
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17
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

18
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.

19
Cooperation
  • success

20
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

21
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

22
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.

23
  • 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.

24
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.

25
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26
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.

27
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

28
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.

29
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