Lorraine Wright

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Lorraine Wright

• Indiana Dept. of Environmental Management
• and
• INGISI - ITeam Representative
• Geodetic Control Framework Workgroup

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Indiana Geographic Information System (GIS)
Framework Layerswww.in.gov/igic

• Geodetic Control
• Hydrography
• Transportation
• Cadastral Information
• Digital Ortho-Imagery
• Elevation
• Boundaries/Governmental Units

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NGS Web site

• Http//mapindex.nos.noaa.gov/mapfinderHTML3/contac
  ts/contact.html
• NGS has future plans to allow easier access to
  NGS data via the web.
• Users will easily access the Geodetic Control
  data and use with their own GIS

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NGS- IN FBN Stations
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DNR Web Benchmarks by County
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IN HARN
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HARN - NW Indiana
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Existing A B Order Station
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Types of Geodetic ControlState

• IN Department of Natural Resources
• IN Department of Transportation
• IN Department of Environmental Management

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Public Land Survey System
Public Land Survey System
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Indiana Geological Survey Database for PLSS
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Local Control

• County section corners
• Drainage information
• Other County control

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Local Control

• Sections Corner data
• counties are in various stages of having their
  data available digitally
• some have web sites that show their local control
• some have control points in databases
• some have the section corner data sheets on paper
• some counties have a local reference system that
  is not tied to national datums

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Marion County control
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Bartholomew County data sheets - coordinates
based on local system of 10,000
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Barthlomew Co. AutoCADD drawings
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How can counties make their data available?

• Link to your data to the GIS Data Clearinghouse
  site www.in.gov/igic
• Scan paper records, photos, AutoCADD drawings of
  section corner information and attach to the IN
  Public Land Survey System file
• Create a state-wide database for all county data

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State of Washington Survey Control Data Warehouse
on the web
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Questionaire

• 1. What map Projection/Coordinate System do you
  use?
• Indiana State Plane
• Indiana State Plane West
• UTM
• Geographic
• Other
• Unknown

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Questionnaire

• 2. What unit of measure do you use?
• US Survey Feet
• International Feet
• Meters
• Other
• Unknown

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Questionnaire

• 3. What horizontal datumn do you use?
• NAD27
• NAD 83(86)
• NAD 83(97 HARN)
• Other
• Unknown

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Questionnaire

• 4. What vertical datumn do you use?
• NGVD29
• NAVD88
• Assumed
• None
• Other
• Unknown

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Questionnaire

• 5. Do you collect data with a GPS receiver?
• Yes
• No

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Questionnaire

• 6. If yes to 5, what grade receiver do you use?
• Survey
• Mapping
• Recreational
• PCMCIA Card

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Questionnaire

• 7. If yes to 6, are your reading differentially
  corrected?
• Yes
• No

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GPS units

• Create a data dictionary that contains the
  information requested on the Questionnaire
• Metadata When outputting the GPS data, create
  an output file with your
• data dictionary fields
• time
• data
• collector
• other

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Join the Workgroup

• Provide your comments!!

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Contol Data Set Columns

• Control Point ID
• County
• Control Point Name
• Township
• Range
• Section
• Latitude
• Longitude
• Elevation

• Section Location (ex. NE, North center)
• Control point type (ex. Section, property,
  drainage)
• Coordinate system (ex Projected or Geographic
  Coordinate System
• Datumn