supporting an accessible geodetic control network for california
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Supporting an Accessible Geodetic Control Network for California. A Growing Concern for the Geospatial, Land Surveying and Mapping Communities. Presented by: The California GIS Council's Geodetic Control Work Group ( CGWG ). Presentation Topics. Introduction of the GCWG . - PowerPoint PPT PresentationTRANSCRIPT
Supporting an Accessible Geodetic Control Network for California
Supporting an Accessible Geodetic Control Network for CaliforniaPresented by:The California GIS Council's Geodetic Control Work Group (CGWG)
A Growing Concern for the Geospatial, Land Surveying and Mapping CommunitiesCA GIS Council Geodetic Control Work Group1Presentation TopicsIntroduction of the GCWG.
Importance of a common reference frame.
Why GIS data needs Geodetic Control.
Geodetic control resources in California.
What's Next?
CA GIS Council Geodetic Control Work GroupGeodetic Control Work GroupFormation History and Information The California GIS Council authorized formation of the Geodetic Control Work Group in November 2009.
The work group was assembled in March 2010 & chaired by Marti Ikehara, retired NGS Advisor to California.
A charter and work plan were approved by the CA GIS Council in April, 2011.
Bi-monthly or Monthly teleconferences and meetings.
Outreach subcommittee to give presentations.
The CA GCWG operates independently of other groups.CA GIS Council Geodetic Control Work GroupCA Geodetic Control Work GroupGCWC who are we?Chartered by CA GIS Council in April, 2011
GCWG Sub-committees Strategic Plan SubgroupData Standards SubgroupOutreach / Communication PlanCurrent Chair, Scott Martin CaltransJohn Canas - CSRCLandon Blake ODell Engineering, Inc.Tom Dougherty - S.C.V.W.DJustin Height - Penfield & Smith, ACEC, CARyan Hunsicker Sn.Bdo.Cnty, CLSA Bruce Joffe - GIS ConsultantsRic Moore BPELSGNeil King PhotoScience, Inc. ACEC-CAMark Turner- CaltransMichael McGee - McGee Surveying, CLSAKristin N. Hart - Padre Associates, Inc.Reg Parks - Santa Rosa Junior College, PVTSCA GIS Council Geodetic Control Work GroupGCWG Milestones for SuccessCharter documents (), Strategic Plan, Work Plan (), approved by CA GIS Council.
Outreach Plan to elicit feedback
Geodetic control data sources & standards for metadata.
Recommendations for standards, stewardship, and funding for geodetic theme and infrastructure.
Strategic Plan and Business Plan for adoption by the CGC.
Policy and technical statements for utilization and alignment of the GC theme by other GIS themes.CA GIS Council Geodetic Control Work GroupOverall purpose & goals- well get to some of the details regarding the funding at the end of the presentation- but for now lets focus on just having data line up. Presentation TopicsIntroduction of the GCWG.
Importance of a common reference frame.Why GIS data needs Geodetic Control.
Geodetic control resources in California.
What's Next?
CA GIS Council Geodetic Control Work Group
(Reprioritized to #1 in 2014 FGDC SDI
CA GIS Council Geodetic Control Work GroupCA Spatial Data Infrastructure (SDI) layers closely model the Federal SDI lyers.
7 Federal GIS Framework LayersGovernmental Boundaries
Hydrography
Geodetic Control
Transportation
Cadastral
Elevation
Ortho Imagery
CA GIS Council Geodetic Control Work Group2014 SDI Layer OrderGeodetic control, Orthoimagery, Elevation, Transportation, Hydrography, Governmental units, andCadastral Information
GIS Stacks Map LayersNumerous GIS layers are employed in:
land development construction asset mgmt., land analyses map display etc.
They are updated frequently.
By whom and on what coordinate system?CA GIS Council Geodetic Control Work GroupThe message for this slide is that there are numerous GIS layers employed in land development, asset management, analyses and display. They are frequently updated. By whom and on what coordinate system?
GIS Stacks Map LayersTo accurately position and view features common to different maps or map layers (data sources).
To compare and or analyze the relationships of features on one layer in terms of another layer or layers.CA GIS Council Geodetic Control Work GroupThe message for this slide is that there are numerous GIS layers employed in land development, asset management, analyses and display. They are frequently updated. By whom and on what coordinate system?
Map Layer Alignment How to.Is that1928845.23, 6354191.85?Wheres the pinche control layer?No, wait, thats 1928835.23, 6354192.85CA GIS Council Geodetic Control Work Group
How Do We Align Layers of a Data Sandwich?(or Is Your Control Wimpy?)
CA GIS Council Geodetic Control Work GroupJust specifying a datum (NAD83) and coordinate system in a GIS may not be enough. ESRI now has four realizations.1986 -- NAD831992 -- NAD83(HARN), 2002 -- NAD83(CORS96), 2007 -- NAD83(NSRS2007)w/ the Geospatial Toothpick Equivalent!Geospatial Data Referenced to Geodetic Control
CA GIS Council Geodetic Control Work GroupObjective: Make Everything Line Up
Geodetic Control is (or should be) the foundation for all geospatial productsWithout Geodetic Control as a basemap layer, GIS themes may not ALIGN well
Source: Zurich-American Insurance GroupCA GIS Council Geodetic Control Work Group14All science, industry, and commercial activities that rely on precise positioning require geodetic control. Without a properly georeferenced basemap, the variety of geospatial information that is produced and used may not overlay well.
Note: The photo is a construct and for illustrative purposes ONLY.Uniform Layer Registrationvia a Common, Coordinate-Based Control Network
x1a,y1a,z1ax2a,y2a,z2ax3a,y3a,z3ax1b,y1b,z1bx2b,y2b,z2bx3b,y3b,z3bEvery layer is expressed in the same coordinate system as the CONTROL LAYER.Same Datum & Coordinate SystemCA GIS Council Geodetic Control Work GroupAllows precise alignment of layers through uniform positioning and single reference positional accuracy.15Common Reference FrameImplications are clear(Its about data and data availability)Importance of a common reference frame.Surveys CCS, PRC (Horiz. & Vert.), FEMA & ElevationsCivil EngineeringResidential, Municipal, Statewide Construction,Transportation, Hydrography, HydrologyPublic SafetyFirst responders, Fire and Rescue, Seismic Early WarningGIS Projects -- multiple source layer control Future / Science FACTion / 3D / 4Daerial guidance, vehicle guidance, augmented reality
CA GIS Council Geodetic Control Work GroupPresentation TopicsIntroduction of the GCWG.
Importance of a common reference frame.
Why GIS data needs Geodetic Control.
Geodetic control resources in California.
What's Next?
CA GIS Council Geodetic Control Work GroupGIS Data IntegrationFactious scenarioState mandated County GIS data submission
Parcel Data maintained by County Surveyor
All Counties use the same coordinate systemCA GIS Council Geodetic Control Work GroupGIS Data IntegrationFactious scenario
County ACA GIS Council Geodetic Control Work GroupGIS Data IntegrationFactious scenario
County BCA GIS Council Geodetic Control Work GroupGIS Data IntegrationFactious scenario
County CCA GIS Council Geodetic Control Work Group
GIS Data IntegrationFactious scenarioCounty DCA GIS Council Geodetic Control Work GroupGIS Data IntegrationFactious scenario
County ACA GIS Council Geodetic Control Work GroupGIS Data IntegrationFactious scenario
County ACounty BCA GIS Council Geodetic Control Work GroupGIS Data IntegrationFactious scenario
County ACounty BCounty CCA GIS Council Geodetic Control Work GroupGIS Data IntegrationFactious scenario
County ACounty BCounty CCounty DCA GIS Council Geodetic Control Work Group
GIS Data IntegrationGoogles SolutionCA GIS Council Geodetic Control Work GroupPresentation TopicsIntroduction of the GCWG.
Importance of a common reference frame.
Why GIS data needs Geodetic Control.
Geodetic control resources in California.
What's Next?
CA GIS Council Geodetic Control Work GroupGeodetic ControlCalifornia Spatial Reference Network (CSRN)
Passive Monuments:Monuments set in the ground that require periodic re-observation to determine accurate relative position.Position only valid at the time of survey.
Active Monuments (CGPS)CGPS station collects data 24 hours a day and its relative position is continually monitored.Positions that have become degraded due to earthquakes, subsidence and crustal motion can be updated.
CA GIS Council Geodetic Control Work GroupWe still need the infrastructure29Presentation TopicsIntroduction of the GCWG.
Importance of a common reference frame.
Why GIS data needs Geodetic Control.
Geodetic control resources in California.
What's Next?
CA GIS Council Geodetic Control Work GroupSummary of SituationModern societies need GIS/geospatial data to analyze and manage a wide variety of resources.Geospatial data comes from different sources, but should have one thing in common: the frame of reference.Frame of reference must be defined by an accessible and maintained geodetic control network. Passive networks have limited value: difficult access, expensive to maintain, vulnerable to movement.Active networks (CGPS) are the future, and are the only viable and meaningful basis for geodetic infrastructure in California.Californias active geodetic network is in danger because funding sources are uncertainlack of understanding of importanceno definitively appointed permanent steward (i.e. agency or organization with reliable annual funding)
CA GIS Council Geodetic Control Work GroupRole of GCWGGCWG appointed by California GIS Council to study and advise on geodetic control data standards and infrastructure. Assessment of situation warrants immediate action: outreach and information gathering.We will recommend solutions per our charter...as soon as we figure out what to recommend.Meanwhile, we need your help with ideas and spreading the word.
CA GIS Council Geodetic Control Work GroupIdeas and Possible Solutions Education/InformationPresentations, articles, and lettersEducate surveyors & GISPs on importance of geodetic controlBe visible and accessible at survey/GIS conferences & meetingsTalk and exchange ideas someone may already knowResearch what other states have done dont reinvent wheelLegislationAll official California GIS data to be tied to the geodetic controlCreate new agency? Fund existing agency? AdvocacyForm technical and financial partnerships/consortiums Seek funding sourcesLobbying and promoting
CA GIS Council Geodetic Control Work GroupIf you don't give your feedback, then don't complain about our future recommendations! Supporting an Accessible Geodetic Control Network for CaliforniaPresented by:The California GIS Council's Geodetic Control Work Group (CGWG)Contact:A Growing Concern for the Geospatial, Land Surveying and Mapping CommunitiesThank you for your attention, participation and feedback!Ryan HunsickerScott Martin [email protected]@dot.ca.govCA GIS Council Geodetic Control Work Group1