supporting an accessible geodetic control network for california presented by: the california gis...

Supporting an Accessible Geodetic Control Network for California

Presented by:The California GIS Council's Geodetic Control Work Group

(CGWG)

A Growing Concern for the Geospatial, Land Surveying and Mapping Communities

Presentation Topics

1) Introduction of the GCWG.

2) Importance of a common reference frame.

3) Why GIS data needs Geodetic Control.

4) Geodetic control resources in California.

5) What's Next?

Geodetic 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 Geodetic Control Work Group

GCWC – who are we?Chartered by CA GIS Council in April, 2011

GCWG Sub-committees oStrategic Plan SubgroupoData Standards SubgroupoOutreach / Communication Plan

Current Chair, Scott Martin – Caltrans

John Canas - CSRC Landon Blake – O’Dell Engineering, Inc.

Tom Dougherty - S.C.V.W.D Justin Height - Penfield & Smith, ACEC, CA

Ryan Hunsicker – Sn.Bdo.Cnty, CLSA

Bruce Joffe - GIS Consultants

Ric Moore – BPELSG Neil King – PhotoScience, Inc. ACEC-CA

Mark Turner- Caltrans Michael McGee - McGee Surveying, CLSA

Kristin N. Hart - Padre Associates, Inc.

Reg Parks - Santa Rosa Junior College, PVTS

GCWG Milestones for Success

Charter 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.

Presentation Topics

1) Introduction of the GCWG.

2) Importance of a common reference frame.

3) Why GIS data needs Geodetic Control.

4) Geodetic control resources in California.

5) What's Next?

(Reprioritized to #1 in 2014 FGDC SDI

7 Federal GIS Framework Layers

Governmental Boundaries

Hydrography

Geodetic Control

Transportation

Cadastral

Elevation

Ortho Imagery

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?

Map Layer Alignment – How to….Is that

1928845.23, 6354191.85?

Where’s the pinche control

layer?

No, wait, that’s

1928835.23, 6354192.85

How Do We Align Layers of a Data Sandwich?(or – Is Your Control Wimpy?)

w/ the Geospatial Toothpick Equivalent!Geospatial Data Referenced to Geodetic Control

Objective: Make Everything Line Up

Geodetic Control is (or should be) the foundation for all geospatial products

Without Geodetic Control as a basemap layer, GIS themes may not ALIGN well

Sour

ce: Z

uric

h-A

mer

ican

Ins

uran

ce G

roup

Uniform Layer Registrationvia a Common, Coordinate-Based Control Network

Layer Hydrography

MapUse

Surface water features suchas lakes, ponds, streams, etc.

DataSource

Layer Cadastral

MapUse

Define structure of thesubdivision and ownership ofland

DataSourceLayer Elevation

MapUse

Provides 3rd dimensionalinformation to GIS data

DataSource Layer Ortho Imagery

MapUse

Map Background

DataSource

Layer Governmental Units

MapUse

Governmental Boundaries,zones, districts, etc.

DataSource

Layer Geodetic Control

MapUse

Provides a common referencefor all geospatial data

DataSourceLayer Transportation

MapUse

Model the location,connection, andcharacteristics of roads

DataSource

x1a,y1a,z1a

x2a,y2a,z2a

x3a,y3a,z3a

x1b,y1b,z1b

x2b,y2b,z2b

x3b,y3b,z3b

Every layer is expressed in the same coordinate system as the CONTROL LAYER.

Sam

e D

atu

m &

Co

ord

inat

e S

yste

m

Common Reference FrameImplications are clear

(Its about data and data availability)

Importance of a common reference frame. Surveys – CCS, PRC (Horiz. & Vert.), FEMA &

Elevations Civil Engineering Residential, Municipal, Statewide Construction, Transportation, Hydrography, Hydrology Public Safety First responders, Fire and Rescue, Seismic Early

Warning GIS Projects -- multiple source layer control Future / Science FACTion / 3D / 4D aerial guidance, vehicle guidance, augmented reality

Presentation Topics

1) Introduction of the GCWG.

2) Importance of a common reference frame.

3) Why GIS data needs Geodetic Control.

4) Geodetic control resources in California.

5) What's Next?

GIS Data IntegrationFactious scenario

State mandated County GIS data submission

Parcel Data maintained by County Surveyor

All Counties use the same coordinate system

GIS Data IntegrationFactious scenario

County “A”

GIS Data IntegrationFactious scenario

County “B”

GIS Data IntegrationFactious scenario

County “C”

GIS Data IntegrationFactious scenario

County “D”

GIS Data IntegrationFactious scenario

County “A”

GIS Data IntegrationFactious scenario

County “A”

County “B”

GIS Data IntegrationFactious scenario

County “A”

County “B”

County “C”

GIS Data IntegrationFactious scenario

County “A”

County “B”

County “C”

County “D”

GIS Data IntegrationGoogle’s Solution

Presentation Topics

1) Introduction of the GCWG.

2) Importance of a common reference frame.

3) Why GIS data needs Geodetic Control.

4) Geodetic control resources in California.

5) What's Next?

Geodetic 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.

Presentation Topics

1) Introduction of the GCWG.

2) Importance of a common reference frame.

3) Why GIS data needs Geodetic Control.

4) Geodetic control resources in California.

5) What's Next?

Summary of Situation Modern 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.

California’s active geodetic network is in danger because funding sources are uncertain lack of understanding of importance no definitively appointed permanent steward (i.e.

agency or organization with reliable annual funding)

Role of GCWG GCWG 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.

Ideas and Possible Solutions Education/Information Presentations, articles, and letters Educate surveyors & GISP’s on importance of geodetic control Be visible and accessible at survey/GIS conferences &

meetings Talk and exchange ideas – someone may already know Research what other states have done – don’t reinvent wheelLegislation All official California GIS data to be tied to the geodetic control Create new agency? Fund existing agency? Advocacy Form technical and financial partnerships/consortiums Seek funding sources Lobbying and promoting

Supporting an Accessible Geodetic Control Network for California

Presented by:

The California GIS Council's Geodetic Control Work Group

(CGWG)Contact:

A Growing Concern for the Geospatial, Land Surveying and Mapping Communities

Thank you for your attention,

participation and feedback!

Ryan Hunsicker Scott Martin

rhunsicker@dpw.sbcounty.gov

scott.martin@dot.ca.gov