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Inter-Agency Datum Establishment and Conversion Collaboration in Missouri. 2013 National Height Modernization Partner Meeting Western States Regional Webinar. Paul H. Rydlund Jr. PLS U.S. Geological Survey Missouri Water Science Center. What’s the problem?. - PowerPoint PPT Presentation
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U.S. Department of the InteriorU.S. Geological Survey
Inter-Agency Datum Establishment and Inter-Agency Datum Establishment and Conversion Collaboration in Missouri.Conversion Collaboration in Missouri.
Paul H. Rydlund Jr. PLSPaul H. Rydlund Jr. PLSU.S. Geological SurveyU.S. Geological SurveyMissouri Water Science CenterMissouri Water Science Center
2013 National Height Modernization Partner Meeting2013 National Height Modernization Partner MeetingWestern States Regional WebinarWestern States Regional Webinar
What’s the problem?What’s the problem?
• Reporting vertical datum differences generates Reporting vertical datum differences generates confusion and depreciates public confidence.confusion and depreciates public confidence.
What’s the problem?What’s the problem?
• Reporting vertical datum differences generates Reporting vertical datum differences generates confusion and depreciates public confidence.confusion and depreciates public confidence.
River ForecastingRiver Forecasting
For example….For example….
What’s the problem?What’s the problem?
• Public welfare regarding impactsPublic welfare regarding impacts
What’s the problem?What’s the problem?
• Cooperative agencies all disseminate vertical datum for Cooperative agencies all disseminate vertical datum for reference of hydrologic products. Consistency reference of hydrologic products. Consistency ((and and accuracyaccuracy)) is needed. is needed.
What’s the problem?What’s the problem?
• Levee overtopping concerns exist where USGS Levee overtopping concerns exist where USGS streamgage datum and datum for levee surveys differ.streamgage datum and datum for levee surveys differ.
For example….For example….
Public Protection LevelPublic Protection Level
What’s the problem?What’s the problem?
• Inundation mapping, whether agency function or private Inundation mapping, whether agency function or private sector, is dependent upon datum representing sector, is dependent upon datum representing consistency and quality.consistency and quality.
USGS Policy GuidanceUSGS Policy Guidance
NAVD88 is the recommended datum established NAVD88 is the recommended datum established in the Federal Geographic Data framework in the Federal Geographic Data framework
(USGS - Office of Water Information Technical (USGS - Office of Water Information Technical memorandum 2002.01). memorandum 2002.01).
USGS Database StatisticsUSGS Database Statistics
1.1. 84,944 Surface-Water sites84,944 Surface-Water sites
62,032 determined elevation from maps62,032 determined elevation from maps 7,737 from levels7,737 from levels 8,023 unknown source 8,023 unknown source 1,269 from a GPS1,269 from a GPS
2.2. 4,771 already reported to NAVD884,771 already reported to NAVD88
NGS-USGS-NWS-USACE NGS-USGS-NWS-USACE Streamgage Datum WorkgroupStreamgage Datum Workgroup
• Workgroup interaction and support for datum conversion of Workgroup interaction and support for datum conversion of USGS streamgages to NAVD 88USGS streamgages to NAVD 88• Driven by “unfunded mandate” to update gage datumsDriven by “unfunded mandate” to update gage datums• Pilot states of Missouri, North Carolina, and MichiganPilot states of Missouri, North Carolina, and Michigan
• GoalsGoals• Establish decision model:Establish decision model:
• How to prioritize gages to update?How to prioritize gages to update?• How to determine accuracy needed?How to determine accuracy needed?• What method to measure/compute/derived updated What method to measure/compute/derived updated
heightheight• Create guidelines that other regions/districts can useCreate guidelines that other regions/districts can use
NGS-USGS-NWS-USACE NGS-USGS-NWS-USACE Streamgage Datum WorkgroupStreamgage Datum Workgroup
• Site Priority – driven by need and resourcesSite Priority – driven by need and resources• Cooperative Interest – needed by multiple agenciesCooperative Interest – needed by multiple agencies• Location, e.g. high population areas subject to floodingLocation, e.g. high population areas subject to flooding• Accuracy Requirement – dictate method for conversionAccuracy Requirement – dictate method for conversion
• Method for conversion – driven by accuracy requirements and Method for conversion – driven by accuracy requirements and resourcesresources• Rename datumRename datum• Simplistic Height Conversion Tool: VERTCON, CORPSCONSimplistic Height Conversion Tool: VERTCON, CORPSCON• GNSS SurveyGNSS Survey• LevelingLeveling
• RoadblocksRoadblocks• Lack of resources regarding personnel, expertise, and fundingLack of resources regarding personnel, expertise, and funding
NAVD 88 Datum Conversion : Simple Height NAVD 88 Datum Conversion : Simple Height Conversion or Survey – “The USGS Missouri Model”Conversion or Survey – “The USGS Missouri Model”
Cooperative Interest
Cooperative Interest
Gage locationhydraulics or channel instability
1. Evaluation of 1. Evaluation of Source DatumSource Datum
2. Cooperative 2. Cooperative InterestInterest
3. Hydraulics 3. Hydraulics and Stabilityand Stability
4. Accuracy assured4. Accuracy assured with USACE ‘CEPD’with USACE ‘CEPD’ and NWS modeling and NWS modeling interestsinterests
Source Datum genesis and condition
Accuracy
NWKNWK
SWLSWL
MVLMVL
MVSMVS
MVMMVM
USACEUSACE
MODOTMODOT
MDNRMDNR
Inter-Agency Collaboration in MissouriInter-Agency Collaboration in Missouri
Missouri River Missouri River Datum DiscrepancyDatum DiscrepancyExampleExample
Inter-Agency Collaboration in MissouriInter-Agency Collaboration in Missouri
Continuing Inter-Agency Collaboration in Continuing Inter-Agency Collaboration in Missouri – FY 13Missouri – FY 13
USACE – SWLUSACE – SWLUSGS - MOWSCUSGS - MOWSCUSGS - ARWSCUSGS - ARWSC
Continuing Inter-Agency Collaboration in Continuing Inter-Agency Collaboration in Missouri – FY 13Missouri – FY 13
Inter-Agency Collaboration in Missouri – FY 14Inter-Agency Collaboration in Missouri – FY 14
Datum Surveys – Moving ForwardDatum Surveys – Moving Forward
USGS and USACE duplicative surveys at important gaging locations Main stem Missouri and Mississippi River gages Water resource operation project gages Limited duplication at tributary gages
USGS / USACE surveys Sharing of metadata and results Overcome cost prohibitive gaging locations Augmenting staff for local/regional GNSS campaigns
USGS Gaging Installation Installation of an observable benchmark
Dissemination ofNGVD 29 andNAVD 88 datum
Dissemination ofNGVD 29 andNAVD 88 datum
Inter-Agency Collaboration
Inter-Agency Collaboration
Datum Surveys – Assistance and CollaborationDatum Surveys – Assistance and Collaboration
http://www.ngs.noaa.gov/ADVISORS/AdvisorsIndex.shtmlhttp://www.ngs.noaa.gov/ADVISORS/AdvisorsIndex.shtml
Inter-Agency Collaboration
[email protected]@usace.army.milDatum Surveys – Assistance and CollaborationDatum Surveys – Assistance and Collaboration
Benefits of Inter-Agency Collaboration
Enhance ResourcesEnhance Resources
Reduce ExpenseReduce Expense
Quality AssuranceQuality Assurance
Agency ConsensusAgency Consensus Public ApprovalPublic Approval
USGS Resources – Questions?
http://water.usgs.gov/usgs/osw/gps/
USGS Global Positioning System Web CommitteeUSGS Global Positioning System Web Committee