Harbor Seal GIS€¦ · Population Distribution in Southern Massachusetts Nicole Cabana ESRI SERUG...
Transcript of Harbor Seal GIS€¦ · Population Distribution in Southern Massachusetts Nicole Cabana ESRI SERUG...
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Harbor Seal GIS: Harbor Seal GIS: Population Distribution in Southern MassachusettsPopulation Distribution in Southern Massachusetts
Nicole CabanaESRI SERUG
2009
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OutlineOutline
• Background• Aerial Surveys• Objectives• Database• Models• Preliminary Results• Conclusion
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BackgroundBackground
• The Harbor Seal Population in Southern New England is not well understood
• Seals have been protected since the 1970’s by the Marine Mammal Protection Act
• Seal populations are thought to be increasing• Species are not endangered, so receive little
research funding• Aerial surveys have been conducted since 2005• Data has not yet been analyzed
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Aerial SurveysAerial Surveys• NOAA Twin Otter• Monthly: Oct - May• 750’• Canon EOS-1Ds
Mark II 16mp, 300mm• Observer + data
recorder• Low tide• Weather…
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Study AreaStudy Area
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ObjectivesObjectives
• Develop database• Develop models to analyze data
– Extract survey count totals– Depict distribution and changes– Assess environmental variables
• Provide GIS to NOAA scientists with User Manual
• Use information from other harbor seal research
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Alaska Harbor SealsAlaska Harbor Seals
Boveng, P. (2004)
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Alaska Harbor SealsAlaska Harbor Seals• Long term study• Well funded• Variables affect haulout behavior
Boveng, P.
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Environmental VariablesEnvironmental Variables
• Wind speed• Temperature• Low Tide
Other VariablesOther Variables• Time of year• Site-specific weather conditions• Competition with gray seals
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ConstraintsConstraints
• ArcView• Access Personal Geodatabase• Spatial Analyst• Simple data entry and analysis
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DatabaseDatabase
• Access Personal Geodatabase• Very crude initial database• Complete redesign• Data cleaning!• Data entry forms• Data acquisition
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DatabaseDatabase• Tables for aerial survey data:
– Flight Information– Site Specific Information– Seal Counts
• Tables for environmental data:– Tide– Weather
• Tables for relating data:– Haulout, Tide, Weather
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Database: FormsDatabase: Forms
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Database: FormsDatabase: Forms
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Database: FormsDatabase: Forms
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Database: FormsDatabase: Forms
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Database: RelationshipsDatabase: Relationships
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Database: QueriesDatabase: Queries
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Database: Data AcquisitionDatabase: Data Acquisition
• Photo counts• Tide data• Weather data
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Data Acquisition: Tide DataData Acquisition: Tide Data
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Acquisition: Tide DataAcquisition: Tide Data
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Data Acquisition: Weather DataData Acquisition: Weather Data
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Acquisition: Weather DataAcquisition: Weather Data
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Data Acquisition: Seal CountsData Acquisition: Seal Counts
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GIS: ModelsGIS: Models
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Model: Seal Survey Totals BatchModel: Seal Survey Totals Batch
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Batch: Summary StatisticsBatch: Summary Statistics
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Batch: User ParametersBatch: User Parameters
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Batch: Create FC & LayerBatch: Create FC & Layer
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Batch: Iterate FieldBatch: Iterate Field
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Batch: Create Batch: Create FCsFCs & Layers& Layers
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Batch: OutputBatch: Output
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Survey Totals Percent ChangeSurvey Totals Percent Change
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Percent Change: User ParametersPercent Change: User Parameters
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Percent Change: OutputPercent Change: Output
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Survey Low Tide Time DifferenceSurvey Low Tide Time Difference
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Other ModelsOther Models
• Tide Height Averages• Weather Select• Weather Survey Join
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AnalysisAnalysis
• Limited seal count data available• Nantucket Harbor Jetties only complete set
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AnalysisAnalysis
• Expectation 1: More seals haul out ±2 hours of low tide
• Expectation 2: More seals haul out between 1100-1400
• Expectation 3: More seals haul out when winds <35kts
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Expectation 1: TideExpectation 1: Tide
Survey Date Count Time Diff. Hours2/17/2008 229 -0.18333331/19/2008 412 -0.4833333
11/10/2008 2 -0.53333311/19/2007 73 -0.63/29/2007 31 -0.78333334/20/2007 32 -0.833333
11/29/2005 513 -1.11666710/10/2008 8 -1.1666673/12/2008 177 -1.2833332/20/2005 95 -2.466667
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Expectation 2: TimeExpectation 2: TimeDate Count Time
2/20/2005 95 13:2910/10/2005 8 13:4811/19/2007 73 12:05
Date Count Time4/20/2007 32 8:103/12/2008 177 9:08
11/10/2008 2 14:371/19/2008 412 14:372/17/2008 229 14:42
11/29/2005 513 15:053/29/2007 31 15:28
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AnalysisAnalysis
• Result 1:No correlation with survey
• Result 2:Slight(?) correlation with time of day
• Result 3:No surveys were flown with winds >35kts
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Weather AnalysisWeather Analysis
Strong correlation with weather
Date Count Wind Direction Wind Speed Temp Visibility11/29/2005 513 South (140-150) ~15kts 53 8nm mist, clear1/19/2008 412 West (260) ~10kts 36 10nm, clear2/17/2008 229 South (160) ~13kts 38 10nm, clear3/12/2008 177 South (160-190) ~14kts 41 6-9nm light rain mist, ovc 30001/17/2008 0 North (350) ~18-22kts, gusty 20 10nm, clear2/28/2006 0 Northwest (290-350) ~16-22kts, gusty 30 10nm, clear
10/24/2007 0 North (330-350) ~18-20kts, gusty 21 10nm, clear
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Additional Analysis: Seasonal Additional Analysis: Seasonal DistributionDistribution
• Expectation:Highest numbers Dec-Jan-Feb-MarMedium numbers Nov-AprLow numbers Oct-May
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Additional Analysis: Seasonal Additional Analysis: Seasonal DistributionDistribution
Date Count1/19/2008 4122/17/2008 2293/12/2008 177
12/30/2005 1581/27/2006 123
12/21/2007 1223/23/2005 1102/20/2005 1063/27/2006 952/13/2007 923/29/2007 313/4/2005 24
1/17/2007 02/28/2006 0
Date Count11/29/2005 51311/19/2007 734/25/2006 334/20/2007 32
11/10/2008 24/14/2008 0
Date Count10/10/2008 810/24/2007 05/14/2007 0
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Percent Change: Seasonal DistributionPercent Change: Seasonal Distribution
November - December
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Percent Change: Seasonal DistributionPercent Change: Seasonal Distribution
December - January
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Percent Change: Seasonal DistributionPercent Change: Seasonal Distribution
March - April
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Percent Change: Seasonal DistributionPercent Change: Seasonal Distribution
April - May
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Future AnalysisFuture Analysis
• Count data • Distribution model• Share data via Internet
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ConclusionConclusion
• Durable, versatile database and GIS• Manual will allow users with limited
knowledge to effectively use GIS• Powerful models and environmental
assessments will assist in future population modeling
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DataData• Northeast Fisheries Science Center• NOAA: Coastline, Tide data• USGS Bathymetry data• ESRI State Boundary data• NGDC: Weather data • Iterate Value Script: Shitij Mehta• Alaska Harbor Seal Images: Peter Boveng
Thanks to Dr. Gordon Waring and Elizabeth Josephson for use of the seal count data.
Thanks also to AOC.
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Questions?Questions?