using geomatics in urban forestry geomatics in urban forestry •using geographic data helps us...
TRANSCRIPT
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Using Geomaticsin Urban Forestry
By Kieran Hunt
PAUL COWIE AND ASSOCIATESc o n s u l t i n g a r b o r i s t s / u r b a n f o r e s t e r s
All maps in this presentation were created by Kieran Hunt of Paul Cowie and Associates, Inc. Reuse, distribution, or copying of any parts of this presentation are prohibited without express permission from Kieran Hunt.
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Kieran Hunt
• B.S. in Ecology, Evolution, and Natural Resource Management from Rutgers University, New Jersey• Certificate in Environmental Geomatics
• Urban Ecology and Geomatics• Paul Cowie and Associates, Inc.
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Using Geomaticsin Urban Forestry
• Using geographic data helps us manage urban forests effectively.
• Uses vector and raster data
• Involves learning map making.
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Using Geomaticsin Urban Forestry
• Urban forestry: managing urban trees on a forest level.• Large amounts of data / many trees.
• Easy to overwhelm clients… or ourselves.
• Geomatics enhances management, communication, and ability to meet goals.
• The future of urban forestry!
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What is Geomatics?
• Geomatics: the field of using, managing, and distributing geographically referenced (georeferenced) and associated information.
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Isn’t that “GIS”?
• Geographic Information System (GIS): any system for the management/distribution of georeferenced and associated information.
• Examples of Geographic Information Systems:• A hard copy spreadsheet of street trees and addresses.
• A computer system containing satellite imagery of the entire world.
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Geomatics Vs. GIS
• A GIS is a system for managing a specific set ofgeographically relevant data (for a specific project, location, field of study, etc.).
• Geomatics is the field of utilizing geographically relevant information, and includes the management of geographic information systems.
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Types of Georeferenced Data
• Discrete features have defined locations on the ground, often represented by points or shapes: • Trees
• Roads
• Buildings
• Planting sites
• Property lines
• Continuous data are contained in a grid of numeric values:• Satellite imagery
• Aerial photography
• Elevation data
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Types of Geographic Data:Vector Data
• Discrete features.
• Represented by:• Points
• Lines
• Polygons
• Can have infinite attribute information
• Feature: a tree.
• Attributes: species, tag number, health, required maintenance work, planting site type, etc.
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Vector DataBranch Brook Park, Newark, New Jersey, USA
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Vector DataBranch Brook Park, Newark, New Jersey, USA
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Vector DataBranch Brook Park, Newark, New Jersey, USA
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Vector DataBranch Brook Park, Newark, New Jersey, USA
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Vector DataBranch Brook Park, Newark, New Jersey, USA
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Vector DataBranch Brook Park, Newark, New Jersey, USA
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Vector DataBranch Brook Park, Newark, New Jersey, USA
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Vector DataAttribute Table
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Types of Geographic Data:Raster Data
• Raster data (continuous data):• Images
• Elevation
• Slope
• Anything which can be described with a numeric value
• Arranged in a grid (pixels)
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Types of Geographic Data:Raster Data
• Examples:• Color satellite imagery
• Percent live vegetation
• Can be used to perform math:• Change in tree canopy cover (old canopy – new canopy)
• More advanced algorithms
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Raster Data: Aerial ImageryNewark, New Jersey, USA
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Raster Data: Vegetation IndexNewark, New Jersey, USA
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Raster Grid Zoomed InNewark, New Jersey, USA
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Uses for Vector Datain Urban Forestry
• Points data• Trees
• Vacant planting sites
• Lines data• Utilities
• Roads
• Planting Strips
• Polygons data• Structures / Context
• Blocks of forest
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Uses for Vector Datain Urban Forestry
• Sifting through the noise:• Showing 5,000 trees is impressive, not very informative.
• Attributes give data meaning!
• Symbolize by color, heatmap, shape, size, etc.• Make maps that are intuitive and user-friendly.
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Displaying Vector Data
• KNOW YOUR QUESTION• Your map will not have purpose if you don’t.
• Sift through the noise:• Often more useful to remove information.
• Show only what’s needed to answer a question.
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Displaying Vector Data
• Making data useful:• Mapmaking combines technical knowledge with
aesthetic communication.
• Maps must be readable and intuitive.
• Gathering information often easier than conveying it.
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Displaying Vector Data
• Technically sound maps that are not aesthetically pleasing will seem less trustworthy to your client.
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Displaying Vector Data
• This slide has a lot of loud text on it.• I’ll bet your first reaction when you saw the slide was not
excitement about reading all the text on it.
• There’s really too much going on on this slide:• If there were fewer things, and their styles matched, the
slide would feel more approachable. • Maps shouldn’t be this busy either.• Slides and maps must be readable and intuitive.• Cramming too much information makes them
unapproachable and busy.
• Don’t make maps like this slide:• It’s better to remove unnecessary information, displaying
only enough to answer our question.
• Too much information makes for busy maps.• (And busy slides.)
• Do you trust me?
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Displaying Vector Data
• Sifting through the noise:• Often better to remove information, displaying only
what we need.
• Too much information makes for busy maps.
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Too Much Data!Branch Brook Park, Newark, New Jersey, USA
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Tree Condition DataBranch Brook Park, Newark, New Jersey, USA
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Borers DataBranch Brook Park, Newark, New Jersey, USA
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Borers PointsBranch Brook Park, Newark, New Jersey, USA
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Borers HeatmapBranch Brook Park, Newark, New Jersey, USA
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Condition HeatmapBranch Brook Park, Newark, New Jersey, USA
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Displaying Raster Data
• Sifting through the noise:• Again, often better to only show what we need to see
to answer a question.
• Aesthetic communication:• Raster data consists purely of numerical values.
• How do we display that in a meaningful and aesthetically pleasing way?
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Aerial ImageryNewark, New Jersey, USA
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Vegetation IndexNewark, New Jersey, USA
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Vegetation Index, ResymbolizedNewark, New Jersey, USA
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Advanced Raster Data Processes
• Raster data can be processed to show specific information.
• Normalized Difference Vegetation Index (NDVI) 1: • Calculated from red (R) and near infrared (NIR) bands of
light.
• NDVI = (NIR-R)/(NIR+R)
• Useful for showing areas in need of tree canopy; helps manage equity in an urban forest.
1. Kriegler, F.J., Malila, W.A., Nalepka, R.F., and Richardson, W. (1969) 'Preprocessing transformations and their effects on multispectral recognition.' Proceedings of the Sixth International Symposium on Remote Sensing of Environment, p. 97-131.
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Aerial ImageryNewark, New Jersey, USA
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NDVI (Gray to Green)Newark, New Jersey, USA
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Combining Vector & Raster Data: A Case Study in Paramus, NJ
• Vector Data:• Roads
• Used to approximate public right-of-way
• Raster Data:• Aerial Imagery
• Processed to Vegetation Index
• Further Processed to Vacant Lawns
• Used to generate possible planting sites
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Aerial ImageryParamus, New Jersey, USA
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RoadsParamus, New Jersey, USA
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Buffered RoadsParamus, New Jersey, USA
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Buffered Roads with NDVIParamus, New Jersey, USA
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NDVI Clipped to RoadsParamus, New Jersey, USA
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NDVI Mid-FifthParamus, New Jersey, USA
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NDVI Mid-Fifth Over NIRParamus, New Jersey, USA
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SievedParamus, New Jersey, USA
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Original ImageryParamus, New Jersey, USA
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Calculated LawnsParamus, New Jersey, USA
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Auto-Generated Vacant SitesParamus, New Jersey, USA
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Auto-Generated Vacant SitesParamus, New Jersey, USA
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It’s Not Perfect!Paramus, New Jersey, USA
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Vacant Sites, UncorrectedParamus, New Jersey, USA
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Vacant Sites, CorrectedParamus, New Jersey, USA
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Broad-Scale ManagementParamus, New Jersey, USA
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Combining Vector & Raster Data: A Case Study in Paramus, NJ
• Vector Data:• Roads
• Used to approximate public right-of-way
• Raster Data:• Aerial Imagery
• Processed to Vegetation Index
• Further Processed to Vacant Lawns
• Used to generate possible planting sites
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Using Geomaticsin Urban Forestry
• Using both vector and raster data to answer questions.
• Know your question before you start!• Needed to collect appropriate data.
• Maps will not have purpose if no goal in mind.
• Sift through the noise:• Often better to remove information.
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Using Geomaticsin Urban Forestry
• Making data useful:• Mapmaking combines technical knowledge with
aesthetic communication.
• Maps must be readable and intuitive.
• Gathering technical information often easier than conveying to the layperson.
• Maps that are not aesthetically pleasing will seem less trustworthy to your client.
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The Data is Out There
• NAIP Imagery• https://www.fsa.usda.gov/programs-and-services/aerial-
photography/imagery-programs/naip-imagery/
• Land Cover Raster Data:• http://www.mrlc.gov/
• US Census Bureau Roads Data:• https://www.census.gov/geo/maps-data/data/tiger-line.html
• Most states have a dedicated GIS website• Land Use / Land Cover Imagery
• Roads
• Watersheds
• Much more
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The Tools are Out There
• GIS Software:• ESRI ArcGIS (costly, but arguably the best)
• Quantum GIS (QGIS) (open-source, less user-friendly)
• Useful Reading:• “GIS Fundamentals” by Paul Bolstad
• “Remote Sensing of the Environment: An Earth Resource Perspective” by John R. Jensen
• “Designing Better Maps: A Guide for GIS Users” by Cynthia A. Brewer
• Classes / certificates at local colleges.
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The Broader Picture
• Geomatics and GIS are revolutionizing our industry.
• Technology can improve our management.
• Some questions cannot be answered effectively without geographic information.
• This is the future of our field – this is just the beginning!
• If you don’t do it, someone else will!
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Questions?