Details and Metadata

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Methods

The methods followed in the creation of the dataset, including description of field, laboratory and processing steps, and quality control procedures

Current Methods

  • Random plot location
    Started: 2014-07-01

    60 randomly-located 1/20th hectare plots were established within Winooski

  • Setting reference objects
    Started: 2014-07-01

    The plot center is rigorously identified using physical reference objects to allow surveyors to revisit these plots in the future and track changes over time.

  • Identify and measure trees
    Started: 2014-07-01

    Each tree in the plot is identified at least to genus and measured for height, diameter, crown height and width, percents dieback and missing, crown light exposure, and spatial relationship to nearby buildings.

  • Assess land use and ground cover
    Started: 2014-07-01

    Land use proportions and ground cover proportions on the plot are recorded.

  • Process data
    Started: 2014-07-01

    Data are submitted to the US Forest Service i-Tree Eco analysis service to generate city-wide estimates of the composition, condition and ecosystem services of the urban canopy in the city.

Dataset Fields

Detailed documentation of the fields comprising the dataset, including the type of measurement, units where applicable, and any controlled vocabularies or code lists present in the data


Field Name Caption Description Additional Information
LocationNameLocation Name

Name of sample/inventory location (e.g., city name)

Measurement type: Nominal
SeriesProject Series

Description of project

Measurement type: Nominal
i-Tree Series Name
+ show
Appears in data asMeaning of code
1Single Strata
YearYear

Year of data collection

Measurement type: DateTime
Date/Time Format: YYYY
PlotIDPlot ID Number

Plot number

Measurement type: Nominal
SubplotIDSubplot Number

Subplot number

Measurement type: Nominal
DirectiontoObjectDirection to Reference Object

Direction to reference object

Measurement type: Interval
Unit: unavailable
Precision: 1
DistancetoObjectDistance to Reference Object

Distance to reference object

Measurement type: Ratio
Unit: unavailable
Precision: 0.0001
ObjectReference Object Code

Code number of reference object

Measurement type: Nominal
i-Tree Reference Object Definitions
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Appears in data asMeaning of code
1Tree
2Buliding corner
3Building wall
4Building door
5Roof peak
6Light post
7Street sign
8Fence
9Swing set
10Curb
11Driveway edge
12Fire hydrant
13Utility
14Sewer or drain grate
15Other
DbhDiameter of object if tree

Diameter (dbh) of object if a tree

Measurement type: Ratio
Unit: unavailable
Precision: 0.001
NotesNotes

Notes

Measurement type: Nominal
ReferenceObjectTypeReference Object Type

The type or category of reference object

Measurement type: Nominal

Sampling Equipment

Equipment and software used to collect data, including how that equipment was used.

Current Equipment

  • Clinometer
    Started: 2014-07-01

    Suunto clinometer

  • Compass
    Started: 2014-07-01

    Suunto compass

  • Diameter tape
    Started: 2014-07-01

    Forestry Suppliers diameter tape

  • GPS unit
    Started: 2014-07-01

    Garmin Rino 530HCx GPS unit

Site Characteristics

The spatial extent of the dataset site coverage, and descriptions of the spatial extent and context for the data collection

  • Site Description

    60 randomly selected permanent plots throughout Winooski, VT

    Minimum Altitude: 98 feet

    Maximum Altitude: 362 feet