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

  • Canopy photography
    Started: 1991-06-26

    A canopy photography technique for monitoring stand condition was developed to allow comparisons with forest health survey plots.

  • Photo points
    Started: 1993-07-01

    24-25 permanent photo points per forest health plot (North American Maple Project plot and 2 Forest Health Monitoring plots at 1400 and 2200 ft).

  • Camera set up
    Started: 1991-06-26

    True color slides using wide angle lens on 35mm camera mounted vertically from a tripod at a height of 1 m from the ground.

  • Time frame
    Started: 1993-07-01

    Slides are taken in late July to early August.

  • Image analysis
    Started: 1991-06-26

    Image analysis is done with either a computerized image analysis (Swath Kit) or through manual projections.

  • Percent canopy
    Started: 1991-06-26

    Percent canopy cover is measured.

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
Can_CoverCanopy Cover

Canopy cover (percent of sky not obscured by vegetation) measured from hemispherical fixed plot image

Measurement type: Ratio
Units:
Precision: 0.00001
DateDate

Date

Measurement type: DateTime
Date/Time Format: DD/MM/YYYY
PlotPlot

Plot

Measurement type: Nominal
Plot_meanPlot mean

Mean of canopy cover for each plot

Measurement type: Ratio
Units:
Precision: 0.00001
SiteSite

Location of photo plot

Measurement type: Nominal
Swath_kitSwath kit

Computer generated canopy measurement

Measurement type: Ratio
Units:
Precision: 0.01

Sampling Equipment

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

Current Equipment

  • Camera,

    35 mm camera with a 17 mm wide angle lens; Ektachrome slides (ISO200); tripod. plumb bob; bubble level

Site Characteristics

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

  • Site Description

    Browns River drainage at 1400 and 2200 feet.

  • Site Description

    Northern hardwood forests.