Description

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Urban Tree Canopy (UTC) Assessment for Washington, DC. This dataset consists of UTC metrics summarized at the parcel level. The UTC Assessment is a top-down approach to analyzing the urban forest. Its purpose is to integrate high resolution land cover data with other GIS datasets to produce a set of detailed metrics on the urban forest that allow decision makers to know how much tree canopy currently exists (termed Existing UTC) and amount of land where is it biophysically feasible to establish tree canopy on (termed Possible UTC). Existing UTC is determined by extracting all features classified as tree canopy from a high resolution land cover dataset. Possible UTC is determined by identifying land where canopy could possibly exist and includes two subcategories: Possible-impervious and Possible-vegetation. Possible-impervious consists of all impervious land that, through modification, could support tree canopy. Examples of such features are sidewalks, minor driveways (through overhanging coverage), and playgrounds. Possible-vegetation consists of all land that is low-lying vegetation, primarily grass or shrubs, which could conceivably be converted to support tree canopy. Examples of such features include residential lawns and playing fields. Possible-vegetation also includes bare earth where no vegetation or impervious surfaces currently exist. UTC metrics do not serve to address the issues of where it is socially desirable or financially feasible to plant trees. Rather, the UTC metrics serve as the basis for beginning to form answers to these questions. UTC metrics are presented in the attribute table as both absolute area (in square meters) and relative area (percentage of land area) per parcel. For example, an Existing UTC Area (UTC_E_A) value of 13,677 and an Existing UTC Percentage (UTC_E_P) of 21.8 indicate that for the parcel in question the area of Existing UTC is 13,677 (in square meters) and 21.8% of that feature is tree canopy. Key parcel attributes have been maintained to assist in joining this table to the original parcel layer. The land cover dataset used to derive the UTC metrics for this dataset was generated from Quickbird color-infrared imagery acquired on September 7, 2006. Cadastral data (ownership parcels) were current as of January 26, 2009.

Dataset Attributes

  • OBJECTID
    Number
  • SQUAREPLYID
    Number
  • RESERVATIONPLYID
    Number
  • PARCELPLYID
    Number
  • TAXPLYID
    Number
  • RECORDPLYID
    Number
  • ADDRESS_ID
    Number
  • ACCOUNT_ID
    Text
  • RECORDATION_DT
    Date
  • SQUARE
    Text
  • SUFFIX
    Text
  • RES
    Text
  • PAR
    Text
  • LOT
    Text
  • LOT_TYPE
    Number
  • OF_LOT_SEQ
    Number
  • IS_THEORETICAL_LOT
    Number
  • IS_REAR_OF
    Number
  • BOOK_NUM
    Text
  • PAGE_NUM
    Text
  • UNDERLIES_CONDO
    Number
  • CONDO_REGIME_NUM
    Text
  • CONDO_BOOK_NUM
    Text
  • CONDO_PAGE_NUM
    Text
  • RECORD_AREA_SF
    Number
  • COMPUTED_AREA_SF
    Number
  • SURVEYED_AREA_SF
    Number
  • BLDG_NUM
    Number
  • BLDG_NUM_EXT
    Text
  • BLDG_NUM_END_RANGE
    Number
  • BLDG_EXT_END_RANGE
    Text
  • CONV_TOLERANCE_VALUE
    Number
  • CONV_TOLERANCE_RESOLUTION
    Text
  • CONV_TOLERANCE_TYPE
    Number
  • EFFECTIVETAXYEAR
    Date
  • QUADRANT
    Text
  • ZIP5
    Text
  • ZIP4
    Text
  • OP_YN
    Text
  • COL
    Text
  • SSL
    Text
  • ARN
    Text
  • ASRNAME
    Text
  • PROPTYPE
    Text
  • TRIGROUP
    Text
  • USECODE
    Text
  • LANDAREA
    Number
  • PRMSWARD
    Text
  • PREMISEADD
    Text
  • NBHD
    Text
  • NBHDNAME
    Text
  • SUBNBHD
    Text
  • UNITNUMBER
    Text
  • OWNERNAME
    Text
  • CAREOFNAME
    Text
  • ADDRESS1
    Text
  • ADDRESS2
    Text
  • CITYSTZIP
    Text
  • OLDLAND
    Number
  • OLDIMPR
    Number
  • OLDTOTAL
    Number
  • NEWLAND
    Number
  • NEWIMPR
    Number
  • NEWTOTAL
    Number
  • PHASELAND
    Number
  • PHASEBUILD
    Number
  • PARTPART
    Text
  • VACLNDUSE
    Text
  • LOWNUMBER
    Text
  • HIGHNUMBER
    Text
  • STREETNAME
    Text
  • STREETCODE
    Text
  • QDRNTNAME
    Text
  • DELCODE
    Text
  • HSTDCODE
    Text
  • CLASSTYPE
    Text
  • TAXRATE
    Number
  • MIXEDUSE
    Text
  • MIX1TXTYPE
    Text
  • MIX1CLASS
    Text
  • MIX1RATE
    Number
  • MIX1LNDPCT
    Number
  • MIX1LNDVAL
    Number
  • MIX1BLDPCT
    Number
  • MIX1BLDVAL
    Number
  • MIX2TXTYPE
    Text
  • MIX2CLASS
    Text
  • MIX2RATE
    Number
  • MIX2LNDPCT
    Number
  • MIX2LNDVAL
    Number
  • MIX2BLDPCT
    Number
  • MIX2BLDVAL
    Number
  • OWNOCCT
    Number
  • COOPUNITS
    Number
  • PCHILDCODE
    Text
  • ABTLOTCODE
    Text
  • SALEPRICE
    Number
  • SALEDATE
    Date
  • INSTNO
    Text
  • ACCEPTCODE
    Text
  • SALETYPE
    Text
  • MORTGAGECO
    Text
  • ASSESSMENT
    Number
  • ANNUALTAX
    Number
  • EXTRACTDAT
    Date
  • DEEDSTATUS
    Text
  • CAPCURR
    Number
  • CAPPROP
    Number
  • TXSALEDESC
    Text
  • CLASS3
    Text
  • CLASS3EX
    Number
  • CY1YEAR
    Text
  • CY1TXSALE
    Text
  • CY1TAX
    Number
  • CY1PEN
    Number
  • CY1INT
    Number
  • CY1FEE
    Number
  • CY1TOTDUE
    Number
  • CY1COLL
    Number
  • CY1BAL
    Number
  • CY1CR
    Number
  • CY2YEAR
    Text
  • CY2TXSALE
    Text
  • CY2TAX
    Number
  • CY2PEN
    Number
  • CY2INT
    Number
  • CY2FEE
    Number
  • CY2TOTDUE
    Number
  • CY2COLL
    Number
  • CY2BAL
    Number
  • CY2CR
    Number
  • PY1YEAR
    Text
  • PY1TXSALE
    Text
  • PY1TAX
    Number
  • PY1PEN
    Number
  • PY1INT
    Number
  • PY1FEE
    Number
  • PY1TOTDUE
    Number
  • PY1COLL
    Number
  • PY1BAL
    Number
  • PY1CR
    Number
  • PY2YEAR
    Text
  • PY2TXSALE
    Text
  • PY2TAX
    Number
  • PY2PEN
    Number
  • PY2INT
    Number
  • PY2FEE
    Number
  • PY2TOTDUE
    Number
  • PY2COLL
    Number
  • PY2BAL
    Number
  • PY2CR
    Number
  • PY3YEAR
    Text
  • PY3TXSALE
    Text
  • PY3TAX
    Number
  • PY3PEN
    Number
  • PY3INT
    Number
  • PY3FEE
    Number
  • PY3TOTDUE
    Number
  • PY3COLL
    Number
  • PY3BAL
    Number
  • PY3CR
    Number
  • PY4YEAR
    Text
  • PY4TXSALE
    Text
  • PY4TAX
    Number
  • PY4PEN
    Number
  • PY4INT
    Number
  • PY4FEE
    Number
  • PY4TOTDUE
    Number
  • PY4COLL
    Number
  • PY4BAL
    Number
  • PY4CR
    Number
  • PY5YEAR
    Text
  • PY5TXSALE
    Text
  • PY5TAX
    Number
  • PY5PEN
    Number
  • PY5INT
    Number
  • PY5FEE
    Number
  • PY5TOTDUE
    Number
  • PY5COLL
    Number
  • PY5BAL
    Number
  • PY5CR
    Number
  • PY6YEAR
    Text
  • PY6TXSALE
    Text
  • PY6TAX
    Number
  • PY6PEN
    Number
  • PY6INT
    Number
  • PY6FEE
    Number
  • PY6TOTDUE
    Number
  • PY6COLL
    Number
  • PY6BAL
    Number
  • PY6CR
    Number
  • PY7YEAR
    Text
  • PY7TXSALE
    Text
  • PY7TAX
    Number
  • PY7PEN
    Number
  • PY7INT
    Number
  • PY7FEE
    Number
  • PY7TOTDUE
    Number
  • PY7COLL
    Number
  • PY7BAL
    Number
  • PY7CR
    Number
  • PY8YEAR
    Text
  • PY8TXSALE
    Text
  • PY8TAX
    Number
  • PY8PEN
    Number
  • PY8INT
    Number
  • PY8FEE
    Number
  • PY8TOTDUE
    Number
  • PY8COLL
    Number
  • PY8BAL
    Number
  • PY8CR
    Number
  • PY9YEAR
    Text
  • PY9TXSALE
    Text
  • PY9TAX
    Number
  • PY9PEN
    Number
  • PY9INT
    Number
  • PY9FEE
    Number
  • PY9TOTDUE
    Number
  • PY9COLL
    Number
  • PY9BAL
    Number
  • PY9CR
    Number
  • PY10YEAR
    Text
  • PY10TXSALE
    Text
  • PY10TAX
    Number
  • PY10PEN
    Number
  • PY10INT
    Number
  • PY10FEE
    Number
  • PY10TOTDUE
    Number
  • PY10COLL
    Number
  • PY10BAL
    Number
  • PY10CR
    Number
  • OWNNAME2
    Text
  • DEEDS
    Number
  • GIS_ID
    Number
  • Shape
    Number
  • CONDOLOT
    Text
  • AREA
    Number
  • LEN
    Number
  • OBJECTID
    Number
  • UTC_ID
    Number
  • UTC Land Area
    Number
  • UTC Existing Area
    Number
  • UTC Possible-Vegetation Area
    Number
  • UTC Possible-Impervious Area
    Number
  • UTC Possible Area
    Number
  • UTC Existing Percent
    Number
  • UTC Possibe-Vegetation Percent
    Number
  • UTC Possibe-Impervious Percent
    Number
  • UTC Possibe Percent
    Number
  • GIS_ID
    Text
  • SSL
    Text

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