DATABASE NAME

     AIRPORT/RUNWAY: Runways for Landing facilities in the United
     States  (version 2.0)

DATABASE DESCRIPTION

     A comprehensive geographic database of runways in the United
     States containing information on the physical
     characteristics of the runways. The database includes
     runways in all 50 states as well as US territories.

ORIGINATING AGENCY

     Volpe National Transportation Systems Center

AGENCY RESPONSIBLE FOR MAINTAINING DATA

     Volpe National Transportation Systems Center

CONTACT

     National Transportation Atlas Databases
     Bureau of Transportation Statistics
     U.S. Department of Transportation
     Washington, DC  20590
     (202) 366-DATA
     Internet:  info@bts.gov

SOURCE

     Data were obtained from the Federal Aviation
     Administration's (FAA) National Flight Data Center (NFDC)
     landing facilities database for February 1994. 

ACCURACY

     50 m (165 ft) root-mean square positional accuracy

TYPE OF GIS DATABASE

     Line database with nodes and links

FILES/SIZE/NUMBER OF RECORDS

     Two ASCII files

     1)   runway.pnt     node file contains point locations
     2)   runway.lin     link file contains link attributes

     Approximate size of file:     2,542,000 bytes
     Approximate number of nodes:  
     Approximate number of links:

FILE STRUCTURE

     The files are ASCII-comma delimited.  Character fields are
     contained in quotation marks.

     The Node File

     FIELD 1:
          Name:     Node Number
          Type:     Long Integer
          Wdth:     10 characters
          Desc:     Unique record identifier for node
          Orig:     Generated by TRANSCAD

     FIELD 2:
          Name:     Longitude
          Type:     Floating Point
          Wdth:     13
          Desc:     The longitude of the node in decimal degrees.
          Orig:     NFDC

     FIELD 3:
          Name:     Latitude
          Type:     Floating Point
          Wdth:     12
          Desc:     The latitude of the node in decimal degrees.
          Orig:     NFDC

The Link File

     FIELD 0a:      
          Name:     From Node
          Type:     Long integer
          Wdth:     10
          Desc:     "From" node number in node file
          Orig:     Generated by TRANSCAD

     FIELD 0b: 
          Name:     To Node
          Type:     Long integer
          Wdth:     10
          Desc:     "To" node number in node file
          Orig:     Generated by TRANSCAD

     FIELD 0c:
          Name:     ID
          Type:     Long integer
          Wdth:     10
          Desc:     Unique record identifier
          Orig:     Generated by TRANSCAD

     FIELD 0d:
          Name:     Distance
          Type:     Floating Point
          Wdth:     8
          Desc:     Distance between From and To nodes
          Orig:     Generated by TRANSCAD

     FIELD 0e:
          Name:     Direction
          Type:     Long integer
          Wdth:     10
          Desc:     Always 0
          Orig:     Generated by TRANSCAD

     FIELD 1:
          Name:     LOCID
          Type:     Character
          Width:    4
          Desc:     Unique 3-4 character identifier assigned to
                    the runway's landing facility. 
          Orig:     NFDC

     FIELD 2:
          Name:     Site Number
          Type:     Character
          Width:    10 characters
          Desc:     A unique identifying number for the runway's
                    landing facility, which, together with the
                    'landing facility type' code (Field 4), forms
                    the key to the airport records in the NFDC
                    database. Example: 04508.*A.  Note that only
                    the number portion appears in this field.
          Orig:     NFDC

     FIELD 3:
          Name:     Facility Name
          Type:     Character
          Wdth:     43
          Desc:     Name of the runway's landing facility.
          Orig:     NFDC

     FIELD 4:
          Name:     Facility Type
          Type:     Character
          Wdth:     1
          Desc:     A    Airport
                    H    Heliport
                    S    Seaplane Base
                    T    Stolport
          Orig:     NFDC

     FIELD 5:
          Name:     Runway ID
          Type:     Character
          Wdth:     7
          Desc:     Runway identification, e.g., 01/19; 18L/36R
                    (parallel runways); H1 (helipad); N/S
                    (north/south); ALL/WAY (seaplane).
          Orig:     NFDC

     FIELD 6:
          Name:     Runway Length
          Type:     Floating Point
          Wdth:     8
          Desc:     The physical runway length, to the nearest
                    foot. 
          Orig:     NFDC

     FIELD 7:
          Name:     Runway Width
          Type:     Floating Point
          Wdth:     9
          Desc:     The physical runway width, to the nearest
                    foot.
          Orig:     NFDC

     FIELD 8:
          Name:     Runway Sur Type/Con
          Type:     Character
          Wdth:     11
          Desc:     Runway surface type and condition.
                    CONC      Portland cement concrete
                    ASHP      Asphalt or bituminous concrete
                    SNOW      Snow
                    ICE       Ice
                    MATS      Pierced steel planking; landing
                              mats; membranes
                    TREATED   Oiled; soil cement or lime
                              stabilized
                    GRAVEL    Gravel; cinders; crushed rock;
                              coral or shells; slag
                    TURF      Grass; sod
                    DIRT      Natural soil
                    WATER     Water
                    G         Good Condition
                    F         Fair Condition
                    P         Poor Condition

                    Surface type can have one entry or a
                    combination of two entries when the runway is
                    composed of distinct sections.

                    The surface type is optionally followed by a
                    condition indicator (e.g., ASPH-CONC,  ASPH-
                    F,  ASPH-CONC-G).

          Orig:     NFDC

     FIELD 9:
          Name:     Runway Sur Treatment
          Type:     Character
          Wdth:     5
          Desc:     Runway surface treatment. 
                    GRVD      Saw-cut or plastic grooved
                    PFC       Porous friction course
                    AFSC      Aggregate friction seal coat
                    RFSC      Rubberized friction seal coat
                    WC        Wire comb or wire tine
                    NONE      No special surface treatment
          Orig:     NFDC

     FIELD 10:
          Name:     Runway PCN 
          Type:     Character
          Wdth:     11
          Desc:     Runway Pavement Classification Number (PCN). 

                    PCN is a rating system that expresses the
                    relative load carrying capacity of a pavement
                    in terms of a standard single wheel load. 
                    The rating is structured so that a pavement
                    with a particular PCN value can support,
                    without weight restrictions, an aircraft
                    which has an aircraft classification number
                    (ACN) equal to or less than the pavement's
                    PCN value.

                    The data format is PCN / pavement_type /
                    subgrade_strength / tire pressure /
                    determination_method, where:

                    PCN: a numerical value
                    Pavement type:  R-Rigid  F-Flexible
                    Subgrade strength: Letters A-F
                    Tire pressure code: Letters W-Z
                    Determination method: T-Technical U-Using
                    aircraft

                    (ex. 61/F/B/X/T)

                    See FAA Advisory Circular 150/5335-5 for code
                    definitions and PCN determination formula.

          Orig:     NFDC

     FIELD 11:
          Name:     Rwy Lgts Edge Inten
          Type:     Character
          Wdth:     4
          Desc:     Runway lights edge intensity.
                         HIGH      High
                         MED       Medium
                         LOW       Low
                         NSTD      Non-standard lighting system
                         NONE      No edge lighting system
          Orig:     NFDC

     FIELD 12:
          Name:     Base End ID
          Type:     Character
          Wdth:     3
          Desc:     Base end indentifier.  The runway end that
                    relates to the first part of the runway
                    identification (e.g., for runway 18/36 the
                    base end is 18).  The runway identification
                    is in Field 5. 
          Orig:     NFDC

     FIELD 13:
          Name:     BE True Alignment
          Type:     Character
          Wdth:     3
          Desc:     The true magnetic heading of the base end of
                    the runway, to the nearest degree  (e.g., for
                    runway base end 18, could be 184).
          Orig:     NFDC

     FIELD 14:
          Name:     BE ILS Type
          Type:     Character
          Wdth:     9
          Desc:     The type of Instrument Landing System (ILS)
                    for the base end of the runway.  
                         ILS       instrument landing system
                         MLS       microwave landing system
                         SDF       simplified directional
                                   facility
                         LOCALIZER  localizer
                         LDA       localizer-type directional aid
                         ISMLS     interim standard microwave
                                   landing system
                         ILS/DME   instrument landing system /
                                   distance measuring equipment
                         SDF/DME   simplified directional
                                   facility / distance measuring
                                   equipment
                         LOC/DME   localizer / distance measuring
                                   equipment
                         LOC/GS    localizer / glide slope
                         LDA/DME   localizer-type directional aid
                                   / distance measuring equipment
          Orig:     NFDC

     FIELD 15:
          Name:     BE AC Arresting Device
          Type:     Character
          Wdth:     6
          Desc:     Type of aircraft arresting device.  Indicates
                    the type of jet arresting barrier  installed
                    at the far end of the base end of the runway
                    (e.g., MA1, MA1A, BAK9, BAK6, E14, E15, E5,
                    etc.)     

                    See DOD Flight Information Publication
                    (Enroute): IFR - Supplement United States,
                    published by the Defense Mapping Agency
                    Aerospace Center, St. Louis, MO, for code
                    definitions.
          Orig:     NFDC

     FIELD 16:
          Name:     BE Vis Glide Slp Ind
          Type:     Character
          Wdth:     4
          Desc:     Visual glide slope indicators at the base end
                    of the runway.
                    S2L       2-Box SAVASI on left side of runway
                    S2R       2-Box SAVASI on right side of
                              runway
                    V2L       2-Box VASI on left side of runway
                    V2R       2-Box VASI on right side of runway
                    V4L       4-Box VASI on left side of runway
                    V4R       4-Box VASI on right side of runway
                    V6L       6-Box VASI on left side of runway
                    V6R       6-Box VASI on right side of runway
                    V12       12-Box VASI on both sides of runway
                    V16       16-Box VASI on both sides of runway
                    P2L       2-Lgt PAPI on left side of runway
                    P2R       2-Lgt PAPI on right side of runway
                    P4L       4-Lgt PAPI on left side of runway
                    P4R       4-Lgt PAPI on right side of runway
                    NSTD      nonstandard VASI system
                    PVT       privately owned approach slope
                              indicator light system on a public
                              use airport that is intended for
                              private use only 
                    VAS       non-specific VASI system 
                    NONE      no approach slope light system
                    N         no approach slope light system
                    TRIL      tri-color VASI on left side of
                              runway
                    TRIP      tri-color VASI on right side of
                              runway
                    PSIL      pulsating/steady burning VASI on
                              left side of runway
                    PSIR      pulsating/steady burning VASI on
                              right side of runway
                    PNIL      system of panels on left side of
                              runway that may or may not be
                              lighted
                    PNIR      system of panels on right side of
                              runway that may or may not be
                              lighted
                         where:    SAVASI    simplified
                                             abbreviated visual
                                             approach slope
                                             indicator 
                                   VASI      visual approach
                                             slope indicator
                                   PAPI      precision approach
                                             path indicator
                                   TRI       tri-color visual
                                             approach slope
                                             indicator
                                   PSI       pulsating/ steady
                                             burning visual
                                             approach slope
                                             indicator
                                   PNI       a system of panels
                                             used for alignment
                                             of approach slope
                                             indicator
          Orig:     NFDC

     FIELD 17:
          Name:     BE Apprch Lgt System
          Type:     Character
          Wdth:     8
          Desc:     Approach light system at the base end of the
                    runway.
                    ALSAF     3,000 foot high intensity approach
                              lighting system with centerline
                              sequence flashers
                    ALSF1     standard 2,400 foot high intensity
                              approach lighting system with
                              sequenced flashers, category I
                              configuration
                    ALSF2     standard 2,400 foot high intensity
                              approach lighting system with
                              sequenced flashers, category II or
                              III configuration
                    MALS      1,400 foot medium intensity
                              approach lighting system
                    MALSF     1,400 foot medium intensity
                              approach lighting system with
                              sequenced flashers
                    MALSR     1,400 foot medium intensity
                              approach lighting system with
                              runway alignment indicator lights
                    SSALS     simplified short approach lighting
                              system
                    SSALF     simplified short approach lighting
                              system with sequenced flashers
                    SSALR     simplified short appoach lighting
                              system with runway alignment
                              indicator lights
                    NEON      neon ladder system
                    ODALS     omnidirectional approach lighting
                              system
                    LDIN      lead-in light system
                    MIL OVRN military overrun
                    NSTD      all others
                    NONE      no approach lighting is available
          Orig:     NFDC

     FIELD 18:
          Name:     BE Control Obj Descr
          Type:     Character
          Wdth:     11
          Desc:     Description of the controlling object at the
                    base end of the runway.
                         (e.g., trees, bldg, pline, fence, none)
          Orig:     NFDC

     FIELD 19:
          Name:     BE Cont Obj Mar/Lgt?
          Type:     Character
          Wdth:     4
          Desc:     Whether the controlling object referred to in
                    Field 18 is marked or lighted.
                         M    Marked
                         L    Lighted
                         ML   Marked And Lighted
                         None
          Orig:     NFDC

     FIELD 20:
          Name:     BE Rwy Objects Cat
          Type:     Character
          Wdth:     5
          Desc:     FAA FAR Part 77 (objects affecting navigable
                    airspace) runway category for the base end. 
                         A(V)      utility runway with a visual
                                   approach 
                         B(V)      other than utility runway with
                                   a visual approach 
                         A(NP)     utility runway with a
                                   nonprecision approach
                         C         other than utility runway with
                                   a nonprecision approach having
                                   visibility minimums greater
                                   than 3/4 mile 
                         PIR       precision instrument runway
          Orig:     NFDC

     FIELD 21:
          Name:     Recip End ID
          Type:     Character
          Wdth:     3
          Desc:     Reciprocal end indentifier.  The runway end
                    that relates to the second part of the runway
                    identification (e.g., for runway 18/36 the
                    reciprocal end is 36; for helipads, e.g.,
                    runway H1, this information is blank).  The
                    runway identification is in Field 5. 
          Orig:     NFDC

     FIELD 22:
          Name:     RE True Alignment
          Type:     Character
          Wdth:     3
          Desc:     The true magnetic heading of the reciprocal
                    end of the runway, to the nearest degree 
                    (e.g., for runway reciprocal end 18, could be
                    184).
          Orig:     NFDC

     FIELD 23:
          Name:     RE ILS Type
          Type:     Character
          Wdth:     9
          Desc:     The type of Instrument Landing System (ILS)
                    for the reciprocal end of the runway.  See
                    the Field 14 description of base end ILS type
                    for a description of the entries that can be
                    found in this field.
          Orig:     NFDC 

     FIELD 24:
          Name:     RE AC Arresting Device
          Type:     Character
          Wdth:     6
          Desc:     Type of aircraft arresting device.  Indicates
                    the type of jet arresting barrier  installed
                    at the far end of the reciprocal end of the
                    runway (e.g., MA1, MA1A, BAK9, BAK6, E14,
                    E15, E5, etc.) 

                    See DOD Flight Information Publication
                    (Enroute): IFR - Supplement United States,
                    published by the Defense Mapping Agency
                    Aerospace Center, St. Louis, MO, for code
                    definitions.
          Orig:     NFDC

     FIELD 25:
          Name:     RE Vis Glide Slp Ind
          Type:     Character
          Wdth:     4
          Desc:     Visual glide slope indicators at the
                    reciprocal end of the runway.  See the Field
                    16 description of base end visual glide slope
                    indicators for a description of the entries
                    that can be found in this field.
          Orig:     NFDC

     FIELD 26:
          Name:     RE Apprch Lgt System
          Type:     Character
          Wdth:     8
          Desc:     Approach light system at the reciprocal end
                    of the runway.  See the Field 17 description
                    of the approach light system at the base end
                    of the runway for a description of the
                    entries that can be found in this field.
          Orig:     NFDC

     FIELD 27:
          Name:     RE Control Obj Descr
          Type:     Character
          Wdth:     11
          Desc:     Description of the controlling object at the
                    reciprocal end of the runway.
                         (e.g., trees, bldg, pline, fence, none)
          Orig:     NFDC

     FIELD 28:
          Name:     RE Cont Obj Mar/Lgt?
          Type:     Character
          Wdth:     4
          Desc:     Whether the controlling object referred to in
                    Field 27 is marked or lighted.
                         M    Marked
                         L    Lighted
                         ML   Marked And Lighted
                         None
          Orig:     NFDC

     FIELD 29:
          Name:     RE Rwy Objects Cat
          Type:     Character
          Wdth:     5
          Desc:     FAA FAR Part 77 (objects affecting navigable
                    airspace) runway category for the reciprocal
                    end. 
                         A(V)      utility runway with a visual
                                   approach 
                         B(V)      other than utility runway with
                                   a visual approach 
                         A(NP)     utility runway with a
                                   nonprecision approach
                         C         other than utility runway with
                                   a nonprecision approach having
                                   visibility minimums greater
                                   than 3/4 mile 
                         PIR       precision instrument runway
          Orig:     NFDC

     FIELD 30:
          Name:     Airport Long 
          Type:     Floating Point
          Wdth:     13
          Desc:     The longitude of the runway's airport (the
                    longitude from the companion airports
                    database).
          Orig:     NFDC

     FIELD 31:
          Name:     Airport Lat 
          Type:     Floating Point
          Wdth:     12
          Desc:     The latitude of the runway's airport (the
                    latitude from the companion airports
                    database).
          Orig:     NFDC

     FIELD 32:
          Name:     Rwy Lat/Lon Missing?
          Type:     Coded Character
          Wdth:     1
          Desc:     A code identifying those runways whose
                    lat/longs were missing, incomplete, or in
                    error.
                         1    Missing both sets of runway
                              coordinates.  The National
                              Oceanographic and Atmospheric
                              Administration (NOAA) has not
                              surveyed the runway to obtain the
                              coordinates.
                         2    Missing coordinates at one end. 
                              This occurs at runways that have
                              recently been lengthened (or
                              possibly shortened), and NOAA has
                              not yet surveyed the runway to get
                              the new end coordinates. 
                         3    One or both sets of coordinates in
                              wrong location.
                         4    Same coordinates at both ends.

                    For all runways that had one of the above
                    four problems, runway coordinates in the
                    database were modified as follows.  This
                    modification allows for these runways to be
                    included in the selection of all runways that
                    are part of a given airport based on
                    proximity of the runways to the airport:

                         BE lat  =  RE lat  =  Airport lat
                         BE long  = Airport long  + 200
                         RE long  = Airport long  -  200

          Orig:     Derived from the runway and airport
                    coordinates in the ASCII runways file and
                    from visual observations in the TRANSCAD
                    runways database.

     FIELD 33 and 34:
          Currently unused

     FIELD 35:
          Name:     Number of Shape Points
          Type:     Floating Point
          Wdth:     4
          Desc:     The number of shape points in the runway
                    segment.  Since the runway segments are all
                    represented as straight lines, this number
                    will always have a value of 2.00, i.e., the
                    runway ends (nodes) are the only shape
                    points.
          Orig:     A generated number.

     FIELD 36:
          Name:     BE Long
          Type:     Floating Point
          Wdth:     13
          Desc:     The longitude at the physical end of the
                    runway's base end in decimal degrees.
          Orig:     NFDC

     FIELD 37:
          Name:     BE Lat
          Type:     Floating Point
          Wdth:     12
          Desc:     The latitude at the physical end of the
                    runway's base end in decimal degrees.
          Orig:     NFDC

     FIELD 38:
          Name:     RE Long
          Type:     Floating Point
          Wdth:     13
          Desc:     The longitude at the physical end of the
                    runway's reciprocal end in decimal degrees.
          Orig:     NFDC

     FIELD 39:
          Name:     RE Lat
          Type:     Floating Point
          Wdth:     12
          Desc:     The latitude at the physical end of the
                    runway's reciprocal end in decimal degrees.
          Orig:     NFDC

DISCUSSION

     The 10,036 runways in the database are supposed to include
     all of the runways at the 7,169 airports in the companion
     geographic database, AIRPRT94. 