    CANADA LAND INVENTORY LEVEL I LAT/LONG DIGITAL DATA

            DCW TRANSPORTATION AND PLACE NAMES

1. Coverage Specifications

   Original Map Scale: 1:1,000,000

   Resolution        : 1,600 to 7,300 feet, at 90 percent
                       confidence level, according to DCW
                       specifications

   Map Projection    : None, i.e. latitude/longitude

   Datum             : NAD27

   Spheroid          : Clarke 1866

   Units of Measure  : decimal degrees

2. CLI Level I Latitude/Longitude Digital Data

   CLI Level I latitude/longitude digital data are intended
   for GIS users who wish to integrate in CLI thematic data
   with their own topological base maps, i.e. for GIS users
   who wish to "cookie-cut" the CLI thematic layers with
   their own topological shoreline layer.

   CLI Level I thematic data is intentionally extended past
   the shoreline and as such does not contain the proper
   definition of shoreline. The data are not projected and
   coordinates, areas and perimeters are in decimal degrees.

   DO NOT ATTEMPT TO DERIVE AREA STATISTICS FROM THESE DATA
   UNTIL THEY ARE INTEGRATED WITH A PROPER SHORELINE AND THE
   RESULTS PROJECTED TO A SUITABLE MAP PROJECTION.

   If the above restrictions do not meet your GIS objectives,
   obtain the equivalent Level II UTM data with integrated
   base map from the same distribution source.

3.1 Attribute Schema for DCW Transportation Coverage(AAT.DBF)

 a) Standard ArcInfo Arc Attribute Table (AAT) variables:

    FNODE_      Numeric 11,0    From or starting node number
    TNODE_      Numeric 11,0    To or ending node number
    LPOLY_      Numeric 11,0    Left Polygon number
    RPOLY_      Numeric 11,0    Right Polygon number
    LENGTH      Numeric 13,6    Perimeter, in decimal degrees
    COVER_#     Numeric 11,0    ArcInfo Polygon Number
    COVER_ID    Numeric 11,0    ArcInfo User ID

 b) Simplified DCW Transportation Attributes

    LEGEND      Character 25    simplified DCW text legend,
                                as follows:

      Code                      Description

     ROADS                      All DCW road types including
                                primary roads, secondary
                                roads and undifferentiated
                                roads (from the DCW Road
                                Layer).

     RAILROAD                   All DCW Railroad types,
                                including single track,
                                multiple track and light-
                                duty railroads (from the DCW
                                Railroad Layer).

     TRAILS                     All DCW tracks, trails or
                                footpaths (from the DCW
                                Roads Layer).

     BRIDGE,CAUSEWAY or FERRY   Selected DCW transportation
                                structures, including
                                bridges, causeways and
                                ferry routes (from the DCW
                                Transportation Structure
                                Layer).

     CABLE or PIER              Selected DCW cultural
                                landmarks, including piers,
                                wharfs or quays, or aerial
                                cableways (from DCW Cultural
                                Landmark Layer).
    Note(s):

    i)  Most maps will contain roads; some will also contain
        railroads and trails. Few maps contain bridges (or
        causeways or ferry routes) or aerial cableways (or
        piers or wharfs or quays). No single maps contains
        all five feature types.

   ii)  Due to the absence of polygon topology in this
        coverage, Left and Right Polygon Number in the
        standard ArcInfo AAT section are redundant.


3.2 Attribute Schema for DCW Populated Place Names (PAT.DBF)

  a) Standard ArcInfo Point Attribute Table (PAT) variables:

    AREA        Num 13,6    Area, in square degrees
    PERIMETER   Num 13,6    Perimeter, in decimal degrees
    COVER_#     Num 11,0    Standard ArcInfo Polygon Number
    COVER_ID    Num 11,0    Standard ArcInfo User ID


  b) Simplified DCW Place Name Attributes

    PPPTNAME    Char 40     Populated place name, or blank

    Note(s):

    i)  Some names has been left blank; these never-the-less
        indicate the presence of a small populated place.

   ii)  Most names are in lower-case text; major urban areas
        are indicated in capital letters.

  iii)  The latitude/longitude position of the populated place
        is not explicitly defined in the PAT file.

4. Narrative Description of DCW Derived Coverages for CLI

   Selected layers from the Digital Chart of the World (DCW)
   were originally conceived as a cartographic enhancement
   to the GeoGratis Canada Land Inventory (CLI) delivery
   mechanism, i.e. as a cartographic enhancement to the
   quick-look GIF and WMF files which make part of such data
   delivery mechanism. While DCW data for Canada is already
   a public domain product, the work required for the above
   objective has lead to this distribution of selected layers
   for selected areas (the CLI area) on a 1:250,000 National
   Topographic Series (NTS) map basis.

   The DCW digital data product in it's original state is
   organized on a 5-degree by 5-degree basis. Selected layers
   have also been organized and are being distributed on a
   provincial basis. The only difference between this
   and other distribution offerings is that the selected
   layers are organized on an NTS map sheet basis.

   As part of the re-organization on a provincial basis,
   selected elements (features) from selected layers dealing
   with transportation have been combined to form a
   comprehensive 'transportation' layer. This transportation
   layer is based on Revision 4 of the DCW-VMAP data product.
   The simplified 'roads' layer in this distribution was
   compiled from Revision 4 of the DCW-VMAP data.

   Only the attribute schema of the DCW transportation layer
   has been modified (simplified) as part of the
   generalization; the coordinates of the road network and
   other transportation features have not been modified. The
   result is a simplified legend containing only five basic
   and unqualified transportation features.

   The populated place name were also revised but the
   'placename' layer in this distribution is based on the
   original DCW (Edition I) digital data product. The
   revisions made to place names (mainly in Northern Canada)
   were not deemed beneficial to the CLI objective.

   As part of the restructuring of the DCW place names, some
   place names have been corrected for spelling; others have
   been added to ensure that most NTS sheets have at least
   one point of reference. In general however, the place
   names are the same subset found on the original DCW
   digital data product.

   The user is referred to the original DCW data product, or
   to the VMAP-Revision 4 public distribution product, for
   more details of the DCW product specification.

5. Accreditation/Copyright

     The Canada Land Inventory extraction and distribution is
     managed by:

     The Canada Centre for Remote Sensing
     Natural Resources Canada
     Government of Canada
     Room 650 - 615 Booth Street
     Ottawa, ON, Canada
     K1A 0E9

     Based on significant research and development by:

     The National Archives of Canada
     Statistics Canada
     Agriculture and Agri-Food Canada

     Data processing completed by Spatialanalysis, Ottawa, ON, Canada.

     The National Archives of Canada retains intellectual property.

     (Copyright) Her Majesty the Queen in Right of Canada, 1999.
