• The Geographic Base used by GIS Andes covers the 7 Andean countries between lat. 15 N and 60 S and long. 60 and 85 W (i.e. Venezuela, Colombia, Ecuador, Peru, Bolivia, Chile and Argentina), and was obtained from the Digital Chart of the World (DCW) developed by  ESRI.
  • The projection is Transverse Mercator - Spheroid WGS 84 for which the:
    • Reference meridian = - 72
    • Scale Factor = 0.99960
    • Reference Latitude = 0
    • False Easting = 5,000,000
    • False Northing = 0
  • The Digital Chart of the World is a comprehensive 1:1,000,000-scale vector basemap of the world that contains geographic, attribute, and textual data that can be accessed, queried, displayed and modified with ARC/INFO software. The database was originally developed by ESRI in Vector Product Format (VPF) for the United States Defense Mapping Agency (DMA). The primary source for the database is the DMA Operational Navigation Chart (ONC) series that are produced by Australia, Canada, the United Kingdom and the United States.
  • The thematic layers of the DCW are:

    1. Political/Oceans
    2. Populated Places
    3. Railroads
    4. Roads
    5. Utilities
    6. Drainage
    7. Drainage-Supplemental
    8. Hypsography
    9. Hypsography-Supplemental
    10. Land Cover
    11. Ocean features
    12. Physiography
    13. Aeronautical
    14. Cultural Landmarks
    15. Transportation structure
    16. Vegetation
    17. Data Quality

of which GIS Andes used:
Layer number and name Theme abbrev. Coverage name* (and type) Attribute table GIS Andes
1. Political/Oceans PO PONET PAT 5push.gif
2. Populated Places PP PPPOLY PAT 5push.gif
PPPOINT PAT 5push.gif
3. Railroads RR RRLINE AAT 5push.gif
4. Roads RD RDLINE AAT 5push.gif
5. Utilities UT UTLINE AAT 5push.gif
(Code 1 only)
6. Drainage DN DNNET PAT 5push.gif
DNNET AAT 5push.gif
 * The coverage names begin with a two-letter abbrevation of the layer (e.g. PO) and end with the type of graphic primitive (POINT, LINE, POLYgon, and NET) used to represent geographic features in that coverage — NET is the abbrevation of Network, for a coverage containing both lines and polygons.