Setting Coordinate System for Warehouse

During digitization, Geo Media Professional creates a default coordinate system for screen display purposes. Specifying a new coordinate system provides a way to project the default coordinate system to the original geographic coordinate system of the map being digitized. This will involve specifying the map’s projection system, its coordinates and the geodetic datum. To create a new warehouse coordinate system:
    1. Click on WAREHOUSE option on the Menu Bar
    2. Click on WAREHOUSE COORDINATE SYSTEM
    3. Click on APDATA Warehouse Connection
    5. Click on OK
Set the Projection System
(Projection is a geographic measurement of an area or distance on the 3-D curved surface of the earth projected onto a flat (2-D) surface).
    1. Select PROJECTION as the Base Storage Type for the Warehouse Coordinate system
    3. Click on the PROJECTION SPACE tab of the Warehouse Coordinate system Dialogue Box. This allows selection of a projection algorithm and definition of projection parameters that are unique to the selected algorithm
    5. Click on the PROJECTION ALGORITHMS. Select POLYCONIC from the displayed list as the projection algorithm for the current project as this is the standard for maps prepared by Survey of India
    6. Click on the PROJECTION PARAMETERS option to specify the parameters for the selected projection algorithm:

      Type the coordinates (long, lat) of chosen origin (say Nalgonda) (longitude=79:16:00 and Latitude = 17:03:00 for the AP Districts map to be digitized. These represent a location roughly the mid region of the map). Let correction factors False X and False Y remain at default value of 0.


    7. Click OK
    8. Click on the GEOGRAPHIC SPACE tab in the Warehouse Coordinating System dialogue box to select the map’s associated datum and reference ellipsoid

      Click on the Geodetic datum option to get drop-down list of available datum. (geodetic datum is a precise location of the ellipsoid relative to the earth's surface and a network of control points . This definition usually includes the origin point of the ellipsoid, its orientation, and the radius and eccentricity of the ellipsoid)

      Select the INDIAN 1975 as geodetic datum for the current warehouse coordinate system as this is the standard for Indian maps
    10. Click on OK