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    Autodesk GIS Design Server

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    New Member
    Posts: 1
    Registered: ‎04-29-2004

    GML command retrieve_travel and coordinate systems

    104 Views, 0 Replies
    04-29-2004 01:16 PM
    Issue
    When a database uses different coordinate systems for storage and input/output, the GML command retrieve_travel ignores the measurement unit given.

    Solution
    Meters are the hard-coded default for all latitude/longitude-derived coordinate systems. Therefore, it is necessary to convert the travel distance to meters when you are using different coordinate systems for the storage and input/output of your data.
    This can be done either by multiplying by a known scaling factor, or using the GML command retrieve unit_conversion as follows:
    setup coordinate system {fe_ll};
    retrieve unit_conversion length for $distance_feet into distance_metres;
    setup coordinate system {fe_lc};
    Please use plain text.