Within the datasource, there are various types of parameters called "objects" that you can define and combine into Coordinate Reference System Definitions, as well as Transformations between those objects. For information on a specific type of object, please see:
- Angular Unit Definitions
- Linear Unit Definitions
- Ellipsoid Definitions
- Prime Meridian Definitions
- Area of Use Definitions
- Point Style Definitions
- Datum Definitions
- Coordinate Transformation Definitions
- Coordinate System Definitions
When editing the geodetic datasource, an Audit Trail is recorded to track the changes that have been made. For information on this, please see:
When browsing through
the datasource, some objects may be flagged with a red exclamation point
symbol. This means that the object's definition is dependent on files that are missing or not yet downloaded, and it will be unusable until the supplementary files are added. Some
of these are available at our website (http://www.bluemarblegeo.com),
while others are proprietary and must be purchased from a specific government
agency.
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