In
Configuring Description Keys for Point Import,” you imported survey data that contained points. Points brought in through the methods described in the discussion are referred to as survey points. In the current discussion, you will import points from a delimited text file and place them in the drawing using the point-creation tools. Points created in this manner are referred to as COGO points. The
Figure shows the contextual tab differences between points brought in as COGO points (top) and points brought in through a survey database (bottom).
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| The contextsensitive ribbon reflects similarities and differences between COGO points (top) and survey points (bottom). |
The differences between COGO points and survey points are subtle but important to note. The definition and graphical representation of a COGO point are stored in the drawing. For this reason, its definition can be easily altered at any time, either through its Properties palette or through the tabular view used in Panorama. On the other hand, a survey point has its definition stored within a survey database and its graphical representation stored in the drawing. To change its definition, you need to be able to access its survey database and have the rights to write changes to it. Because of these controls and the legal implications that arise from unwanted changes to the topographic data, the use of survey points and databases is becoming more prevalent in today’s market. Since these points are managed by the survey database, the place to manage any changes to their definition is within the Survey tab of Toolspace.
Regardless of their origin, both COGO points and survey points obey the principles outlined in this discussion.
- COGO Points vs. Survey Points
