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F.5.e.  Chart Updating
 Table 10-2 provides a capsule summary of the type of information useful for the chart updating mission together with the likelihood of aerial observation of the items.  Aircraft may detect and identify changes in many of the objects (e.g., bridges, dikes and levees, jetties and breakwaters, marinas, dry docks, utility lines, docks, landmarks, towers, etc.) that should be reported, although technical details and measurements may need to be gathered by a ground follow-up survey.  In these cases, aircraft observation is used to detect and identify items relevant for chart correction, but additional “ground truth” information is also needed.  On a typical chart updating mission or multi-mission patrol, observers will annotate appropriate charts with the approximate location of items of interest for later reporting.
 

 
 
Table 10-2 Chart Correction/Updates
 
Object
 Item to be Reported
 Likelihood of Aerial Observation
 
Airports, landing strips
 New or discontinued.
 New airfields are relatively easy to identify.  Abandoned fields or runways marked with an “X” are easy to detect.
 
Bridges
 New, removed, under construction, or ruins.  Give location, type, lights, and vertical and horizontal clearances.
 Many of these items can be easily seen from an aircraft.  Clearance data requires ground survey.
 
Cables
 Over or under navigable waters.  Give location, type, and clearances.
 Pylons for overhead cables are relatively easy to detect.  Clearance data requires a ground survey.
 
Channels
 New or revised channels.  Indicate centerline, controlling depth and width discrepancies for existing channels other than Corps of Engineers’ project channels.
 Changes in the flow pattern of a channel are often visible from the air.  Depths and other information require ground based follow-up effort.
 
Coast Guard Station
 New, discontinued, or change in facilities.
 Best handled administratively rather than by aerial observation.
 
Cribs and water intakes
 Visible or submerged.  Give size and type of construction and depth if submerged.
 General features visible.  Ground follow-up necessary for technical and measurement data.
 
Dams
 Type, position, lights, and other pertinent data.
 New construction easily visible.
 
Dikes and levees
 Type, height, and extent.
 New construction easily visible.
 
Dolphin and other pilings
 Visible or submerged.
 Large objects are easy to detect.
 
　
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