Introduction
UNCLOS Article 76 states that "The coastal State shall delineate the outer limits of its continental shelf, where that shelf extends beyond 200 nautical miles from the baselines from which the breadth of the territorial sea is measured, by straight lines not exceeding 60 nautical miles in length, connecting fixed points, defined by coordinates of latitude and longitude."
At this point we have created all the formula lines and constraint lines and we can proceed to construct the final outer limit. The construction of outer limits is (obviously) a complex operation . Sometimes but the Generate Outer Limit tool is designed to assist you in the best possible way. The tool lets you digitize and combine line segments and keep distances between points less than 60M. Sometimes it is best to do this area by area and in multiple steps, then combining points into one or more final outer limits. Sometimes the outer limit line may be constructed from a combined formula line and a combined constraint line.The ultimate construction may still be a complex logical and strategical operation. The Geocap Final Outer Limit tool is designed to digitize to combine line segments and keep distances between points less than 60M. In many cases the best approach is to construct and outer edge line consisting of only Hedberg points, Gardiner points and the 200M line, and then construct a constraint line consisting of the 350M line and the 2500m + 100M isobath. These two lines can then be combined into one final outer limit.
Exercises
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The Outer Limit Menu
The "Outer Limit Menu" is used in order to select the final outer limit points from the formula and constraint lines. You may open the outer limit menu by right-clicking on the project folder This command is available from the folder 4. Outer limit and selecting Generate Outer Limit.
The Outer Limit MenuThe blue question mark in the top right corner of this menu contains instructions on how to use this menu.
The folders in the Outer Limit menu correspond to the sub folders in 4. Outer limit. You will also be able to see the datasets in this list. Before opening this menu, you can copy the files you want to use in your outer limit to the correct folders.
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