It is important to understand two prerequisites of this case study: - The text describes convenient digitizing elements and how to use them properly. The line can be done with other choices especially in the 1% sediment thickness part. See below for an alternative digitizing.
- The digitizing is performed to get a preliminary result. The final result is done by carefully closing bays with lines up to 60 mile of length. This can be done interactively with the command Maximize outer limit. This command object requires a Geocap version of 4.3.7 or higher. There is a complete explanation of that procedure in the text Maximizing the Outer Limit Line.
As indicated in the exercise the digitizing could have been performed consequently to start at the 200 mile line and ending at the 200 mile line without including that line. The outer limit line would then have to be digitized in two parts for the Atlantis demo project. This was also done in another quick exercise and the result is displayed in the left and right pictures. The digitized line in the area of the 1% sediment thickness was optimized a little bit better which illustrates the complexity and planning of a proper outer limit line generation. |