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Introduction

The Maritime Zones plugin available with Geocap 6.5 extends the Shelf package with additional capabilities for calculating maritime zones:

  1. The plugin works directly with ArcGIS feature classes and sits on top of the Datalink for ArcGIS  plugin. It uses the familiar ArcGIS Table of Contents, ArcMap 2D view and toolbars found in ArcGIS desktop.
  2. It provides an easy to use wizard that lets you setup calculation parameters for the 3M, 12M, 24M and 200M distance lines. You can also calculate arbitrary distances.
  3. The calculation takes into account straight baselines if these are attributes in the feature class
  4. The results are stored as new feature classes and be efficiently examined using the embedded ArcGIS tools or saved as a mxd map document for further processing in ArcGIS.
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  • If the nearest point is a normal baseline point, the distance point position is set accurately with the desired distance from the normal base point.
  • If the nearest point is one of the resampled straight baseline points from step 1. The resampled points are ignored, and a new position is calculated from the geodesic between the end points of the straight baseline.

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Figure 2: This is an example of a topology error fixed in step 5. The initial contour is the red line. The black line is the corrected line.. 

5. The limit line is checked for topology error


The limit line may at this point contain some topology errors due to the contouring in step 3. The contouring algorithm may do wrong connections of the limit line in areas where two distance line arcs should not intersect, but are very close to each other. In these areas, the limit line is regenerated repeating steps 2, 3 an 4, within a small area with a much smaller point spacing. 

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Figure 2: This is an example of a topology error fixed in step 5. The initial contour is the red line. The black line is the corrected line..

6. Equidistant points are inserted

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