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Introduction

Official lines of jurisdiction can be imported into Geocap. See the import chapter for more about this. These lines can be displayed and used as a basis for further calculation in Geocap. If such lines do not exist, Geocap can produce lines from a line describing the coastline.

 

Info

Note that our Maritime Zones plugin extends the Shelf package with additional capabilities for calculating maritime zones.

It works directly with ArcGIS feature classes and can calculate any maritime zone from both normal and straight baselines.
The calculation also extracts critical points for each zone and store them in a feature class. Read more about the Maritime Zones plugin

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Geocap can calculate midlines between two or more countries. The command Generate midline can be found on the baseline schema. 
 

Calculation Area

The midline will be generated inside calculation area. This area has to be set before you execute the command.

  • Scale to input - will compute the midline in a bounding box containing all the input datasets. 
  • Scale to active window - will scale to your active window
  • Specify - lets you manually define a calculation area either by typing in values, or by using Rubberband select.

Base point weights

Midlines can be weighted by putting weights on the base line points. The weights should be stored as point field data on the base line datasets with the name "Weight". The weights will only be used if the checkbox use base point weights is checked. A base line without weights will get a default weight of 1.0 for all base points.

Base point connection polygons
By checking Generate basepoint connection polygon you will get a dataset which shows polygons pointing back to the critical basepoints that contributed to the midline. 

Tri-point

A Tri-point is a point on the mid-line which has an equal distance to three base points. These are the turning points of the midline. Geocap will automatically detect the tri points and include them in the midline. You can get information about the tri-points in the table view of the midline. The table has columns with distances, an accuracy estimate, and information about which base points are used in the mid-point and tri-point calculation.

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