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The parameters are set in the four tabs: Shoals/Deeps, Saddles, Ridges and Valleys


The Shoals/Deeps tab


Shoals search radius detection

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Specify settings for shoal objects

Specify how to find those grids nodes that are the shallowest within the Minimum distance. The parameters are:

  • Mask width (grid cells): Is a mask moving over the grid and checking the centre node with the nodes around. Default value is 2.
  • Minimum distance (m): A shoal is detected when the centre node is shallower than the rest of the nodes in the mask. After the detection the points are sorted on increasing depth values, and by starting with the first (and shallowest) point, all points with a distance smaller than the Minimum distance will be removed. Then the same test is performed for the next valid point, etc. Default value is 25.

The shoals are saved in <chart name> / classification / shoals_<mask width>_<distance>.

Deeps search radius detection

Will find

 

Specify settings for deep objects

Specify how to find those grids nodes that are the deepest within the Minimum distance. The parameters are:

  • Mask width (grid cells): Is a mask moving over the grid and checking the centre node with the nodes around. Default value is 2.
  • Minimum distance (m): A deep is detected when the centre node is deeper than the rest of the nodes in the mask. After the detection the points are sorted on decreasing depth values, and by starting with the first (and deepest) point, all points with a distance smaller than the Minimum distance will be removed. Then the same test is performed for the next valid point, etc. Default value is 25.

The deeps are saved in <chart name> / classification / deeps_<mask width>_<distance>.

 

Find corresponding Shoals/Deeps in Soundings

This option enables a search in the Soundings dataset for the nearest point that was found in the Seafloor grid. The corresponding points are saved in <chart name> / classification / <type>_in_soundings_<mask width>_<distance>.

 

The Saddles tab

Will Spscify how to find those grids nodes that have two low and two high neighbour points. The parameters are:

  • Mask width (grid cells): A filter moving over the grid and checking the centre node with the nodes around. Default value is 2
  • Minimum depth difference (m):  

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  • The minimum depth difference between the actual node and the neighboring topography. Default value is 0.1.

The search ill find those grids nodes that have two low and two high neighbour points. 

 

Image Added

The search 

 

 

The option Mask width is a filter moving over the grid and checking the centre node with the nodes around.
After the detection the points are sorted on increasing depth values, and by starting with the first (and shallowest) point, all points with a distance smaller than the Filter width will be removed. Then the same test is performed for the next valid point, etc.

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