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- Shoal point: The shallowest point (node or sounding) in an area. All surrounding nodes are deeper.
- Deep point: The deepest point (node or sounding) in an area. All surrounding nodes are shallower.
- Saddle point: The shallowest point (node) in a fairway. The surrounding nodes are deeper on two sides and shallower on the two perpendicular sides.
- Ridge point: A break point (node) on a ridge. The surrounding nodes are deeper on three sides and shallower on the fourth side.
- Valley point: A break point (node) in a valley. The surrounding nodes are shallower on three sides and deeper on the fourth side.
Classification points
Set the correct parameters for the selected options and click Execute.
The result is a set of points that tells where the selected classification points are located. The classification points are saved under the <chart name> folder and a <classification>classification folder with the name of the option and the parameters selected.
The parameters are set in the four tabs: Shoals/Deeps, Saddles, Ridges and Valleys
When the correct parameters for the selected options are set, click Execute to perform the points classification.
The Shoals/Deeps tab
Specify settings for shoal objects
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The slope angles towards shallower and deeper terrain are the test criteria for defining the the limit for the slope.
When a candidate is detected, the next check is the contour angle between the grid node and two interpolated points with the same depth value. If the sharpness of the angle is smaller than the value in the parameter, the node is accepted as a ridge point.
The contour angle for ridge and valley points.
After the detection the points are sorted on increasing depth values, and by starting with the first (and shallowest) point, all points within a distance smaller than the Mask width will be removed. All the remaining points ar checked the same way.
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To see all ridge points set Slope angle towards shallower = 1, Slope angle towards deeper = 1 and Maximum contour angle = 180.
Test and tune the parameters to get the proper ridge points.
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The slope angles towards shallower and deeper terrain are the test criteria for defining the the limit for the slope.
When a candidate is detected, the next check is the contour angle between the grid node and two interpolated points with the same depth value. If the sharpness of the angle is smaller than the value in the parameter, the node is accepted as a valley point.
After the detection the points are sorted on increasing depth values, and by starting with the first (and shallowest) point, all points within a distance smaller than the Mask width will be removed. All the remaining points ar checked the same way.
The result is saved inas <chart name> / classification / valleys_'maskwidth'_'shallower angle'_'deeper angle'_'contour angle'.
To see all valley points set Slope angle towards shallower = 1, Slope angle towards deeper = 1 and Maximum contour angle = 180.
Test and tune the parameters to get the proper valley points.
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