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Introduction
CUBE (Combined Uncertainty and Bathymetric Estimator) is an error-model based, direct DTM generator that estimates the depth plus a confidence interval directly on each node point. The CUBE library is developed by University of New Hampshire.
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The output of the command is a depth surface named cube_depth_surface. The surface can also contain additional attributes like Uncertainty, DepthHypotheses and HypothesisStrength dependent on the selected options in the dialog.
The content of the menu
The CUBE dialog for multibeam data and CUBE for XYZ data in a Soundings folder.
Input Data
The Input data part of the dialog is where to select which data items to be gridded. The CUBE command works with both multibeam data (Survey Line) and with XYZ data (Dataset). Select data items from the list.
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The Coordinate System field shows the type of coordinate system for the data.
Cube Algorithm Parameters
The Cube Algorithm Parameters part is where to specify parameters for the CUBE depth processing. The parameters to set:
- Depth Estimation Algorithm
- Grid increments
- Error Distribution Model Algorithm
Depth Estimation Algorithm
The options for the depth estimation algorithm are:
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- HyperCUBE super-grid: The HyperCUBE super-grid is creating a grid based on several hypotheses from the depth data. In addition to the depth grid this algorithm can also create the attributes Uncertainty, DepthHypotheses and HypothesisStrength as output in the cube_depth_surface.
This depth estimation algorithm is implemented for multibeam data only. This algorithm is currently not available in Geocap Seafloor.
Grid increments
Specify the increments:
- X Increment (m): Specify the increments in X-direction (Easting) for the result grid.
- Y Increment (m): Specify the increments in Y-direction (Northing) for the result grid.
The lower left corner and the upper right corner of the result grid will be rounded down and up to contain the increments. (A 5 meter grid increment result in a lower left corner starting on an integer value of 5 meter.)
Error Distribution Model Algorithm
Specify the type of the error distribution
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- Special Order: Areas where under-keel clearance is critical.
- Order 1a: Areas shallower than 100 meters where under-keel clearance is less critical, but features of concern to surface shipping may exist.
- Order 1b: Areas shallower than 100 meters where under-keel clearance is not considered to be an issue for the surface shipping expected to transit the area
- Order 2: Areas generally deeper than 100 meters where a general description of the sea floor is considered adequate.
Output
Select options for what output to create.
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- Hypothesis Strength Surface: When using the depth estimation algorithm HyperCUBE super-grid this option can be checked. The HypothesisStrength values will be an attribute in the cube_depth_surface. Since the algorithm HyperCUBE super-grid is currently not available, this output will not be possible.
The Results
After executing the volumetrics a dialog will pop up showing the parameters, result and volumes from the calculations. The report itself is saved in the project structure in a folder named Reports under the same folder as the command is executed from. The report itself is named as YYYYMMDD CUBE (the name of the executed command).
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