isobath

A GUI tool for computing slope angles along depth contours (isobaths) from NetCDF bathymetry data.

Features

• Load NetCDF bathymetry files and interactively select a region of interest
• Visualise depth contours on a map
• Compute slope angles at each coordinate interval along a chosen isobath using linear regression
• Step through intervals with Previous / Next navigation
• Remove outlier points using a lasso selector and recompute
• Export results as a two-column text file (coordinate, angle)

Installation

pip install isobath

Usage

Launch the GUI from the terminal:

isobath

Or run as a module:

python -m isobath

Workflow

1. Click Open to load a NetCDF file, or Sample File to load the bundled example dataset.
2. In the Area Selector window, choose the variable and its latitude/longitude dimensions, then draw a rectangle to subset the region of interest.
3. In the Settings panel (right dock), set the Contour Depth and adjust the coordinate axis, start/end points, averaging interval, and coordinate interval.
4. Click Compute Angle to perform the first linear regression and view the slope angle.
5. Use Next / Previous to step through coordinate intervals.
6. Use Lasso to select outlier points, then Delete to remove them and recompute. Undo restores the previous point set.
7. Click Save or Save As to export the results.

Output

Results are saved as a plain text file with two columns:

coordinate   angle (degrees)
8.0000       127.4396
9.0000       125.5481
...

Dependencies

• PyQt6
• matplotlib
• numpy
• netCDF4
• scipy

License

MIT License. See LICENSE for details.

Note

Claude (Anthropic) was used to assist with refactoring, bug fixing, and packaging of this project.