If you are opening an issue regarding an existing notebook/code or the webpage just ignore the instructions below.
If you want to suggest a notebook for the code gallery please answer these questions:

• What is language(s) for used in the example?
• Is it focused on a particular module/software or an IOOS data service?
• Can you provide a minimum example of the expected code and results in a notebook?

Please provide a detailed description of the suggested example below:
Bathymetry contours on a map. Puerto Rico PRCRMP has a Demo of MBON portal. I would like to do something where we bring the coral data in and include bathymetry contours, somewhat repeating the PRCRMP demo - benthic portion of the demo. The product can be found at https://mbon.ioos.us/#data/1 in MBON portal. I don’t want to repeat the effort, but I’d like to do something with these data.
Example making contour map from netCDF data at NCEI:

import xarray as xr
url = 'https://www.ngdc.noaa.gov/thredds/dodsC/regional/northern_california_36_msl_2005.nc'
ds = xr.open_dataset(url)  
ds.Band1.plot.contour(levels=50)

Initial steps:

1. Ingest PRCRMP data from OBIS (using robis in R)
2. Get bathymetry data (using Python)
3. Translate R response into Pythonese.
4. Make interactive graphics

xref: ioos/notebooks_demos#378