Distance to the nearest coast

[korvinos]

Problem

The distance to the nearest coastline is a kind of information which highly used in the satellite data processing (masking observations). Adding this functionality (i.e. ability to get a distance to the nearest coast for each pixel in a given domain) would be very useful.

Solution

NASA OBPG provides the open-source product (https://oceancolor.gsfc.nasa.gov/docs/distfromcoast/) which could be integrated along with the MOD44W product.

TODO

• [x] Develop a method (see watermask) in the nansat.tools
• [x] Add a recipe to documentation about getting auxiliary data
• [x] Tests

[korvinos]

The proposed approach produces a so-called "circular dependency import" issue due to circular calling of the nansat.tools and nansat.domain or nansat.nansat modules. Therefore the nansat.tools must be separated between the nansat.tools and the nansat.utils to avoid this problem (also in the future).

• [x] Define functions that are imported by other nansat modules and move them to the nansat.utils.
• [x] Refactor all package according to the new structural changes
• [x] Raise warning every time method replaced to utiles is called from tools

[akorosov]

Hi @korvinos , what's the status here? I'd like to move plot_domain_map to nansat.tools

[akorosov]

Do you mind if I make a branch from https://github.com/nansencenter/nansat/commit/7010020771460fbe0a8002691845a87426bb49df

And then we can merge it into develop (with a PR, etc)?

Then I make another branch for my development and then I can add tools and add some functions that use Nansat.

[korvinos]

@akorosov actually it should works (when I run all tests locally) However the Travis fails. Maybe you could have a look on the log of travis, please? Once it is resolved I could merge it

[korvinos]

closed in #461