Ability to separate inner and outer shoreline

[dbuscombe-usgs]

Currently we have a global reference shoreline that does not discriminate between inner (interior) and outer (ocean side) shorelines. Therefore, when transects intersect, we either get 1 time-series, or two. When two, we need an ability to separate the inner and outer shorelines. Perhaps the best way is to have two versions of reference shoreline.

I have been exploring ideas to reliably do this and will post here.

When we have two separate shorelines (inner and outer), or an attributed shoreline, we could explore the best workflow to use this information

[dbuscombe-usgs]

I started to play with the idea of creating layers that would split the shoreline into two parts, but it is proving quite tricky. Upon reflection, perhaps the easiest way to implement this is to do the following

1. find transects that have more than one shoreline intersection - the subset of those transects are those that have interior and exterior shorelines
2. use a cluster algorithm to examine that subset for two clusters, i.e. interior and exterior
3. when creating transect-based shorelines, create separate output csvs for the interior and exterior shorelines

[dbuscombe-usgs]

With the latest shoreline filtering method built into https://github.com/Doodleverse/CoastSeg/releases/tag/v0.0.72, we no longer need to be able to programmatically separate shorelines. Instead, the user can select them and delete them. Much better!

I feel like I can close this issue