Irregular-spaced shoreline position computation

[amoodie]

A function to compute the mean and std dev to the shoreline. This method uses irregular sampling, which makes it relatively straightforward and computationally efficient, but it may not always match user intuition (for example in the presence of an estuary).

I have opened an issue to create a companion function that implements a regular sampling approach (#57).

Todo

• docs
• tests

[codecov]

Codecov Report

Merging #55 (1fcdd85) into develop (626928b) will increase coverage by 0.15%.
The diff coverage is 92.30%.

@@             Coverage Diff             @@
##           develop      #55      +/-   ##
===========================================
+ Coverage    87.33%   87.48%   +0.15%     
===========================================
  Files            9        9              
  Lines         2400     2445      +45     
===========================================
+ Hits          2096     2139      +43     
- Misses         304      306       +2     

Impacted Files	Coverage Δ
deltametrics/plan.py	86.93% <92.30%> (+0.30%)	⬆️
deltametrics/plot.py	89.52% <0.00%> (+0.57%)	⬆️

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[elbeejay]

With the exception of the return portion of the doc-string this looks good to me.

I fiddled with using scipy.ndimage.distance_transform_edt() to calculate distances instead of the method implemented here but my alternative implementations were consistently slower.