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Visualize COCOA

Source: vignettes/cocoa.Rmd
cocoa.Rmd

Visualize COCOA

Author: Moritz Shore ()

Date: March, 2026

This tool allows you to visualize the Contiguous Object Connectivity Approach (COCOA) of SWATbuildR and the OPTAIN project, which you can read more about here:

https://www.optain.eu/sites/default/files/delivrables/OPTAIN%20D4.2%20-%20Modelling_Protocols.pdf

The tool is simple to use if you have the prerequisites:

  1. A SWAT+ project created using SWATbuildR
  2. the ‘land_connections_as_lines.shp’ file generated by this code

Please see the documentation of the function(s) for further details and notes.

require(miljotools)
cocoa_hru(
  hru_id = 10,
  buildR_dir = "../SWAT-skuterud/project_data/SWATbuildR/skuterud_buildR/",
  agri_pattern = "a_",
  directory = "../SWAT-skuterud/project_data/figures/connectivity",
  save_to_png = F,
  verbose = T
)

Which would get you a plot that looks something like this:

You can also interactively plot ALL HRUs using the following function:

cocoa_vis(
  buildR_dir = "../SWAT-skuterud/project_data/SWATbuildR/skuterud_buildR/",
  RERENDER = TRUE,
  directory = "../SWAT-skuterud/project_data/figures/connectivity",
  verbose = TRUE
)

This can take quite a while, therefore the RERENDER flag exists, thus you only need to render all the plots once, and can generate the interactive map without re-rendering (RERENDER = FALSE). This can give you an interactive map which can look somewhat like this:

The function can be improved in the following way:

  1. Expand the land use legend
  2. Incorporated connectivity of water objects
  3. Faster plotting?
  4. …