mainstems workflow: HU12 NHDPlusV2 NHDPlus HiRes Matching

HU12 NHDPlusV2 NHDPlus HiRes Matching
The logic encoded in this repository is documented in:

Blodgett, D., Johnson, J. M., Sondheim, M., Wieczorek, M., Frazier, N. (2021). Mainstems: A logical data model implementing mainstem and drainage basin feature types based on WaterML2 Part 3: HY Features concepts. Environmental Modelling and Software, 135. https://doi.org/10.1016/j.envsoft.2020.104927

This repository holds a workflow meant to match NHDPlus and Watershed Boundary Dataset networks to each other.
The following datasets are matched to eachother in the workflow outputs:

NHDPlusV2 Flowlines and NHDPlusV2 Snapshot HUC12
NHDPlusV2 Flowlines and 2021 Snapshot HUC12
NHDPlusV2 Flowlines and RF1
NHDPlusV2 Flowlines and 2020 Snapshot NHDPlusHR
NHDPlusHR Flowlines and 2021 Snapshot HUC12

A single summary output contains one row per mainstem in NHDPlusV2 and all matched mainstems from other datasets.
A sub workflow to conflate a global flowpath dataset (MERIT Basins) to Natural Earth and NHDPlusV2 river geometry in order to derive names is also included.
Data releases for all outputs except those involving NHDPlusHR can be found here: https://www.sciencebase.gov/catalog/item/60cb5edfd34e86b938a373f4 and here https://www.sciencebase.gov/catalog/item/614a8864d34e0df5fb97572d