Formatting and rescaling water use data for the IWAAs National Report

This software release contains code to create the fractional intersectional weights used to crosswalk data from the National Water Use Program to the National Integrated Water Availability Assessment (IWAAs) projects. The Watershed Boundary Dataset (WBD) contains polygons that define the spatial boundaries of hydrologic units. These are periodically updated as these boundary definitions are refined. When aggregating data from multiple sources that rely on data from the WBD, a situation can occur where different datasets rely on different versions (or "snapshots") of the WBD. This was the case for the IWAAs National Report which relied upon data using a version of the WBD found in the Mainstem Rivers data release (https://www.sciencebase.gov/catalog/item/63cb38b2d34e06fef14f40ad) as well as data that relied upon a version used by the National Water Use Program (https://www.sciencebase.gov/catalog/item/63d31e73d34e06fef1501265). This dataset contains the fraction of spatial overlap (i.e., weights) between the subwatershed (HUC12) boundaries from these two versions of the WBD. These weights can be used as a crosswalk between the two snapshots of the WBD. See https://www.sciencebase.gov/catalog/item/65528d2cd34ee4b6e05c394e and https://code.usgs.gov/RIMBE/general-repositories/rescaling-attributes-r… for other examples of this methodology being used.