MazamaSpatialUtils (version 0.7.6)

subsetHUC: Subset pre-formatted HUC files into smaller groupings.

Description

A SpatialPolygons Dataframe is broken into smaller pieces based on HUC code or state. The SpatialPolygons Dataframe must have the required fields 'stateCode', 'HUC', and 'allStateCodes' and is intended to come from the convertUSGSHUC() function. The difference between stateCode and allStateCodes is that stateCode has just one two-digit ISO code while allStateCodes can have more than one. This allows the subset to include HUCs where part of the watershed is in the specified state even though the centroid is in a different state.

Usage

subsetHUC(
  SPDF = NULL,
  parentHUCs = NULL,
  stateCodes = NULL,
  allStateCodes = NULL
)

Value

a SpatialPolygons Dataframe subsetted to the appropriate specifications.

Arguments

SPDF

a spatial polygons dataframe created using the convertUSGSHUC function

parentHUCs

Character vector specifying one or more containing HUCs.

stateCodes

Character vector specifying one or more containing states.

allStateCodes

Similar to stateCode, but will also include HUCs who touch the state but whose centroid is in a different state.