Subset pre-formatted HUC files into smaller groupings.

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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 us to include in the subset HUCs where part of the watershed is in the specified state even though the centroid is in a different state.

Usage

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

Arguments

SPDF

a spatial polygons dataframe created using the convertUSGSHUC function

parentHUCs

a character vector specifying one or more containing HUCs

stateCodes

a 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.

Value

a SpatialPolygons Dataframe subsetted to the appropriate specifications.

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