Find variables available from the NHDPlusV2 attribute data.frame
Calling this function downloads the attribute table to get_vaa_path if it is not already cached there. The table is roughly 260 MB, so this function has no example.
old_dir <- hydrogeofetch_data_dir()
hydrogeofetch_data_dir(file.path(tempdir(), "vaa"))
get_vaa_names()
hydrogeofetch_data_dir(old_dir)get_vaa_names(updated_network = FALSE)logical default FALSE. If TRUE, updated network attributes from E2NHD and National Water Model retrieved from doi:10.5066/P976XCVT .
character vector
The VAA data is a aggregate table of information from the NHDPlusV2
elevslope.dbf(s), PlusFlowlineVAA.dbf(s); and NHDFlowlines. All data
originates from the EPA NHDPlus Homepage
here.
To see the location of cached data on your machine use
get_vaa_path.
To view aggregate data and documentation, see
here