get_vaa | R Documentation |
Return requested NHDPlusv2 Attributes.
get_vaa( atts = NULL, path = get_vaa_path(), download = TRUE, updated_network = FALSE )
atts |
character The variable names you would like, always includes comid |
path |
character path where the file should be saved. Default is a persistent system data as retrieved by nhdplusTools_data_dir. Also see: get_vaa_path |
download |
logical if TRUE, the default, will download VAA table if not found at path. |
updated_network |
logical default FALSE. If TRUE, updated network attributes from E2NHD and National Water Model retrieved from doi: 10.5066/P9W79I7Q. |
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
data.frame containing requested VAA data
## Not run: # This will download the vaa file to the path from get_vaa_path() get_vaa("slope") get_vaa(c("slope", "lengthkm")) get_vaa(updated_network = TRUE) get_vaa("reachcode", updated_network = TRUE) #cleanup if desired unlink(dirname(get_vaa_path()), recursive = TRUE) ## End(Not run)
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