sc_get_comid | R Documentation |
Function to return NHDPlusV2 COMIDS using either a dataframe with coordinates and a specified CRS or an sf object. The function generates a vector of COMID values a user can then pass to sc_get_data function
sc_get_comid(dd = NULL, xcoord = NULL, ycoord = NULL, crsys = NULL)
dd |
Name of data frame object. Can be a simple data frame with coordinate columns in a known CRS or an sf points data frame |
xcoord |
The x coordinate column if using a raw data frame |
ycoord |
The y coordinate column if using a raw data frame |
crsys |
The epsg code if using a raw data frame |
A new sf data frame with a populated 'COMID' column
Marc Weber
dd <- data.frame(x = c(-122.649,-100.348,-75.186,-106.675),
y = c(45.085, 35.405,42.403,38.721))
comids <- sc_get_comid(dd, xcoord='x',
ycoord='y', crsys=4269)
dd <- sf::read_sf(system.file("shape/nc.shp", package="sf"))
comids <- sc_get_comid(dd)
comids <- sc_get_comid(dd, xcoord='x',
ycoord='y', crsys=4269)
dd <- sf::read_sf(system.file("shape/nc.shp", package="sf"))
comids <- sc_get_comid(dd)
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