findNHD: Find National Hydrography River Networks

In mikejohnson51/nwmRetro: nwmRetro

Description

findNHD returns a SpatialLinesDataframe of all NHDFlowlines reaches within an AOI. Data comes from the USGS CIDA server and contain 90 attributes, perhaps most notably:

• 'comid' : integer Integer value that uniquely identifies the occurrence of each feature in the NHD

• 'reachcode' : character Unique identifier for a ‘reach’. The first eight numbers are the WBD_HUC8

• 'fdate': POSITct Date of last feature modification

• 'gnis_id' : character Unique identifier assigned by GNIS

• 'gnis_name' : character Proper name, term, or expression by which a particular geographic entity is known

• 'lengthkm' : numeric Length of linear feature based on Albers Equal Area

• 'areasqkm' : numeric Area of areal feature based on Albers Equal Area,

• 'flowdir' : character Direction of flow relative to coordinate order.

• 'wbareacomi' : integer The COMID of the waterbody through which the flowline flows.

• 'ftype': character unique identifier of a feature type

Usage

findNHD(AOI = NULL, comid = NULL, nwis = NULL, streamorder = NULL,
  name = NULL)

Arguments

AOI	A Spatial* or simple features geometry, can be piped from getAOI
comid	Search for NHD features by COMID
nwis	Search for NHD features by NWIS ID
streamorder	filter returned NHD by steamorder. Returns are feature of input and higher.
name	Seach for NHD by GNIS name

Value

a list() of minimum length 2: AOI and nhd

Author(s)

Mike Johnson

Examples

## Not run: 
nhd  = getAOI(clip = list("Tuscaloosa, AL", 10, 10)) %>% findNHD()

## End(Not run)

mikejohnson51/nwmRetro documentation built on Nov. 8, 2019, 9:57 p.m.