query_usgs_geoserver: Query USGS Geoserver

In nhdplusTools: NHDPlus Tools

Query USGS Geoserver

Description

Query the USGS geoserver for spatial data by location, area, or ID.

Usage

query_usgs_geoserver(
  AOI = NULL,
  ids = NULL,
  type = NULL,
  filter = NULL,
  t_srs = NULL,
  buffer = 0.5
)

Arguments

AOI	sf (MULTI)POINT or (MULTI)POLYGON. An 'area of interest' can be provided as either a location (sf POINT) or area (sf POLYGON) in any Spatial Reference System.
ids	character or numeric. A set of identifier(s) from the data type requested, for example if NHD, then a set of COMID(s).
type	character. Type of feature to return ('huc08','huc12', 'nhd', 'catchment', 'waterbodies', 'gagesII'). If NULL (default) a data.frame of available resources is returned
filter	character. An XML filter to pass to httr POST query
t_srs	character (PROJ string or EPSG code) or numeric (EPSG code). A user specified - target -Spatial Reference System (SRS/CRS) for returned objects. Will default to the CRS of the input AOI if provided, and to 4326 for ID requests.
buffer	numeric. The amount (in meters) to buffer a POINT AOI by for an extended search. Default = 0.5

Details

The returned object(s) will have the same Spatial Reference System (SRS) as the input AOI. If a individual or set of IDs are used to query, then the default geoserver CRS of EPSG:4326 is preserved. In all cases, a user-defined SRS can be passed to t_srs which will override all previous SRS (either input or default). All buffer and distance operations are handled internally using in EPSG:5070 Albers Equal Area projection

Value

a simple features (sf) object

nhdplusTools documentation built on Oct. 2, 2023, 5:06 p.m.