Query USGS Geoserver
Query the USGS geoserver for spatial data by location, area, or ID.
query_usgs_geoserver( AOI = NULL, ids = NULL, type = NULL, filter = NULL, t_srs = NULL, buffer = 0.5 )
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 |
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's (either input or default).
All buffer and distance operations are handled internally using in
EPSG:5070 Albers Equal Area projection
a simple features (sf) object
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