Functions to construct a CQL expression to be used
to filter results from bcdc_query_geodata().
See the geoserver CQL documentation for details.
The sf object is automatically converted in a
bounding box to reduce the complexity of the Web Feature Service call. Subsequent in-memory
filtering may be needed to achieve exact results.
EQUALS(geom)DISJOINT(geom)
INTERSECTS(geom)
TOUCHES(geom)
CROSSES(geom)
WITHIN(geom)
CONTAINS(geom)
OVERLAPS(geom)
BBOX(coords, crs = NULL)
DWITHIN(
geom,
distance,
units = c("meters", "feet", "statute miles", "nautical miles", "kilometers")
)
a CQL expression to be passed on to the WFS call
an sf/sfc/sfg or bbox object (from the sf package)
the coordinates of the bounding box as four-element numeric
vector c(xmin, ymin, xmax, ymax), a bbox object from the sf
package (the result of running sf::st_bbox() on an sf object), or
an sf object which then gets converted to a bounding box on the fly.
(Optional) A numeric value or string containing an SRS code. If
coords is a bbox object with non-empty crs, it is taken from that.
(For example, 'EPSG:3005' or just 3005. The default is to use the CRS of
the queried layer)
numeric value for distance tolerance
units that distance is specified in. One of
"feet", "meters", "statute miles", "nautical miles", "kilometers"