View source: R/getSpatialData.R
getSpatialData | R Documentation |
All locations are first converted to SpatialPoints
objects. The st_intersects
function is then used to determine which
polygon from SFDF
each location falls in. The dataframe row associated
with each polygon is then associated with each location.
getSpatialData(
longitude = NULL,
latitude = NULL,
SFDF = NULL,
useBuffering = FALSE,
verbose = FALSE
)
longitude |
Vector of longitudes in decimal degrees East. |
latitude |
Vector of latitudes in decimal degrees North. |
SFDF |
sf dataframe with MULTIPOLYGON geometry. |
useBuffering |
Logical flag specifying the use of location buffering to find the nearest polygon if no target polygon is found. |
verbose |
Logical flag controlling detailed progress statements. |
For coastal locations, locations may lie just outside the boundaries
of an individual polygon, especially if it is of low resolution.
To account for this any location that remains unassociated after the first
pass is checked to seee if it is with a specific distance of any polygon.
The set of distances is gradually increased until a polygon is reached or the
maximum distances is encountered. Distances include: 1km, 2km, 5km, 10km,
20km, 50km, 100km, 200km. If a location is more than 200km away from any
polygon, a data frame record with all NA
s is returned for that
location.
Missing or invalid values in the incoming longitude
or latitude
vectors result in records with all NA
s at those positions in the
returned data frame.
Dataframe of data.
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