mexdolphin_sf | R Documentation |
This a version of the mexdolphins
dataset from the package dsm
, reformatted
as point process data for use with inlabru
, with the parts stored in sf
format.
The data are from a combination of several NOAA
shipboard surveys conducted on pan-tropical spotted dolphins in the Gulf of Mexico. 47 observations
of groups of dolphins were detected. The group size was recorded, as well as the Beaufort sea state at
the time of the observation. Transect width is 16 km, i.e. maximal detection
distance 8 km (transect half-width 8 km).
mexdolphin_sf
A list of objects:
points
: An sf
object containing the locations of
detected dolphin groups, with their size as an attribute.
samplers
: An sf
object containing the transect lines
that were surveyed.
mesh
: An fm_mesh_2d
object containing a Delaunay triangulation
mesh (a type of discretization of continuous space) covering the survey region.
ppoly
: An sf
object defining the boundary of the
survey region.
simulated
: A sf
object containing the locations of a
simulated population of dolphin groups. The population was simulated from a inlabru
model fitted to the actual survey data. Note that the simulated data do not have any associated
size information.
Library dsm
.
Halpin, P.N., A.J. Read, E. Fujioka, B.D. Best, B. Donnelly, L.J. Hazen, C. Kot, K. Urian, E. LaBrecque, A. Dimatteo, J. Cleary, C. Good, L.B. Crowder, and K.D. Hyrenbach. 2009. OBIS-SEAMAP: The world data center for marine mammal, sea bird, and sea turtle distributions. Oceanography 22(2):104-115
NOAA Southeast Fisheries Science Center. 1996. Report of a Cetacean Survey of Oceanic and Selected Continental Shelf Waters of the Northern Gulf of Mexico aboard NOAA Ship Oregon II (Cruise 220)
if (require("ggplot2", quietly = TRUE)) {
data(mexdolphin_sf, package = "inlabru")
ggplot() +
gg(mexdolphin_sf$mesh) +
gg(mexdolphin_sf$ppoly, color = "blue", alpha = 0, linewidth = 1) +
gg(mexdolphin_sf$samplers) +
gg(mexdolphin_sf$points, aes(size = size), color = "red") +
scale_size_area()
ggplot() +
gg(mexdolphin_sf$mesh, color = mexdolphin_sf$lambda, mask = mexdolphin_sf$ppoly)
}
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