geom_hurricane: Hurricane

In fmax85/hurricane: Storm observations geom

Description

geom_hurricane is a special implementation of geom_polygon. It is developed to draw the regions of a storm observation corresponding to the same wind speed level, for the four quadrants defined by an origin point. The contour of the "iso-speed" levels are connected by a 'polygon' grid object.

Usage

geom_hurricane(mapping = NULL, data = NULL, position = "identity",
  na.rm = FALSE, show.legend = NA, inherit.aes = TRUE, ...)

Arguments

mapping	Set of aesthetic mappings created by aes or aes_. If specified and inherit.aes = TRUE (the default), it is combined with the default mapping at the top level of the plot. You must supply mapping if there is no plot mapping.
data	The data to be displayed in this layer. There are three options: If NULL, the default, the data is inherited from the plot data as specified in the call to ggplot. A data.frame, or other object, will override the plot data. All objects will be fortified to produce a data frame. See fortify for which variables will be created. A function will be called with a single argument, the plot data. The return value must be a data.frame., and will be used as the layer data.
position	Position adjustment, either as a string, or the result of a call to a position adjustment function.
na.rm	If FALSE, the default, missing values are removed with a warning. If TRUE, missing values are silently removed.
show.legend	logical. Should this layer be included in the legends? NA, the default, includes if any aesthetics are mapped. FALSE never includes, and TRUE always includes.
inherit.aes	If FALSE, overrides the default aesthetics, rather than combining with them. This is most useful for helper functions that define both data and aesthetics and shouldn't inherit behaviour from the default plot specification, e.g. borders.
...	other arguments passed on to layer. These are often aesthetics, used to set an aesthetic to a fixed value, like color = "red" or size = 3. They may also be parameters to the paired geom/stat.

Aestethics

geom_hurricane understands the following aesthetics (required in bold):

• x: longitude

• y: latitude

• r_ne: wind radius for the NE quadrant, in nautical miles

• r_se: wind radius for the SE quadrant, in nautical miles

• r_nw: wind radius for the SW quadrant, in nautical miles

• r_sw: wind radius for the NW quadrant, in nautical miles

• colour: (see geom_polygon)

• fill: (see geom_polygon)

• size: (see geom_polygon)

• linetype: (see geom_polygon)

• alpha: (see geom_polygon)

• scale_radii: scaling factor of the wind radius dimensions

See Also

geom_polygon for generic polygon

Examples

# When using `geom_hurricane`, you will typically need a storm
# observation data frame, with specific columns. You can find a
# test dataset along with this package named `ike`. Consider
# the following code as a test example:

## Not run: 
library(ggplot2)

ike_1 <- ike %>% dplyr::filter(latitude > 29 & latitude < 30)
map_plot <- ggmap::get_map("Lousiana", zoom = 6, maptype = "toner-background", source = "stamen")
map <- map_plot %>% ggmap::ggmap(extent = "device") +
    geom_hurricane(data = ike_1, mapping = aes(x = longitude, y = latitude, r_ne = ne, r_se = se, r_sw = sw,
                                               r_nw = nw, fill = wind_speed, colour = wind_speed, scale_radii = 0.4)) +
    scale_color_manual(name = "Wind speed (kts)", values = c("red", "orange", "yellow")) +
    scale_fill_manual(name = "Wind speed (kts)", values = c("red", "orange", "yellow"))

## End(Not run)

fmax85/hurricane documentation built on May 28, 2019, 2:31 a.m.