get_seafloor: Get seafloor features at a spatial point

In ericmkeen/shipstrike: Utilities for spatially- and temporally-explicit predictions of whale-ship collisions

Get seafloor features at a spatial point

Description

Get seafloor features at a spatial point

Usage

get_seafloor(lon, lat, seafloor, lat_range = 0.009009)

Arguments

lon	The longitude (decimal degrees; West coordinates are negative) of interest. This can be a single value or a vector of values.
lat	The latitude (decimal degrees; South coordinates are negative). This must be the same length as lon.
seafloor	A data.frame with seafloor depths; required columns are x (longitude, decimal degrees), y (latitude), and layer (with the seafloor depth).
lat_range	The range around the provided coordinate, expressed as a numeric representing degrees latitude, used to summarize seafloor features. The default represents 1 km north-south.

Value

A dataframe, with the number of rows equal to the length of lon, with the following columns:

• z Seafloor depth nearest to the coordinate.

• zmin Minimum seafloor depth within lat_range of the coordinate.

• zmax Maximum seafloor depth.

• zsd Standard deviation of seafloor depth within lat_range.

ericmkeen/shipstrike documentation built on May 21, 2023, 7:05 a.m.