venus: Venus craters

In sphunif: Uniformity Tests on the Circle, Sphere, and Hypersphere

Venus craters

Description

Craters on Venus from the USGS Astrogeology Science Center.

Usage

venus

Format

A data frame with 967 rows and 4 variables:

name

name of the crater (if named).

diameter

diameter of the crater (in km).

theta

longitude angle \theta \in [0, 2\pi) of the crater center.

phi

latitude angle \phi \in [-\pi/2, \pi/2] of the crater center.

Details

The (\theta, \phi) angles are such their associated planetocentric coordinates are:

(\cos(\phi) \cos(\theta), \cos(\phi) \sin(\theta), \sin(\phi))',

with (0, 0, 1)' denoting the north pole.

The script performing the data preprocessing is available at venus.R.

Source

https://astrogeology.usgs.gov/search/map/Venus/venuscraters

Examples

# Load data
data("venus")

# Add Cartesian coordinates
venus$X <- cbind(cos(venus$theta) * cos(venus$phi),
                 sin(venus$theta) * cos(venus$phi),
                 sin(venus$phi))

# Tests
unif_test(data = venus$X, type = c("PCvM", "PAD", "PRt"), p_value = "asymp")

sphunif documentation built on May 29, 2024, 4:19 a.m.