# sphere_grid: Latitude-Longitude Grids In SphericalK: Spherical K-Function

## Description

Generates widely used Latitude-longitude grids for structuring global-scale data. A 10 * 10 equal-area grid is created in the example for future point-pattern analysis.

## Usage

 `1` ```sphere_grid(degr) ```

## Arguments

 `degr` A number that is applied to create a degr * degr grid, where 2.5 * 2.5 or 5 * 5 or 10 * 10 grids are commonly used.

## Value

latitudes Latitudes of degr * degr grid points

longitudes Longitudes of degr * degr grid points

`sphere_montekhat, sphere_khat`

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18``` ```#Spherical K function (minus CSR) with 90% confidence intervals #for point patterns associated with 25 * 25 latitude-longitude grid spheregrid<-sphere_grid(25) latm<-as.vector(spheregrid\$latitudes) lonm<-as.vector(spheregrid\$longitudes) d<-seq(from=0,to=pi,by=0.3) nd<-length(d) d[nd]<-pi khatsg<-sphere_khat(latm,lonm,d) Kcisg<-sphere_montekhat(98,50,d) plot(d,khatsg,type='n', ylim=c(-0.4,0.4),xlim=c(0,pi),xaxt = "n", ylab = expression(K - CSR),xlab = expression("Spherical Angle")) axis(1, at = c(0,pi/6, pi/3, pi/2, 2*pi/3, 5*pi/6, pi), labels = expression(0,pi/6, pi/3, pi/2, 2*pi/3, 5*pi/6, pi)) polygon(c(d, rev(d)), c(Kcisg[3,], rev(Kcisg[47,])),col = "grey79", border = FALSE) lines(d,khatsg,col = 4, lwd=2) lines(y=c(0,0),x=c(0,pi),type='l',lty=2,lwd=2) ```

### Example output ```
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SphericalK documentation built on May 2, 2019, 1:30 p.m.