Eden: An elevation map of Maunga Whau (Mt Eden).

In dereksonderegger/dsData: Datasets for Teaching

Description

Maunga Whau (Mt Eden) one of about 50 volcanos in the Auckland volcanic field. This dataset takes the volcano dataset and adds a primary sampling unit (PSU) and secondary sampling unit (SSU) onto the data so that it is suitable for cluster sampling examples.

Usage

Eden

Format

A data frame with 4800 rows and 5 variables:

x

the x coordinate

y

the y coordinate

elevation

the elevation (in meters)

PSU

the primary sampling unit associated with an observation

SSU

the secondary sampling unit associated with an observation. These are 1-25 and nested within PSU

Examples

library(ggplot2)
library(dplyr)

# Plot the elevation
ggplot(Eden, aes(x=x, y=y, fill=elevation)) + 
     geom_tile()   
     
# Plot the PSUs
PSU_labels <- Eden %>% group_by(PSU) %>% summarize(x=mean(x), y=mean(y), label=mean(PSU))
ggplot(Eden, aes(x=x, y=y, fill=(PSU-1) %/% 16)) + 
    geom_tile() +
    geom_text( data=PSU_labels, aes(label=label))
    
# PSUs modulus 4 and 16 are geographically contiguous
Eden.PSU <- Eden %>% group_by(PSU) %>% 
  summarize(x=mean(x), y=mean(y))  
ggplot(Eden, aes(x=x, y=y, fill=(PSU-1)%/%16)) +
  geom_tile() +
  geom_path(data=Eden.PSU)     

dereksonderegger/dsData documentation built on Nov. 22, 2020, 5:15 p.m.