The standard deviation of Perimeter-Area ratio index of all patches at class level(vector data)

This function allows you to calculate the standard deviation of the ratios of all patches belonging to one class in a categorical landscape in vector data format

vm_c_perarea_sd(landscape, class_col)

Arguments

landscape

the input landscape image,

class_col

the name of the class column of the input landscape

Value

the returned calculated standard deviation of each class is in column "value", and this function returns also some important information such as level, class number and metric name. Moreover, the "id" column, although it is just NA here at class level. we need it because the output struture of metrics at class level should correspond to patch level one by one, and then it is more convinient to combine metric values at different levels and compare them.

Examples

vm_c_perarea_sd(vector_landscape, "class")
#> # A tibble: 3 × 5
#>   level class id    metric     value
#>   <chr> <chr> <chr> <chr>      <dbl>
#> 1 class 1     NA    perarea_sd    NA
#> 2 class 2     NA    perarea_sd    NA
#> 3 class 3     NA    perarea_sd    NA