Elongation(vector data) — vm_p_elong • vectormetrics

Calculate elongation of shape

vm_p_elong(landscape, class_col = NULL, patch_col = NULL)

Arguments

landscape: the input landscape image,
class_col: the name of the class column of the input landscape
patch_col: the name of the id column of the input landscape

Value

the function returns tibble with the calculated values in column "value", this function returns also some important information such as level, class, patch id and metric name.

Details

ratio between major and minor axis length

References

Jiao, L., Liu, Y., & Li, H. (2012). Characterizing land-use classes in remote sensing imagery by shape metrics. ISPRS Journal of Photogrammetry and Remote Sensing, 72, 46–55. https://doi.org/10.1016/j.isprsjprs.2012.05.012

Examples

vm_p_elong(vector_patches, "class", "patch")
#> # A tibble: 40 × 5
#>    level class id    metric value
#>    <chr> <chr> <chr> <chr>  <dbl>
#>  1 patch 1     11    elong  0.511
#>  2 patch 1     12    elong  0.187
#>  3 patch 1     13    elong  0.384
#>  4 patch 1     14    elong  0.383
#>  5 patch 1     15    elong  0    
#>  6 patch 1     16    elong  0    
#>  7 patch 1     17    elong  0    
#>  8 patch 1     18    elong  0.335
#>  9 patch 1     19    elong  0    
#> 10 patch 1     20    elong  0    
#> # ℹ 30 more rows