Antarctic coastline

Antartica features and coastline, with somewhat spurious precision.

cst10

Format

An object of class SpatialPolygonsDataFrame with 372 rows and 2 columns.

Details

In sp format. Interesting for exploring precision issues with DEL0() see issue 7.

Examples

# \donttest{
p <- PATH0(cst10)
# DEL0(p)  ## fails as does DEL0(cst10)
# fails at 14 and crashes R in DEL0() in R version 4.0.0 RC (2020-04-17 r78247) on
# windows
p$vertex$x_ <- signif(p$vertex$x_, 13)
p$vertex$y_ <- signif(p$vertex$y_, 13)
DEL0(p)
#> class       : DEL0
#> type        : Primitive
#> vertices    : 14993 (2-space)
#> primitives  : 22267 (2-space)
#> crs         : +proj=stere +lat_0=-90 +lat_ts=-71 +lon_0=0 +k=1 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0

## compare 14993 unique vertices after rounding to
silicate::sc_vertex(p)     ## 21875
#> # A tibble: 21,875 x 2
#>           x_       y_
#>        <dbl>    <dbl>
#>  1 -2661902. 1488199.
#>  2 -2659465. 1460762.
#>  3 -2659332. 1487117.
#>  4 -2659076. 1464646.
#>  5 -2658998. 1393770.
#>  6 -2658790. 1383527.
#>  7 -2658556. 1483617.
#>  8 -2657841. 1487691.
#>  9 -2657524. 1394738.
#> 10 -2655128. 1490701.
#> # ... with 21,865 more rows

silicate::sc_vertex(cst10) ## 21875
#> # A tibble: 21,875 x 2
#>           x_       y_
#>        <dbl>    <dbl>
#>  1 -2661902. 1488199.
#>  2 -2659465. 1460762.
#>  3 -2659332. 1487117.
#>  4 -2659076. 1464646.
#>  5 -2658998. 1393770.
#>  6 -2658790. 1383527.
#>  7 -2658556. 1483617.
#>  8 -2657841. 1487691.
#>  9 -2657524. 1394738.
#> 10 -2655128. 1490701.
#> # ... with 21,865 more rows
# }