Description Usage Arguments Details Value Examples

View source: R/simplify_shape.R

Simplify a shape consisting of polygons or lines. This can be useful for shapes that are too detailed for visualization, especially along natural borders such as coastlines and rivers. The number of coordinates is reduced.

1 2 | ```
simplify_shape(shp, fact = 0.1, keep.units = FALSE, keep.subunits = FALSE,
...)
``` |

`shp` |
a |

`fact` |
simplification factor, number between 0 and 1 (default is 0.1) |

`keep.units` |
d |

`keep.subunits` |
d |

`...` |
other arguments passed on to the underlying function |

This function is a wrapper of `ms_simplify`

. In addition, the data is preserved. Also `sf`

objects are supported.

`sf`

object

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ```
## Not run:
if (require(tmap)) {
data(World)
# show different simplification factors
tm1 <- qtm(World %>% simplify_shape(fact = 0.05), title="Simplify 0.05")
tm2 <- qtm(World %>% simplify_shape(fact = 0.1), title="Simplify 0.1")
tm3 <- qtm(World %>% simplify_shape(fact = 0.2), title="Simplify 0.2")
tm4 <- qtm(World %>% simplify_shape(fact = 0.5), title="Simplify 0.5")
tmap_arrange(tm1, tm2, tm3, tm4)
# show different options for keeping smaller (sub)units
tm5 <- qtm(World %>% simplify_shape(keep.units = TRUE, keep.subunits = TRUE),
title="Keep units and subunits")
tm6 <- qtm(World %>% simplify_shape(keep.units = TRUE, keep.subunits = FALSE),
title="Keep units, ignore small subunits")
tm7 <- qtm(World %>% simplify_shape(keep.units = FALSE),
title="Ignore small units and subunits")
tmap_arrange(tm5, tm6, tm7)
}
## End(Not run)
``` |

tmaptools documentation built on Aug. 9, 2018, 9:04 a.m.

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