有没有办法在 R 中有更好的缓冲区边界？

Question

我希望有人可以帮助我解决以下情况。我正在做一个项目，我需要在 R 中围绕质心绘制一个圆（半径）。我还使用这个质心与其他几何图形相交。我面临的问题是缓冲区边界不是一个定义明确的圆，当我绘制圆和交点时看起来不太好。

我的代码看起来有点像这样：

使用 sf 和 ggplot2

方圆100公里 circle = st_buffer(centroid,100000) 对于路口

intersection = st_intersection(geometry,circle)

剧情

ggplot()+geom_sf(data= circle, fill = "yellow")

The border of buffer is "low quality"

Answer 1

还不错！也就是说，如果你真的想平滑 circle/buffer 边界，你可以使用包 smoothr.

这是一种可能性：

library(smoothr)

# Smooth circle border
circle_smooth <- smooth(densify(circle, max_distance = 10), method = "ksmooth")

# Plot
ggplot2::ggplot()+
  ggplot2::geom_sf(data= circle_smooth, fill = "yellow")

Answer 2

您也可以使用sf::st_buffer(..., nQuadSegs=)

来自https://geocompr.robinlovelace.net/geometric-operations.html

The third and final argument of st_buffer() is nQuadSegs, which means ‘number of segments per quadrant’ and is set by default to 30 (meaning circles created by buffers are composed of 4×30=120 lines). This argument rarely needs to be set. Unusual cases where it may be useful include when the memory consumed by the output of a buffer operation is a major concern (in which case it should be reduced) or when very high precision is needed (in which case it should be increased).

有没有办法在 R 中有更好的缓冲区边界？

Is there a way to have better buffer borders in R?

r

ggplot2

spatial

sf