英文:
st_buffer with geometry sfc_POINT
问题
我正在处理地理空间数据，对于分析的一部分，我需要使用从Excel获取的地区坐标点，并使用st_as_sf将这些数据转换为sf对象。当我尝试在这些点周围设置缓冲区时，我可以使用st_buffer(data_as_sf, 2000)来设置2公里的缓冲区。这在我有几何对象为sfc_MULTIPOLYGON的形状文件中运行良好。但现在我的几何对象是sfc_POINT。在这种情况下，我需要如何设置缓冲区？使用常规的st_buffer方法会起作用吗，还是我需要将其转换为sfc_MULTIPOLYGON？
英文:
I'm working with geospatial data and for one part of the analysis I need to use coordinate points of regions that I get from an excel and turn that data into sf object using st_as_sf. When I tried to set a buffer around the points I use st_buffer(data_as_sf, 2000) for a 2km buffer. This was working well with shapefiles where I had the geometry object as sfc_MULTIPOLYGON. But now my geometry object is sfc_POINT. How do I need to set the buffer in this case? Would it work well using regular st_buffer method or do I need to convert it into sfc_MULTIPOLYGON?
答案1
得分: 1
为什么不简单地测试一下？
library(sf)
my_point <- st_sfc(st_point(c(0, 0)))
my_buffer <- st_buffer(my_point, 2000)
class(my_point)
#> [1] "sfc_POINT" "sfc"
class(my_buffer)
#> [1] "sfc_POLYGON" "sfc"
plot(my_buffer, axes = TRUE)
plot(my_point, add = TRUE)
我们可以看到st_buffer正确地创建了一个2,000米的sfc_POLYGON围绕我们的sfc_POINT。
创建于2023年02月23日，使用reprex v2.0.2
英文:
Why not simply test it out?
library(sf)
my_point <- st_sfc(st_point(c(0, 0)))
my_buffer <- st_buffer(my_point, 2000)
class(my_point)
#> [1] "sfc_POINT" "sfc"
class(my_buffer)
#> [1] "sfc_POLYGON" "sfc"
plot(my_buffer, axes = TRUE)
plot(my_point, add = TRUE)
We can see that st_buffer has correctly created a 2,000m sfc_POLYGON around our sfc_POINT
<sup>Created on 2023-02-23 with reprex v2.0.2</sup>
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