[英]How to create a geometry column for a sf object in R
我的數據看起來像:
example <- tibble(geometry = "POINT (-3.8258 43.4109)")
我想將示例從 tibble 轉換為 sf object 我有以下解決方案,但我想知道是否有更簡單的方法(因為我也會有多邊形和線條)
left.border <- "POINT ("
right.border <- ")"
example %>%
mutate(coord =str_match(geometry, paste(left.border, '(.+)', right.border, sep=''))[,2]) %>%
separate( coord, c("X","Y"), sep = " ") %>%
mutate(X = str_sub(X, 2)) %>%
mutate(Y = str_sub(Y,1,nchar(Y)-2)) %>%
mutate(X= as.numeric(X),Y= as.numeric(Y) ) %>%
sf::st_as_sf(coords = c("X","Y"))
如果您所有的幾何圖形都是眾所周知的文本格式,您可以使用:
example = sf::st_as_sf(example, wkt = "geometry")
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