如何创建空间点网格

看sf下面的版本!

你可以使用创建一个网格 sp::makegrid

library(sp)
library(rgdal)
library(raster)

# load some spatial data. Administrative Boundary
us <- getData('GADM', country = 'US', level = 1)
us$NAME_1
colorado <- us[us$NAME_1 == "Colorado",]


# check the CRS to know which map units are used
proj4string(colorado)
# "+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0"

# Create a grid of points within the bbox of the SpatialPolygonsDataFrame 
# colorado with decimal degrees as map units
grid <- makegrid(colorado, cellsize = 0.1) # cellsize in map units!

# grid is a data.frame. To change it to a spatial data set we have to
grid <- SpatialPoints(grid, proj4string = CRS(proj4string(colorado)))

plot(colorado)
plot(grid, pch = ".", add = T)

奥地利的另一个例子(GADM代码'AUT').

要仅提取多边形内的点,请使用`[`基于位置对点进行子集,如下所示:

grid <- grid[colorado, ]

library(sf)
library(raster)
library(ggplot2)

# load some spatial data. Administrative Boundary
aut <- getData('GADM', country = 'aut', level = 0)
aut <- st_as_sf(aut)
# ggplot() + 
  # geom_sf(data = aut)

grid <- aut %>% 
  st_make_grid(cellsize = 0.1, what = "centers") %>% # grid of points
  st_intersection(aut)                               # only within the polygon

# ggplot() + 
  # geom_sf(data = aut) + 
  # geom_sf(data = grid)