要保持原始范围的同时将SpatialPoints对象转置或镜像,可以使用sp和rgdal包中的函数来实现。下面是一个示例代码:
library(sp)
library(rgdal)
# 创建一个示例的SpatialPoints对象
coords <- matrix(c(1, 2, 3, 4, 5, 6), ncol = 2)
sp_points <- SpatialPoints(coords)
# 获取原始范围
orig_extent <- bbox(sp_points)
# 转置SpatialPoints对象
transposed_points <- t(sp_points@coords)
# 创建一个新的SpatialPoints对象
transposed_sp <- SpatialPoints(transposed_points, proj4string = CRS(proj4string(sp_points)))
# 设置新的范围为原始范围
bbox(transposed_sp) <- orig_extent
# 镜像SpatialPoints对象
mirrored_points <- transposed_sp@coords
mirrored_points[, 1] <- max(mirrored_points[, 1]) - mirrored_points[, 1]
# 创建一个新的SpatialPoints对象
mirrored_sp <- SpatialPoints(mirrored_points, proj4string = CRS(proj4string(sp_points)))
# 设置新的范围为原始范围
bbox(mirrored_sp) <- orig_extent
# 可视化结果
plot(sp_points, pch = 19, col = "blue", xlim = c(0, 7), ylim = c(0, 7))
points(transposed_sp, pch = 19, col = "red")
points(mirrored_sp, pch = 19, col = "green")
legend("topright", legend = c("Original", "Transposed", "Mirrored"), col = c("blue", "red", "green"), pch = 19)
运行上述代码将创建一个示例的SpatialPoints对象,然后将其转置和镜像创建新的SpatialPoints对象。最后,通过可视化结果,可以比较原始对象和转置/镜像对象之间的区别。
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