R:RasterToPolygon工作缓慢，然后停止工作 [英] R: RasterToPolygon works slow, then stop working

问题描述

即使我以前已经完成过处理R中的栅格的问题，我也遇到了问题.我可以读取数据并绘制它们:

I have a problem to process rasters in R, even if I've done it previously. I can read the data and plot them:

但是，当我尝试将栅格转换为多边形时，R停止工作

however, when I tried to convert my raster to polygon, the R stops working

我尝试更新软件包，在Windows 7的OSX上重新安装R，总是得到相同的结果.

I've tried to update packages, re-install R, on OSX, on Windows 7, always with the same result.

此外，我尝试将投影设置为NA，但这都没有帮助.您是否遇到过这样的问题?您对解决问题有什么建议吗?我非常感谢任何建议！

Moreover, I've tried to set my projection to NA, but this neither helped. Did you ever experienced problem like this? Do you have some suggestions how to solve the problem? I highly appreciate any suggestions !

我的数据在这里: https://ulozto.sk/x4pHuyra/data-堆叠zip

还有我的代码:

library(sp)
library(raster)
library(rgeos)
library(spatstat)
library(rgdal)     
library(maptools)
require(spdep)


# read final GFW raster - in JTSK

gfw_13<-raster("H:/.../gfw_ext_forest_03.tif")

projection(gfw_13)<-NA

# read shp
manag<-readOGR(dsn = "H:/...",
                layer = "cleared_management_by_NP")
projection(manag)<-NA

# convert raster GFW to shp       # !!!!! here it stops to work
pol.gfw<-rasterToPolygons(gfw_13, dissolve = T)

推荐答案

这不能解决速度问题，但是至少我的进程运行并且R不会崩溃...我需要为 rasterToPolygon 函数:

This doesn't solve the speed problem, but at least my processes run and R doesn't crashes... I need to define all arguments for rasterToPolygon function:

pol.gfw <- rasterToPolygons(gfw_13, fun=NULL, n=4, na.rm=TRUE, digits=12, dissolve=TRUE) 

也许是由于原始栅格中大量的NA值所致.

Maybe the problem was due to abundant numbers of NA values in the original raster..

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