问题
I'm doing some spatial stuff in R and out of the blue some of my code will no longer work on a computer that I've been using for years, specifically because it's "running out of memory."
## Raster going in
xx <- raster(fatNames[[i]])
xx
class : RasterLayer
dimensions : 5160, 14436, 74489760 (nrow, ncol, ncell)
resolution : 0.008333333, 0.008333333 (x, y)
extent : -172.3, -52, 23.5, 66.5 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0
data source : D:\Dropbox\wintor_aux\Results\myluFatReq_100_2_fat.inf.tif
names : myluFatReq_100_2_fat.inf
values : 0.1831425, 3.449095 (min, max)
## transform
x.rast <- projectRaster(xx,crs = CRS("+init=epsg:2955"))
Error: can not adequate vector of 4.2Gb.
Now I know this is a decent sized raster (Input raster size: 75.5 MB) however the machine has 32Gb of RAM, no other programs are running and I still swamp the memory. I've done things like this hundreds of times over the years and to the best of my knowledge nothing on the machine has changed since I did this last about a month ago.
I've tried restarting the session, restarting the computer and have googled around a bit but I still haven't had any luck in trying to trace down the issues. When I try the same code block on a machine with 1/2 the RAM I'm able to run it no problem (using ~ 8Gb ram max). Does anyone have any suggestions as to how I can chase this down?
> sessionInfo()
R version 3.5.1 (2018-07-02)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)
Matrix products: default
locale:
[1] LC_COLLATE=English_New Zealand.1252 LC_CTYPE=English_New Zealand.1252
[3] LC_MONETARY=English_New Zealand.1252 LC_NUMERIC=C
[5] LC_TIME=English_New Zealand.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] raster_2.6-7 rgdal_1.3-3 sp_1.3-1 sf_0.6-3
[5] RevoUtils_11.0.1 RevoUtilsMath_11.0.0
loaded via a namespace (and not attached):
[1] Rcpp_0.12.18 lattice_0.20-35 class_7.3-14 grid_3.5.1 spData_0.2.9.0
[6] DBI_1.0.0 magrittr_1.5 e1071_1.7-0 units_0.6-0 tools_3.5.1
[11] yaml_2.2.0 compiler_3.5.1 classInt_0.2-3
回答1:
You should first update the raster package to its current (CRAN) version. That might fix this. If not, this is probably a corner-case that you should be able to work-around by setting the memory parameters to a lower value. In the current version you could do rasterOptions(memfrac=.3). In the current and older versions you may try rasterOptions(maxmemory=1e+08)
By the way, your transformation to +proj=utm +zone=11 (please do not use espg codes in examples) seems rather questionable given that the input data has a longitude span of (172.3 - 52) = 120 degrees --- UTM is valid for a span of about 6 degrees.
来源：https://stackoverflow.com/questions/59493477/projectraster-consuming-too-much-memory