[GIS] Raster calculator: Insufficient memory available for operation

qgisraster

I use QGIS 2.14 (Windows, 64bit) and try to do some raster calculations with EUNIS habitat data, filter for specific habitat types, files are about 3 GB.

RAM: 8 GB (7,85 GB usable)
Virtual RAM: 8043 MB (automatic)

But there is always the following error: Raster calculator: Insufficient memory available for operation.

Any suggestions?

Best Answer

For large raster files you can use r.mapcalculator in QGIS Processing Toolbox.

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[GIS] Raster Calculator Error : Insufficient memory available for operation

Here's a solution in R based on the OP's comments:

#Load the three packages below 
 library(sp)
 library(raster)
 library(rgdal)

##Load Raster

r <- raster("path to raster")
fun <- function(x) { x * 10 } #function you want to use here, am multiplying   all cells by 10
rc <- calc(r, fun) #Performs a raster calculation 

##WriteRaster to a .tif

writeRaster(rc, "C:\\...\\newrast.tif", format="GTiff")

Note, you could write a loop, if you have multiple rasters to start with, or alternately explore the stack function in the raster package to stack them and run the calc function on that stack, and then write it out.

Example:

rast <- stack(r1,r2,r3,r4) #Note they have to be of the same extent and resolution

fun <- function(x){ x * 10}
rc_stack <- calc(rast, fun)

##Writing it out, by keeping old names

newname<-paste("C:\\Users\\",names(rast)) #Saves the previous names
writeRaster(rc_stack, newname, bylayer=T, format="GTiff")

[GIS] Error in raster Analysis in QGIS

Try to divide raster into parts and then use raster calculator - your DEM is very high detailed and huge, I mean

Best Answer

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[GIS] Raster Calculator Error : Insufficient memory available for operation

[GIS] Error in raster Analysis in QGIS

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