Hello All,

Thanks in advance.

I have many ascii raster files with values representing resistance to animal
movement.  I would like to merge these files into one with the cells
representing the mean cell value from all of the files but I have not found
an easy way to do this.  Hopefully I haven't missed something easy.

Example:

grid1

ncols         10
nrows         10
xllcorner     1.0
yllcorner     1.0
cellsize      1.0
NODATA_value  -9999
0.000357 0.001027 0.000805 0.000000 0.081807 0.187900 0.104016 0.022658
0.009466 0.001935
0.003548 0.127713 0.209348 0.000000 0.223908 0.038593 0.130113 0.153949
0.077215 0.006899
0.011093 1.000000 0.431280 0.408257 0.000000 0.000000 0.110307 0.025862
0.137367 0.062129
0.034994 0.216908 0.353100 0.272441 0.377437 0.302346 0.000000 0.096949
0.103691 0.109096
0.082386 0.106230 0.143232 0.082990 0.000000 0.108077 0.303234 0.000000
0.028730 0.177887
0.038909 0.214878 0.070393 0.065658 0.069213 0.062199 0.320038 0.033622
0.000000 0.194666
0.019571 0.207906 0.072075 0.063715 0.048383 0.289683 1.000000 0.016230
0.203176 0.000000
0.024110 0.181760 0.038990 0.140245 0.184284 0.213371 0.181881 0.208175
0.040404 0.010333
0.000000 0.087435 0.181934 0.139346 0.140992 0.081971 0.005192 0.003207
0.001927 0.000927
0.000000 0.000000 0.016308 0.016914 0.012778 0.006049 0.002248 0.000651
0.000341 0.000197

grid2

ncols         10
nrows         10
xllcorner     1.0
yllcorner     1.0
cellsize      1.0
NODATA_value  -9999
0.000468 0.001199 0.000920 0.000000 0.121743 0.280769 0.161228 0.041467
0.018927 0.003883
0.003525 0.135052 0.228564 0.000000 0.332760 0.054795 0.181881 0.314980
0.159828 0.014272
0.008427 1.000000 0.437725 0.501494 0.000000 0.000000 0.234149 0.052453
0.384025 0.142958
0.024514 0.176738 0.346569 0.267034 0.399569 0.344980 0.000000 0.371773
1.000000 0.178494
0.056282 0.071736 0.096446 0.059201 0.000000 0.061408 0.233373 0.000000
0.036457 0.209228
0.026387 0.143127 0.045834 0.043704 0.041783 0.023811 0.053071 0.016786
0.000000 0.221727
0.013008 0.137858 0.047432 0.041280 0.029609 0.111149 0.105711 0.008439
0.222293 0.000000
0.015954 0.119895 0.025838 0.091063 0.117556 0.127833 0.130537 0.212232
0.044132 0.012076
0.000000 0.057663 0.119803 0.090802 0.091032 0.054078 0.005361 0.004239
0.003214 0.001584
0.000000 0.000000 0.010709 0.011090 0.008433 0.004449 0.002848 0.002021
0.001321 0.000456


grid1 <- readAsciiGrid("C:\\junk\\grid1.asc")
grid2 <- readAsciiGrid("C:\\junk\\grid2.asc")

After this no luck with the "mean" command

Thank you and sorry for a potentially easy newbie question.

G.

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