[R-sig-Geo] Manipulate extract output

[jm3389]

Dear All,

I have been struggling to extract individual pixel values from within a set
of polygons.

Mbola.shp <- readOGR(dsn="C:/Users/JOX201S/Desktop/Dropbox/LDSF/Mbola",
"MBSubplot1LULC")
SMA <- raster("C:/Users/JOX201S/Desktop/Dropbox/LDSF/Mbola/SMA-clipped.img")

X <- extract(SMA, Mbola.shp)

then when I display X I obtain a list:

>X
[[1]]
 [1] 0.08505697 0.11521957 0.07027940 0.07027940 0.10559745 0.10363697
0.09353689
 [8] 0.09353689 0.09673717 0.12536806 0.15696177 0.09306118 0.09353689
0.09673717
[15] 0.09306118 0.09306118 0.09669495

[[2]]
 [1]  0.02609529  0.02609529  0.02996226 -0.00057072  0.02159369  0.02159369
 [7]  0.04489277  0.02804214  0.02835380  0.06462935  0.06462935  0.02266412
[13]  0.03684234  0.02083779  0.07917891  0.05502048  0.03577228

[[3]]
 [1] 0.08705948 0.08705948 0.08622552 0.05902963 0.05902963 0.03294581
0.08919024
 [8] 0.10308155 0.10308155 0.04357137 0.06129387 0.18882106 0.15271443
0.15271443
[15] 0.07749587 0.23532785 0.23532785

[[4]]
 [1] 0.09554891 0.09314694 0.13511878 0.12017184 0.12056647 0.10497463
0.19552167
 [8] 0.19496135 0.10160323 0.09736327 0.12032449 0.18401594 0.13698930
0.09173016
[15] 0.11627619 0.13992140

[[5]]
 [1] 0.08130399 0.12848020 0.15129283 0.06018241 0.06018241 0.12764616
0.15831620
 [8] 0.16025396 0.07245398 0.07245398 0.08861573 0.15831620 0.16025396
0.07245398
[15] 0.08861573 0.10879661

[[6]]
 [1] 0.01403566 0.05509807 0.06573696 0.07086041 0.05806389 0.08060271
0.04586258
 [8] 0.04270630 0.07691538 0.06859619 0.08897498 0.06756449 0.04492125
0.04651234
[15] 0.04652581 0.08224432 0.04266668 0.05377325

[[7]]
 [1] 0.19860968 0.13489768 0.11530623 0.11530623 0.12832202 0.18902805
0.09427368
 [8] 0.08301217 0.08301217 0.11991798 0.18725793 0.19014162 0.14259814
0.14259814
[15] 0.08376002 0.18725793 0.14259814 0.14259814 0.08376002

[[8]]
 [1]  0.06091007  0.06091007  0.05323072  0.03962127  0.04709431  0.04709431
 [7]  0.05578892  0.06078413  0.03223819  0.02318165  0.02318165  0.04193906
[13]  0.04568461 -0.01365644  0.01866432  0.01866432  0.04833658  0.04675072
[19]  0.04113418  0.04113418  0.03635887


I would like to reshape the list like that:

Pixel value  | Polygon
0.08505697     [[1]]
0.11521957     [[1]]
0.07027940     [[1]]
0.07027940     [[1]]
0.10559745     [[1]]
...

I have tried stack, and the reshape package but haven't been able to
manipulate the list.
I am sure it's a very simple function but I've been searching the web for
days now and nothing really works.

Any suggestion?
Thanks
Joseph


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