Large .img file processing in R (GIS) -


i working u.s. national landcover dataset (nlcd) classify habitat type @ more 150 sites across northeast u.s. dataset large (15gb) cannot upload here, comes in .img format @ 30m resolution. have gps coordinates center point of sites. able extract proportion of landcover classes in 1 square kilometer around point. questions are:

1) how upload .img files r? 2) how extract information around gps coordinates proportions of different habitat classes?

has worked dataset in r before? if use help. cheers, israel

use raster package can process files disk, reading in chunks @ time.

the raster package has extract function buffer argument. set buffer appropriate value (1000 if map units metres , want km radius)


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