drop layer/band from SpatialGridDataFrame

Andy - how about these two options

monthly.sp at data <- monthly.sp at data[-1,]

or (cheating with the help of raster package)

monthly.stack <- as(monthly.sp, 'RasterStack')
monthly.stack <- dropLayer(monthly.stack, 1)
monthly.sp <- as(monthly.stack, 'SpatialGridDataFrame')

Apologies if these are nonsense - I don't have time to actually test 
these out on a toy example at the moment.

Matt

I was a bit hasty. The SpatialGridDataFrame contains 325 separate grids each with 155 cols and 52 rows. E.g., if it were an array I'd think it would have dimensions of 52, 155, 325 and I'd want to do something like: monthly.sp[,,-1]. When I'm done I want the object to have 324 variables with 8060 obs and keep the cells.dim at 155 by 52.

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Matthew Landis, Ph.D.
Research Scientist
ISciences, LLC
61 Main St. Suite 200
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