I have a series of scanned global maps (from a bound Atlas) of oceanographic
sampling effort that I would like to classify. On 1 x1 lat/lon grids are
symbols that represent sampling density.  I need to read in these scanned
maps, and classify the symbols (squares are classified as 1, triangles as 2,
etc.) and hopefully store them in raster grid files (.asc) for analysis.

After some trawling through CRAN looking for packages for this, it is not
yet apparent to me which is best.  I've considered using a GIS for this (ie.
GRASS), but I'm not sure if that is a more complicated solution to a simpler
problem.  I need to process a directory of these images, so scripting the
process to loop over the directory would be ideal.

Suggestions?

Many thanks,

Tim

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