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Blocking Information of Japanese Coast Lines and Prefecture Boundaries

Arguments

start indices for jpn.x or jpn.y giving where each block starts.
end indices for jpn.x and jpn.y giving where each block ends.
x 2 by 85 matrix. Each column gives minimum and maximum longitudes of each block.
y 2 by 85 matrix. Each row gives minimum and maximum latitudes of each block.

Description

Datasets giving blocking information for jpn.x and jpn.y, used by jpn().