Convert a dataset of points into a sparse matrix, for faster downstream computations
id
character ID of point
country
character Country of point, if available
valid
logical Is point valid or redundant?
mat
Matrix Sparse matrix with 100 m resolution at the equator
nlat
Number of latitude cells that go from 90N to 90S
nlon
Number of longitude cells that go from 180W to 180E
idx
numeric Total number of valid IDs
delta
numeric Meridional spatial resolution, in degrees
verbose
Output progress to console
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