points to grid

I have 11,000 random data points of vegetation with a latitude and
longitude for each point.
I want to create a global 2D lat/lon grid (0.5x0.5 degree) with this
data, using interpolation. Data over the ocean
should either be all 0's or missing, either way. Which approach /
function is best for this?

veg(11000)
lat(11000)
lon(11000)

TO

data(360,720)
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Received on Wed Dec 03 2008 - 12:18:09 MST