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Re: latitude, longitude and a data point [message #63616 is a reply to message #63422]

Wed, 12 November 2008 12:29

MarioIncandenza
Messages: 231
Registered: February 2005

Senior Member

Peter,

If your lat and lon arrays are already points on a 2d grid, David's
solution works. If they are points you wish to lay on an arbitrary
grid, it works like this:

h2=hist_nd(transpose([[longitude],[latitude]]),[bin_x,bin_y] ,min=
[-180,-90],max=[179.999999,89.99999],reverse_indices=ri2); grid
val2=h2*0.0d; initialize
for i=0l,n_elements(h2)-1 do if(h2[i] gt 0) then val2[i]
=MEAN_OR_WHATEVER(values[ri2[ri2[i]:(ri2[i+1]-1)]]); calculate

If that looks like black magic, go to David's website and search for
"horror disgust".

--Edward H.

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[Message index]

		latitude, longitude and a data point By: kramerpeterk on Tue, 11 November 2008 06:00
		Re: latitude, longitude and a data point By: MarioIncandenza on Wed, 12 November 2008 12:29

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