On 10/29/2010 11:26 PM, Ryan Michael wrote:
I have a data set that I'm trying to interpolate, and in some cases
there are large swaths of area that are surrounded by points, but
don't contain any points. This produces a graph where these interior
regions have values determined by the nearest points.
Rather than assuming that these points are accurately represented by
the surrounding points, I would prefer to not render those grid
points, and only show grid boxes which are actually representative of
data. Is there a way to do this? I was thinking I could add second
field and assign opacity to that, but I can't figure out a way to get
the field to be 'true' if there are points enclosed and 'false'
otherwise (or to simply count the number of enclosed points.)
Any ideas?
Just a thought- You might create a buffer around all points at the max
distance you consider to be relevant for interpolation. The buffer will
thus cover only areas with a density of points of your choosing. The
"swaths" will be outside the buffer. Convert the buffer to a raster, and
make it a MASK. Now, after doing your point interpolation, use the mask
to set to null all the areas outside the buffer.
Thanks for any suggestions!
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Micha Silver
Arava Development Co. +972-52-3665918
http://www.surfaces.co.il
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