removing boxes with a low amount of data points?

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Michael 2014-10-8

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回答： Image Analyst 2014-10-10

Hello,

I have scattered data points on a 3127 x 254 grid. I would like to interpolate this onto a regular grid (which I have done with triscatteredInterp) but now I would like to find and remove grid boxes that contained less than 30 data points when interpolation took place.

Does anyone know how I could do this?

thanks, Michael

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Image Analyst 2014-10-10

Note: requires Mapping Toolbox - wish I'd know that before I wasted my time. I added it to the products list below so others don't waste theirs.

Michael 2014-10-10

Sorry Image Analyst, I was unaware myself that I was using the mapping toolbox.

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Image Analyst 2014-10-10

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Since I can't try your code, all I can suggest is to do a convolution on your array, if you can get your array that is basically a "map" with counts as the values:

window = ones(7);  % Look everywhere in a sliding 7 by 7 window
% Count in each window
sumInWindows = conv(theCountArray, window, 'same');
% Find where count is below, say, 30
binaryImage = sumInWindows  < 30;
image(binaryImage);