Using linspace outside of field data areas?

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Harald von der Osten 2021-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/887544-using-linspace-outside-of-field-data-areas

编辑： Walter Roberson 2021-8-2

I have data like this one (data: irregular in xyz, no data in the white area):

and would like to resample it using linspace. How can I force linspace to do this within the data range and set outside values to NaN? Otherwise the result will be like this one:

Thanks a lot for each hint,

Harald

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Answer 1

Walter Roberson 2021-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/887544-using-linspace-outside-of-field-data-areas#answer_755489

Use scatteredInterpolant() with the Extrapolation Method set to 'none'

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Walter Roberson 2021-8-1

Could you confirm that the data you use to plot the above is scattered?

And is it correct that you want to interpolate only within "connected" regions? So the "islands" should be done separately, and the "holes" are not to be filled? And the area that looks like it might be a wafer, the white gap should not be filled?

What about the small white areas around the black dots?

Harald von der Osten 2021-8-2

编辑：Walter Roberson 2021-8-2

yes, I can confirm that the data used are scattered. Here is a small sample:

583672.2,5417531.46,0,3.158504376141652,2,0,0,0.1
583672.6800000001,5417531.32,0,5.40855022159389,2,0,1,0.1
583673.16,5417531.19,0,5.839143662601507,2,0,2,0.1
583673.64,5417531.05,0,4.55544778040343,2,0,3,0.1
583674.13,5417530.92,0,6.341357944431953,2,0,4,0.1
583674.61,5417530.79,0,5.714415007217156,2,0,5,0.1
583675.09,5417530.65,0,3.359512393820803,2,0,6,0.1
583675.5699999999,5417530.52,0,2.854370950622065,2,0,7,0.1
583676.05,5417530.38,0,0.8373368253752029,2,0,8,0.1
583676.53,5417530.25,0,0.4138810632575255,2,0,9,0.1
583672.23,5417531.55,0,2.911780594093502,2,0,0,0.2
583672.71,5417531.42,0,4.778725366540664,2,0,1,0.2
583673.1899999999,5417531.29,0,5.314470696520858,2,0,2,0.2
583673.67,5417531.15,0,5.562580691332191,2,0,3,0.2
583674.15,5417531.02,0,6.09445558454945,2,0,4,0.2
583674.63,5417530.88,0,5.189610485588558,2,0,5,0.2
583675.12,5417530.75,0,3.382544976731074,2,0,6,0.2
583675.6,5417530.61,0,2.725916915564379,2,0,7,0.2
583676.08,5417530.48,0,1.22253892156351,2,0,8,0.2
583676.5600000001,5417530.34,0,0.598961386329446,2,0,9,0.2
583672.25,5417531.65,0,3.125056812045332,0,0,0,0.3
583672.73,5417531.52,0,4.950900511487444,0,0,1,0.3
583673.22,5417531.38,0,5.317797730440216,0,0,2,0.3
583673.7,5417531.25,0,6.680713602260954,0,0,3,0.3
583674.1800000001,5417531.11,0,6.068553224666836,0,0,4,0.3
583674.66,5417530.98,0,4.333805963959941,0,0,5,0.3

Yes, I want to interpolate only within connected regions, the white regions should be ignored, white gaps should not be filled. The small white areas around black dots are important (part of the geomagnetic anomalies) and should be not ignored.

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