Data Reduction and sub set of data

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amberly hadden 2014-12-3

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编辑： Image Analyst 2014-12-9

Hello every body,

I'm new with Matlab. I want to write a code whcih can be used on my grid file to reduce it to region of my interest. I have lat lon and displacement values. I want to define a circle of radius 100Km from a central point(lat lon) so that everything outside the circle delete and I get a resultant grid file with data of my own interest.

I would like to pay some reward (as Im a student) for this work.

Please let me know if anybody is interested

Thanks

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采纳的回答

Image Analyst 2014-12-3

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https://ww2.mathworks.cn/matlabcentral/answers/165323-data-reduction-and-sub-set-of-data#answer_161182

Save some money and see the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

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Image Analyst 2014-12-9

在 MATLAB Online 中打开

Try this code:

numbers = xlsread('test.xls');
lats = numbers(:, 1);
lons = numbers(:, 2);
z = numbers(:, 3);
lat1 = 58.4
lon1 = 26.1
z1 = 1.65
lat2 = 58.5
lon2 = 27
z2 = 1.11
desiredLats = lats >= lat1 & lats <= lat2
desiredLons = lons > lon1 & lons <= lon2
desiredZs = z <= z1  & z >= z2
rowsToExtract = desiredLats & desiredLons & desiredZs
extractedRows = numbers(rowsToExtract, :)