Transform 2d array latitude into 1d array latitude

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MICHELE GNESOTTO 2022-5-1

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评论： M_D8993 2022-5-29

Hi, i have downlod the climate projection of sea surface temeperature obtained with the cmip6 model.

My problem is that i have a 2d array for latitude and longitude and my sst is a 3d array sst(tos, i , j) where

the combination of i,j corrisponds to a value for latitude and longitude, i would like to have sst as sst(tos, lon,lat) in order to have

easy way to plot it and confront it with other results. Do you have any advice .

What I want to do is something like : countourf( latitude(i,j) , longitude(i,j) , tos ).

it is not working becasue i and j are vectori and not single values i think.

Thanks

Mike

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Answer 1

Tevel Hedi 2022-5-1

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search "transpose" in matlab and use that command on your vectors.

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MICHELE GNESOTTO 2022-5-1

it's not working, i want to go from a matrix to vactors , transpose is not recucing the dimension though.

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Answer 2

Keegan Carvalho 2022-5-1

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编辑：Keegan Carvalho 2022-5-1

在 MATLAB Online 中打开

Is "tos" the SST variable? I don't see "sst" it in the figure.

If "tos" is the SST variable, then 256 x 220 x 1032 would correspond to lon x lat x time OR lat x lon x time; where "time" would be the SST values for the given "time" (eg. daily/monthly values)

If it is the first instance, then

newsst = permute(tos, [3 1 2]);
% This would make it time x lon x lat

If it the second instance, then

newsst2 = permute(tos, [3 2 1]);
% This would make it time x lat x lon

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MICHELE GNESOTTO 2022-5-1

yes tos is sst variable, sorry for bad explanation. My problem is that latitude is 256x220 and not something like 256x1, so for example when i try to plot with countourf and add the coaslines i have problem to match the graphics since i don't know how how to handle the fact that tos depends on i and j and not on latitude and longitude , where i and j corrisponds to the couple of the matrix of latitude and longitude , that is latitude is i x j and same longitude

M_D8993 2022-5-29

Hello! Was wondering whether you found the answer to this? I am also experiencing the same issue of thrying to get latitude and longitude into a vector (i.e. moving from a 2D array to 1D) so I can extract data for a geographical area. I think my indexing is not working because latitude and longitude are 2D.

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