How to get the exact lat lon position of nc file data

Hi Folks

Thanks in advance

I could get the indexed position of the rows and columns of max / index value data with the below code

maxval=max(data(:));

[xmax,ymax]=find(data==maxval);

[ii,jj]=find(data >= 0 & data < 2);

but I need only the exact x and y location coordinates

I have classify the pixel values range according to my requirement as below

idx = data >= 0 & data< 2 ;

pix1 = data(idx);

idx = data >= 2 & data < 4 ;

pix2 = data(idx) ;

idx = iwant >= 4 & iwant < 6 ;

pix3 = data(idx) ;

idx = data >= 6 & data < 8 ;

pix4 = data(idx) ;

idx = data >= 8 & data < 10;

pix5 = data(idx);

idx = data >= 10 & data < 15 ;

pix6 = data(idx) ;

idx = data >= 15 & data < 20 ;

pix7 = data(idx) ;

idx= data >= 20 & data < 95;

pix8 = data(idx);

please find the atached data and lat, lon position

Kindly help

Answer 1

[ag]

Hi @Karthik M,

To extract the exact x and y coordinates of pixels that fall within specific value ranges in a matrix, you can modify your approach slightly. Instead of just extracting the pixel values, you need to also find their corresponding indices.

Below is a modified version of your code with explainatory comments:

% Example data matrix
data = randi([0, 100], 10, 10); % Replace with your actual data

% Initialize cell arrays to store coordinates
coordinates = cell(8, 1);

% Define ranges and find indices for each range
ranges = [0 2; 2 4; 4 6; 6 8; 8 10; 10 15; 15 20; 20 95];

for k = 1:size(ranges, 1)
    % Get logical index for current range
    idx = data >= ranges(k, 1) & data < ranges(k, 2);
    
    % Find coordinates of pixels in this range
    [x, y] = find(idx);
    
    % Store coordinates in the cell array
    coordinates{k} = [x, y];
end

% Display coordinates for each range
for k = 1:size(ranges, 1)
    fprintf('Coordinates for range [%d, %d):\n', ranges(k, 1), ranges(k, 2));
    disp(coordinates{k});
end

Coordinates for range [0, 2):
Coordinates for range [2, 4):

     4     6
     1     7
     5     8
     7     8

Coordinates for range [4, 6):

     2     3

Coordinates for range [6, 8):

     8     7

Coordinates for range [8, 10):
Coordinates for range [10, 15):

     5     4
     9     4
    10     5
     2     6
     8     6
     9     6
     6     7

Coordinates for range [15, 20):

     8     1
     1     5
     4     5
     3     8
     3     9
     5     9
     6     9
     9     9
     2    10
     8    10

Coordinates for range [20, 95):

     1     1
     3     1
     4     1
     5     1
     6     1
     7     1
     9     1
    10     1
     1     2
     2     2
     5     2
     6     2
     7     2
     8     2
     9     2
    10     2
     1     3
     3     3
     4     3
     5     3
     6     3
     7     3
     8     3
     9     3
    10     3
     1     4
     2     4
     4     4
     6     4
     7     4
     8     4
    10     4
     2     5
     3     5
     5     5
     6     5
     7     5
     8     5
     9     5
     1     6
     3     6
     5     6
     6     6
     7     6
    10     6
     2     7
     3     7
     4     7
     5     7
     7     7
    10     7
     2     8
     4     8
     6     8
     8     8
     9     8
     1     9
     2     9
     4     9
     7     9
     8     9
    10     9
     1    10
     3    10
     4    10
     5    10
     6    10
     7    10
     9    10
    10    10

Hope this helps!