Coordinate Conversion from XY in Satellite image to latitude and longitude

My associate and I are trying to convert XY Coordinates in a satellite image to latitude and longitude.

Here is the process:

We opened the image into Matlab using " geotiffread" function,

Did the process and found some XY Coordinates.

Now we need to convert back those [x,y] coordinates into latitude and longitude.

How can we do that? Thanks.

Answer 1

[KSSV]

file = 'Matlab_Question.tif' ;
info = geotiffinfo(file);
[x,y] = pix2map(info.RefMatrix,1,1);
[lat0,lon0] = projinv(info, x,y) ;

[x,y] = pix2map(info.RefMatrix,864,859);
[lat1,lon1] = projinv(info, x,y) ;

[Cyrus]

Thank you, that works, but I have one question about that,

As you know the size of the image is 865 X 859, I tried some indices out of the image of the boundary and Matlab didn't show me any error.

it that ok?

[KSSV]

I think it can be checked... You can plot those values which are not the indices, with the indices which are from the image; check whether those points are really falling outside...

Answer 2

[KSSV]

If X, Y are in distance (Km,m) use km2deg...

http://in.mathworks.com/help/map/ref/km2deg.html

[Cyrus]

Hi, thanks for response. No they are not, they are pixel coordinates(Row, Col)

[KSSV]

You mean they are row and column indices?

[Cyrus]

Yes, exactly

Answer 3

[KSSV]

That case...you can fit the limits of x axis and y axis...and get the X,Y grid....you can directly get the values in degrees itself....

Attach the image here..let me give a try...

[Cyrus]

Satellite image is attached, Thank you