Getting values using coordinates indexes

I have a very simple question,

I have 3 matrices extracted from a netcdf file, latitude, longitude, and data values (Z). I would like to know the Z values corresponding to specific latitude and longitude points. How can I do this?

Thanks

[SnovG]

These are thress matrices with the same size, 2630x1083 double, it is actually remote sensing data in netcdf format. I want to get the values corresponding to the coordinates. thanks

Answer 1

[Chad Greene]

You can do this a few ways. If you know the exact lat and lon you're interested in, say (30N,120E), it's simply

Z(lat==30 & lon==120)

Alternatively, you can use interp2.

[SnovG]

Thank you Chad, that works, but what if I know the approximate coordinates and I want to find the closest point to those coordinates? Thanks

[Chad Greene]

Depending on what you're trying to do, you could round your lat/lon of interest to the nearest gridded lat/lon value, or you could use interp2 with the 'nearest' option, or you could use near2, which simply finds the nearest row and column index.

[SnovG]

thank you!

[K E]

Once you know the index to the lat/lon point you want, you can extract just the value there using ncread. In other words you don't have to pull the whole matrix into Matlab.