How can I determine elevation levels for a region in Java?

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I need to find out the elevation levels for a certain region (center is located at 132.159633, 43.350116).

For this purpose I went to the Elevation finder and downloaded there the relevant part of GTOPO30 data set.

Now I have two files with elevation data:

1. gt30e100n90.tif
2. Contents of the gt30e100n90_dem.zip archive, incl. gt30e100n90.dem.

How can I extract the elevation values (input: lon/lat coordinate, output: elevation at this location according to those data) in Java?

Note that I will only retrieve elevation data for buildings, hence I don't need to take into account that a particular coordinate may correspond to water.

I saw this project, there seems to be no source code there.



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