This is the piece that we are using for the Mekong. First the one-degree
tiles (You can see square holes where no tiles were produced for the ocean.)
were assembled into 10-degree blocks, and the small voids (Large voids are
ocean.) were filled. Parts of six big blocks (The NE and SW blocks were
not needed.) were assembled to cover the Mekong Basin. Problems with
voids at the junction of tile boundaries were fixed. You see that there
are surface elevations for much of the ocean. The come mostly from the
raw SRTM files, though more ocean elevations were added by the
void-filling algorithm. A good shoreline cannot be derived from the DEM.
We tried filling sinks and running hydrological
analysis, but ran into problems where 30" data was used to fill voids in
the Three Gorges area. We hope to fix this problem soon.
The DEM has 693380352 cells, so operations that
require intermediate files or arrays of 4 bytes/cell will exceed the
two-gigabyte limit and fail.