So I looked into DW. By the map you can see it uses abou 1km detail, which is later interpolated into let's guess 100m polygons.
Then I looked into DW file structure. I looked at the world file. And it has nice header mentioning gtopo30.
gtopo30+Google=http://edc.usgs.gov/products/elevation/gtopo30/gtopo30.html
Which means 1km resolution.
I will try to download it tomorrow.
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