GDEM - SRTM COMPARISON
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The rollout image is from 1" ASTER GDEM data. Move the mouse onto and away from the image to switch to and from the rollover image, which is SRTM 3" upsampled to 1". Almost all the extra details in the ASTER GDEM image are fictional artifacts; there is no real increase in detail level. The most obvious artifacts are on low lying ground, but there are spikes and pits on higher ground too, especially in the north west of the image. Perth is near the south boundary of the image; the River Tay, which is apparently flowing over 40 metre barriers in the Aster image, flows into Perth from the north, and out to the east into the Firth of Tay, which is not flattened in the Aster image. The elevation of the terrain shown in the image rises to just over 600 metres.