[GRASS-user] r.watershed and bridges

GRASS GRASS user
1

Using the new ASTER DEM data it seems to me that the resolution is good enough to show the elevation of the road surface on bridges crossing a riverbed. I see some places where the delineated stream comes to a bridge, then, instead of going under the bridge, turns 90 deg and runs along the road to a low spot, then crosses. So the bridge is "seen" a dam. What's the best way to deal with this? r.carve? or just locally editing the raster somehow?

Thanks,

Micha

2

If you have a small region and you know, where the bridges are, I guess
fastest method is to do it manually.

Otherwise r.carve would do good here.

To find bridges maybe the gradient of hight will help (slope).

Best regards,
Achim

Micha Silver schrieb:

Using the new ASTER DEM data it seems to me that the resolution is good
enough to show the elevation of the road surface on bridges crossing a
riverbed. I see some places where the delineated stream comes to a
bridge, then, instead of going under the bridge, turns 90 deg and runs
along the road to a low spot, then crosses. So the bridge is "seen" a
dam. What's the best way to deal with this? r.carve? or just locally
editing the raster somehow?

Thanks,

Micha

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