[Tagging] Additional detail of Levee mapping via embankments

Martin Koppenhoefer dieterdreist at gmail.com
Tue Nov 19 08:43:04 UTC 2019

Am Di., 19. Nov. 2019 um 04:49 Uhr schrieb Joseph Eisenberg <
joseph.eisenberg at gmail.com>:

> Are you sure that the information that you want is not already
> available from a Digital Elevation Model?

I do not agree with this. DEMs (at least what is commonly and freely
available currently) do not provide the same kind of information, and are
generally lacking the resolution and in particular, do not contain specific
detail (e.g. shape), they treat every spot the same, are not focused on
features (you can recognize the features that are visible and discernible
on them, but they do not specifically represent them). We could also say:
the buildings and roads are already on aerial imagery, no need to map them
;-). Or peaks are contained in DEMs, why map them in OSM?

Large embankments should be clearly visible in the topography, so we
> do not need to reproduce them as 3D model in the database, any more
> than we need to map the exact contours of a quarry or mountain.

if there are interesting features on a mountain (particularly those
features with names or other attributes, wikipedia references etc.), we do
map them, (e.g. peaks, ridges, passes, ...)

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