Hi, We have a river polygon of several miles labeled as riverbank, yet the polygon and river linear data were obviously obtained from USGS NHD which is over 40 years old and not even close to where the river currently exist. A river linear is appropriate and easy enough to digitize using the aerial imagery. My goal is to delete the polygon and then edit/re-digitize the river.

When I select the river polygon and try to delete it, I receive the message the entire selected polygon is not visible and cannot be deleted. How do I cut the polygon to be within the visible editing range and/or cut the river polygon into editable sizes so I can correct this. Thanks for your help.


asked 28 Jun '18, 17:26

bob82many's gravatar image

accept rate: 0%

A simple short term solution without using JOSM would be to retag the riverbank polygon by prefixing the waterway value, for instance disused:waterway=riverbank or similar (see Lifecycle prefix, although most are for man made features, the concept is fine). Perhaps add a fixme too.

You can then draw the river centre line (or perhaps preferably the flowline or thalweg) in its current position (or as current as aerial imagery allows).

The net effect is that the old polygon will no longer be rendered and the new centre line will show up. The polygon can then be cleaned up at your leisure.

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answered 29 Jun '18, 13:30

SK53's gravatar image

SK53 ♦
accept rate: 20%

This sounds like you are trying to do this in iD, which given the size of the object is not a good idea.

I would typically recommend using JOSM for such work (this is not in the context of editor wars, if an object is so large that it can't be viewed in editing mode in iD it is simply a practical concern), which should have the added advantage of allowing you to modify the existing geometries easy and fast enough that wholesale deletion is not necessary (if possible we always try to preserve an objects history, naturally if it is an untouched import there is little to be gained from that).

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answered 28 Jun '18, 20:27

SimonPoole's gravatar image

SimonPoole ♦
accept rate: 19%

edited 28 Jun '18, 20:29

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question asked: 28 Jun '18, 17:26

question was seen: 1,638 times

last updated: 29 Jun '18, 13:30

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