[OSM-newbies] Fixing the Mississippi River

[Dan Ball]

Hi all,

I've been tinkering OSM data for the first time over the last week and finding my way around. I've stumbled upon something interesting: the riverbank of the Mississippi River seems to be missing between Maxey Island, IL (http://www.openstreetmap.org/?lat=39.0043&lon=-90.6892&zoom=13&layers=M) and just south of Quincy, IL (http://www.openstreetmap.org/?lat=39.897&lon=-91.4429&zoom=12&layers=M). It seems the missing riverbanks cause the river to "disappear" between these two areas on the openstreetmap.org viewer.

I'd be happy to contribute if the data are indeed lacking here – I've just never edited OSM data and wanted to clarify a few things before I started messing with such a major geographic feature:

1) The source of the riverbank data appears to be NHD where the features end on both sides. Should these features be connected by hand, or should this hydrography data be imported from elsewhere?

2) Does it matter whether the nodes are placed in a clockwise or counterclockwise matter?

3) Should the addition be one multipolygon, or broken up into multiple multipolygons?

Thanks!

Dan
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