I sometimes like to trace rivers from the landsat wms images in Guyana. They're not very good quality but it works. Now Mapnik doesn't render waterway=river at low zoom levels so I switch to Osmarender to survey larger areas and see where there's not many rivers traced yet. I've done this a bit and was wondering how Guyana was starting to compare to nearby countries and how much river density there is in OSM.
So I zoom out a bit and look around to find this neat little area<http://www.openstreetmap.org/?lat=-10.21&lon=-57.34&zoom=7&layers=O> . At first I was zoomed out further and it looked like a blue square of random static but on checking it with the WMS there are indeed little rivers and streams in those areas. It's an IBGE import ( http://en.wikipedia.org/wiki/Brazilian_Institute_of_Geography_and_Statistics) of that area and the waterways do agree very roughly so it is useful as a first draft. Keep that up and Brazil will turn completely blue! :-) Just a random thing I thought newbies would find interesting. The Big Blue Box in Brazil! -Don.
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