if you see a discrepancy between aerial imagery and OSM, before you go adding/changing stuff, check on the history of the stuff that's there and see if another mapper has worked on things recently (for some value of recently.) i have done a bunch of work in the past month adding in a new traffic circle on US 4 in Rensselaer County, NY, using GPS traces. as part of the process, i removed a slip ramp from I-90 that was taken out by DOT when they built the new circle. i just now discovered that another mapper added the slip ramp back in, presumably because it's in the Bing imagery, which is at this point 2 or 3 years old.
this isn't the first time i've been through this; a year or so back a couple of armchair mappers repeatedly changed a part of Troy to match obsolete imagery and i kept having to ask them not to and put back in the recent changes. i now put README tags on the ways but if i delete something i have no place to put a README tag. imagery goes out of date. armchair mappers must never forget that. if the imagery doesn't match the map, contact a local mapper if you can identify one. you could be fixing something that wasn't actually broken. thanks, richard
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