The gridded average net effect of NASA's urban adjustments on all their urban stations. (globalwarmingsolved.com)
Similarly, its notable that the GISS urban adjustments (via nightlights) don't appear to have a large impact vis - a-vis the unadjusted data, a point that others have previously made. (clearclimatecode.org)
Over the last few days, I've shown that Hansen et al 1999 illustrated and discussed the effect of the NASA adjustment for two stations (Phoenix, Tokyo) where the NASA urban adjustment yielded the expected adjustment (denoted in these posts as a «positive» adjustment). (climateaudit.org)