Derek van Westrum grew up in Golden and has climbed more than half of Colorado’s fourteeners. He has an emotional attachment to those peaks, so he’s glad — and a little relieved — that his most recent assignment with the National Geodetic Survey didn’t turn up information that would have been a bummer for his fellow fourteener aficionados. The GDS measured the height of Colorado’s 58 peaks of 14,000 feet or higher with high-tech GPS technology, down to fractions of feet, and it released its findings on Thursday.