Talk:Lizard Head

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Correct elevation

GNIS says this mountain's elevation is 12,995 feet. See reference number 3. I plan on editing the article to reflect this. Jeffrey Beall (talk) 11:21, 13 August 2019 (UTC).[reply]

So, GNIS is not the best source of summit elevations, for two reasons.

GNIS elevation data is not taken from benchmarks: it's derived from a digital elevation map. For very steep peaks (like Lizard Head), that means the GNIS elevations often underestimate the true height. If you go to the Peakbagger site for Lizard Head, and you look at the USGS topo map, you'll see that the peak elevation is shown at 13,113 feet. That's substantially higher than the GNIS elevation. That would be the true elevation of the peak.
Both GNIS and topo maps use the NGVD29 vertical datum. The elevation of above sea level depends on the definition of the shape of the Earth. The most accurate and modern shape of the Earth is captured in the NAVD88 vertical datum, which, for peaks in southwest Colorado, add about 6 feet to the elevation. Peakbagger lists the NAVD88 elevation (so it's verifiable). The guidance from WP:WikiProject Mountains is to use NAVD88 --- Footwarrior converted this article in 2013, while Buaidh added an explanatory footnote in 2014.

Bottom line: I think that the elevation in the article should remain at 13,119 feet in the NAVD88 datum. —hike395 (talk) 15:37, 13 August 2019 (UTC)[reply]

Thanks, this is helpful. I just changed my plans. Jeffrey Beall (talk) 14:23, 14 August 2019 (UTC).[reply]