Editing Talk:2920: Survey Marker
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"datums." [[User:JohnHawkinson|JohnHawkinson]] ([[User talk:JohnHawkinson|talk]]) 14:38, 16 April 2024 (UTC) | "datums." [[User:JohnHawkinson|JohnHawkinson]] ([[User talk:JohnHawkinson|talk]]) 14:38, 16 April 2024 (UTC) | ||
− | FWIW, there is a marker at the end of my street, and I have seen others. I know "in the ground" is a figure of speech; all I have seen | + | FWIW, there is a marker at the end of my street, and I have seen others. I know "in the ground" is a figure of speech; all I have seen were set in rock (often with molten Lead/Zinc) so they didn't travel. My road we have boulders nobody is likely to move. Other places like Appalachian Trail, set in the mountain stone. In sandy South Jersey they set a couple tons of concrete and set the marker in that. --[[User:PRR|PRR]] ([[User talk:PRR|talk]]) 23:41, 16 April 2024 (UTC) |
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::"Help defend our timeline, make the switch to Swatch time 'today'!" | ::"Help defend our timeline, make the switch to Swatch time 'today'!" | ||
:: [[User:ProphetZarquon|ProphetZarquon]] ([[User talk:ProphetZarquon|talk]]) 13:50, 17 April 2024 (UTC) | :: [[User:ProphetZarquon|ProphetZarquon]] ([[User talk:ProphetZarquon|talk]]) 13:50, 17 April 2024 (UTC) | ||
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This reminds me of the prime meridian that's laid out on the ground at the Greenwich Royal Observatory for tourists to stand on. Unfortunately, it uses an old datum and the actual prime meridian under WGS84 is about 100 metres to the East. Fortunately, the British Isles are moving slowly North East so the two meridians will coincide at some point. [[User:Jeremyp|Jeremyp]] ([[User talk:Jeremyp|talk]]) 09:09, 17 April 2024 (UTC) | This reminds me of the prime meridian that's laid out on the ground at the Greenwich Royal Observatory for tourists to stand on. Unfortunately, it uses an old datum and the actual prime meridian under WGS84 is about 100 metres to the East. Fortunately, the British Isles are moving slowly North East so the two meridians will coincide at some point. [[User:Jeremyp|Jeremyp]] ([[User talk:Jeremyp|talk]]) 09:09, 17 April 2024 (UTC) | ||
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:::The other day I had reason to pass by a 'countryside' Prime Meridian sign (and plaque-on-a-brick-plinth, IIRC), at a [https://www.openstreetmap.org/#map=17/53.67901/0.00000 seemingly arbitrary point] very near where it eventually crosses the coast into the North Sea (if they don't have a sign ''on'' the coast, I'd be surprised, but I had no cause to go across that way too). | :::The other day I had reason to pass by a 'countryside' Prime Meridian sign (and plaque-on-a-brick-plinth, IIRC), at a [https://www.openstreetmap.org/#map=17/53.67901/0.00000 seemingly arbitrary point] very near where it eventually crosses the coast into the North Sea (if they don't have a sign ''on'' the coast, I'd be surprised, but I had no cause to go across that way too). | ||
:::Having manually adjusted that URL to be ''explicitly'' zero east/west, it may well be that map-zero doesn't match the 'signed' zero. The physical location would likely be (without checking StreetView for accurate confirmation) that little stub of apparently inconsequential footpath, north off Welwick Road, just a little to the east of the "P"arking spot (a rough layby, clearly intended purely for the odd passerby who wishes to park up and peruse the signage). Which might well be 100m W (minus adjustment for approximately 2° latitude's additional longitudinal curvature) of the web-page centre when forced to display a nominative 0° position. [[Special:Contributions/172.70.163.49|172.70.163.49]] 12:12, 18 April 2024 (UTC) | :::Having manually adjusted that URL to be ''explicitly'' zero east/west, it may well be that map-zero doesn't match the 'signed' zero. The physical location would likely be (without checking StreetView for accurate confirmation) that little stub of apparently inconsequential footpath, north off Welwick Road, just a little to the east of the "P"arking spot (a rough layby, clearly intended purely for the odd passerby who wishes to park up and peruse the signage). Which might well be 100m W (minus adjustment for approximately 2° latitude's additional longitudinal curvature) of the web-page centre when forced to display a nominative 0° position. [[Special:Contributions/172.70.163.49|172.70.163.49]] 12:12, 18 April 2024 (UTC) | ||
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