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Plat Narrative

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Loyal
(@loyal)
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Topic starter
 

I came across this a couple of days ago, I particularly liked the "vertical datum" note (the Geoid height in this area runs around -15.5 meters).

 
Posted : October 13, 2021 8:08 pm
RADAR, Jitterboogie, FL/GA and 12 people reacted
Mark Mayer
(@mark-mayer)
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Wow. Just ....  wow.

 
Posted : October 13, 2021 9:59 pm
Gene Kooper
(@gene-kooper)
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Well, if you had stayed retired you would have avoided this nitwittery.

 
Posted : October 13, 2021 10:12 pm
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Loyal
(@loyal)
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@mark-mayer Ya can't make this stuff up! Actually I HAVE seen worse...much worse.

On the upside, it tells me more about his survey, than the author probably intended.

 
Posted : October 13, 2021 10:16 pm
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Gene Kooper
(@gene-kooper)
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@loyal And don't forget to to include the difference between NAVD88 and the U.S.G.S. elevations being in NGVD29 (assuming that they looked at spot elevations on a USGS quad sheet for the "U.S.G.S. elevations").

 
Posted : October 13, 2021 10:21 pm
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Loyal
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@gene-kooper Some of the U.S.G.S elevations (including both contours & Bench Marks) predate NGVD29 by quite a bit (1901 Topographic Map) and BMs which were stamped with the elevation and SLAK (Salt Lake Datum)

 
Posted : October 13, 2021 10:59 pm

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Gene Kooper
(@gene-kooper)
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@loyal I think you are being too generous with the extent of his research. With that narrative, it is more likely that he came across a 1950s or 1960s vintage USGS topo quad rolled up and stashed in a corner of his office.

 
Posted : October 13, 2021 11:28 pm
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paden cash
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Posted by: @gene-kooper

Well, if you had stayed retired you would have avoided this nitwittery.

I love this word.  I can't say as I have ever heard it before. 

ps - for some reason it seems a particularly comfortable fit in a discussion of land surveying... 😉 

 
Posted : October 14, 2021 4:33 am
Shawn Billings
(@shawn-billings)
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That's incredible. Like you said, this is actually very informative Metadata. 

 
Posted : October 14, 2021 5:15 am

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Rover83
(@rover83)
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I've seen "Datum: GPS" quite a bit.

Concerning that note, it would seem to indicate that no geoid separations were applied and heights are ellipsoidal...which is something else I have seen a few times on topographic surveys. In this area the difference is ~70 USFt.

 
Posted : October 14, 2021 5:58 am
MightyMoe
(@mightymoe)
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The GPS thingy I'm guessing isn't the real problem. 

He found the original monuments and rejected them? "because of math"  That's a quote!!!!

 
Posted : October 14, 2021 6:07 am
Jp7191, Jp7191 and Jp7191 reacted
BStrand
(@bstrand)
Posts: 1552
Mapper of Things Member
 

@mightymoe

He found the original monuments and rejected them? "because of math"  That's a quote!!!!

Yeah, I actually find that more amusing than the GPS bit.  Hopefully someone came along and got this guy up to speed pretty quick, changed careers, etc.

 
Posted : October 14, 2021 6:40 am
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Norm Miller
(@norm)
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@mightymoe 

If the math is ambiguous shouldn't the existing monuments hold more weight?  And we don't know if he's on grid or ground. We do know he's in GPS nirvana.

 
Posted : October 14, 2021 6:51 am
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thebionicman
(@thebionicman)
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The scary part is, the narrative worked. We all know exactly how he wrecked the boundary.

If this guy was in my town we'd have to talk.. 

 
Posted : October 14, 2021 6:57 am
Jp7191, Nate The Surveyor, Jp7191 and 3 people reacted
Rover83
(@rover83)
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Posted by: @norm

And we don't know if he's on grid or ground.

And who knows what that "grid" could be and what projection it was derived from. I once came across an azimuthal projection...

 
Posted : October 14, 2021 7:06 am

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