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Apr 1, 2021 17:41:45   #
Jfendley
 
I would not stand there for any length of time, just saying.....

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Apr 1, 2021 19:20:08   #
flip1948 Loc: Hamden, CT
 
jerryc41 wrote:
Someone posted a question about this mark painted on a road in town. Someone replied that it's a survey marker that can be seen by satellites. I hope it isn't a bombing target.

Have you seen anything like this before?

I'm going with the aerial survey marker.

I used to work for a Civil Engineer and Land Surveyor, did all of his CAD drawings.

Several years ago we did an interesting project. A local (to him) swimming club owned a peninsula on a lake that had to be mapped. We used three different types of surveying to complete the job, conventiol survey, aerial survey and GPS survey.

The aerial survey was used to determine the outline of the peninsula and was tied to the conventional survey using aerial markers.

It was also known that the peninsula was in two different towns so we had to determine where the town line cut across the peninsula so we could determine the percentage that lay in each town for tax purposes. We hired a crew to shoot two town line monuments about a mile apart using GPS. Once the data was imported into the drawing it was a simple matter of drawing a line connecting the two monuments and voila...we had the town line across the peninsula. AutoCad then gave me the areas each side of the town line.

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Apr 1, 2021 19:32:39   #
Ken0west
 
Sorry folks, these are markers used by highway patrol or local police using aircraft to measure how fast vehicles are traveling as seen from the air. In other words, how long it takes a vehicle to travel from one marker to another. Then, the info is radioed to either a squad car or motorcycle farther down the street. When you see these markers, watch for others and time how long it takes you to travel the distance in-between. You do the math!

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Apr 1, 2021 21:46:30   #
Fotoserj Loc: St calixte Qc Ca
 
Aerial map surveys are usually lot bigger and take the form of 4 large triangle so they can be superpose to properly aligned strip of picture

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Apr 1, 2021 23:41:33   #
clickety
 
I think it tells all delivery trucks to not proceed any further without a two week delay.

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Apr 1, 2021 23:42:46   #
Bret Perry
 
Arrr. Treasure be buried there, matey!

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Apr 2, 2021 00:16:57   #
carlberg
 
Marks like that along the shoulder of highways are used by helicopter cops to determine the speed of cars. All it takes is a stopwatch to catch a speeder.

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Apr 2, 2021 06:42:14   #
Drbobcameraguy Loc: Eaton Ohio
 
jerryc41 wrote:
Someone posted a question about this mark painted on a road in town. Someone replied that it's a survey marker that can be seen by satellites. I hope it isn't a bombing target.

Have you seen anything like this before?


Ever notice those big white X's painted on roads? If you haven't, you'll probably start noticing them now. (And you may also see T- or L-shaped versions). They're known as aerial targets, and their purpose is to provide control for aerial mapping flights

This quote is from a survey company compliments of Google

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Apr 2, 2021 06:58:18   #
DirtFarmer Loc: Escaped from the NYC area, back to MA
 
carlberg wrote:
Marks like that along the shoulder of highways are used by helicopter cops to determine the speed of cars. All it takes is a stopwatch to catch a speeder.


Look at the road in the photo. Fairly narrow, no center line, on a curve. Not the sort of road that is patrolled by aircraft. Not likely to be a speed measurement mark. I’d go with the aerial survey mark.

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Apr 2, 2021 07:34:23   #
Drbobcameraguy Loc: Eaton Ohio
 
DirtFarmer wrote:
Look at the road in the photo. Fairly narrow, no center line, on a curve. Not the sort of road that is patrolled by aircraft. Not likely to be a speed measurement mark. I’d go with the aerial survey mark.


The lines for aerial speed traps are just a pair of lines a set distance apart. They time your car starting at the first line and ending at the second. Then they do the math.

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Apr 2, 2021 10:41:59   #
Watash
 

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Apr 2, 2021 13:36:30   #
CWS Loc: El Paso, TX
 
My wife asked the very same question when we observed some of these "Xs" off the side of the road we were traveling on. I told her they were dropping sterile flies at these sites so the flies couldn't reproduce. After thing about it for a while she finally asked "How do they sterilize the flies?" Well, while an assistant holds their tiny legs apart the doctor gets the knife out and....I had to pull over until the swelling in my eye went down so I could drive.

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Apr 4, 2021 14:00:52   #
captxmas Loc: San Francisco Bay Area
 
These are generally used for aerial Surveys but....When seen on Highways they are often used for start/stop points for Law Enforcement to measure speed. Info is relayed to officers down the road on the ground to issue the ticket. Often seen as a solitary "bar" painted on the side of the road at a right angle to the path of travel.

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