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Pseudo PID numbers


Bill93

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Posted

NGS ON0780 or GC entry ON0780 is a typical old mark whose box score includes the RM's each having an apparent pseudo-PID. We have discussed before that these aren't in the alphabetic regions that were formerly used to identify marks having data sheets, and no data sheet could be brought up for them because they had no geodetic data nor description.

 

Well, it seems that RM4 has now been measured and described and now has a data sheet CI5736. So just because it wasn't a valid PID at one time doesn't keep it from becoming one.

Posted

Hi Bill,

 

Excellent point. I often find this to be the case when a Reference Mark was added to the Triangulation Station at a later date--which is precisely the situation you described.

 

-Paul-

 

 

 

ON0780 STATION RECOVERY (1969)

ON0780

ON0780'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1969 (LFS)

ON0780'STATION MARK, REFERENCE MARK NO. 1 (AZIMUTH MARK), AND REFERENCE

ON0780'MARK NO. 3 WERE RECOVERED AS DESCRIBED AND FOUND IN GOOD

ON0780'CONDITION. REFERENCE MARK NO. 2 WAS FOUND DESTROYED BY ROAD

ON0780'CONSTRUCTION. THE LINE OF SIGHT WAS OBSTRUCTED BY A CORN FIELD

ON0780'SO NO MEASUREMENT OR DIRECTION WAS TAKEN TO REFERENCE MARK

ON0780'NO. 3.

ON0780'

ON0780 REFERENCE MARK NO. 4 WAS SET.

 

Posted

I don't think it became valid in 1969. They would have probably given it an ONxxxx data sheet if it was measured then. I'm guessing it didn't get a data sheet until it was measured in 2007.

Posted

I agree about the time sequence. I see that the coordinates for CI5736 were obtained with a consumer-grade handheld GPS unit. Also, this is one of those rare NGS data sheets which has photographs of the station.

 

From the pictures, we know that the MN DOT representative uses a Garmin and drives a vehicle which is ideal for benchmark hunting. I doubt that the operator ever gets challenged by a land owner. <_<

 

By the way, I've had several of those Garmin "bean bag" dash mounts during the past decade. They work very well. Besides making it easy to swap vehicles, I like being able to keep it off the dashboard, except when hunting. This prevents the Sun from burning a pattern into the dash.

 

-Paul-

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