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mathteacher
mathteacher
@mathteacher
Member
Joined: June 15, 2013 9:58 am
Last seen: September 24, 2026 2:51 pm
Topics: 158 / Replies: 2104
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RE: Comparing two surveys

Of course, the real problem is likely that the two surveys indeed did not start from the same base. That's indicated by the minimal rotation and the n...

11 months ago
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RE: Comparing two surveys

@landbutcher464mhz Yes. Refer to translation and rotation in any Precalculus textbook.

11 months ago
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RE: Comparing two surveys

@gary_g has the right take. I do this in Excel. It goes like this. Northing transform: surveyor's Northing = a + b*RFC Northing + c*RFC Easting In...

11 months ago
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RE: Comparing two surveys

Have you converted to the feet that you want to use? The units need to be the same in both systems. Your Northings are substantially greater than th...

11 months ago
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RE: Public Road Records - Student Question

Here's the tail end of a ChatGPT query that might help. Good luck! Nice — thanks. Short answer first, then the supporting detail and w...

11 months ago
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RE: Public Road Records - Student Question

The most famous PA "road" completed in 1940 was the PA Turnpike, 160 miles built in 23 months utilizing an abandoned railroad and its many tunnels? ...

11 months ago
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RE: Scale Factor

@norman-oklahoma From Google AI: The foot based on the exact conversion of 1 inch to 2.54 cm is called the "international foot" because its value...

11 months ago
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RE: Scale Factor

@mightymoe Did the change to International Feet require legislative approval or was it just done on a whim?

11 months ago
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RE: Scale Factor

@mightymoe What they did was verify that the legacy scale factor is an extremely good one. The ratio x/y^2 is a sort of plane version of a/b^2, whi...

11 months ago
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RE: Spitballing at the Office

First rule of board work for Geometry teachers: If the line misses a point, make that point bigger.

12 months ago
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RE: The "simple" math we used to know how to do in our heads

If the right side was 32, x would be 2 1/2.

1 year ago
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RE: Thinking of leaving CA…

You really have to look at the income possibilities. Lower cost of living often means lower pay for the same work. I don't know how accurate these num...

1 year ago
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RE: Behavior of NOAA Magnetic Field Calculators Near Geographic Poles

@gary_g Put another way, it takes a rare bird to confuse angle of inclination with polarity.

1 year ago
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RE: Behavior of NOAA Magnetic Field Calculators Near Geographic Poles

I think that I prefer the ChatGPT answer to this one:/p>

1 year ago
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RE: Behavior of NOAA Magnetic Field Calculators Near Geographic Poles

At 22.29 degrees west, 90.0 degrees south, magnetic declination is 0.0 degrees E and at 157.71 degrees east, 90.0 degrees south, declination is 180 de...

1 year ago
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