@mathteacher Actually my DC gives Grid, Ground, Ellipsoid distances at any time, a simple pull down arrow to switch between them.

@olemanriver The PLSS is based on Astronomic bearings. If you can find an area where the difference was measured accurately enough between 1800-195...

@mathteacher Mathteacher surveying equipment has automated it. If I survey a state plane job, all my equipment projects it with the GPS, the Robot, ...

@mathteacher Yep, this is what everyone working in state plane did and every day. We calculated each and every measured distance, it was part of the...

In MSP the Grid distance is 3.6' short, the AZ is almost 2d rotated, so there's some big distortions just using Montana. I'm not sure why you think a ...

@mathteacher Cool So how's that SP bearing along the runway? Anywhere near close to true north? Now do the Montana SP distance.

@glenn-borkenhagen We can use this equipment to measure very accurately, then we shrink the measurements so they represent a surface thousands of fe...

@rover83 I keep thinking it was called CMM, not sure why, I know Glen would remember.

@jitterboogie Unless the coal seam daylights there is normally water and methane trapped there. Dewatering will have to happen and it can effect large...

@lurker A sometimes poster here developed a geodetic program for the HP48 that we used way back when. It allowed you to traverse geodetically using co...

@lurker each bearing will be rotated to geodetic north, east west lines will not have the same bearing shown NE or SW. Put into autocad and treated li...

@pfirmst One thing is certain; in the big mines there will be movement. We saw that often during our mine survey days. Control could move feet withou...

@rover83 Yes, but I will say those drawings are super easy to use. When I tie into them I don't use the state plane numbers. I'm more interested in ma...

@olemanriver I recently used one of their surveys to do a 280Ac tract with 28 monuments from 5 different surveys. This tract was basically surrounded ...

@jitterboogie I would love to use that sort of system. Local horizon system using a simple rotation matrix is even easier to model than a projection...

@mightymoe do you place geodetic north on surveys or grid north where you are located. Mostly it's State Coordinate System bearings and "surface" d...

It will be a heavy lift to make state plane usable in higher elevation states. I suppose it's worth an attempt but the scale of the problem will mak...

Using TBC in a state plane projection I create two ground points using the create point function and bearing/distance. Inversing the points, the resu...

1. The grid (scale) factor doesn't tell you the difference between ground and grid, so the answer is still unknowable. 2. That's an add/subtract prob...

@mightymoe When using the double-bubble as a way to check rod plumbness, should they be at 90° or 180° to each other. Does it matter? If you do 1...