MathTeacher submitted a new blog post
HereÛªs a question for Lambert state plane coordinate system users. Over how big an area can a Lambert state plane coordinate system give usable results? Before you answer, consider the following...
Thanks, Gavin. Theory says that Lambert state planes work like this. I'm not a surveyor, so I have to use whatever measured lines I can find for testing stuff and airports are a rich source.
The first ex-NC line I used for this piece was the Arlington CBL in your state of Washington. I wanted to verify the result with the Sand CBL, but apparently it has been altered by construction, so I couldn't find a data sheet for its endpoint. Geocaching.com has pictures taken on the Arlington CBL, but not Sand. Maybe you're familiar with one or both of them.
It was a fun research project. The result is not readily applicable in day-to-day surveying, but it does illustrate a couple of Lambert principles, so maybe it has some value.
I had not looked at Earth Point until tonight. It's kind of cool to select State Plane Zone 3200 (NC), enter the NC state plane coordinates computed in the post for Runway 4L, and then select Fly to on Google Earth. Units is set to meters.
http://www.earthpoint.us/StatePlane.aspx
x = -6951867.965, y = 1782678.024
The coordinates for Runway 22R work also. Lambert state plane projections (excuse me, Melita, I meant coordinate systems) have a long reach indeed.
