The Orange County Chapter of California Land Surveyors Association posted this graphic on their Facebook page yesterday.
I can't attest to the accuracy... but
That sounds like so much fun. I can imagine what it's like, today, since it's close to Halloween, I'm driving a stake through the last calibrated file I ever hope to use. It's been sitting out there since the late 90's. I can't wait to blow that thing up and never see it again.
Just out of interest, what happens where two jurisdictions using different foot definitions meet? Or do you organise things such that no property crosses the state line. We don't have that problem over here as property ownership can extend over County or even National (eg. Scotland/England) boundaries.
The coordinate systems are quite different, the issue of US vs. International feet is swamped by the difference in the systems. There can be 3 degrees of rotation and very different scale factors so either the state line creates a demarcation line for the surveys or one system is extended into border state. Projects such as an interstate highway will usually terminate each direction along the state line with two different systems controlling, for private boundaries there is generally a state system picked that controls across the line, if state plane is used.
As you say, property boundaries do not cross State lines. There may be cases where one entity owns adjoining properties on both sides of such a line. But they would be considered discrete parcels. I have seen cases where single properties span county lines but this is rare.
Nevertheless there are circumstances where a project spans state plane zone boundaries, and sometimes those zones use different foot definitions. The solution is to just do the whole project using one zone or the other.
Sounds very confusing. I'm pleased we are a "small" island and just have to cope with scale factor (and idiot architects).
The Orange County Chapter of California Land Surveyors Association posted this graphic on their Facebook page yesterday.
I can't attest to the accuracy... but
Michael Dennis showed this exact slide in his Oct 10 webinar presentation on State Plane 2022 at about 0:52.
@chris-mills
I have had COE projects that run beyond Zone boundaries... then we would calc on the same definition they did and state full metadata for repeatability ... Petaluma River was one, in the upper extents many miles from the SF Bay. That one drove the local public works guys nuts.
I don't remember encountering a Jurisdiction conflict, but have had to back figure the Foot version used when it was not stated.
so, convert to Lat/Lon or Metric, then convert again to the desired Foot.
don't forget Epochs! We rub into that more out West with the fault/plate creep... faster than you would imagine!
The linked info says this is 0.01' in a mile.?ÿ Few people should be getting their panties in a twist over this.?ÿ But drama is drama...
Many of us use state plane coordinate systems... those values are in the millions. ... so it Is Significant.
20 0r 30 feet in error.
PS: we are Required to use SPC, by many various agencies.
Yes, the homeowner would never know.
Okay, I guess I need a new pocket tape 🙁
Wikipedia uses US survey feet to convert the length of Interstate 40 from miles to kilometers. Using International feet would make roughly 8 millimeters difference. No telling what the result would be if a pocket tape were used to measure I-40.
I'm glad that I will be retired by 2020, I can't afford NEW equipment.
Wikipedia uses US survey feet to convert the length of Interstate 40 from miles to kilometers. Using International feet would make roughly 8 millimeters difference. No telling what the result would be if a pocket tape were used to measure I-40.
8.2 meters.
