A nice Section Corner inside a ROW. Need to show all the section line crossing ties as they intersect the ROW.
But they ended up completely inside a spiral; a spiral with a jog.
It took longer to do the detail than other whole sheets.
I removed all the text:
I think flogging needs to make a comeback for anyone that writes a spiral into a ROW deed (just kidding). But it is so unnecessary.
I think flogging needs to make a comeback for anyone that writes a spiral into a ROW deed (just kidding). But it is so unnecessary.
:good:
Thank God and Professor C.L. Miller for COGO.......;-)
At least most TxDot r/w are simple curves no matter what is happening with the center line alignment.
I think they threw in spiral r/w with those best fit situations hoping their error would not be found.
my 0.02cents
I believe in the flogging...not kidding. Glad it's you working on that project and not me!
B-)
Pablo
Glad it's you working on that project and not me!
Now you're just being mean;-)
But it's good being in charge-you can shove something like that off onto the next guy down the line. And he's plugging away, maybe 6 sheets left.
A Harris
Are you trying to say that they are sensible in Texas?
I don't know when these spirals first started showing up.
I think it may have started just after WW2.
That's about the time for first of these kind of deeds that I've seen.
The old ROW's are simple curves, about the late 60's to the 2000's they really fell in love with them.
The ones that are really annoying are where they hit the TS proceed down the spiral a few feet and then jog out 20-30. Saved $2 of land purchase and cost hundreds in monumentation.
spiral curve offsets
just published in December issue: http://www.profsurv.com/magazine/article.aspx?i=71235
how to calculate spiral curve offsets.
I'm proud to say the the author is one of my co-workers - Jim Crume.
enjoy.
spiral curve offsets
I was wondering what Jim Crume was up to! Last saw him in Casper WY in the early 80's, tell him Paul Reid said hi. I keep seeing his name pop up on the Mineral Surveyor list so I know he's still alive. Would like to sneak up on him some day, is there any chance of doing that?
Pablo
There have been quite a few DIFFERENT "spiral" Curves used over the years (both Railroad & Highway).
Out here in the Great Basin, the vast majority of “spiral” (transition) Curves that effect Right-of-Way limits, are Searles Spirals. There are a few Talbot, and Railroad 10-Chord (and a few “odd-balls”), but they are pretty RARE when you are talking about Railroad ROW(s). Highway ROWs are another story, some are Searles, some are Euler (clothiod), or various other mathematical definitions.
As a general rule, ROWs are NOT “spiraled,” except of course, when 'they' ARE.
There were many miles of Searles Spiral Right-of-Ways created in Utah in the early 1900s (1903 for the Oregon Short Line for example).
Searles “spirals” are a piece of cake, because they are NOT a “TRUE Spiral,” but a compounding series of circular curves, which make TRUE parallelism, not only possible, but easy to compute.
In MOST (but not all) cases, there was little (or no) reason for spiraled ROWs, but sometimes there is...and... $#it happens.
I rather enjoy Searles Spirals, but really despise most all the rest!
BTW, I have encountered quite a number of Utah State Highways, that were designed and built in the 1930s-1940s, that not only used Searles spirals, but CHORD definition circular curves too!
Loyal
A Harris
I would think it more of a case that the r/w division did not want to calculate areas of taking with spiral boundaries.
Those darn transitions can really ruin my day too.
Let the floggings begin.
😉
Link to Jim's website with spiral curve calculator
Jim asked me to post this:
Would you also post the link to my website with exhibits and a spiral curve calculator, freeware.
http://www.cc4w.net/products.html
Pablo - didn't see an email in your profile - send me a PM with your email and I'll forward it to Jim.
Link to Jim's website with spiral curve calculator
Looks like a great resource!
I didn't have time to really get into it yet, but I downloaded the .pdf tutorial, and saved the link.
It appeared (to me), that it ONLY treats "10 chord" spirals (which is fine), but most spirals that I run into are Searles Spirals. Like I said below, Searles are easy, and this program will be VERY helpful in dealing with 10-chords (which always caused me heartburn in the past).
Thanks for the link,
Loyal
