End area calculation
End area calculation
(OP)
Here is a blast from the past.
Waaay back when I was a field engineer, we had an algorithim that would allow us to compute the cross-section area for cut or fill sections, based on x,y coordinate pairs. As I recall, we took the last two coordinate pairs and added them to the end of a string of coordinates, then did some kind of cross multiplication to get the area.
We would then average the areas, multiply by the distance between sections, etc.
Does anyone know what I'm talking about? Can you describe the process? I have a few cross sections I need to compute, and I don't want to go to all the trouble of learning a new software package for something simple like this.
As always. Thanks, this forum rocks.
Waaay back when I was a field engineer, we had an algorithim that would allow us to compute the cross-section area for cut or fill sections, based on x,y coordinate pairs. As I recall, we took the last two coordinate pairs and added them to the end of a string of coordinates, then did some kind of cross multiplication to get the area.
We would then average the areas, multiply by the distance between sections, etc.
Does anyone know what I'm talking about? Can you describe the process? I have a few cross sections I need to compute, and I don't want to go to all the trouble of learning a new software package for something simple like this.
As always. Thanks, this forum rocks.





RE: End area calculation
On-line, here are 2:
http://www.tpub.com/inteng/10e.htm
http://www
RE: End area calculation
RE: End area calculation
BTW, I checked it with my HP 41CX with the survey pack. Answer is within 3%.
RE: End area calculation
RE: End area calculation
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: End area calculation
RE: End area calculation
Yet I like very much old methods of calculation and design; I presently have rediscovered the way o get the square root graphically by I think Archimedes; so, the Simpson's (other Simpsons) rule look some times in the day quite modern.
RE: End area calculation
Hmm, last week I cleaned out my father's basement, and we got rid of an old Monroe hand crank adding machine. He said he used it for figuring cuts and fills. This was before the advent of digital computers.
I needed to relearn this process to insure that I wasn't just trusting the software. I needed to know that the answer the computer gave me was correct. As BigH says, it gives you a new perspective on accuracy.
I worked on a large canal project several years ago. My standard comment was that we are doing the same things the romans did, but we have computers and diesel powered equipment.
Thanks all.
RE: End area calculation
RE: End area calculation
RE: End area calculation
RE: End area calculation