Elevations outside profile limits

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Elevations outside profile limits

Postby Geo650Robot » Mon Dec 14, 2009 6:20 am

Hello Carlson

I have switched from another data soft on a Husky FS3
and am currently studying the operation of SCE 2.30.60

Offset staking looked like a good starting point to try some
desk top bench survey with the robot ( gps does not work
well under the office roof)

As a test case the H alignment started at 120.10
H alignment end at 270.20

profile started at 200.00
profile ended at 400.00



I inputted into Check Sta field of Input-edit profile screen
a stn of 160 to be outside the profile limits
output was hoped to be plank of type XX.XX
as a indication of no profile data available

unfortunately a El:-0.800
stn 170 outputted a El:-0.600

it seems that the profile is being extended outside the
defined vert profile limits

for example stn 199.9 generated a elevation -0.02
In the live screen of offset stake Z:-0.02
Note stn 200.00 Z=0.00

Is it possible to clear Z: if no profile Z info is available ?
in both check sta and live screen of offset stake

As a example another test profile limits
XX.XX
Start stn 200
stop stn 400
XX.XX
restart stn 500
end stn 550
XX.XX

Thanks

Peter K
Surv CE 2.30.60
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Geo650Robot
 
Posts: 1
Joined: Mon Dec 14, 2009 5:07 am
Location: BC Canada

Great care in H+V alignment entry required

Postby sfd-surveytech » Tue Mar 15, 2011 5:28 pm

Not so much an answer but to share my experience....

I too have been caught by surprise when my veritical alignment gave me an unexpected (and incorrect) 'result' when staking a centerline.

I defined one veritcal alignment to start after my horizontal alignment - at stn 0+10. (because that is where that actual 'road' was starting, but the horizontal alignment started at zero which was the intersection of the existing road and new road).

When I went to stake to the beginning of the C/L of the road, the horizontal was good but the veritical result told me I had to cut 200mm!Since this was existing road which was not to be altered, thats when I discovered that the vertical alignment was extended from the last defined station to point I was staking at same grade as the as the last VPI to the last vertical station.

Being new to construction surveying, I am not sure what situation would occur where you would have horizontal alignment data that didn't have matching vertical alignment data by station. Only one circumstance that I could imagine is if you had the entire horizontal alignment of a road section and only veritical data for the pieces being rebuilt. Please inform me of the circumstances where you would have alignment data as your example shows.

At any rate, based on my limited but tried and true experiences, I would strongly suggest ensuring that your vertial alignment stationing matches the horizontal alignment stationing as far as the starting and ending stations go. And, perform all the checks that you can on your alignnement entries as you can to make sure they are according to plan! (This is a message to other newbies :) )

Hope this is helpful.
sfd-surveytech
 
Posts: 15
Joined: Fri Feb 11, 2011 3:45 am
Location: Huntsville, Ontario


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