interpreting valuation map data?

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interpreting valuation map data?

Postby MSD » Fri Feb 03, 2017 4:55 pm

I'm trying to understand the unit of measure for vertical alignment (elevation) dimensions found on valuation maps to aide in a possible model layout. For example, a map has two of the stations labeled as 394 & 395, and at station 394 it has 0.19 in the vertical alignment slot and station 395 has 0.57 for the vertical alignment. The Vertical Alignment - Max Elevation for the branch is 683.00 and the Minimum Elevation for the branch is 633.0. So, what is the height of stations 394 & 395 in like feet?
MSD
 
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Re: interpreting valuation map data?

Postby TrainDetainer » Tue Feb 14, 2017 6:28 pm

Are you sure the 394 and 395 are stations, not mile posts? Without seeing the print I can't say, but if they're mile posts the vertical values are probably percent of delta total - in your case 683 - 633 = 50' total, so elevation at 394 would be 633' + (50' x .19) = 642.5' and 395 would be 633' +(50' x .57) = 661.5', so you're gaining 19' in a mile or .36% grade. If they really are 100' stations, there should be elevation/topo markers that would likely make the 'slot' numbers additives following a whole marker, like 635' + (12" x .19) = 635' 2.28" and 635' + (12" x .57) = 635' 6.84", so you're gaining 4.56" in 100' or .38% grade.
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Re: interpreting valuation map data?

Postby MSD » Wed Feb 15, 2017 9:55 am

Your right; they are mile posts not stations. These valuations maps are rather confusing at times. Thank you for detailed explanations on how these things are calculated.
MSD
 
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