Ignore the title - I started this post differently than it ended up...
Should be titled something like "Double Checking Volume Estimates"
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I have a stockpile of 2" Minus that's been sitting for SEVERAL years - it has trees growing out of it - that I've flown 2 missions over. The stockpile has most certainly settled during the time it's sat there, and now that we're loading trucks out of it the pile is getting loosened and broken up ("fluffed" if you will).
I'm not very confident comparing the two volumetric estimates. I have an exact tonnage hauled from the time the first mission was flown until I flew the second - the difference between the first estimate and the second is 1,762 tons less than what has actually been hauled.
How can I double check my results in order to have a reasonable amount of confidence in the results?
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I am not exactly sure what you are asking here. Yes, the second is smaller. Some has been removed. And it has settled.
You have plenty of points to define your measurement polygon.
It looks pretty good. What exactly is the issue?
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The issue is that the difference in those two estimates is ~1,700 tons less than what has actually been hauled from the stockpile. That's a 6.1% difference between estimated stockpile volume decrease and actual stockpile volume decrease.
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The volume (not weight in tons) goes from from 19185 to 14257. This is a 25.7% reduction in volume. Remember it is going by volume, not weight. If you have 'fluffed' it or it has settled the density sounds quite different. How you account for this compaction and fluffing is up to you but measured volume is measure volume.
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