Is there any special layout for targets when performing stockpile volume determinations? My thought is to treat it like any other UAS project, but have more targets around the base of the stockpile(s). Since I can't climb on the stockpile to obtain check points, how do I verify the results? Would a reflectorless total station be able to get points on the stockpile?
I have a DJI Phantom 4 Pro and would fly a double grid pattern at ~180ft. Use RTK to survey the targets. Record static on the base and process through OPUS. Use TBC to correct the rover shots. Pix4d to process the imagery and produce the 3D model. Esri ArcMap for the volume calculations.
andrewm, post: 435099, member: 10888 wrote: Would a reflectorless total station be able to get points on the stockpile?
Yep. That was my primary method of measurement back when I did these.
Reflectorless should be able to get a reasonable number of random positions - doesn't actually matter where they are since they are just check points. More importantly and something often overlooked/not understood by many of the organisations which claim to do stockpile volumes is the base model. Unless you know the shape and heights of the base surface before the heap was built then the top model accuracy is irrelevant.
I've seen "iceberg" heaps, where one party was claiming a volume several times greater than the "survey" : on investigation the heaps were found to be located over an old excavated area.
chris mills, post: 435162, member: 6244 wrote: Reflectorless should be able to get a reasonable number of random positions - doesn't actually matter where they are since they are just check points. More importantly and something often overlooked/not understood by many of the organisations which claim to do stockpile volumes is the base model. Unless you know the shape and heights of the base surface before the heap was built then the top model accuracy is irrelevant.
I've seen "iceberg" heaps, where one party was claiming a volume several times greater than the "survey" : on investigation the heaps were found to be located over an old excavated area.
I was always told the pile was placed on a perfectly flat surface,,,,,,,every time,,,,,it's amazing;)