stockpile measurments

PIX4Dmapper
1

Hello everyone
we have a project for stockpile measurements for a land with area equal=0.1 km2
we will photographed it weekly
the question is how can I measure the difference volume between two surface and what is the accuracy for this volume?

Thanks

2

Hi suhaib,
There are a couple different methods to set your base surface. The article below describes the different vector based surfaces.

However if your base surface is a raster then you will want to look at a 3rd party software such as QGIS or ArcGIS to run the calcuations.

As for accuracy, this will come down to your ground sampling distance. Generally, the expected accuracy of a correctly reconstructed and precisely georeferenced project is:

1-2 x GSD horizontally (X,Y coordinates).
1-3 x GSD vertically (Z coordinate).

3

Thanks Mike
if my GSD=3cm what is that means in volume accuracy?

4

Generally 3cm GSD is very good. If you are measuring a large stockpile then the error will be very minimal. If you are measuring something that is very small then the error will be greater. How big is your stockpile?

5

Hello mike
we will photograph the area weekly, so there is a small amount in first photographs I don’t know what is the amount but lets say if its volume about .5 million cubic meter what is the accuracy for this?, and I have another question there is any difference if we use GCPs in calculations?

6

Hi suhaib,
Many top mining companies claim that by applying the photogrammetry workflow with Pix4Dmapper, they can achieve measurement accuracies of around 2-5% for their stockpile volumes. This would include the use of GCPs as it will keep both your absolute and relative accuracies as high as possible. I have also attached a PDF that describes how mining companies are using PIX4D for stockpile measurements. I believe this could be helpful for you.
BLOG_drone-mining-stockpile-volume-pix4dmapper.pdf (475.7 KB)