If I had an stereo par from Worldview-2 or GeoEye-1, how precise would be the calculation of mine's materials in cm3?
1 Answer
I have seen providers state accuracies around 20cm between two subsequent elevation datasets covering the same mine. Such accuracies require a significant number of calibration points from the site, and it is likely that it is dependent on the methodological approach to the retrievals.
As such, with a best case (or atleast something that providers state in their promotional material) scenario, the expected error is around 200 000 cm3 per m2.
answered Mar 8, 2018 at 21:31
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Is there a formula to determine the accuracy and errors determined from the image resolution? example: I have a 40cm image, how can I calculate the accuracy and the error of that image?– ThriskelMar 8, 2018 at 21:41
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@Thriskel - no. It depends on how accurately you retrieved elevation from the data. If you do not have enough ground truth to do a statistical evaluation, you will have no information to help you estimate the accuracy of the data that you have derived and thus, the accuracy of any volumetric measurements. Mar 8, 2018 at 21:44
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I'm understanding that if I have a 10cm DSM, I'll obtain a 10cm accuracy in the volumetric measurement, is that right?– ThriskelMar 8, 2018 at 21:52
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@Thriskel - not really. The vertical (Z) accuracy of the DSM is not necessarily related to the spatial (X & Y) resolution. Mar 9, 2018 at 12:42
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@Mikkel_Lydholm_Rasmussen if I had 10 cm of vertical (Z) accuracy of the DSM, would I obtain 10cm accuracy in the volumetric measurement?– ThriskelMar 9, 2018 at 13:29