I have just run a pretty big 3D modelisation of an area near my house and while I run some volume calculations on it, I get very strange results such as negative calculated volumes.
Sorry to hear you are experiencing issues. Please try using a lot more points to define your measurement polygon. 20-30 points will give us a good dynamic base with which we can do the calculations. Simply dropping 3 or 4 points will not likely work out well as you have found.
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I have made more calculation on the same surface. I even tested a perfect triangular shape : a squared surface at the base with a constant slope. The result I get is extremely strange :
This is however a recurring issue. I have run into the same pitfall for much larger areas.
Here is my last experiment :
Calculated Volume: -91,404.79 m³
Void Volume: 235,169.49 m³
Minimum Height: 107.98 m
Maximum Height: 131.23 m
Area of Measurement: 18139.59 m²
The number of point is on top of that quite large as the output is 16618 x 25993 @ 3.7 cm/pixel
Anything special I need to do?
