Here is a portion of a rock face located 1.8 to 2.5 km (1.1 to 1.5 mi) from the camera stations. The objective was to determine the sizes of the rock blocks on the rock face, which were used to generate rock blocks for a rockfall simulation study. In these cases, not only is it necessary to identify a sufficient number of fractures: it is necessary to digitize ALL fractures because otherwise the determination of the block size will be incorrect. This rules out the use of LiDAR because fracture traces cannot be correctly identified in LiDAR data.
Here is the depth of a detached block isolated by a bedding plane in the slope depicted in the previous figure.
This is an aerial view from Google Earth of a rock slope (in red) located in a very narrow and steep canyon. The challenge was to determine the unstable blocks and their dimensions.
Here is the model, accurate to better than 2.5 cm (1 in). Now, focus on the red rectangle (where the arrow is pointing at) to see an example of rock block dimensions.
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