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BjornNyberg / NetworkGT

The NetworkGT (Network Geometry and Topology) Toolbox is a set of tools designed for the geometrical and topological analysis of fracture networks.
GNU General Public License v3.0
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Roadside outcrop #18

Closed MaryiR closed 2 years ago

MaryiR commented 2 years ago

Hi! I would like to know if it is possible to use Networkgt to analyze vertical outcrops. because when I put a photograph into qgis, it will assume it is in map view and the orientation and length of the fractures would be wrong. is there a way to scale the photographs and be able to use the p20 and p21 calculations for this type of outcrops?

thanks,

BjornNyberg commented 2 years ago

Hi @MaryiR

This is possible by taking the unreferenced image from the outcrop and georeferencing the image to a map view. For instance, if you know that the outcrop image is 1x1m, then georeference the image to some point in space using a projected coordinate system (e.g., UTM). Each corner of the image is chosen with exactly 1 meter apart. The orientation or dip of the Fractures will be relative to North.

Keep in mind that most outcrop images are 2.5D representations. If this is the case, I would recommend interpreting the fracture network in a 2.5D space (e.g., Lime) and projecting the interpretations onto a 2D plane before interpreting in QGIS. However, if the outcrop is relatively 2D it would be fine to directly import the outcrop images into QGIS.

MaryiR commented 2 years ago

Thank you Nyberg.