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The following steps are taken to determine the Dominant Colour of a row image.
Take the output of the fracture detection model, “simple” classes only
Run a segmentation model to extract the fracture profile (or skeleton)
Determine its angle and curvature
For a given 3m interval, plot each measurement of angle and curvature on the plot shown below
Create 45° bins for fracture angles, slide left/right to minimise number of bins
If there are three or more fractures in a bin, a set is assigned. Other fractures are designated random.
Combine the measured values of each fracture with “complex” fracture detections as per the flowchart below.
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Number of Sets
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Random Joints Present?
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Description
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Jn
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0
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No
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No joints
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0.5
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0
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Yes
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Random joints
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1.0
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1
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No
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One set
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2.0
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1
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Yes
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One set + random
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3.0
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2
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No
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Two sets
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4.0
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2
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Yes
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Two sets + random
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6.0
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3
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No
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Three sets
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9.0
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3
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Yes
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Three sets + random
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12.0
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4
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No
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>4 sets - heavily jointed
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15.0
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5
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No
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Crushed rock
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20.0
Product Configuration Options
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Configuration
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Options
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t_1 threshold (see flowchart above)
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Threshold can be set to any value.
Default value is 30%
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t_2 threshold (see flowchart above)
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Threshold can be set to any value.
Default value is 20%
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t_3 threshold (see flowchart above)
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Threshold can be set to any value.
Default value is 10%
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t_4 threshold (see flowchart above)
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Threshold can be set to any value.
Default value is 0%
Output Intervals
Default interval length: 3.0m
Customisable interval available: No
User Data
User data may be uploaded to the platform via csv in the following format:
· HoleID_sampling_intervals_joint_sets.csv
CSV file to contain the following headers:
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File Header
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Description
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depth_from
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Start of interval
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depth_to
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End of interval
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jn
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Joint Set Number logged on site. This is an optional field.
The dominant colour is calculated by assessing every pixel in the image and determining the most significant colour.
This provides a single colour output (R,G,B and Hex) that allows for a simple colour representation of the borehole and is particularly useful output that most 3D modelling packages can handle.
Product Configuration Options
There are no configuration aspects to this product.
Output Intervals
Data intervals are based on the calculated depth of each row image.
User Data
Not currently able to upload to the platform.
Data Output
Results from this product is delivered in a batch nature.
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The available CSV files include the following:
ProjectID_Joint_Set_Analysis_3mDominant_Colour.csv
File Header | Description |
hole_id | Customer’s Hole ID |
depth_from | Start of interval |
depth_to | End of interval |
jn | Joint Set Number as defined in the Q-System |
jn_description | Joint Set Number description as defined in the Q-System |
timestamp | Time of joint set calculations |
version | A model version identifier |
R | |
G | |
B | |
hex |
Product Limitations
Limitations | Comments |
Measurements are taken on simple, single interface fractures only. | This method is based on measurements of simple, single interface fractures, and assumed parameters for broken zones. It is recommended that these assumptions be verified based on customer’s logging schema. |
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Version | Date | Author | Rationale | |
1 | 6 Sep 2022 | S Johnson | Initial release | |
2 | 9 Mar 2023 | S Johnson | Updated with Jn table | |
3 | 18 July 2023 | S Johnson | Updated for custom intervals | |