A common occurrence at GIX Consulting is finding and assessing mine shafts from the use of satellite imagery, satellite LiDAR surveys and advanced GIS techniques.
Used in tandem with geotechnical projects, this can provide a invaluable amount of data analysis, which was previously too difficult to determine using conventional methods.
The pictures below show a rare example of a singular mine shaft to the West, which has already started to influence the surrounding topography, adjacent to two mine shafts to the East, which are yet to cause ground stability.
Previously, tree cover has meant that these mine shafts were concealed and unable to be assessed. Now, with the 2017 national LiDAR programme in conjunction with QGIS and GIX Consulting's advanced GIS knowledge, these can mapped accurately and assessed to determine their influence on the surrounding area.
Both the top left image and top right image illustrate how such mine shafts can mapped and catalogued, given the located area to mine shaft grid reference, and zone of influence. The bottom right image shows a more advanced technique and the capabilities of QGIS; this is the calculated slope angle (symbolised with a magma colour ramp).
However, this is only showing one iteration of the area and at only 1m resolution. GIX Consulting will able to take this data even further, and provide even higher resolution of LiDAR imagery, with multiple images showing the change of slope angle over time.
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