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Desurveying converts downhole survey measurements into 3D spatial coordinates along the drillhole path. This is critical for accurate subsurface modeling and resource estimation.
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Desurveying converts downhole survey measurements into 3D spatial coordinates along the drillhole path.
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### **Assumptions**
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### Assumptions
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***Azimuth**: Angle measured clockwise from **true north** (degrees).
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***Dip**: Angle from **horizontal**, where **negative values indicate downward inclination**.
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***Depth**: Measured along the drillhole from the collar.
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### **Methods**
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### Methods
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***Minimum Curvature**
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Applied when more than two survey points exist. This method assumes a smooth arc between points, minimizing deviation from true curvature.
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***Tangent Method**
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Used when only two points exist (collar and one survey), assuming a straight line between them.
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### **Resampling**
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### Resampling
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Drillhole paths can be resampled into smaller intervals for modelling or interpolation.
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* Loopresources uses **Slerp (Spherical Linear Interpolation)** to interpolate orientations smoothly between survey points, preserving directional accuracy.
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* Loopresources uses **Slerp (Spherical Linear Interpolation)** to interpolate orientations smoothly between survey points, preserving directional accuracy and then performs minimum curvature desurveying on these interpolated points.
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***
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Would you like me to **extend this with a code snippet showing how to call your desurvey function**, or **add a diagram illustrating azimuth/dip conventions and curvature vs tangent paths**?
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### Mapping properties
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LoopResouces allows mapping of additional properties (e.g., lithology, assay, structure) along the drillhole path during desurveying. This can either be done by desurveying the
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mid point of each interval, or the to and from depths of each interval. Or by resampling the property
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