Drillhole Settings

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Drillhole Settings

Summary

The Drillhole Settings options in the backstage area allow you to change various import related settings for drillhole datasets.

Usage

To open Drillhole Settings, follow these steps:

From an open project, click the Project tab on the ribbon. Alternatively, on the ArcGIS Pro start page, click the Settings button in the lower left corner of the page.
In the list of menu items on the left, click Drillhole Settings.

Here you can change the conversion of negative values option, the desurveying method, the survey data dip direction, the desurvey resolution and the depth tick interval, to use when importing new drillhole data. For an existing drillhole dataset, you can change the desurveying method, the survey data dip direction, the desurvey resolution and the depth tick interval, and the changes will be applied to that dataset.

Parameters

Parameter	Explanation
Default Settings
Convert negative values on import	Determines if assay negative values are automatically converted on import. See Technical Notes below for more information on "negative" assay values and how they are converted.
Desurvey method	Determines what mathematical process should be used to convert a series of measurements of dip and azimuth taken at depths down a borehole, into (X, Y, Z) coordinates. Radius of curvature: synthesizes the trace as a collection of circular segments, each starting and ending at a single (dip, azimuth, depth) location. Straight segments: uses straight line segments to describe the location of the hole trace. Used primarily for trenches, or near vertical holes.
Negative survey dips point	This determines if the holes survey dips are negative downward or positive downward: Down: negative survey dips means holes point downward Up: positive survey dips means holes point downward This convention is applied at plotting time, so if all your holes go “up” instead of “down”, change this convention to correct things.
Resolution	The import process calculates the hole location at a spacing determined by this interval. The interval also determines the accuracy of intersection and cut-off points, such as when a hole leaves or enters the current view "slice", and also averaging functions used when plotting graphs of data down the holes.
Depth tick interval	The spacing interval (in ground units) at which ticks are plotted, is determined by this parameter. The depth tick interval must be greater than the resolution interval value.
Change Settings for Existing Drillhole Datasets
Desurvey method	Determines what mathematical process should be used to convert a series of measurements of dip and azimuth taken at depths down a borehole, into (X, Y, Z) coordinates. Radius of curvature: synthesizes the trace as a collection of circular segments, each starting and ending at a single (dip, azimuth, depth) location. Straight segments: uses straight line segments to describe the location of the hole trace. Used primarily for trenches, or near vertical holes.
Negative survey dips point	This determines if the holes survey dips are negative downward or positive downward: Down: negative survey dips means holes point downward Up: positive survey dips means holes point downward This convention is applied at plotting time, so if all your holes go “up” instead of “down”, change this convention to correct things.
Resolution	The resurveying process calculates the hole location at a spacing determined by this interval. The interval also determines the accuracy of intersection and cut-off points, such as when a hole leaves or enters the current view "slice", and also averaging functions used when plotting graphs of data down the holes.
Depth tick interval	The spacing interval (in ground units) at which ticks are plotted, is determined by this parameter. The depth tick interval must be greater than the resolution interval value.

Technical Notes:

"Negative" assays:

Assay values are measured geochemical concentrations of elemental abundance in a rock, or other geological samples (soil, water, drillcore, rock sample). When assay values are measured in the lab, sometimes the amount of an element present is very small, making it too little, or too low to be accurately detected by the method which is used to measure the concentration. This results in assay measurements that are reported using a "lower detection limit" value, which is often reported as a negative value (or using a less than '<' sign), such as "-0.01". On import, you can choose to automatically convert these negatives (or < signs) to a value 1/2 that of the numeric value used.