3d estimation :: Earth Volumetric Studio Help

3d estimation

3d estimation performs parameter estimation using kriging and other methods to map 3D analytical data onto volumetric grids defined by the limits of the data set, or by the convex hull, rectilinear, or finite-difference grid extents of a geologic system modeled by gridding and horizons. The module provides several convenient options for pre- and post-processing input parameter values, and allows the user to consider anisotropy in the medium containing the property.

3d estimation also has the ability to create uniform fields, and allows the user to choose which data components to include in the output. Uniform fields require no geologic input and Adaptive Gridding must be turned off (otherwise the connectivity is not implicit).

The DrillGuide functionality produces a new input data file with a synthetic boring at the location of maximum uncertainty calculated from the previous kriging estimates, which can then be rerun to find the next area of highest uncertainty. There are no limits to the number of cycles that may be run.

Variogram Options:

There are three variogram options:

Spherical: the default and recommended choice for most applications
Exponential: generally gives similar results to Spherical and may be superior for some datasets
Gaussian: notoriously unstable, but can “smooth” your data with an appropriate nugget. Without a nugget term, Gaussian is generally unusable. If Gaussian kriging is overshooting the plume in various directions, the nugget is likely too small; if the plume looks overly smooth, the nugget is likely too big.

The “Power Factor” is only used for exponential or Gaussian variograms. The default value of 3 is the most common value for exponential. For Gaussian, 2 is most common, though values from 0.1 to 3 are typically acceptable.

Advanced Variography Options:

3d estimation supports complex directional anisotropic variography. The variogram is displayed as an ellipsoid that can be distorted to represent primary and secondary anisotropies and rotated to represent heading, dip, and roll. Overall scale and translation are provided as visual aids to compare the variogram to the data, though these do not affect the actual variogram.

Ports

Direction	Name	Type	Description
Input	Input Geologic Field	Field	The main geologic field input for the module.
Input	Input External Grid	Field	A field containing an external grid to use for the output. (Advanced Version Only)
Input	Input External Data	Field	A field containing external data to use instead of reading a file. (Advanced Version Only)
Input	Input Filename	String	File used to estimate analytical data.
Output	Output Filename	String	File used to estimate analytical data.
Output	Output Field	Field	The main output field with analytical data added.
Output	Status Information	String	Text containing the full status information output from the module.
Output	Output Object	Renderable	A renderable object displaying the uncertainty sphere(s) and variography created by the module. Output even when Allow Run is off.
Output	Analytical Grid Data	Realization	Information required for direct exporting of raw analytical grid data.
Output	Interpolation Options	Interpolation Options	Information about the interpolation settings such as variogram parameters and number of points used in interpolation.

Properties

Grid Settings

Property	Type	Description
Grid Coordinates	Coordinates	Defines the coordinate domain within the data set in which kriging will be completed. Min and Max values are only used when the Rectilinear option is selected.
X Resolution	Integer	The number of grid nodes in the model horizontal domain.
Y Resolution	Integer	The number of grid nodes in the model vertical domain.
Z Resolution	Integer	The number of grid nodes in the model elevation domain.
Layers From Geology	Choice: Make Single Layer, Use all Horizons	Used with the input geology port. Controls whether to create a single layer or a layer for each horizon.
Min Cells Per Layer	Integer	The minimum number of cells in the Z direction per layer. Used when proportionally gridding an input geologic grid.
Cells Per Layer	Integer	The number of cells in the Z direction per layer when not using proportional gridding.
Proportional Gridding	Choice: Cells Per Layer, Proportional Z Resolution	When multiple geologic layers exist, apportions cells to layers in Z based on each layer’s average thickness, subject to the Min Cells Per Layer parameter.
Grid Type	Choice: Uniform or Structured Field, Irregular Mesh	The type of grid to create for interpolation.
Adaptive Gridding	Boolean	Refines the grid automatically to place grid nodes at all measured data points, ensuring the output honors all measured locations exactly.
Adaptive Gridding Limit	Integer	Turns off adaptive gridding when the number of sample points exceeds this value.
Adaptive Value Priority	Choice: Favor Min Values, Favor Max Values	Specifies the criteria for which sample to use for adaptive gridding when more than one sample is contained by the same grid cell.
Minimum Layer Thickness	Double	The smallest vertical height of each cell.
Reverse Surface Hierarchy	Boolean	Defines layers starting from the bottom to the top.
Boundary Offset	Double	Creates a domain larger than the input data along all three axes.

Data Processing

Property	Type	Description
Data Processing	Choice: Linear Processing, Log Processing	Allows the module to be run in either linear or log space.
Data Scaling	Double	A value by which all nodal data values will be multiplied before kriging.
Pre Clip Min	Double	Any nodal property value less than this number will be replaced during preprocessing.
Pre Clip Max	Double	Any nodal property value greater than this number will be replaced during preprocessing.
Less Than Multiplier	Double	Applied when reading a file with values flagged with the ‘<’ character. Multiplies the file value by this multiplier.
Detection Limit	Double	Affects file values set with the ‘ND’ or other non-detect flags. The module inserts a value equal to (Detection Limit * Less Than Multiplier).
Post Clip Min	Double	The smallest nodal value that will be present in the output data field.
Post Clip Max	Double	The largest nodal value that will be present in the output data field.
Auto Exponentiate External Log Data	Boolean	Detects if data imported via the External Data port has been log processed and exponentiates it, avoiding double log processing.
External Data	Multi-select	Selects which data components from the External Data port to use for interpolation.

Time Settings

Property	Type	Description
Chem File Is Time Domain	Boolean	Causes the file to be read as a time file, with values interpolated first to the set date and then to the grid.
Specify Date By Component	Boolean	Allows the Data Component value to select a date, resulting in exact data at a date instead of an interpolated value.
Date For Interpolation	Date	The date of interest. Used with the Interpolation Type to determine the value of a sample before interpolation onto the grid.
Analyte Name	String	The analyte name for date files.
Date Interpolation Method	Choice: Direct Interpolation Only, Interpolate Only, Interpolate and Extrapolate Beyond, Interpolate and Extrapolate	Defines how to interpolate when given unsampled times in a file.
TCF File Name	File	The output TCF file name. When the module runs, it loops through each component and creates an EFB file; the dates and filenames are added to the TCF file.
Create TCF	Button	Causes the module to run in a loop, going through each component and creating an EFB file at that time. These EFB files are linked together in the specified TCF file.

Krig Settings

Property	Type	Description
Estimation Type	Choice: Kriging, IDW (Shepard), IDW (Franke/Nielson), Nearest Neighbor, FastRBF	The method for interpolating file data onto the created grid.
Reach	Double	The radial distance from any given model node that the module will look for data points. Setting to 0 causes the module to calculate a reach approximately two-thirds of the longest distance between any two data points.
Points In Reach	Integer	The maximum number of data points within the reach to consider for parameter estimation at a model node.
Octant Search	Boolean	When selected, searching is performed for each of the eight octants surrounding the point to be kriged.
Use All Points	Boolean	Causes the module to include samples up to the All Points Limit value. If the number of samples exceeds the limit, Reach and Points In Reach settings are used.
All Points Limit	Integer	The maximum number of points to use when interpolating. If there are more samples than this value, Reach and Points In Reach settings will be used.
Statistical Confidence Tolerance	Double	Specifies the interval in linear space around the kriged model estimates to which the kriging confidence or uncertainty applies.
Statistical Confidence Factor	Double	Specifies the interval in log space around the kriged model estimates to which the kriging confidence or uncertainty applies.
Min Max Confidence	Double	Specifies the interval around the kriged model estimates to which the kriging confidence or uncertainty applies.
IDW Power	Double	Used with Inverse Distance Weighting. Greater values increase the influence of values closest to the interpolated point.
Variogram And Anisotropy	Variogram	Controls the semi-variogram model and 3D anisotropy settings for kriging.

Data To Export

Property	Type	Description
Auxillary Kriging Data	Multi-select: Max Plume, Min Plume, Statistical Confidence, Standard Deviation, Statistical Uncertainty	Selects which kriging-derived data components to include in the output field on a node by node basis. Available when using Kriging estimation.
Geologic Nodal Data	Multi-select: Layer Thickness, Depth, Elevation	Selects which geologic data components to generate for the output field on a node by node basis. For structured grids, Layer Thickness is exported as cell data.
Geologic Cell Data	Multi-select: Material ID, Geo Layer	Selects which geologic data components to generate for the output field on a cell by cell basis.

Display Settings

Property	Type	Description
Uncertainty Spheres To Display	Multi-select	Selects which uncertainty spheres to display. There is one sphere per analyte, each reflecting the location of maximum uncertainty for that analyte.

Variography Display

Property	Type	Description
Display Variogram Ellipsoid	Boolean	Displays the variography ellipsoid in the viewport.
Ellipsoid Opacity	Double	Sets the opacity of the ellipsoid.
Resolution	Integer	The resolution of the ellipsoid. Larger numbers create more detailed representations.
Ellipsoid Scale	Double	Scales the ellipsoid equally along each axis.
X Offset	Double	Translates the ellipsoid along the x axis.
Y Offset	Double	Translates the ellipsoid along the y axis.
Z Offset	Double	Translates the ellipsoid along the z axis.
Ellipsoid Color	Color	The color of the variogram ellipsoid.
Display Variogram Lines	Boolean	Displays lines aligned with the variography ellipsoid.
Line Scale	Double	A scalar that sets the length of the variogram lines relative to the scale of the ellipsoid.
Primary Ratio Color	Color	The color of the primary ratio axis line.
Secondary Ratio Color	Color	The color of the secondary ratio axis line.
Tertiary Axis Color	Color	The color of the tertiary axis line.

Drill Guide

Property	Type	Description
Create DG File	Button	Runs the module in a loop, creating a synthetic boring at the maximum uncertainty location until the Number Of Synthetic Samples is reached.
Synthetic Sample Prefix	String	Allows the user to alter the prefix string for generated synthetic boring names.
Number Of Synthetic Samples	Integer	Controls how many times drill guide will run.
Boring Samples	Integer	Indicates how many samples to create at each synthetic boring.
Target Concentration	Boolean	When selected, changes the location of the uncertainty sphere based upon the specified Target Isolevel.
Target Isolevel	Double	When Target Concentration is selected, this value is used to change the location of the uncertainty sphere.
User Points	Coordinates	Manages points added to the grid for drill guide purposes to eliminate areas of high uncertainty that cannot be drilled, such as under a building.

General

Property	Type	Description
Allow Run	Boolean	Controls whether the module will run when applications are loaded or data changes. When off, the module will not run unless Execute is pressed.
Filename	File	The file containing the data to interpolate onto the created grid.
Data Component	Integer	Selects which property value in the analyte file will be kriged. The default value of -1 results in kriging of all data components in the file.
Execute	Button	Forces the module to run. If pressed and the application saved, the module will run when the application is loaded.
Z Scale	Double	The vertical exaggeration to apply to the variogram and the uncertainty sphere.