Creating Grids and Maps from Lineation Data

RockWorks | ModOps | Grid | Create | Lineations -> Grid

This program is designed to read lineation data from the RockWorks Datasheet (in X1, Y1, X2, Y2 endpoint coordinate format), and create a grid file that models the lineation frequency, cumulative lengths, and/or intersections, with a variety of weighting options. The resulting grid model can be illustrated as a 2D map or 3D surface.

Feature Level: RockWorks Basic and higher

Menu Options
Step-by-Step Summary

Rules & Filters
Use the tabs at the top of the window to apply a time/date filter to data being displayed in your map layers. (More info)
XY Columns
Click this tab to define which columns in the input datasheet contain which data.
- X1, Y1: Select the names of the columns in the data sheet that contain the X and Y coordinates for the beginning points of the lineations.
  These can be Eastings in meters or feet, decimal longitudes, etc. See Defining your Datasheet Coordinates for more information.
- X2, Y2: Select the columns that contain the X,Y coordinates for the endpoints of the lines
Azimuth Filter(s)
Check this box to turn on a data filter based on azimuth bearing.
Click this tab to set up the filter parameters.
- Filter #1: To omit lineations from the computations based on their bearing, insert a check in this box. Use the prompts to establish the bearing filter range, using a minimum azimuth bearing and a maximum bearing. The program will assume this is bi-directional.
- Filter #2: To invoke a second filter, insert a check here and follow the instructions for the Filter #1, above.
  ! NOTE: The maximum azimuth must be designated in a clockwise manner from the minimum. If the desired range crosses North (bearing = 0), it is possible to enter a Minimum azimuth that is greater than the Maximum. For example: You can filter for northerly-bearing lineations ranging from a minimum of 315 to a maximum of 45.
Length Filter(s)
If you wish to exclude lineations from the computations based on their computed length, insert a check in this check-box.
Click on this tab to establish the filter range. Note that the lengths should be entered in the same units defined in the Output Dimensions.
- Minimum: Insert a check here if you wish to establish a minimum length for lineations to be included, and enter the minimum acceptable lineation length. Any line whose computed length falls below this threshold will be omitted from the computations.
- Maximum: Insert a check here if you wish to establish a maximum length for lineations to be included, and enter the maximum acceptable lineation length. Any line whose computed length is above this threshold will be omitted from the computations.
- Tip: Use the Linears | Lineation Properties tool to compute and record the length of each lineation in the datasheet.
Modeling Options
Click on this tab to set up the modeling settings.
- Output Grid: Click to the right to type in the name under which the lineation grid model is to be stored.
- Grid Type: Insert a check in the options below to select what type(s) of grid models you wish to create to represent the lineation data.
  - Frequency Grid: Insert a check here to create a lineation frequency grid, in which each grid cell represents the number of lineations that lie in the cell. This includes lines that originate in the cell, end in the cell, and simply pass through the cell.
  - Length Grid: Insert a check here if you want to create a lineation length grid, in which each cell represents the total lengths, added together, of all of the lineations that pass through the cell. (The total length of each line is included, not just the length of the portion of the line that lies within the cell.)
  - Intersection Grid: Check this option if you want to create a lineation intersection grid in which each cell represents the number of lineation intersections that occur within the cell.
- Statistical Manipulations: Use these options to establish how the numbers will be recorded in the output grid file. Choose from:
  - None: (No manipulation) Using this setting, the frequency, length, and/or intersection values will be recorded in the grid model as they were computed.
  - Normalize: With this setting, the real number frequency, length and/or intersection grid node values will be normalized to range between 0 and 1.
  - Standardize : With this setting, the program will compute the real number frequency, length, and/or intersection node values, determine the mean node value and the standard deviation, and will store all computed node values in terms of standard deviations above and below the mean.
- Weighting Factor: If you have requested more than one type of model be represented in the final grid file (e.g. you have selected more than one of the Length, Frequency, and Intersection grids), you can assign a weight or influence of each in the output model.
  How this works: The program combines the Length, Frequency, and/or Intersection grids into the final model simply by adding them together. If you set the weighting factor to a number other than "1," the nodes in the intermediate grids will be multiplied by that value before being combined with the other intermediate grids.
  A weighting factor of "1" means the intermediate grid will be combined as-is with the other intermediate grids (regardless of the statistical manipulation requested). A weighting factor of "0.5" means the nodes of the intermediate grid will be halved in value before being combined with the other intermediate grids. A weighting factor of "2" means the nodes of the intermediate grid will be doubled in value before being combined with the other intermediate grids.
2D Grid Map
Check this box to display the output grid as a 2D map at this time.
Click this tab to set up the 2D map layers (bitmap, symbols, labels, line contours, color-filled contours, labeled cells, map border, etc.).
- Output Options: Use these settings to define whether the output graphic is to be saved (or displayed as "untitled"), how the file should be named, and whether it is to be displayed after it is created. It also offers export options. (More info)
Tip: Include the lineation map layer with this grid map using the Map Overlays | Lineations layer.
3D Grid Diagram
Check this box to display the output grid as a 3D surface at this time.
Click this tab to set up the 3D map layers (surface colors, images, reference cage, etc.).
! You can request both a 2D and 3D representation of the grid model.
! Bear in mind that the grids output from this program don't represent elevation. If you want to include a reference cage in the 3D scene, you'll need to set the cage dimensions to Automatic rather than to comply with the Output Dimensions.
- Output Options: Use these settings to define whether the output scene is to be saved (or displayed as "untitled"), how the file should be named, and whether it is to be displayed after it is created. It also offers export options. (More info)

Access the RockWorks Datasheet program tab.
Create a new datasheet and enter/import your line endpoint data (X1Y1X2Y2) into the datasheet.
Or, open one of the sample files and replace that data with your own. See Data Layout for datasheet examples.
! Click the Example button at the top of the window to load a sample file that is installed with the program.
Select the ModOps | Grid | Create | Lineations - Grid menu option.
Enter the requested menu items, described above.
Click the Continue button to proceed.
The program will read the measurements from the data sheet. It will create the requested lineation grid model(s), weighting and combining them if multiple models were selected, storing the resulting numeric grid file on disk if you so requested. If you have requested a diagram, it will be created and displayed on the screen.
You can adjust any of the gridding and diagram settings via the Options tab to the left, and click the Continue button again to regenerate the model and/or map.
View / save / manipulate / export / print the diagram in the RockPlot2D or RockPlot3D window.

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