04 Layer models and cross sections

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Last updated: Sept 11, 2012Version comment
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Layer models and cross section.

A layer model is a collection into a layer folder of grids which have the same grid position and resolution. The layer folder is of type Generic and has the Schema Layer model.

Exercise

Create a layer model.

  1. Create a generic folder and set the schema to Layer Model.
  2. Copy all time grids into this folder and secure the correct ordering from top to bottom by placing a prefix number 01 02 03 ... etc.
  3. Perform Zoom to Folder on the time layer model and draw the window frame and axes.
  4. Display all the layers in random colors.
  5. Create a map command that display the color using color range from 1000 to 4200.

A layer model consisting of interpretation grids may have grids that go deeper that the next grid in sequence. We then have to check the layer model and if necessary do truncation.

Exercise

Check and truncate the layer model.

  1. Visualize the layers one by one to see if there is any overlap.
  2. Activate upon the layer model the command Check and truncate layers from top and downwards.
  3. We run on defaults; therefore click on Execute to perform truncation from top and downwards.


Layers mapped with the same color range

Having a layer model it is convenient to make cross sections.

Exercise

Create cross sections.

  1. Highlight layer model folder and read the command Information about the layer model.
  2. Activate the command Initialize the layer model into Workspace. The layer model grids are read into workspace for fast retrieval.

    Layer model grids

    • When the layer model grids are in workspace it is quick to perform cross sections and other calculation.
    • If a another layer model shall be studied just activate Initialize the layer model into Workspace on the new layer model.
    • Cross sections will be performed on the layer models grids in workspace.
  3. Create a new Generic folder and give it the name Cross sections and set the schema to Cross sections. Cross section commands will now be visible on this folder.
  4. Do on the cross section folder Display fence type cross section. It will display and the fence data is saved in the cross section folder.
  5. Erase the screen and open the cross section folder perform on the fence data Vertical redisplay from cross section data.
  6. Activate on the cross section folder Legend for cross section.
  7. Try the other cross section commands.

    Setting cursor for cross section action

    • When doing cross sections it is smart to have the bottom layer displayed.
    • Place a cursor position on the bottom layer using key letter y when in 3D mode, or just click when in 2D mode.
    • Cross section between two cursor points: Set two cursor marks. Geocap remember them even if only the latest is shown.


Cross section study of the time layer model

Another option for fast cross sections is to generate a solid layer cube.

Exercise

Create a layer cube.

  1. Use Zoom to Folder on the layer model to get the overall layer window.
  2. Highlight layer model folder and activate the command Cube generation of all layers.
  3. Click Use Active Window to set the cube window.
  4. Set the cube grid increments to 500 500 20 to get 282 x 190 x 20 grid nodes.
  5. Click Execute. The cube is saved in workspace cubegrid.
  6. Get the cube gid into the project under the Time folder and rename the cube to time_cubegrid.
  7. Apply the Manipulator to display the layers in the cube in a fast way in all directions.

    Setting cursor for cross section action

    • The manipulator is for a cube is activated by cube > Utilities > Manipulator cube display.
  8. Run the manipulator in all directions on the cube.
  9. Display a layer grid to verify that the cross sections from the cube have correct extensions.


Cross sections displayed from a layer cube