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Getting started with RayGUI

Four basic examples

You should be somewhat familiar with rayinvr. If not, it is best to start with the examples in ...raygui/rayinvr/package/example. RayGUI is merely an interface to rayinvr.

Layer numbering: Layer 0 is the top of the model. Layer 1 is the first layer within the model, e.g., the water column. Reflection at layer 1 means the reflection at the base of layer 1, e.g., at the seafloor. Headwave at layer 1 is also at the base of layer 1, i.e., in reality at the top of layer 2.

Setting up a new project: It helps to start with some esisting "master" files. Examples 1 and 2 contain some robust input files for further work.

Start with an existing rayinvr model, ex1

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Build a velocity model from scratch, ex2

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Start inversion, ex3

This hasn't been tested very well. RayGUI is not designed to generate input for the inversion with dmplstsqr. You'll have to edit for this.

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Layer pinch-outs, ex4

Pinch-outs are a little bit tedious... If everything else fails, text-edit the ray_window velocity model.

Files: v1.ray - model to play with - traveltime picks (irrelevant for this example) - ray tracing parameters. Should be compatible with v1.ray

Pinch-out to top, duplicate layer: To add another layer that pinches out without reading any external x/z-picks.

Pinch-out to top, read x/z-picks:

Pinch-out to base, duplicate layer:

Pinch-out to base, read x-z picks: This is tricky and involves text-editing

In general, keep in mind that pinch-outs are layers with zero-thickness (e.g., for ray parameters, etc.). Fix with a text-editor if you have accidentially moved a structural point in a region where a layer is supposed to have zero-thickness.

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Questions and comments?
Last revised Apr. 11, 2002