vmed edit mode

ON-SCREEN PERMANENT BUTTONS:

NOTE: insertion point is a small triangle. Besides typing in file name you can:
-ctrl-x deletes the entire string
-ctrl-z changes the string back to it''s initial value
-ctrl-a moves insertion point to beginning of string
-ctrl-e moves insertion point to end of string
-ctrl-f moves insertion point one point to the right
-ctrl-b moves insertion point one point to the left
-ctrl-k deletes everything to the right of the insertion point
-backspace or del deletes character to the left
-carriage return signals editing of string is complete.
NOTE: [ctrl-s] automatically moves cursor position to the filename box.

TOP LEFT: [load] button Loads the specified filename

TOP RIGHT: [save] button Saves the file to the specified filename. Alternatively, could type in [W] to automatically save file.

TOP BUTTON TO RIGHT OF MODEL: [MODE ALL/1] button Click to select MODE 1 or MODE ALL:

MODE ALL: (1) when moving a boundary node, if there are nodes at the same location on other layers, all nodes will be moved; (2) when moving an upper velocity node, if there is a lower velocity node at the same x-location, both nodes will be moved; (3) when adding a boundary node, if there are other boundaries at the same location as the position for the new node, a new node will be added to all layers at this location
MODE 1: only the selected node is moved

LOWER BUTTON TO RIGHT OF MODEL: constraint mode: Relevant only when editing boundary nodes. Clicking on this button toggles between three settings:

1) Free: when moving a boundary node the node can be place anywhere (between the next node to the left and right).
2) Vertical: movement of boundary node is only in the vertical direction
3) Horizontal: movement of boundary node is ALONG the boundary. NOTE: can also toggle this button typing [m] anywhere.

MOUSE BUTTONS:

NOTE: only one node at a time can be selected. Or all nodes can be selected by pressing [ctrl-a] (see below for [ctrl-a] instructions. When a single node is selected, 3 buttons appear which allow you to enter the X coordinate, depth (or velocity value), and inversion switch setting. Use the [Tab] to automatically cycle the cursor position from the current position, to buttons 1, 2 and 3, then back to the original position.

[RIGHT] When a node is displayed use the right button to move it. When all boundary nodes are displayed use the right button to move (up or down) the entire boundary

KEYBOARD KEYS:

NOTE: the screen can get a bit ""messy"" (or, for e.g., part of a boundary may seem to disappear) because of the way the graphics for this program works. This is not a serious problem: Hitting the [spacebar] will clean it up.

[b] toggles plotting of vertical model [b]oundaries. Note vertical model boundaries are not automatically updated after moving nodes etc. Hit to redraw screen.

[C] plots (1) velocity [C]ontrast across each boundary; and (2) dip of each boundary in a separate panel below main plot

[d] for [d]own: to select next lowest layer

[e] to exit from [e]dit mode (modifications are not saved)

[i] writes out detailed block [i]nformation

[L] leaves edit mode (modifications not saved) and reports and plots (1) [l]ow-velocity zones; (2) negative vertical velocity gradients; and (3) crossing boundaries

[m] toggles boundary node [m]ovement constraint mode

[n] toggles plotting boundary (depth) [n]odes

[o] zooms [o]ut by 100% (if currently zoomed in)

[p] to create a [p]inch out:

CREATING APINCH OUT:
After pressing p, 4 buttons will appear:
1 = X1 is the left side of the pinchout
2 = X2 is the right side of the pinchout
3= up/down = to create a pinch up or down
4 =Pinchout: press this button or hit the [spacebar] to perform the pinchout.
The part of the boundary to be pinched out is drawn in grey. Alternatively click the left mouse button and drag a box (vertical extent of box ignored) to select part of boundary to be pinched.
Hit [Esc] or [p] at any point to cancel pinchout mode.
Use the [Tab] to automatically cycle the cursor position from the current position, to buttons 1, 2 and 3, then back to the original cursor position.

[r] [r]eloads the previously saved version of file specified at the top

[s] change vertical [s]cale of plot: Bottom of plot will change to location of cursor when [s] is pressed

[T] toggles on/off [T]itle (filename, vertical exaggeration, and date) at bottom of plot

[t] display vertical [t]wo-way traveltime at location of cursor in the top left info box

[u] for [u]p: to select next highest layer

[v] toggles plotting of lower [v]elocity nodes

[V] toggles plotting of upper [V]elocity nodes

[x] to modify the [x]-limits of the model:

MODIFYING X LIMITS: After pressing p, 4 buttons will appear:
1 = X1 is the new left side of model
2 = X2 is the new right side of model NOTE: X1 and X2 are relative to current model
3 = X0 is distance to be assigned new left left side of model.
4 = X limits : press this button or hit the [spacebar] to perform the change of X limits
Alternatively, to select a sub-region of the current model, click the left mouse button and drag a box (vertical extent of box ignored) to select X limits.
Hit [Esc] or [x] at any point to cancel X-limits mode.
Use the [Tab] to automatically cycle the cursor position from the current position, to buttons 1, 2 and 3, then back to the original cursor position.

[Z] Maximum depth of plot is set to depth at the cursor location when [Z] is pressed

[ctrl-a] if nodes are displayed (either boundary, upper velocity, lower velocity, or both upper and lower velocity nodes), [ctrl-a] will select all nodes:

EDITING WHEN ALL NODES SELECTED:
After pressing [ctrl-a], 3 buttons will appear: If all BOUNDARY nodes for a layer are selected these buttons are:
1 = Z = set depth of all nodes to this value
2 = dZ = shift all nodes up/down by this value (positive shifts down, negative up)
3 = 1/0/-1 = press this to set inversion switch of all nodes to 1, 0 or -1
If all VELOCITY nodes for a layer are selected:
1 = V1/V2/V = set velocity for all selected nodes (V1 indicates upper velocity nodes; V2 indicates lower velocity nodes; and V indicates both upper and lower nodes.
2 = dV = increase or decrease velocity at all nodes by this amount.
3 = 1/0/-1 = press this to set inversion switch of all nodes to 1, 0 or -1
NOTE: cannot set all nodes to for upper velocity nodes, or if both upper and lower nodes are selected. Use the [Tab] to automatically cycle the cursor position from the current position, to buttons 1, 2 and 3, then back to the original cursor position.

[ctrl-n] If nodes are displayed, a new node will be created (subject to movement constraints for boundary nodes)

[ctrl-n] If no nodes are selected [ctrl-n] specifies creation of a new layer. The new layer number is determined by the location of the cursor when [ctrl-n] is pressed. If cursor is above or below the model then a new layer number 1 or nlayer+1 will be created, where nlayer is the current number of model layers:

CREATING A NEW LAYER:
After pressing [ctrl-n], use left mouse button to enter new points for the layer. Points must be entered left to right. For a layer with a single point, click to the right of the model.
Click to the left of the model to add a boundary node At Xmin. If the first click is in the middle of the model, a node will automatically be created at the same depth at Xmin. The final node is entered by clicking to the right of the model, OR, at any time by clicking the right button which will automatically place a final node at Xmax at the depth of the previous node.

[ctrl-s] moves cursor to the filename box

[ctrl-x] if nodes are displayed (but not all selected), the node closest to the cursor will be deleted. If no nodes are displayed, or all nodes are selected, layer is deleted.

[-] when nodes are displayed, pressing [1] near a node will change the inversion switch setting to -1

[0] when nodes are displayed, pressing [1] near a node will change the inversion switch setting to 0

[1] when nodes are displayed, pressing [1] near a node will change the inversion switch setting to 1

[)] changes inversion switch settings for all nodes in ALL layers of the currently displayed node type to 0

[*] toggles plotting of shot point locations

[backspace] or [del] - same as [ctrl-x]

[#] crude display of velocity values, when nodes are displayed

[?] displays this help

[Esc] (1) Deselect a selected node; (2) hide nodes if no node is selected.

HOW THE ON-SCREEN BUTTONS WORK:
For non-numerical buttons (except the file name button at the top), clicking with any mouse button will either perform the button function or toggle the setting of the button. For buttons with numerical values, place the cursor in the button, then begin typing in the desired value. When finished, type in [enter] (carriage return). You CANNOT do anything else until you hit [enter]. If the first part of the number you enter starts with a "-" or a "." or "-." you won't see the "-" or "." until you type in the first actual number. Yes, it is crude.

vmed main. non-edit mode.