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No macro or processor named 'EVAToc' found

EVA ToolBar

The EVA ToolBar is used to control almost all aspects of the images produced by EVA. If you are working with plots then there is no toolbar and you should use the controls in the plot window.

If you are working with map or vertical data, then you will be using the toolbar. The only functions that do not use the toolbar are the following:

• Map title, subtitle, and colorbar title are modified by clicking directly on the title in the map window.
• The contextual menu in the map window

Variable Control Section

The top section of the toolbar lets you choose 3 image types: Grid, Contour, and Vector. You can also select any of the variables and times in this file (rather than going back to the data browser). Finally, you can also choose to interpolate the data when you are in Grid mode.

Gridded images are gridded at the resolution of the model, which is 8x10 degrees by default (except the polar cell).

Contour images let you choose how many lines to display for the contour, and you may also fill the contour. Note that a filled contour is equal to the floor() function of an interpolated gridded image.

Vector will let you plot two variables against each other. When in Vector mode, a 2nd variable selector menu appears. The upper menu selects the U (north/south) component of the vector, and the lower selects the V (east/west).

At the time of this writing, EVA does not enforce logic for your vector components. You may plot any variable against either itself or any other variable. To produce valid and logical results, you should limit yourself to variables that clearly denote that they are vector components via the U or V in their name, and display them against their partners (same variable name except for the U or V). Also valid are the variables Vertical Sum of East->West Humidity Flux and its partner North->South.

If your file does not have vector data or only has 1 of the components, you will need to return to the Analyze Output screen of EdGCM and reprocess to get the other vector components.

Map Options

The Map section of the EVA toolbar lets you choose the center latitude and longitude of the image, zoom amount, a map projection, and the fore- and back-ground colors. If you choose the Satellite projection, the latitude and longitude are no longer the center of the map projection, but instead become the sub-satellite location. Also, the user can set the satellite altitude and the tilt of the axis when in the satellite projection (shown).

For detailed information on the map projection code used by EVA, consult the IDL documentation. For general map projection information consult the USGS page at http://erg.usgs.gov/isb/pubs/MapProjections/projections.html

Zoom

The zoom feature behaves as follows (paraphrased from the IDL help for MAP_SET)

This constructs an isotropic map with the given scale, set to the ratio of 1:scale. 
The typical scale for global maps is in the ratio of between 1:100 million and 
1:200 million. For continents, the typical scale is in the ratio of approximately 
1:50 million. For example, SCALE=100E6 sets the scale at the center of the map to 
1:100 million, which is in the same ratio as 1 inch to 1578 miles (1 cm to 1000 km).

Colorbar / Scale

This section of the toolbar lets you choose which colorbar to use, the range of the data, the number of ticks, and the number of decimal places for the colorbar values. To bring up a colorbar selector menu, click on the colorbar.

To use a custom colorbar, follow these steps:

• Download Colorbar Tender (currently available for Mac OS only).
• Create and save your custom colorbar in the following location. The EVA folder should exist. The colorbars folder inside it may not. Create the folder if it does not already exist.
  • Mac: Documents/EVA/colorbars/
  • Win: My Documents\EVA\colorbars\
• Re-start EVA

Auto Range

You can set the minimum and maximum value of the colorbar with the min and max fields. To reset the colorbar to the full range of the data, press the Auto Range button.

Center on 0

The Center on 0 button provides a shortcut to scale the data so that 0 is in the center of the colorbar. This is useful when doing a difference map, especially if the colorbar has white as the center color.

The algorithm is as follows:

min = min(data)
max = max(data)
if abs(max) > abs(min) then range = abs(max)/2.0 else range = abs(min)/2.0
min = -1 * range
max = range

Overlays

The overlays section lets you choose the continent overlay and fill, and grid spacing. For both continent and grid you may select color, thickness, and transparency.

If your data set used a paleo continent, EVA does not know this, and defaults to a modern overlay. Simply select the paleo overlay that matches your data. To turn off grids, set the transparency to 100%.

Custom Overlays

EVA supports custom overlays other than those provided by default. You can provide overlays in one of two formats: CNO or Image.

To use a custom overlay:

• Create and save your custom overlay in the following location. The EVA folder should exist. The overlays folder inside it may not. Create the folder if it does not already exist.
  • Mac: Documents/EVA/overlays/
  • Win: My Documents\EVA\overlays\
• Re-start EVA

CNO format overlays are a list of lon,lat pairs, with seperate regions (continents) delimited by the value 9999. For example:

-70,16
-70,20
-75,20
-75,16
-70,16
9999
-75,20
-75,24
-80,24
-80,20
-75,20

Image format overlays can be GIF, JPG/JPEG, BMP, or PNG format. The background should be white which is displayed as transparent. The continents (outlined or filled) should be black which is displayed as the color selected in the ToolBar for the overlay. Gray is partially transparent.