ESRL Global Systems Division
Probabilistic Forecasting Exploratory Development
Legend Overlay and Management
Collapse Controls Cheat Sheet
Within AWIPS, legends have been used quite successfully as a user interface device for manipulating the characteristics of overlays. However, anyone familiar with current D2D ensemble capabilities will realize that if several ensemble fields are loaded, legend management becomes very difficult. So one of the goals of this prototyping was to improve that.
Step 1: Start D2D.
Step 2: Open the Volume Browser from the Volume menu on the D2D main toolbar.
Step 3: Choose Sources Ensemble->SREF-21, Fields Basic->Height, Planes Pres->500MB and select Load (make sure the desired fields are highlighted).
Note: There is only one legend, and it has a plus sign on the left side (see below, click on image for full resolution).
Step 4: Click on the plus (+) sign with Mouse Button-1 (MB1), note that a legend appears for each ensemble member (see below, click on image for full resolution).
The individual overlays are still loaded with fewer contours than standard; but now this is done by reducing the density instead of with style info. Now we want to try more of the legend collapse controls. For collapsing and expanding legends, the only thing that matters are the + and - icons on the left side of the legends.
Step 5: Click on a minus (-) sign with Mouse Button-2 (MB2), note this collapses a group of similarily colored overlays (see below, click on image for full resolution).
Step 6: Click on another - sign with MB1, note this collapses all legends again.
Step 7: Click on a + sign with MB2, note this shows all groups but leaves the groups collapsed (see below, click on image for full resolution).
Step 8: Click on any + sign with MB2, note this expands that group (see below, click on image for full resolution).
Step 9: Click on any + sign with MB1, note this expands all legends again.
Step 10: Clear the screen.
Step 11: Exit D2D.