|ENVI User's Guide: Interactive Display Functions|
Use Overlay to place annotation (text, polygons, symbols, etc.), classifications, density slices, pixel and map grids, contour lines, regions of interest (ROIs) or vector layers over an image or plot.
Use ENVI's QuickMap feature to quickly overlay grid lines, titles, declination diagrams, North arrows, and borders on georeferenced images. For details, see Creating QuickMaps.
When working with overlays (annotation, regions of interest, contours, grid lines, density slices, and vector layers), you can hide the control dialog (e.g., the ROI Tool dialog, the Density Slice dialog, etc.) without erasing the corresponding overlays from your image. When the dialog is hidden, you can hide the associated layers without erasing them.
To remove the overlay control dialog from the screen or hide it without erasing overlays from your image, select one of the following options:
To unhide the overlay control dialog, select one of the following options:
When an overlay control dialog is hidden, you can show or hide the displayed layers:
ENVI Online Help (August 12, 2005)