When the displayed image is referenced using geographical coordinates one can export the image plus its other graphical contents into a .kmz file (a .kmz is just a .kml file zipped and changed the extension name). Due to is potential large size, coastlines are not exported. Furthermore Google Earth, at smaller scales display it own coastlines, which are very low quality as compared with the GMT ones used by Mirone.
The Datasets plate boundaries, earthquakes and volcanoes have special extra information associated with them.
To save space Mirone tries to be clever in picking the most economic file format used to save images. Images derived from grids with NaNs will have those values set to transparent.
Copyright © <2010>, <Joaquim Luis>
Created with the Freeware Edition of HelpNDoc: Full featured multi-format Help generator