nasa 4dThis value should be one of SM, GSM, GSE, GM, GEO, GEI_J2000, GEI_TOD. This parameter is optional and defaults to the 4D Orbit Viewer's default value. resolution: small integer: ThisSPDF News & Announcements. Try out our browser-based 4D Orbit Viewer to display the SSC spacecraft orbits in an interactive 3-D animation tool ().Please let us know of any questions,