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NAMEd.geodesic - Displays a geodesic line, tracing the shortest distance between two geographic points along a great circle, in a longitude/latitude data set.KEYWORDSdisplay, distance, great circle, shortest pathSYNOPSISd.geodesicd.geodesic --help d.geodesic coordinates=lon1,lat1,lon2,lat2 [line_color=name] [text_color=name] [units=string] [--help] [--verbose] [--quiet] [--ui] Flags:
Parameters:
DESCRIPTIONd.geodesic displays a geodesic line in the active frame on the user’s graphics monitor. This is also known as the great circle line and traces the shortest distance between two user-specified points on the curved surface of a longitude/latitude data set. The two coordinate locations named must fall within the boundaries of the user’s current geographic region.OPTIONSBy default black line color and red text color will be used.By indicating the starting and ending coordinates of the geodesic, the line and its length (by default in meters) are displayed to the graphical output. If the text color is set to none, the great circle distance is not displayed. EXAMPLEA geodesic line if shown over the political map of the world (demolocation dataset):g.region vector=country_boundaries -p d.mon wx0 d.vect country_boundaries type=area # show additionally a 20 degree grid d.grid 20 d.geodesic coordinates=55:58W,33:18S,26:43E,60:37N \ line_color=yellow text_color=red units=kilometers Geodesic line (great circle line) NOTESThis program works only in GRASS locations with longitude/latitude coordinate system.SEE ALSOd.rhumbline, d.grid, m.measureAUTHORMichael Shapiro, U.S. Army Construction Engineering Research LaboratorySOURCE CODEAvailable at: d.geodesic source code (history)Main index | Display index | Topics index | Keywords index | Graphical index | Full index © 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual
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