PLOTGLOB

Name

plotglob

Purpose

Plot a globe projection with latitude and longitude lines

Description

Calling Sequence

plotglob,lon,lat,polang

Inputs

lon - East longitude of center of disk (degrees)
lat - Latitude of center of disk (degrees)
polang - Position angle of North (CCW from +y, in degrees)

Optional Input Parameters

Keyword Input Parameters

BORD - Flag, if set, put a ticked border around plot.
DLAT - Spacing between latitude lines (default=30 degrees)
DLON - Spacing between longitude lines (default=30 degrees)
DP - Angular step size for plot lines (default=5 degrees)
COLORS - 4 element vector that specifies color indicies for
various line elements in the plot. The default
is a white line for displays and a black line
for postscript output.
colors[0] - Prime meridian and equator
colors[1] - 180 deg longitude meridian
colors[2] - Other grid lines
colors[3] - Limb
LINESTYLE - Linestyle for wire grid, default=0
NOERASE - Flag, if true, suppresses initial erase of plotting
area before globe is drawn. Used for overplotting
the grid on an image.
POSITION - Optional 4-element vector that sets location of
plot on the plotting device (this is a standard PLOT keyword)
DEVICE - Flag, if true, means POSITION is in DEVICE units, otherwise,
POSITION is taken to be in normal units. (standard PLOT
keyword)
PAD - Pad amount in the plot window. The width of the plot is
2*(1+pad) where 1 is the radius of the globe. The default
value is pad=0.15
NOLIMB - Flag, if true, supresses plotting the limb of the globe.
LATPTS - Latitude vector of positions to compute X,Y on plot for.
LONPTS - Longitude vector of positions to compute X,Y on plot for.
Both of LATPTS and LONPTS must be provided and must be the
same length. If this condition is met, then XPTS,YPTS will
contain the x,y positions of these lat/lon pairs on the
plot. If the condition is not met then any input through
these keywords is silently ignored.
OFFSET - Optional offset (x,y) of center of disk in units of disk radius
default=0,0

Outputs

Keyword Output Parameters

XPTS - X position of LATPTS/LONPTS input
YPTS - Y position of LATPTS/LONPTS input
ZPTS - Z position of LATPTS/LONPTS input (positive means it's
on the visible part of the globe, negative means it is
on the back side).

Common Blocks

Side Effects

Restrictions

Procedure

Modification History

96/01/26, Written by Marc W. Buie, Lowell Observatory
96/02/12, MWB, added POSITION and DEVICE keyword support
96/05/10, MWB, added NOLIMB keyword
2002/03/15, MWB/Joel Parker, added BORD, LATPTS, LONPTS, XPTS, YPTS
keywords. Also, the /ISOTROPIC keyword is set on the
initial plot call.
2009/01/16, MWB, added LINESTYLE keyword
2015/11/09, MWB, added OFFSET keyword