GDPROF draws profiles of a scalar grid and/or a vector grid.

INPUT PARAMETERS
 
    GPOINT    Grid point
    GDATTIM   Grid date/time
    GVCORD    Grid vertical coordinate
    GFUNC     Scalar grid
    GVECT     Vector grid
    GDFILE    Grid file
    LINE      Color/type/width/label/smth/fltr/scflg
    MARKER    Marker color/type/size/width/hw
    BORDER    Background color/type/width
    PTYPE     Plot type/h:w ratio/margins
    SCALE     Scalar scale / vector scale
    XAXIS     Xstrt/xstop/xinc/lbl;gln;tck
    YAXIS     Ystrt/ystop/yinc/lbl;gln;tck
    WIND      Wind symbol/siz/wdth/typ/hdsz
    REFVEC    Mag;x;y;txtsiz/font/wdth/HW;labl
    WINPOS    Wind position
    FILTER    Filter data factor
    TITLE     Title color/line/title
    PANEL     Panel loc/color/dash/width/regn
    CLEAR     Clear screen flag
    TEXT      Size/fnt/wdth/brdr/N-rot/just/hw flg
    DEVICE    Device|name|x size;y size|color type
    OUTPUT    Output device/filename
    THTALN    THTA color/dash/width/mn/mx/inc
    THTELN    THTE color/dash/width/mn/mx/inc
    MIXRLN    MIXR color/dash/width/mn/mx/inc
 
 

PROGRAM DESCRIPTION
 
    GDPROF draws vertical profiles at a point.  Data from each
    level in the grid file are interpolated to the point.

    GPOINT specifies the location for the profile.  It may be
    entered as a latitude and longitude separated with a semicolon,
    as a station character identifier or station number, or as a
    set of x and y grid points separated with a semicolon and
    preceded with an @.  The profile location may also be selected
    graphically with the CURSOR command.  The location of the
    profile is then selected by clicking on a horizontal map in
    another GEMPAK XW window.

    Profiles are plotted in an animation sequence by specifying more
    than one time in GDATTIM.

    The vertical coordinate, set in GVCORD, can be PRES, THTA, or
    HGHT.  The vertical axis type, set in PTYPE, can be LIN,
    LOG, KAP, or SKEW.  Only temperatures vs. pressure may be
    plotted on a skew t plot.  The height-to-width ratio of the
    plot may be specified in PTYPE following a /.  If no value is
    entered, a value of 0 will be used.

    GFUNC is computed at every level in the data set.  No errors
    are returned if the function cannot be computed at any level,
    except at the surface.  If data at the surface cannot be
    computed, a warning message is written and plotting continues.
    GVECT specifies a vector to be plotted in the right margin.

    If GFUNC is a temperature or dewpoint temperature, background
    lines of potential temperature, equivalent potential
    temperature and mixing ratio can be displayed by specifying
    THTALN, THTELN, and MIXRLN.  If these background lines are
    requested and GFUNC is not a temperature, an error message
    is generated.

    GVECT specifies a vector grid to be displayed as arrows or
    barbs in one of three display columns on the right of the
    profile plot. For a wind vector field, the default is north
    relative direction. A "/G" indicates grid relative direction.
    The number of the column is specified in WINPOS.

    If M is entered in WIND, winds will be displayed in m/s unless
    the KNOTV operator has been specified in GVECT, in which case the
    winds will be displayed in knots.  If K is entered in WIND,
    the wind is displayed in knots.

 
EXAMPLES
 
    1.  Plot temperature in Celsius on a log P chart at IAD for
        the latest time in the file.  Label the Y axis from 1000 mb
        to 100 mb in increments of 100 mb.  Label the X axis from
        -40 degrees to +40 degrees in increments of 10 degrees.  Add
        all the background lines.  Plot wind barbs in the right margin.

	GPOINT	 =  iad
	GDATTIM	 =  last
	GVCORD	 =  pres
	GFUNC	 =  tmpc
	GVECT	 =  wnd
	GDFILE	 =  $GEMPAK/data/hrcbob.grd
	LINE	 =  2//3
	MARKER	 =  5//1.25
	BORDER	 =  1
	PTYPE	 =  skewt
	SCALE	 =  0
	XAXIS	 =  -40/40/10
	YAXIS	 =  1000/100/100/;1
	WIND	 =  bm6//2
	REFVEC	 =  10
	WINPOS	 =  1
	FILTER	 =  no
	TITLE	 =  1/3
	PANEL	 =  0
	CLEAR	 =  yes
	TEXT	 =  1
	DEVICE	 =  xw
	OUTPUT	 =  n
	THTALN	 =  8/3/1
	THTELN	 =  23/1/1
	MIXRLN	 =  16/10/2

    2.  Overlay the dewpoint for IAD. Do not redraw the background
	lines. Plot the wind in grid relative direction.

	GPOINT	 =  iad
	GDATTIM	 =  last
	GVCORD	 =  pres
	GFUNC	 =  dwpc
	GVECT	 =  wnd/G
	GDFILE	 =  $GEMPAK/data/hrcbob.grd
	LINE	 =  3//3
	MARKER	 =  5//1.25
	BORDER	 =  1
	PTYPE	 =  skewt
	SCALE	 =  0
	XAXIS	 =  -40/40/10
	YAXIS	 =  1000/100/100/;1
	WIND	 =  0
	REFVEC	 =  10
	WINPOS	 =  1
	FILTER	 =  no
	TITLE	 =  0
	PANEL	 =  0
	CLEAR	 =  no
	TEXT	 =  1
	DEVICE	 =  xw
	OUTPUT	 =  n
	THTALN	 =  0
	THTELN	 =  0
	MIXRLN	 =  0

    3.  Clear the screen and plot the vorticity at BWI in
        color number 2 using a dashed line.  Do not plot any
        winds.  Have the graph plot in a second window named
	"profile2".

	GPOINT	 =  bwi
	GDATTIM	 =  last
	GVCORD	 =  pres
	GFUNC	 =  vor(wnd)
	GVECT	 =
	GDFILE	 =  $GEMPAK/data/hrcbob.grd
	LINE	 =  2/2/3
	MARKER	 =  0
	BORDER	 =  1
	PTYPE	 =  log
	SCALE	 =  5
	XAXIS	 =
	YAXIS	 =  1000/300/100
	WIND	 =
	REFVEC	 =  10
	WINPOS	 =  1
	FILTER	 =  no
	TITLE	 =  1/3
	PANEL	 =  0
	CLEAR	 =  yes
	TEXT	 =  1
	DEVICE	 =  xw|profile2
	OUTPUT	 =  t
	THTALN	 =  0
	THTELN	 =  0
	MIXRLN	 =  0

ERROR MESSAGES
 
    [GDPROF  +2]   WARNING:  ... not found.  CONTINUING---
    [GDPROF  +1]    Invalid parameter for background lines.
    [GDPROF  -1]    Fatal error initializing TAE.
    [GDPROF  -2]    Fatal error reading TAE parameters.
    [GDPROF  -3]    Fatal error initializing GEMPLT.
    [GDPROF  -4]    Input for GPOINT is invalid.
    [GDPROF  -5]    Input for GDATTIM is invalid.
    [GDPROF  -6]    Input for GVCORD is invalid.
    [GDPROF  -7]    Input for PTYPE is invalid.
    [GDPROF  -8]    Error defining graph coordinates.
    [GDPROF  -9]    No points found for profile.
    [GDPROF -10]    There are no levels at this time.
    [GDPROF -11]    Input ... for YAXIS is invalid.
    [GDPROF -12]    Input ... for XAXIS is invalid.