GDTSER draws a time series of a scalar at a single level.

INPUT PARAMETERS
 
    GPOINT    *Grid point
    GDATTIM   *Grid date/time
    GLEVEL    *Grid level
    GVCORD    *Grid vertical coordinate
    GFUNC     *Grid function
    GDFILE    *Grid file
    PTYPE     *Plot type/h:w ratio/margins
    TAXIS     *Time1-time2-tinc;lbl;gln;tck
    YAXIS     *Ystrt/ystop/yinc/lbl;gln;tck
    BORDER    *Background color/dash/width
    LINE      *Line color/type/width/label
    MARKER    *Marker color/type/size/width/hw
    TITLE     *Title color/line/title
    CLEAR     *Clear screen flag
    SCALE     *Scaling factor
    PANEL     *Panel location/color/dash/width
    DEVICE    *Graphics device
    TEXT      *Text size/font/width/hw flag
 
 

PROGRAM DESCRIPTION
 
    GDTSER draws a time series of a scalar parameter at a
    fixed level.  The variable may be any scalar computed by
    the grid diagnostics package.

    GPOINT specifies the location for the time series.  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 times to plot are specified in GDATTIM.  Only those
    times specified will be plotted.  Lines will be drawn
    connecting the data points provided no more than two
    points are missing between segments.  Note that the times
    may represent a series of base times with the same or no
    forecast time, or a series with the same base time and
    a list of forecast times.

    The time axis is specified in TAXIS using the usual GEMPAK
    date/time conventions, including FIRST and LAST.  If
    TAXIS has no increment, a reasonable value is chosen.
    If TAXIS is blank, the limits are taken from the first and
    last valid times set in GDATTIM.

    If the user desires multiple lines on the same graph,
    TAXIS and YAXIS should be explicitly set; then LINE, MARKER,
    and TITLE can be varied for successive combinations of GLEVEL,
    GVCORD, GPOINT, and GFUNC.

    The axis type, height-to-width ratio of the plot and the
    margins may be specified in PTYPE.


EXAMPLES
 
    1.  Plot the BWI 500 mb temperature for the 00-h forecast
        times for model runs initialized at times between 26/12
        and 31/00.  Use the default line, marker, title and
        background colors.  Label the Y axis from -40 to 0 in
        increments of 10 degrees.  Label the time axis from
        26/00 to 31/12 in increments of 12 h.  Make the plot
        half as high as wide.

        GDATTIM  =  26/12f00-31/00f00
        GLEVEL   =  500
        GVCORD   =  pres
        GFUNC    =  tmpc
        GPOINT   =  bwi
        GDFILE   =  ngm.grd
        PTYPE    =  lin/.5
        TAXIS    =  26/00-31/12-12
        YAXIS    =  -40/0/10
        BORDER   =  1
        LINE     =  1
        MARKER   =  1
        TITLE    =  1
        CLEAR    =  yes
        SCALE    =  999
        PANEL    =  0
        DEVICE   =  xw


    2.  Using the same file, plot a time series of the 800 mb
        geostrophic wind speed at latitude and longitude of 39
        and -77 for all forecasts initialized at 29/00.  Plot
        the graph with the height/width ratio of 0.3 in the top
        half of the page and use internal scaling for both axes.

        GDATTIM  =  29/00fall
        TAXIS    =
        GLEVEL   =  800
        GFUNC    =  mag ( geo )
        GPOINT   =  39;-77
        PTYPE    =  /.3
        YAXIS    =
        PANEL    =  t


ERROR MESSAGES
 
    [GDTSER  -1]    Fatal error initializing TAE.
    [GDTSER  -2]    Fatal error reading TAE parameters.
    [GDTSER  -3]    Fatal error initializing GEMPLT.
    [GDTSER  -4]    Input for GPOINT is invalid.
    [GDTSER  -5]    Input for GLEVEL is invalid.
    [GDTSER  -6]    Input for GVCORD is invalid.
    [GDTSER  -7]    Input for PTYPE is invalid.
    [GDTSER  -8]    Error defining graph coordinates.
    [GDTSER  -9]    No points found for plot of ....
    [GDTSER -10]    Some points missing for plot of ....
    [GDTSER -11]    Input for ... in TAXIS is invalid.
    [GDTSER -12]    Time range is size zero.
    [GDTSER -13]    No grids found with times in GDATTIM.