PTDISP -- Displays point data
   PTDISP dataset frame <keywords>
Parameters:
   dataset | ADDE dataset name and position; specify as alias.position or
             group/descriptor.position where position is a positive integer
             (absolute position), 0 or a negative integer (relative
             position), or ALL (no def for group/descriptor or alias;
             position def=ALL if DAY is specified in SELECT keyword,
             otherwise def=0)
   frame | frame number or OPP (opposite) to display output (def=current)
Keywords:
   PARam=p1..pN | list of parameters to plot; the list can contain native
                  and/or computed parameters in the following formats:
                     NATIVE Parameters:    parameter[unit]
                     COMPUTED Parameters:  'parameter[unit]=expression'
                  native parameters are those stored in the point file;
                  computed parameters do not exist in the point file but
                  are derived with the specified mathematical expression
                  containing math operators (+ - * / etc) and native
                  parameters specified in the Pn keywords, e.g.,
                     PAR=ID T[F] TD[F] 'TDD[F]=P1-P2' PSL[MB]
                  see Remarks and Pn keyword description for more
                  information (no def for parameter or expression;
                  unit def=from 'dataset')
   SELect='clause1; clause2; ..; clauseN' |
         selects only data matching the values specified in the select
         clauses, which can be in either of these formats:
            RANGE FORMAT:  parameter[unit] bval eval
            LIST FORMAT:   parameter[unit] val1,val2,..,valN
         any number of select clauses can be specified as long as each
         clause is separated by semicolons and there is a single quote
         before the first clause and after the last clause; units are
         optional but must be in square brackets if specified (no def
         for parameters; unit def=from 'dataset')
            Example:
              SELECT='T[F] 50 60 ; ST MN,IA,IL,WI ; TD[C] -2,-3,-4'
********************  Mathematical Operations Keyword ********************
   Pn=parameter[unit] 'clause1; clause2; ..; clauseN' |
      native parameters to use in the math expressions specified in the
      PARAM keyword; use a number between 1 and 99 in the keyword name
      (P1,P2,..,P99); each keyword specifies a single native parameter and
      units to substitute in matching Pn values in the math expressions
         parameter[unit] is the native parameter name and units to use in
             matching Pn values in the math expressions; the units default
             to those for the parameter in the dataset; there is no default
             for the parameter
         'clause1; clause2; ..; clauseN' are the clauses used to select
             data for this keyword; only data matching their criteria is
             used; they are specified exactly as in the SELECT keyword
      the Pn keywords inherit the clauses specified in the SELECT keyword;
      therefore, you should specify a Pn keyword clause only if a value
      differs from that in the SELECT keyword or you need to add additional
      clauses; e.g., to set the values of P1 and P2 to the 850 and 500 mb
      temperatures in degrees Celsius at 0 UTC, respectively, specify the
      following keywords:
         SEL='TIME 0; P 850'  P1=T[C]  P2=T[C] 'P 1000'
************************  Map/Navigation Keywords  ***********************
   LAT=lat1 lat2 | latitudes of points at lower-right & upper-left corners
                   of the map; you cannot use LAT with NAV or MAP
   LON=lon1 lon2 | longitudes of points at lower-right and upper-left
                   corners of the map; you cannot use LON with NAV or MAP
   MAP= | map for the plot; use any predefined map in MAP command; you
          cannot use MAP with NAV, LAT or LON
   MCOlor= | graphics color level of map (def=1)
   NAV= | frame to use for navigation; specify frame number or C (current
          frame); no map is drawn; you cannot use NAV with MAP, LAT or LON
   PRO=CONF | polar stereographic or Lambert conformal projection
      =MERC | Mercator projection (default)
   SLAt=l1 l2 | standard latitude(s) for a CONF projection; see the Users
                Guide for information and defaults
   SLOn= | standard longitude for a CONF projection (def=computed)
*****************************   Plot Keywords  ***************************
   COLor=c1..cN | graphics color level for each PARAMeter (def=3)
   DEClut=YES | declutter the plot, meaning do not plot overlapping
                values (def)
         =NO  | do not declutter the plot
   ELE=bele eele | beginning and ending frame elements for output; specify
                   MAX for maximum element number (def=1 MAX  when using
                   NAV keyword; def=20 MAX-20  when using MAP keyword)
   FORMAT=f1..fN | output format for each PARAMeter; valid formats are
                   A, I, F, E, K, VECT, FLAG and SYMB; see the Users
                   Guide for details (def=from 'dataset')
   LINe=blin elin | beginning and ending frame lines for output; specify
                    MAX for maximum line number (def=1 MAX-57 when using
                    NAV keyword; def=20 MAX-57 when using MAP keyword)
   LOC=symbol color size | mark the location of each observation with a
                          centered symbol in the specified graphic color
                          level and size; valid symbols are '+', '.', '*'
                          and 'o' (def=+ 3 6 if LOC keyword is specified;
                          otherwise no symbol)
   LSIze=l1..lN | plot height of each PARAMeter, in pixels (def=8)
   MULtiply=m1..mN | number to multiply each PARAMeter by for display; use
                     a number between 0 and 1 to divide (def=1)
   OFFset=l1 e1..lN eN | frame line and element offset of each PARAMeter
                         from the center plot position (def=0 0)
   TDAy=CAL | print calendar day on the default title; not valid if ELE,
              or LINE  keywords are used
       =JUL | print Julian day on the default title (def)
   TITLE='text' color line ele size |  text, color, location & size for
                                       title, where:
                'text' - title's text; 72 characters maximum; specify X
                         without quotes for default text (def=computed)
                color - graphics color level of title (def=value specified
                        in COLOR keyword)
                line - beginning TV line to write title (def=lower-left
                       corner of frame; exact line number depends on frame
                       size and value specified in COLOR keyword)
                ele - beginning TV element to write title (def=20)
                size - pixel size of characters drawn (def=8)
****************************  Output Keywords  ***************************
   BYTecount=YES | lists the number of bytes received from the server
            =NO  | does not list the number of bytes (def)
Remarks:
   PTDISP displays data from records in a point data file.  The SELECT
   keyword defines which records to match and the PARAM keyword defines
   which parameters in the matching records to display.

   The PARAM keyword contains the parameters to plot. The list can contain
   native and/or computed parameters. Native parameters are those stored
   in the point file. They are specified in the PARAM keyword list in the
   format:   parameter[unit]   where "parameter" is the parameter name in
   the file, and "[unit]" is the output units, which are optional but must
   be in square brackets if specified. Computed parameters do not exist in
   the point file but are derived with a mathematical expression. Computed
   parameters are specified in the PARAM keyword list in the format:
   'parameter[unit]=expression'   where "parameter" is the user-defined
   parameter name; "[unit]" is the label units, which are optional but must
   be in square brackets if specified; and "expression" is the mathematical
   expression consisting of math operators and one or more native
   parameters defined in the Pn keywords. The valid math operators are
   +,-,/,*,**,SQRT,EXP,LOG,LOG10,SIN,COS,TAN,ASIN,ACOS,ATAN,ABS,MIN and
   MAX. See the McIDAS User's Guide for definitions of the operators.

   The following character limits exist for PARAM keyword:
      - 256 characters maximum for the entire PARAM keyword list
      - 12 characters maximum for the computed parameter name
      - 12 characters maximum for the computed parameter units

   If PTDISP has started to plot data, you can stop it by pressing ALT-Q.
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