IMGOPER -- Applies mathematical functions to image data
  IMGOPER sdataset1..sdatasetn ddataset <keywords> "comment
Parameters:
  sdataset1..n | source ADDE dataset name(s) and position(s); specify
                 as alias.position or group/descriptor.position (no def
                 for alias or group/descriptor, def=0 for position)
  ddataset | destination ADDE dataset name and absolute position;
             specify as alias.position or group/descriptor.position;
             only positive integers are valid for the position number
  "comment | description placed in the image file directory's memo field;
             32 characters maximum (def=no comment)
Keywords:
**********************  Image Positioning Keywords  **********************
  LATLON=lat lon | latitude and longitude of sdataset image(s) to place
                   at ddataset image location specified in PLACE keyword
  LINELE=line ele sys | line and element numbers and coordinate system
                        (F or I for file and image, respectively) of the
                        sdataset image to place at the ddataset image
                        location specified in the PLACE keyword
                        (line def=0, ele def=line, sys def=F)
  PLACE= | location in the ddataset image to place the point specified in
           the LATLON, STATION or LINELE keyword; use one of the following:
           ULEFT  upper-left corner of image (def when LINELE keyword used)
           CENTER center of image (def when LATLON or STATION keyword used)
  STATION= | station ID, e.g., MSN, YSSY, 72201 to place at the ddataset
             image location specified in PLACE keyword
***********************  Image Selection Keywords  ***********************
  DAY= | selects the most recent sdataset image from the specified day
         (def=most recent image)
  RTIME=bmin emin | selects the most recent sdataset image in the
                    specified range of minutes in the current hour;
                    overrides the TIME keyword (def=most recent image)
  TIME=btime etime | selects the most recent sdataset image in the
                     specified time range (def=most recent image)
***********************  Image Sampling Keywords  ***********************
  BAND=b1..bn | applies the function to the specified image bands
                (def=existing band if image is single-band; no def if
                image is multi-band)
  MAG=lmag emag | line and element magnification of the data (def=1 lmag)
  SIZE=line ele | applies the function to the specified number of sdataset
                  lines and elements (def=480 640)
      =ALL | applies the function to the entire sdataset image; all Image
             Positioning keywords are invalid with SIZE=ALL
  UNIT=| calibration types for the data (def=BRIT)
****************************  Input Keywords  ****************************
  LLMT=l1..ln | lower limit thresholds for each input data value in the
                equation
  ULMT=u1..un | upper limit thresholds for each input data value in the
                equation
***********************  Equation Format Keywords  ***********************
  ACON= | additive constant for the equation (def=0.0)
  COEF=c1..cn | coefficients for each term in the equation (def=1.0)
  FORM= | apply this function to each term in the equation, valid options
          are: ADD, CMAX max new (def=255 255), CMIN min new (def=0 0),
          MAX, MIN, MULT (def=ADD)
  FUNC= | allows a transcendental function operation on the output of the
          additive or multiplicative expression, valid options are: LOG,
          ALOG, LN, EXP, SQRT
  MCON= | multiplicative constant for the equation (def=1.0)
  OFF=o1..on | offsets for each term in the equation (def= 0.0)
  POW=p1..pn | powers for each term in the equation (def=1.0)
  SIGN=s1..sn | multiplies the data; use P to multiply by 1 or
                M to multiply by -1 (def=P)
****************************  Output Keywords  ***************************
  PROD= | product name for destination image, up to 4 chars (def=PROD)
  SCALE=prodlo prodhi britlo brithi | minimum and maximum product and
        brightness values for the calibration (def=0 255 0 255)
  ZERO=DATA | assigns zero pixel values as data and includes them in the
              analysis (def=MISS, meaning treat as missing data)
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