Level 2 Help for TEXTAD

 a standard VICAR input dataset

 a standard VICAR output dataset

 (SL,SS,NL,NS)  starting line,starting sample,number
  of lines, number of samples

 The starting line of the size field

 The starting sample of the size field

 The number of lines of the size field

 The number of samples of the size field

 Large characters, 14 lines by 12 samples, are used
 Default is that characters 7 lines by 6 samples are drawn.

 The three possible keywords (BLACK, WHITE, and MODULATE) control the DN
 used in character and line definition.  BLACK produces 0 DN characters;
 WHITE produces 255 DN characters; MODULATE produces 0 DN characters if the
 average DN under the text is greater than 128, 255 DN characters otherwise.
 If the parameter ADD is used, it supercedes these keywords.  The default
 is WHITE.

 BACKGRND=DNVALUE
 A one pixel (two pixels if large is specified) border around 
 the text string and the background for the text string is set 
 to DNVALUE.  

 ADD=DN      The DN specified will be added to the data
 to create the text.  If specified, this value supercedes WHITE, BLACK, or 
 MODULATE keywords.

 TEXT=(SL1,SS1, SL2,SS2, ...)
 These are the coordinates for positioning the associated string of text.
 Each pair of numbers specify the line and sample where the upper left
 corner of the associated string is to be located. If the parameter 
 BACKGRND is specified, the upper left corner of the border area around
 the text string is positioned at these coordinates. This means the
 text string itself will start 1 pixel (2 if LARGE is specified) down
 and to the right of these coordinates.  Up to 100 pairs of numbers
 may be specified.

 STRING=("string1","string2", ...)
 These are the text strings to be inserted into the image at the positions
 specified by the associated TEXT values. Up to 100 strings may be
 specified. Each string may have up to 100 characters.

 AREA=(SL1,SS1,EL1,EL1, SL2,SS2,EL2,ES2, ...) 
 Specifies that rectangles with upper left corners at SLn,SSn and
 lower right corners at ELn,ESn will be drawn. Up to 75 rectangles
 may be specified, each rectangle being specified by a group of
 four numbers.