Level 2 Help for INTERLOC

NH is a required parameter.  NH must be a positive integer.

NV is a required parameter.  NV must be a positive integer.

The coordinates are entered as (line,sample) pairs, one after another.
The coordinates should be entered in increasing line coordinate value.
In batch mode the coordinates must be specified this way.  In interactive
mode, coordinates can be specified this way or by positioning the cursor
for the HTRACK, HSEARCH, or TRACK parameters.

The coordinates are entered as (line,sample) pairs, one after another.
The coordinates should be entered in increasing sample coordinate value.
In batch mode the coordinates must be specified this way.  In interactive
mode, coordinates can be specified this way or by positioning the cursor
for the VTRACK, VSEARCH, or TRACK parameters.

The starting coordinates of horizontal grid rulings can be entered using
HTRACK or HSEARCH.  The starting coordinates of vertical grid rulings can 
be entered using VTRACK or VSEARCH.  If HTRACK, VTRACK, HSEARCH, or VSEARCH is
specified as keyword values, "interloc" will prompt the user NH times in 
succession for horizontal grid rulings or NV times for vertical grid rulings.
If HTRACK, VTRACK, HSEARCH, or VSEARCH is followed by a single numeric value,
then "interloc" will ask the cursor to be positioned  for a single grid ruling,
(the grid ruling corresponding to the number entered).  If HTRACK, VTRACK, 
HSEARCH, or VSEARCH is followed by two numeric values, say n1 and n2, then 
"interloc" will ask the cursor to be positioned in succession for grid rulings
n1 through n2.  (This is useful if the entire grid image cannot be displayed
at one time.)   When a cursor position has been accepted by "interloc", a small
box marking the position will appear on the display.
Parameters such as HTRACK and VTRACK, which require the user to specify
locations via the trackball, must be specified alone at the "Enter parameters"
prompt.  (Do not place multiple parameters on the same command line when
using HTRACK and VTRACK.)

The syntax for the case of HTRACK would be:

 'HTRACK              to specify all NH horizontal grid rulings.
  HTRACK = n1         to specify horizontal grid ruling n1.
  HTRACK = (n1,n2)    to specify NH horizontal grid rulings n1 through n2.

(See under TRACK.)

(See under TRACK.)

(See under TRACK.)

(See under TRACK.)

If the image is too large to display in its entirety, a portion within the
'display window' is displayed. (See HOME, UP, DOWN, RIGHT, LEFT.)

If the window is already at the top of the image, nothing changes.

If the window is already at the bottom of the image, nothing changes.

If the window is already at the left side of the image, nothing changes.

If the window is already at the right side of the image, nothing changes.

GO sets up for the DISP command to display the diagnostic output image so the
user can make corrections if necessary.  (See the FIX command.)

The user specifies the horizontal and vertical grid ruling numbers whose 
intersection(s) is to be FIXed as values for the FIX parameter.  The user
may enter the number of the horizontal grid ruling followed by the number
of the vertical grid ruling (two values for one intersection) or a range
of the horizontal grid rulings followed by a range of vertical grid rulings
(four values for a range of intersections).   When a range of intersections
is specified, the program accepts coordinates for each intersection on a
specified horizontal grid ruling before moving on to the next horizontal
ruling.  This command can be used to correct intersections not properly found 
by the GO command, or may be used to manually specify the intersections
without using the intersection finding algorithm at all.
Parameters such as FIX, which require the user to specify locations via
the trackball, must be specified alone at the "Enter parameters" prompt.
(Do not place multiple parameters on the same command line when using FIX.)

TEST values are in terms of image coordinates.