NAME

     aint - areal interpolation

SYNOPSIS

     aint [ -P1inpick ] [ -Ootap ] [ -dydy ] [ -dxdx ] [ -nyny  ]
     [  -nxnx ] [ -iliili ] [ -idiidi ] [ -X ] [ -Ddef ] [ -lidi-
     lidi ] [ -V ] [ -? ] [ -h ]

DESCRIPTION

aint reads an ascii file with "li di z" triplets, grids the
z values into regularly spaced samples in x and y, and out-
puts the grid in a USP-formatted record. The ascii file
should contain one triplet per line. Each member of each
triplet in the ascii file must be separated by white space.
Each trace of the output grid will contain the gridded z
values for a given depth index (di) and each sample of the
output grid will contain the gridded z values for a given
line index (li).

aint gets both its dataset names and its parameters from
command line arguments. These arguments specify the input
horizon file, the output gridded horizon file, the number of
li's, the number of di's, the li spacing, the di spacing,
the type of interpolate, the starting li number, the start-
ing di number, and information about how to handle data
beyond the convex hull.

Command line arguments
-P1inpick
Enter the input ascii horizon file name immediately
after typing -P1. This input file should include the
complete path name if the file resides in a different
directory. Example -P1/b/vsp/dummy tells the program
to look for file 'dummy' in directory 'vsp' stored on
the 'b' disk.

-Ootap
Enter the output USP-formatted file name after typing
-O. The output file also requires the full path name
(see above). The output file will contain one record
with nx traces and ny samples.

-dydy
Enter the spacing in feet or meters between lines after
typing -dy.

-dxdx
Enter the spacing in feet or meters between depth
indexes after typing -dx.

-nyny
Enter the number of lines after typing -ny. The
maximum number of lines is 4000.

-nxnx
Enter the number of depth indexes after typing -ny.

-iliili
Enter the starting li that corresponds to the first
record on the velocity field. This value will be sub-
tracted from the li in the ascii file (assumed to be in
the first field) to map into the velocity records. The
default is 1 which will work correctly if the first li
is 1. This bias will be restored on output. Note that
an input pick will not be output if it is not in the
domain of the velocity field.

-idiidi
Enter the starting di that corresponds to the first
trace on the velocity field . This value will be sub-
tracted from the li in the ascii file (assumed to be in
the second field) to map into the velocity traces. The
default is 1 which will work correctly if the first di
is 1. This bias will be restored on output. Note that
an input pick will not be output if it is not in the
domain of the velocity field.

-X Enter -X on the command line to grid within the convex
hull defined by the input points.

-Ddel
Enter the value to use beyond the convex hull after
typing -D. The default is 999999. Zero is a valid
value to use as long as none of your input values
(depths) are actually zero.

-lidilidi
Enter the interpolation mode after typing -lidi.
0 = Amomap contouring (very slow with many input points)
1 = Interpolate both inline and crossline and average.
2 = Interpolate in the inline and then fill.
3 = Interpolate in the crossline and then fill.
4 = No interpolation (useful to diagnose edge effects).
5 = Plot pick number.
6 = Plot pick line or cross-line number.
7 = Set location of pick to -del.

-V Enter the command line argument '-V' to get additional printout.

-? Enter this (or '-?' if you are running in c-shell) to get online help. The program will terminate after printing this.

-h Enter this option to get online help. The program will terminate after printing this.

BUGS

     None known.

AUTHOR

     Gary Murphy

COPYRIGHT

     copyright 2001, Amoco Production Company
               All Rights Reserved
          an affiliate of BP America Inc.