----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
LOCALG
----+----0----+----0----+----0----+----0----+----0----+----0----+----0----+----0
COLUMNS FORMAT DESCRIPTION DEFAULT VALUE & UNITS
1-6 A6 LOCALG - Requests appliation and possibly
estimation of gravity anomalies. Gravity
anomalies [1] are regional (local) departures
from the gravity field implied by the
input set of spherical harmonics.
The location of the gravity anomaly is
specified on a second card [2].
7-14 I8 Gravity Anomaly number. This is a unique number
specified by the user to identify the gravity
anomaly parameter. No two gravity anomaly parameters
may use the same gravity anomaly number. Information
about the area of the gravity anomaly parameter is
input on a grid [3]. The gravity anomaly number
helps link up information from the grid to the
gravity anomaly parameter.
18-24 I7 Grid Number [3]. Information about the gravity
anomaly area is given on an external grid.
The grid number identifies the grid which is
being used. All gravity anomaly parameters in
the same run must use the same grid.kk
25-44 D20.8 A priori value of the gravity anomaly at mgals
the center of the master block. [2]
73-80 D8.3 Standard deviation of gravity anomaly. A
value > 0 results in estimation of gravity
anomalies.
Note [1] The parameters are free air anomalies on the surface of
a sphere with radius (a*a*b)**(1/3) where a is the semi
major axis and b is the semi minor axis of the central
body.
Note [2] A card which is blank in COLs 1-6 must follow each
LOCALG card. This second card contains information
in COLs 7-66 about the location of the gravity anomaly.
Note [3] When LOCALG parameters are present, IIS searches for
a data set called SUBBLK. SUBBLK contains points which
are assigned to the LOCALG parameters. The points represent
subdivision areas of the LOCALG parameters and are used
to numerically integrate the equations which upward continue
the gravity anomaly to the satellite location.
SUBBLK is a formatted data set as follows:
7-14 I8 Gravity Anomaly number. This is a unique number
for LOCALG parameters. At least one (preferably
more than one) grid point will match each LOCALG
parameter's gravity anomaly number.
18-24 I7 Grid Number. This is a number which uniquely
identified the grid (all points on the grid have
the same grid number.
25-49 D25.16 Geocentric latitude of grid point (degrees)
50-74 D25.16 Longitude of grid point (degrees)
75-99 D25.16 Area on unit sphere represented by the grid point
IF CARD OMITTED: Gravity anomalies will not be applied.
FEB 2003
0302.0
GLOBAL SET
LOCALG (cont)
SECOND CARD
___________
----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
----+----0----+----0----+----0----+----0----+----0----+----0----+----0----+----0
COLUMNS FORMAT DESCRIPTION DEFAULT VALUE & UNITS
1-6 A6 Contains information about master
block and its subdivisions.
7-21 D15.2 Latitude of the center of the master deg
block.
22-36 D15.2 East longitude at the center of the deg
master block.
37-51 D15.2 Size of the master block in the direction deg
of latitude.
52-66 D15.2 Size of the master block in the direction deg
of longitude.
IF CARD OMITTED: And LOCALG was requested the program will
terminate abnormally.
FEB 2003
0302.0
GLOBAL SET - Option Cards