Mar. 02, 1998

   -- Final Grid Data -- USGS, Yellowstone National Park, WY, MT, ID, 1997

The grids are in gxf format with relevant information contained
in a header.  The following grids used to create the plotted contours
are included:

TMIGRD-N.GXF - Levelled and decorrugated total magnetic intensity, Sheet 1
TMIGRD-S.GXF - Levelled and decorrugated total magnetic intensity, Sheet 2
MAGGRD-N.GXF - Unlevelled total magnetic intensity, Sheet 1
MAGGRD-S.GXF - Unlevelled total magnetic intensity, Sheet 2
RAGRD-N.GXF  - Radar altimeter, Sheet 1
RAGRD-S.GXF  - Radar altimeter, Sheet 2

:----------------------------------------------------------

A sample of the Sheet 1 header is shown below:


                  YELLOWSTONE NATIONAL PARK - USGS, 1997
                  TOTAL MAGNETIC INTENSITY - SHEET 1
                  UTM GRID ZONE 12N, DATUM WGS-84
                  SANDER GEOPHYSICS LTD, MARCH 02, 1998
#POINTS
1213
#ROWS
678
#PTSEPARATION
100
#RWSEPARATION
100
#XORIGIN
479100
#YORIGIN
4935600
#DUMMY
-9999.000
#SENSE
1
#GRID

:----------------------------------------------------------

A sample of the Sheet 2 header is shown below:


                  YELLOWSTONE NATIONAL PARK - USGS, 1997
                  TOTAL MAGNETIC INTENSITY - SHEET 2
                  UTM GRID ZONE 12N, DATUM WGS-84
                  SANDER GEOPHYSICS LTD, MARCH 02, 1998
#POINTS
1223
#ROWS
585
#PTSEPARATION
100
#RWSEPARATION
100
#XORIGIN
478900
#YORIGIN
4880100
#DUMMY
-9999.000
#SENSE
1
#GRID

:----------------------------------------------------------

Data acquired and compiled by:

Sander Geophysics Ltd.
260 Hunt Club Rd.
Ottawa, Ontario, K1V 1C1
Canada

phone: 613-521-9626
fax:   613-521-0215
email: info@sgl.com