JOB 97-83
ARCHIVES
MARS PROJECT
Yukon Territory
Placer Dome Canada
This document describes the contents of the CD ROM in terms of:
1)
2)
3)
1)
the subdirectory structure of the CD ROM
the line profile archive structure
the grid file structure and parameters.
CD ROM Subdirectory Structure
The CD ROM has the following subdirectories:
\doc
\profiles
\grids
3)
contains this document (README.DOC)
contains the Geosoft .XYZ line profile archives
contains the Geosoft .GRD files (grid files)
Line Profile Archive Structure
The profile archive contain the easting (X) coordinate and northing (Y)
coordinates which
are standard UTMs in ground metres in the NAD83 (North American Datum - 1983)
using the
standard UTM Zone #8 (central meridian of 135 degrees west longitude).
The profile archives are as follows:
PROF.XYZ
- MAG, altimeter and radiometric profile archives
Also, in the profile subdirectory is a summary file called PROF.SUM. This is
a summary file of the .XYZ file and includes the line number, the number of data
points on the line and the minimum and maximum X, Y and time values for the
line.
The following is a detailed description of the line profile archive which
has been archived at a sample rate of 0.2 seconds (i.e. 5 readings per second):
XYZ
COLUMN
1
2
3
4
5
6
6
FORMAT
f10.1
f10.1
f10.2
f10.1
f10.1
f10.1
f10.1
UNITS
metres
metres
nanoteslas
metres
metres
metres
cps
DESCRIPTION
X = easting (NAD83, Zone 8)
Y = northing (NAD83, Zone 8)
final processed total field magnetics
radar altimeter
barometric altimeter
digital elevation model
total count
8
9
10
11
12
13
f10.1
f10.1
f10.1
f10.2
f10.3
I6
cps
potassium
cps
uranium
cps
thorium
second after midnight
time
units
manual fiducials
units
flight number
Calculated Record Length
3)
:
126
Grid File Structure and Parameters.
All grids have been written to CD ROM as standard Geosoft grids (.GRD) and have
the following characteristics:
X origin
Y origin
grid cell size
# columns (X)
# rows (Y)
500,650 metres east
6,782,550 north
25 metres
857
920
The following grids have archived:
MAG.GRD
CVG.GRD
TC.GRD
K.GRD
U.GRD
TH.GRD
DEM.GRD
- total field magnetics (nT)
- calculated vertical gradient magnetics (nT/M)
- total count (cps)
- potassium (cps)
- uranium (cps)
- thorium (cps)
- digital elevation model (M)