ABEM Terrameter SAS 1000 / SAS 4000
- 114 -
If the mode is
2R
the data values are resistance values (measured
in ohms)
Line 7
*
:
Measurement method. This may be any suitable text describing
how the data were acquired, preferably one word. For example:
Section, Sounding etc.
Line 8
*
:
Electrode layout. It comprises one, two, or three values. The
second and third parameters are optional. The first parameter is an
integer code, the second is the name of the layout as a text string
and the third parameter defines a three-letter abbreviation. For a
list of valid codes see table a: available electrode layout codes,
names and three-letter abbreviations. (Page 118)
Line 9
*
:
Co-ordinate type. Can be
Index
or
XYZ
:
0|1|2|3
.
Line 10
*
:
Smallest electrode spacing in meters.
Line 11
*
:
Data defining marine (underwater) surveys. There four
parameters; resistivity of the water layer, thickness of the water
layer relative the local datum, left and right limits of water layer
(e.g. when crossing a river). In a normal measurement (i.e. on-
shore) there are dashes in the positions for the marine survey data.
Line 12-19:
Protocol #1-#8. Names of the protocols used to control the
measurements. Usually used in connection with multi-electrode
switch systems.
Line 20:
Operator.
Line 21:
Client.
Line 22-25:
Comment #1-#4.
Line 26
*
:
Blank line.
Line 27
*
:
Legend. This line describes the items in the datelines.
Line
N
H
+1 to
N
H
+
N
D
:
Data.
NOTE!
In future extensions of the data format new items may be added after line 11. In
this case the line numbers for lines 12-27 will be incremented accordingly.
*)
The files marked with an asterisk must always be defined in the file header.
16.3
HEADER
Index coordinate type
This type comprises three parameters; transmitter index (Tx), receiver index (Rx) and spacing
multiplier index (Dx). They denote multiples of the smallest electrode spacing. If any of these
indices is invalid or not defined for a certain array it will be set to 0 (zero). In the case of two
indices being identical, they will have equal values.
Tx:
Location of the leftmost transmitting electrode, except for the gradient array and
potential (SP) measurements, where it is the leftmost moveable receiving
electrode.
Rx:
Number of electrode spacings between the rightmost transmitting electrode and
the
leftmost
receiving
electrode.
For reversed pole-dipole arrays (i.e. the transmitting moving electrode is located
