The Use and Calibration of the Kern ME5000 Mekometer - SLAC ...

&F =
R-r<
Dh*R+H m
2.4.2. Curvature correction
ME5000 Data’Reductions
The opposite of the beam curvature correction (2.2.2), this correction reduces the distance along the
chord to that along the arc, -
02
DEu. = DREF +
24 CR + f-&l2
The magnitude of this correction is very smaIl, Table 4. Lie K1 and K2, it is included for the sake of
completeness.
TABLE 4. Chord to arc correction
Distance
D (m)
2ooo
8000
Correction
4.066
4.525
3. INPUTFILES
Since h&KRED usually runs in the Geonet environment, the management of all input and output files
is performed through selection of items from menus. If the user wishes to run MIXRED outside the Geonet
environment, it is only necessary to create the MMO.PRM file and place it in the correct subdirectory.
3.1. Parameter File
As the user negotiates the Geonet data reduction menus, a file is prepared containing the names of all
I./O files needed by Mekred. MEKRED looks for this file as C:\GEONET’VM\MEKO.PRM. Lines 3-7 are
used by LJSRED, the level reduction program that runs immediately prior to h&KRED. Lines l-2, 7-l 1 are
used by hkKFU?D. If the user wishes to run h!bKRED in stand-alone mode, it is not necessary that the files
referred to in lines 3-6 even exist, provided a file of elevations exists as described in line 7.
3.2. Raw Measurement File
N:\DATA\BLINE\MEKO\SRV9\
N:\DATA\BLINE\MEKO\SRV9\SRV9.IDX
N:\DATA\BLINE\MEKO\SRV9\INVLEVEL.IVL
N:\DATA\BLINE\MEKO\SRVg\BM.DAT
N:\CALIB\SLC\LROD\CALl\OFFSET.IDX
C:\GEONET\TEMP\LEVRED.LST
C:\GEONET\TEMP\HEIGHTS.DAT
N:\CALIB\SLC\MEKO\CALl\CALl.DAT
C:\GEONET\TEMP\MEKRED.OUT
C:\GEONET\TEMP\MEKREDH.RES
C:\GEONET\TEMP\MEKREDS.RES
The index fde, identified on the second line of MEKO.PRM contains a list of all the raw measurement
files for that particular survey (SRV9 in the above example). MEKRED works its way through this index
file, taking one data file at a time. Two different formats have been used for these raw data files. The old
format uses a fixed record length of 125 characters (125 characters per line). Since this was inconvenient
for editing, the format was changed to a fixed record length of 79 characters (79 characters per line)
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