Geodolite Trilateration Data Set

For a description of the data collection procedures and precision, see: Savage, J.C., and W.H. Prescott, Precision of Geodolite distance measurements for determining fault movements, Journal of Geophysical Research, 78, 6001-6008, 1973.

Geodolite Positions

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Sample

anza  arling     a 33 52 16.842  -117 28 14.350     d  564.00   aa 'arling 1974' NCER
anza  arling80   n 33 52 17.000  -117 28 14.000     n  564.00   aa 'arling l980' USGS
anza  asbesrm1   n 33 37 39.000  -116 27 29.000     n 1600.20   hh 'asbestos no 1 l939' USCGS
anza  asbestos   a 33 37 39.304  -116 27 29.872     a 1604.80   bb 'asbestos l939' USCGS
anza  bachelor   a 33 36 19.504  -117 03 41.192     a  780.00   bb 'bachelor 1939' USCGS

Geodolite Line Lengths

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Sample

anza  asbestos laquinta 871211 1434  58.1  16061.7423 + 16012.7427  0.0002 red    16053.466 0.471 251.098 290.68  904.22  7.55 +          383.40 0.477 1.756 7600 7601  kc g sn104   1604.80 -.048 1.485            h    ef    2  352 545 545  85 2
anza  asbestos laquinta 881116 1417  58.1  16061.7374 + 16012.7378  0.0011 red    16055.094 2.006 257.039 285.22  907.79  4.09 +         1604.80 0.475 1.500 7595       wk/g sn124    383.40 -.048 1.805            /h   if    1  164 415 555  80 2
anza  asbestos laquinta 91 5 3 0855  58.1  16061.7431 + 16012.7435  0.0030 red    16055.101 2.008 256.771 283.60  902.28  4.51 +         1604.80 0.477 1.440 7601       wk/g sn104    383.40 -.048 1.625            /h   if    1  164 535 515 100 3
anza  asbestos lookout  811112 1200 232.4  13488.1455 + 13484.2831                13487.513 0.438 233.802 289.41  836.83  4.53 +         1704.00 0.477 1.230 2198 6950  monr sn104   1604.80 -.026 1.480 4093       oe s   af  2   c   a1  76  90 2  13488.1448
anza  bachelor elsinore 74 212      269.3  26086.1850 + 26080.5419                26085.665 0.471 259.029 284.20  909.95  5.76 +         1090.00 1.480 1.270            ziag sn104    780.00 0.000 1.716            os         2       71  64 105 2  26086.1880
anza  bachelor elsinore 75 5 2      269.3  26086.1997 + 26080.5565                26085.493 0.489 250.975 292.92  909.41  9.65 +         1090.00 1.476 1.357            cb/g sn104    780.00 0.000 1.410            m          2       72  14 100 2  26086.2014

Position Column Descriptions

Columns	Contents
1-5	Network name
7-14	Station name
18	Source of coordinates (see codes at end of file)
20-21	Latitude degrees (north positive)
26-31	Latitude minutes
23-24	Latitude seconds
34-37	Longitude degrees (east positive)
39-40	Longitude minutes
42-47	Longitude seconds
53	Source of elevation (see codes at end of file)
55-61	Elevation (m)
65-66	Type of center mark (see codes at end of file)
68-80	Information stamped on monument

Line Lengths Column Descriptions

Columns	Contents
1-5	Network name
7-14	Station 1 name
16-23	Station 2 name
25-26	Year (2-digit, always in 1900s)
27-28	Month
29-30	Day of month
32-35	Time (hhmm)
37-41	Azimuth (clockwise from north, decimal degrees)
43-53	Mark-to-mark distance (m)
55	Reduction code (+=latitude properly accounted for in pressure reduction, /=latitude was ignored)
56-66	Distance on Clarke spheriod (m)
68-74	Standard deviation (m)
76-80	Code ([blank]=geodolite, red=reduced [from an eccentric], g8=geodimeter)
Note: the casual user can ignore the remaining columns
83-91	Mean ranging (m)
93-97	Mean offset (m)
99-105	Mean index of refraction
107-112	Mean air temperature (degrees K)
114-120	Mean air pressure (mb)
122-126	Mean vapor pressure (mb)
128	Original reduction code ([blank] or $)
130-136	Correction to convert [blank] or $ to / (m)
138-144	Elevation of Station 1 (m)
146-150	Instrument constant (m)
152-156	Instrument Height 1 (m)
158-156	Instrument digiquartz #1 id
163-166	Instrument digiquartz #2 id
169-172	Instrument operator
163-166	Instrument id
182-188	Elevation of Station 2 (m)
190-194	Reflector constant (m)
196-200	Reflector Height 1 (m)
202-205	Reflector digiquartz #1 id
207-210	Reflector digiquartz #2 id
213-216	Reflector operator
218-223	Reflector id
224	Processing direction (1=Sta 1 to Sta 2, 2=Sta2 to Sta1)
226-229	Aircraft recorder id
231-233	Probe 1 id
235-237	Probe 2 id
239-241	Airspeed (knots)
242-243	Number of aircraft passes
245-255	Old arc distance using Bomford refractivity