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
Geodolite Line Lengths
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 |
