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| #180 TRAV - Resolved - Incorrect angular error of closure | |
| BugNo | 180 |
| CodeModule | TRAV |
| Status | Resolved |
| Title | Incorrect angular error of closure |
| Description | Trav incorrectly calculates angular error of closure when the backsight bearing is in the NW, SE or SW quadrants. The example below contains correct results with the starting bearing in the NE quadrant. When you change the quadrant to NW, the angular error is variable, sometimes 670380 seconds. In the SE quadrant, the angular error is variable, sometimes 1296120 seconds. In the SW quadrant, the error is variable, sometimes 648120. Changing the backsight bearing or restarting Trav seems to trigger this behaviour. The only reliable quadrant is NE. |
| Comments |
The following correct results were generated by the New Trav module and have been confirmed using the old Trav program.
WARNING!!!!!!!! However, changing to a starting foresight of NW,SE or SW does not produce the correct angular error!!!!!! FIELD MEASUREMENTS START STATION: 1 1000.00 1000.00 0.00 N 86 54 30 E STATION HOR. ANGLE VER. ANGLE DISTANCE H.I R.H 1 90 36 30 90 00 00 280.200 0.0 0.0 2 70 08 00 90 00 00 294.540 0.0 0.0 3 113 02 00 90 00 00 183.600 0.0 0.0 4 86 15 30 90 00 00 286.920 0.0 0.0 END STATION: 1 1000.00 1000.00 0.00 N 86 54 30 E WITH RAW FIELD ANGLES: ERROR OF CLOSURE = 1 IN 2512.309 DIRECTION OF ERROR = S 33 59 54 W 0.416 TOTAL LENGTH = 1045.26 FEET AANGULAR ERROR = -120.00 SECONDS IN 4 ANGLES ADJUSTMENT = -30.00 SECONDS PER ANGLE WITH BALANCED ANGLES: ERROR OF CLOSURE = 1 IN 3365.322 DIRECTION OF ERROR = N 33 05 59 E 0.311 TOTAL LENGTH = 1045.26 FEET TRAVERSE ADJUSTMENT - UNAJUSTED DATA, BALANCED ANGLES STA BRG/AZM(S) DISTANCE N. COORD E. COORD ELEV 1 = B.S. N 86 54 30 E 1 1000.000 1000.000 0.00 2 N 2 29 30 W 280.200 1279.935 987.819 0.00 3 S 67 38 00 W 294.540 1167.853 715.438 0.00 4 S 0 39 30 W 183.600 984.265 713.328 0.00 N 86 54 30 E 286.920 1 COMPUTED POSITION = 999.740 999.830 0.00 1 TRUE POSITION = 1000.000 1000.000 0.00 TRAVERSE ADJUSTMENT - COMPASS RULE, BALANCED ANGLES STA BRG/AZM(S) DISTANCE N. COORD E. COORD ELEV 1 = B.S. N 86 54 30 E 1 1000.000 1000.000 0.00 2 N 2 28 54 W 280.268 1280.005 987.864 0.00 3 S 67 38 35 W 294.468 1167.996 715.531 0.00 4 S 0 38 57 W 183.554 984.454 713.451 0.00 N 86 53 41 E 286.970 1 COMPUTED POSITION = 1000.000 1000.000 0.00 1 TRUE POSITION = 1000.000 1000.000 0.00 TRAVERSE ADJUSTMENT - TRANSIT RULE, BALANCED ANGLES STA BRG/AZM(S) DISTANCE N. COORD E. COORD ELEV 1 = B.S. N 86 54 30 E 1 1000.000 1000.000 0.00 2 N 2 29 23 W 280.323 1280.058 987.822 0.00 3 S 67 38 10 W 294.447 1168.026 715.522 0.00 4 S 0 39 30 W 183.519 984.519 713.413 0.00 N 86 54 28 E 287.005 1 COMPUTED POSITION = 1000.000 1000.000 0.00 1 TRUE POSITION = 1000.000 1000.000 0.00 TRAVERSE ADJUSTMENT - CRANDALL RULE, BALANCED ANGLES STA BRG/AZM(S) DISTANCE N. COORD E. COORD ELEV 1 = B.S. N 86 54 30 E 1 1000.000 1000.000 0.00 2 N 2 29 30 W 280.328 1280.063 987.813 0.00 3 S 67 38 00 W 294.428 1168.023 715.536 0.00 4 S 0 39 30 W 183.514 984.522 713.427 0.00 N 86 54 30 E 286.990 1 COMPUTED POSITION = 1000.000 1000.000 0.00 1 TRUE POSITION = 1000.000 1000.000 0.00 |
| FiledBy | set |
| FiledDate | 04/16/2000 |
| ResolvedDate | 04/17/2000 |
| Resolution | - |
| VersionNo | 4.17 |