- Asked 4/31
- 2076 Chaitra · 4 marks
Area by DMD, traverse ABCDE (+218)
Short answer
DMDs: 202, 484, 232, −401, −351 m; Σ(L×DMD) = −163938 m². Area = 81969.00 m² (8.1969 ha).
Calculate the area of the traverse by double meridian distance method.
| Line | AB | BC | CD | DE | EA |
|---|---|---|---|---|---|
| Latitude (m) | +218 | -277 | -109 | -207 | +375 |
| Departure (m) | +202 | +80 | -332 | -301 | +351 |
The traverse closes: ΣL = 0 and ΣD = 0.
DMD method
DMD rule (taking the meridian through the starting station):
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DMD of the first line = departure of the first line.
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DMD of any line = DMD of the previous line + departure of the previous line + departure of the line itself.
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DMD of the last line = departure of the last line with opposite sign (a check).
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Double area = Σ (latitude × DMD), and area = ½ |Σ L × DMD|.
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DMD(AB) = D(AB) = 202
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DMD(BC) = 202 + (202) + (80) = 484
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DMD(CD) = 484 + (80) + (-332) = 232
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DMD(DE) = 232 + (-332) + (-301) = -401
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DMD(EA) = -401 + (-301) + (351) = -351
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Check: DMD(EA) = -351 = −D(EA) = -351, so the DMDs are correct.
| Line | Latitude L (m) | Departure D (m) | DMD (m) | L × DMD (m²) |
|---|---|---|---|---|
| AB | 218 | 202 | 202 | 44036 |
| BC | -277 | 80 | 484 | -134068 |
| CD | -109 | -332 | 232 | -25288 |
| DE | -207 | -301 | -401 | 83007 |
| EA | 375 | 351 | -351 | -131625 |
| Sum | 0 | 0 | -163938 |
Answer: Area = 81969.00 m² (8.1969 ha).
✓ Answer checked by Claude Opus 5.5 (high effort)
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