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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.

LineABBCCDDEEA
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):

  • DMD of the first line = departure of the first line.

  • DMD of any line = DMD of the previous line + departure of the previous line + departure of the line itself.

  • DMD of the last line = departure of the last line with opposite sign (a check).

  • Double area = Σ (latitude × DMD), and area = ½ |Σ L × DMD|.

  • DMD(AB) = D(AB) = 202

  • DMD(BC) = 202 + (202) + (80) = 484

  • DMD(CD) = 484 + (80) + (-332) = 232

  • DMD(DE) = 232 + (-332) + (-301) = -401

  • DMD(EA) = -401 + (-301) + (351) = -351

  • Check: DMD(EA) = -351 = −D(EA) = -351, so the DMDs are correct.

LineLatitude L (m)Departure D (m)DMD (m)L × DMD (m²)
AB21820220244036
BC-27780484-134068
CD-109-332232-25288
DE-207-301-40183007
EA375351-351-131625
Sum00-163938
Area=∣−163938∣2=81969 m2\text{Area} = \frac{|-163938|}{2} = 81969\ \text{m}^2

Answer: Area = 81969.00 m² (8.1969 ha).

✓ Answer checked by Claude Opus 5.5 (high effort)

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