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A land surveyor in Tanzania was assigned tasks to prepare a map for a proposed road construction project in rural areas. Explain the methods used in plotting a compass traverse and draw how each method help in obtaining accurate field results.
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Haya, nitajibu swali la 2a na 2b.
a) Eleza jinsi makosa ya kufunga (closing errors) yanavyotokea katika upimaji wa traverse.
Makosa ya kufunga hutokea katika upimaji wa traverse wakati traverse iliyofungwa (closed traverse) haifungi kikamilifu kwenye sehemu yake ya kuanzia, au wakati traverse iliyounganishwa (open traverse) haifiki kikamilifu kwenye sehemu inayojulikana. Hii hutokea kutokana na makosa madogo madogo yanayojikusanya katika vipimo vya pembe na umbali wakati wa upimaji. Makosa haya yanaweza kusababishwa na usahihi mdogo wa vifaa, makosa ya kibinadamu katika kusoma vipimo, au mabadiliko ya hali ya hewa yanayoathiri vifaa.
b) Kwa kutumia kanuni ya Bowditch, eleza utaratibu unaotumika kurekebisha makosa hayo.
Kanuni ya Bowditch hutumika kusambaza makosa ya kufunga sawasawa katika traverse. Utaratibu ni kama ifuatavyo:
- Hesabu makosa ya kufunga: Kwanza, hesabu makosa ya kufunga katika latitudo () na longitudo ().
- Hesabu jumla ya urefu wa traverse: Pata jumla ya urefu wa pande zote za traverse ().
- Rekebisha latitudo na longitudo: Tumia fomula zifuatazo kurekebisha latitudo na longitudo ya kila upande wa traverse:
- Marekebisho ya latitudo ya upande wowote :
- Marekebisho ya longitudo ya upande wowote :
- Hesabu kuratibu zilizorekebishwa: Ongeza marekebisho haya kwenye latitudo na longitudo za awali za kila upande ili kupata kuratibu zilizorekebishwa. Hii inahakikisha kwamba traverse inafunga kikamilifu.
Hivyo, kanuni ya Bowditch inasambaza makosa kwa uwiano wa urefu wa kila upande wa traverse.
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