LAND SURVEY EXPERTS BD NO FURTHER A MYSTERY

Airplane surveying assumes the Earth is flat. Curvature and spheroidal shape from the Earth is neglected. In this sort of surveying all triangles formed by becoming a member of survey traces are considered as aircraft triangles.ভূমি রেকর্ড ও জরিপ অধিদপ্তরের নিয়োগবিধি - ১৯৮৪