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GATE (CE) : Transportation Engineering & Surveying #14
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The local means time at a place located in longitude 90 ° 40' E when the standard time is 6 hours and 30 minutes and the standard meridian is 82 ° 30' E is
Optimal flight planning for a photogrammetric survey should be carried out considering
A line AB appears to be 10.16 cm on a photograph for which the focal length is 15 cm. The corresponding line measures 2.54 cm on a map which is to a scale . The terrain has an average elevation of 300 m above MSL. The flying altitude of the aircraft above MSL when the photograph was taken
In a pair of overlapping photographs, the mean distance between two principal points both of which lie on the datum is 6.375 cm. at the time of photography, the air craft was 600 m above the datum. The camera has a focal length of 150 mm. in the common overlap a tall chimney 120 m high with its base in the datum surface is observed. Determine the difference of parallax for top and bottom of chimney.
A camera of focal length 25 cm is used to photograph an area on ground of 2.64 sqkm from a height of 500m. The length of the plate is 20 cm along the direction of flight and the width is 16 cm. If the longitudinal and lateral overlaps are required to be 8 cm and 6 cm respectively, find out the number of photographs required to cover the ground.
Assertion (A): Horizontal distance between two points on a vertical photograph can be calculated directly by measuring the distance on the photo and multiplying it with the scale.
Reason (R): Photo distance is the product of scale and ground distance.
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Oct 13ESE & GATE CE