5.6.1 Numerical-1 on scale of vertical photograph | CE303 |
UNIT 5 | SURVEYING
5.6.1 Numerical-1 on scale of vertical photograph
This extract discusses the process of calculating various scales for a vertical photograph in surveying based on given elevation points and flying height.
Key Points:
-Elevations for three points are provided: Hx, Hy, and Hz.
-Given elevations: Hx = 2000 meters, Hy = 1500 meters, Hz = 3000 meters.
-The flying height (H) above the datum is given as 5000 meters.
-The task is to determine the maximum and minimum scales as well as compute the average scale.
-The formula for the scale of a vertical photograph is introduced: Scale (k) = F / (H - h), where F is the focal length and h is the elevation of the ground point.
-The focal length (F) is given in millimeters (150 mm) and needs to be converted to meters by multiplying by 10 to the power of -3.
-Calculations for Scale x (Hx), Scale y (Hy), and Scale z (Hz) are to be performed using the respective elevation points and flying height (H).
Conclusions and Takeaways:
The provided content sets the stage for computing photographic scales in surveying using given elevations and flying height data.
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