Which formula is used to calculate relief displacement in aerial photography?

The formula used to calculate relief displacement in aerial photography is accurately expressed as d = rh / H. In this formula:

• d represents the relief displacement, which is the apparent shift of points on the ground in a photograph due to differences in elevation.

• r denotes the distance from the principal point of the photograph to the point being analyzed.

• h is the height of the feature above the datum level, typically the mean sea level.

• H refers to the altitude of the camera above the datum level at which the photograph was taken.

This relationship is crucial in aerial photography as it helps surveyors and photogrammetrists interpret and quantify how elevation changes can affect the appearance of features in images. The formula showcases the direct proportionality between relief displacement and both the height of the feature and the distance from the camera, providing valuable insights into how terrain variations will impact photographic interpretations.

By understanding this formula, surveyors can apply it to adjust measurements and accurate assessments in their work, leading to more precise mapping and analysis of the landscape.