Calculate the maximum offset value ΔΖmax of an extrusion or intrusion detail from a reference plane (mainly flat object) so that the maximum error on the image plane due to radial shift does not exceed a certain limit Δρmax. (optical axis perpendicular to object plane)
1. From the geometry of the scene applies:
where mb is the image scale (constant for a flat object face parallel to image plane).
From these equations, it follows that Δρ value is proportionate to ρ– as well as to ΔΖ. Thus, for a given ρ– value, radial error Δρ reaches its unfavorable value when ΔΖ=ΔΖmax , that is along the limits of the image.
2. Given the previous equation, for Δρmax:
concluding that, in order to maintain an orthoimage's accuracy inside the limits of the default graphical accuracy, the object must not reveal extruded or intruded faces larger than 12 cm.
Given the rate and direction of full dip of a pla...