Figure 1-10. Comparison of IR with Photograph.
8. IR mensurations. The scaling and measurements of IR imagery are similar to vertical
photography, using the formula ground distance (GD) = photo distance (PD) x denominator of
the photo representative fraction (DPRF). Refer to subcourse IT 0644, Vertical
Photogrammetry, for additional studies.
Due to the scan technique and the emissivity factor of different objects on the
ground, the measurement will not be 100 percent accurate.
1. Three different air reconnaissance request formats are used by US forces for IR R&S
2. Joint Tactical Air R&S Request Form (Figure 1-11) is used by mission requesters.
Specific information as to how to complete this form can be obtained by consulting IT 0661,