VIA Technologies EPIA SN-Series Specifications download pdf (Page 49)

FASTER Planning Software

Chapter 5. FASTER Planning Software

5.1 Photogrammetric Aerial Mission

Purpose of a photogrammetric aerial mission is systematically cover a portion of the

Earth‟s surface. Flights are arranged in parallel strips allowing a sufficient overlap of

imaged areas, both in the across-track and along-track directions:

 Along-track direction, an overlap between 60 and 80% is generally selected,

so that an overlapping pair of photos may permit the location of any photo

point in at least two frames;

 Across-track direction, an overlap between 20 and 30% is selected because of

the need to build strong geometric interconnection between adjacent image

sequences;

Aerial campaigns typically require an accurate flight planning, whose general scheme is

presented in Figure 33 [Ref (21)]. In this scheme  is referred to the camera sensor size;

depending on how the camera is mounted may corresponds to the sensor base or height; 

is the projection of  on the ground, supposing a flat Earth.  is the flight height with

respect to the ground or another reference surface like WGS84 ellipsoid. Given ,  can

be found as follow:

=







Eq.1

where  is the lens focal length. Generally  is expressed with respect to the 35 mm

format but in most cases digital sensors have different size if the camera is not a full

frame camera. So Eq.1 becomes:

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VIA Technologies EPIA SN-Series Specifications Page 49