FAQ

What is the Field of View (FOV) and where can I find it?

In general, the Field Of View (FOV) describes the opening angle of a camera's optic. The opening angle and the camera's altitude above the ground (distance between camera and object) determine the size of the imaged area (swath width).

For IRS cameras, the cross track FOV can be found in the Super Structure Format or on the pages describing the IRS-1C, IRS-1D and IRS-P6 cameras. The cross track Field Of View in radiant for one pixel is given.

p =     tan(FOV) * a
s = n * tan(FOV) * a

where: a   - camera's altitude above ground (m)
       FOV - cross track Field Of View
       p   - size of a pixel cross track (m)
       s   - swath width (m)

E.g. for IRS-1C LISS-III this is:

p = tan(0.0000288) * 817000 m
p = 23.5 m


s = 6000 * tan(0.0000288) * 817000 m
s = 141177 m
s = 141 km