Question

How many GCPs will be required for spatial interpolation of different images using 3rd order polynomial function?
(a.) 6
(b.) 10
(c.) 3
(d.) 4

Answer 1

For third-order polynomial function, the number of GCP is 10.

Explanation:

• 10 ground control panels are required for spatial interpolation of different images using 3rd order polynomial function.
• GCP is used as a georeference set located on the earth's surface.
• It is used in polynomial transformation order and its number depends on the geo-referencing order of transformation.
• Its general formula is ( t +1 ) (t + 2 ) / 2
• Therefore for third-order polynomial function, the number of GCP is 10.