Limitations of the position of GCPs

Dear Sir/Mam,

We have a project of survey of area approx 260 Sqr Kms. We are using Inspire 1. For better result, we need GCPs. So we need some informations from you those are following:

1) Minimum distance b/w two GCP points?

2) How should we put the GCPs in processing time?

3) When we process some images at a time for an area & there is no GCP within that range but we have taken far away from that area,then how should we import those GCPs in that processing area? 

We are waiting for your valuable suggestion.

Thanks & Regards,

Jaydeb

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