Photographic "Footprints", definitions thereof |
Photographic "Footprints", definitions thereof |
Jun 28 2017, 02:07 AM
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#1
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Junior Member Group: Members Posts: 91 Joined: 21-August 06 Member No.: 1063 |
Concerning the definition of a "footprint"
Say a spacecraft flying overhead of planet is pointing its camera rectangular shaped FOV down at the surface. If 1 or more of the 4 corner boundary rays stops intercepting with the surface, is the area under the FOV still considered a "footprint"? Perhaps it only matters if the borsight ray of the FOV intercepts with the planet to qualify as a "footprint" ? I tend to think all of those 4 cornors rays would have to be intecepting the surface to qualify as a "footprint" but I just wanted some clarification maybe from an expert. Thank you. |
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Jun 28 2017, 07:57 PM
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#2
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Senior Member Group: Members Posts: 2511 Joined: 13-September 05 Member No.: 497 |
If 1 or more of the 4 corner boundary rays stops intercepting with the surface, is the area under the FOV still considered a "footprint"? If an image contains the entire target planet, then none of the four corners intersect the planet, and if the planet were off-center, the boresight might not intersect the planet either, but the footprint would still be the entire visible part of the planet. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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