RustyBug Offline Upload & Sell: On
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Mount the camera on a tripod. Mark the location of the tripod feet precisely (as possible). Or better still, place the tripod feet in a static reference point (concrete joint, paint line, etc. @ urban). Create your own ref points (or physical block) with three nails in the dirt, etc. They can be driven "below grade" and nobody will know they are there but you.
Leave the camera mounted (no changes in registration) on the tripod during the non-shooting interval. Replace tripod to same position.
Ideally, you wouldn't even fold or retract your tripod legs, but as long as you can do so repeatably @ full extension, solid, secure locking points, etc. you should be in pretty good shape to maintain registration of the scene between shots. Cross-checking your distances/angles image/scene ref points is of course viable, but if all three feet are set in the same spot, triangulation should put you looking in the exact (theoretically speaking) same position without the need for any measurements.
The fewer variables you contend with, the better your ability to replicate registration. Leaving the camera mounted to the tripod mitigates leveling, sliding, rotating or tilt angles imposed in an effort to reposition the same. Just don't move the position and there is no need to attempt a "re-position".
If it is a "secure" location, you could just leave the tripod in place ... but I suspect that isn't going to be the case.
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