The sketch in CAMA is compared to what’s visible on the ground by either rotating and anchoring the sketch vectors footprint over the outline of a structure on aerial photography or visually comparing the jpeg of the structure to what’s visible on aerial photography.
Typically 10% of the sketches won’t match to some degree as a result of improvements built without a permit, sketch program conversion errors, or mistakes made measuring an improvement years earlier.
Depends on what approach you take and whether the work is done in-house or out-sourced. For a project that’s out-sourced expect to pay 60-75 cents per sketch plus a set-up fee and seat licenses to review and edit. For a project that’s done in-house, expect to pay 50 cents/parcel.
It can be. Sketch Validation, LLC offers both. The cost to do work stateside typically costs 6 cents per sketch more than work done overseas.