A tiled optical scan covers repeated fields of view. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

One optical field covers the image length

One calibrated field covers 12 m.

Lfield=12 mL_{\text{field}}=12\ \text{m}
Pixel mappingMagnification and pixels bind image length to addresses.sampleimagecovered3 m12 m4 fields -> 48 m

Tiled fields multiply covered length

With 4 non-overlapping fields, the covered length is 48 m. No stitching or segmentation is claimed.

Lcovered=4Lfield=48 mL_{\text{covered}}=4L_{\text{field}}=48\ \text{m}
Pixel mappingMagnification and pixels bind image length to addresses.sampleimagecovered3 m12 m4 fields -> 48 m