Charlotte Sectional Explorer

What this build does and does not answer

The independently reviewed MSL-floored Class B shelves are resolved, including the exact-floor case: the FAA Chart Users' Guide states that a Class B floor extending “upward from above” an altitude carries a (+) and that operations at and below it are outside the Class B. Charlotte's legal description says “extending upward from 1,800 feet MSL” with no such marking, so at exactly 1,800 you are inside.

Terrain is carried as a per-cell ground band — the lowest and highest USGS 3DEP elevation inside each grid cell, aggregated from native one-third arc-second pixels, never a single averaged value. A floor published above the ground (a 700 or 1,200 ft AGL Class E floor, or SFC, which means the local surface and not 0 ft MSL) is resolved only when your altitude is decisive against both bounds: above the floor implied by the highest ground, or below the one implied by the lowest. Between the two the answer is withheld as not evaluatedrather than anchored to one terrain value that could misplace the floor by hundreds of feet. The four part-time surface areas in this extract — Concord, Hickory, Winston-Salem and Albemarle — carry independently reviewed schedule records tied to this edition's Chart Supplement AIRSPACE entries (with the one-hour daylight-saving shift the supplement's dagger denotes), so the evaluation time decides whether each tower's Class D is in effect. Honest gaps remain gaps: Albemarle can also be activated by NOTAM outside its hours, and NOTAMs are not carried, so it is never reported inactive. Equipment rules, TFRs, special-use airspace, obstacles and MEF quadrants are not evaluated at all.

Chart imagery is public-domain FAA raster, reprojected and tiled from a single pinned 56-day edition whose source checksum and render identity are both recorded. Educational use only — not for navigation. Verify everything against current official publications before you fly.