A map that follows the record

The problem

The earlier article map changed as a reader scrolled, but the change was easy to miss. The map could float over an essay's opening. Its title did not explain where the reader stood in the argument, and the evidence behind an active layer remained outside the reader's view.

That separation mattered. A boundary can describe a neighborhood before clearance, a demolition area, a highway route, a surviving institution, or an organizing victory. The map needs to say which record it shows.

What changed

Every major section now begins with a visible MapScene marker. The marker names the geographic claim before the prose develops it. The article reads as a complete narrative when JavaScript does not run, while the marker gives the interactive map a clear anchor when it does.

As a reader reaches a scene, the Atlas updates the active map view and layer set. The map header names the current scene and shows its place in the sequence. A section about a neighborhood before clearance does not leave a later highway layer on screen by accident.

The transition respects a reader's reduced-motion setting. On desktop, the map lives in a sticky evidence column beside the article. On mobile, it becomes a compact bottom sheet that readers can expand for the map or collapse for the text.

Evidence stays attached to the map

The active-evidence panel lists each visible layer with its label, date or period, and evidence state. Readers can open the source and precision note without leaving the page. Approximate and illustrative geometry receive different visual treatment from traced geometry.

The map also preserves the forms of the records it carries. Points, lines, and areas render as their own geographic forms. A church, a freeway route, and a clearance boundary should not pretend to be the same kind of evidence.

The result

The interaction now follows the essay's structure: community, clearance, replacement, survival, resistance, and the present landscape. The map does not stand apart as decoration. It stays with the record the reader is examining.

Read the methodology for the Atlas's wider standards for sources, maps, and editorial review.